Segments sentence example

segments
  • As many as 162 segments in eight groups are practically used.
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  • The segments of each ch~omosome are usually twisted upon.
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  • The ninth and tenth segments are at most times retracted within the eighth.
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  • With very few exceptions, the larva in this group is active and campodeiform, with cerci and elongate legs as in the Adephaga, but the leg has only four segments and one claw.
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  • Paired processes on the eighth and ninth abdominal segments may be specialized as external organs of reproduction, but these are probably not appendages.
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  • 2 i) with two or four segments.
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  • In this condensa segments.
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  • The maxillary palps have usually three, the labial either two or four segments.
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  • The palps, both maxillary and labial, have two segments.
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  • Q, Three segments of a pitted vessel of Phanerogam.
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  • For instance, the difference between the long-stalked and finely-cut leaves of Anemone attacked with rust and the normal leaves with broad segments, or between the urceolate leaves occasionally found on cabbages and the ordinary formin these cases undoubtedly pathological and teratological respectivelyis nothing like so great as between the upper and lower normalleaves of many Umhelliferae or the submerged and floating leaves of an aquatic Ranunculus or Cabomba.
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  • The reduction is brought about simply by the segmentation of the spirem thread into half the number of segments instead of the normal number.
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  • cambricum (originally found in Wales) has the pinnae themselves deeply cut into narrow segments; var.
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  • 2 b, 9b and 26 b, c); the number of segments is usually eleven, but may vary from two to more than twenty.
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  • In a large number of beetles of different families, stridulating areas occur on various segments of the abdomen, and are scraped by the elytra.
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  • Such obvious features as the number of segments in the foot and the shape of the feeler were used by the early entomologists for distinguishing the great groups of beetles.
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  • The arrangement dependent on the number of tarsal segments - the order being divided into tribes Pentamera, Tetramera, Heteromera and Trimera - was suggested by E.
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  • Ganglbauer (1892) divides the whole order into two sub-orders only, the Caraboidea (the Adephaga of Sharp and the older writers) and the Cantharidoidea (including all other beetles), since the larvae of Caraboidea have five-segmented, two-clawed legs, while those of all other beetles have legs with four segments and a single claw.
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  • 2) are Adephaga highly specialized for life in the water, the hind-legs having the segments short, broad and fringed, so as to be well adapted for swimming, and the feet without claws.
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  • mandibles being well adapted for the capture of small insect-victims. The larvae are more specialized than those of other Adephaga, the head and prothorax being very large and broad, the succeeding segments slender and incompletely chitinized.
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  • The number of antennal segments varies from eleven to two.
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  • These segments are very mobile, and as the rove-beetles run along they often curl the abdomen upwards and forwards like the tail of a scorpion.
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  • This is a somewhat heterogeneous group, most of whose members are characterized by clubbed feelers and simple, unbroadened tarsal segments - usually five on each foot - but in some familie andenera the males have less than the normal number on the feet of one pair.
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  • The bestknown family is the Hydrophilidae, in which the feelers are short with less than eleven segments and the maxillary palpi very long.
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  • side, being scooped in bubbles by the terminal segments of the feelers when the insect rises to the surface.
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  • The female is a segmented, wormlike creature, spending her whole life within the body of the bee, wasp or bug on which she is parasitic. One end of her body protrudes from between two of the abdominal segments of the host; it has been a subject of dispute whether this protruded end is the head or the tail, but there can be little doubt that it is the latter.
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  • I and 25) have the terminal antennal segments pectinate, and so arranged that the comb-like part of the feeler cannot be curled up, while the elytra completely cover the abdomen.
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  • The Passalidae are a tropical family of beetles generally considered to be intermediate between stag-beetles and chafers, the enlarged segments of the feeler being capable of close approximation.
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  • 26, b, c) can be brought close together so as to form a club-like termination; usually the hinder abdominal segments are not covered by the elytra.
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  • In this family there is often a marked divergence between the sexes; the terminal antennal segments are larger in the male than in the female, and the males may carry large spinous processes on the head or prothorax, or both.
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  • The larvae have the three pairs of legs well developed, and the hinder abdominal segments swollen.
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  • - The families of beetles included by Kolbe in this group are distinguished by the possession of six malpighian tubes, and a great reduction in one or two of the tarsal segments, so that there seem to be only four or three segments in each foot; hence the names Tetramera and Trimera formerly applied to them.
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  • The larvae have soft-skinned bodies sometimes protected by rows of spiny tubercles, the legs being fairly developed in some families and greatly segments to the foot, but there are really five, the fourth being greatly reduced.
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  • The mandibles are strong, adapted for biting the vegetable substances on which these beetles feed, and the palps of the second maxillae have three segments.
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  • The most active form of larva found in this family resembles in shape that of a ladybird, tapering towards the tail end, and having the trunk segments protected by small firm sclerites.
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  • They have eleven segments to the feeler, which is clubbed at the tip, and apparently three segments only in each foot.
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  • The foot has apparently four segments, .as in the Chrysomelidae.
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  • 39) have jointed, flexible palps, feelers - often of excessive length - with a short basal segment, and the three terminal segments forming a club, and, in some genera, larvae with legs.
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  • 9 in.; this he lined with cast-iron segments bolted together, giving a sr 2 / FIG.
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  • border of North Carolina's Appalachian Mountain Region, which includes the high Unaka Mountain Range, segments of which are known by such local names as Iron Mountains, Bald Mountains and Great Smoky Mountains.
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  • The head of an ant carries a pair of elbowed feelers, each consisting of a minute basal and an elongate second segment, forming the stalk or "scape," while from eight to eleven short segments make up the terminal "flagellum."
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  • These segments are abundantly supplied with elongate tooth-like projections connected with nerve-endings probably olfactory in function.
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  • The peculiar form and arrangement of the anterior abdominal segments have already been described.
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  • For the appreciation of the sounds made by these stridulators, the ants are furnished with delicate organs of hearing (chordotonal organs) in the head, in the three thoracic and two of the abdominal segments and in the shins of the legs.
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  • The hinder abdominal segments and the stings of the queens and workers resemble those of other stinging Hymenoptera.
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  • Fielde show that an ant follows her own old track by a scent exercised by the tenth segment of the feeler, recognizes other inmates of her nest by a sense of smell resident in the eleventh segment, is guided to the eggs, maggots and pupae, which she has to tend, by sensation through the eighth and ninth segments, and appreciates the general smell of the nest itself by means of organs in the twelfth segment.
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  • The conformation of those flowers a consists essentially in the pres- ' 'A B ence of a six-parted perianth, the three outer segments of which correspond to a calyx, the three inner ones to a corolla.
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  • These segments spring apparently from the top of the ovary - the real explanation, however, being that the end of the flower-stalk or "thalamus," as it grows, becomes dilated into a sort of cup or tube enclosing and indeed closely adhering to the ovary, so that the latter organ appears to be beneath the perianth instead of above it as in a lily, an appearance which has given origin to the term "inferior ovary."
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  • The setae are implanted metamerically in accordance with the metamerism of the body, which consists of a prostomium followed by a number of segments.
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  • The number of segments in an individual is frequently more or less definite.
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  • The body consists of a number of exactly similar or closely similar segments, which are never fused and metamorphosed, as in the Arthropoda, to form specialized regions of the body.
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  • to two segments, t.s, Trunk segment.
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  • In any case the cavity of the prostomium is single, and not formed, as is the cavity of the segments of the body, by paired coelomic chambers.
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  • Kleinenberg), in which case there is more reason for favouring the view that would assign an equality between the prostomium and the (in that case) other segments of the body.
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  • The successive cavities are not, however, completely closed from each other; there is some communication between adjoining segments, and the septa are sometimes deficient here and there.
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  • Ray Lankester to the members of a series of tubes, proved in some cases to be excretory in nature, which exist typically to the number of a single pair in most of the segments of the Chaetopod body, and open each by a ciliated orifice into the coelom on the one hand, and by a pore on to the exterior of the body on the other.
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  • D, Optical section of a branch of organs are present to the number of a single pair per somite, and are commonly present in the majority of the segments of the body, failing often among the Oligochaeta in a varying number of the anterior segments.
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  • oviducts of Oligochaeta, sperm ducts of Phreoryctes, the coelomoducts occupy, like the nephridia, two segments, the funnel opening into that in front of the segment which carries the external pore.
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  • In Lumbricus the connexion is a little closer; the funnel of the nephridium, in the segments in which the funnels of the gonad ducts are to be developed, persists and is continuous with the gonad duct funnels on their first appearance.
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  • Beddard) the funnels of the pronephridia disappear except in the genital segments, where they seem to be actually converted into the genital funnels.
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  • In the genital segments of Eudrilus the nephridia are present, but the funnels have not been found though they are obvious in other segments.
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  • But the funnel is large and thus differs from the funnels of the nephridia in adjoining segments.
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  • The prostomium and the segments generally often bear processes sensory and branchial.
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  • In Chaetozone setosa the anterior nephridia occupy five segments.
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  • There is usually a gap between the two series, several segments being without nephridia.
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  • In Syllis there is also a "Heterosyllid" form in which the gonads are limited to a posterior region of the body which is further marked off from the anterior non-sexual segments by the oak-like setae.
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  • Segments worms, to illustrate external characters.
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  • of body numerous and not A, B, C, anterior segments from the distinctive of species, being ventral surface; D, hinder end of body irregular and not fixed in of Urochaeta.
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  • segments are the apertures of the Nervous system rarely atria.C, Perichaeta: the spermathecal pores (Aeolosoma) in continuity are between segments 6 and 7, 7 with epidermis.
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  • Several specially large contractile trunks in the anterior segments uniting the dorsal and ventral vessels.
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  • anterior segments of the body, and have completely disappeared in Achaeta cameranoi.
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  • It is therefore obviously much thicker than the clitellum in the limicolous forms. The position of the clitellum, which is universal in occurrence, varies much as does the number of component segments.
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  • The external segments are usually definable by the setae; and if the setae are absent, as in the anterior segments a, Penial seta of Perichaeta ceylonica.
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  • - Diagrams of various Earth of several Geoscolicidae, the nephridiopores indicate the segments; to each segment corresponds internally a chamber of the coelom which is separated from adjacent segments by transverse septa,which are only unrecognizable in the genus Aeolosoma and in the head region of other Oligochaeta.
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  • On the other hand, in most Oligochaeta the first segment has in the adult no nephridium, and in the case of Octochaetus the existence of a "head kidney" antedating the subsequently developed nephridia of the first and other segments has neither been seen nor proved to be absent.
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  • In any case the nephridia which occupy the segments of the body generally are first of all represented by paired structures, the "pronephridia," in which the funnel is composed of but one cell, which is flagellate.
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  • The Oligochaeta contrast with the Polychaeta in the general presence of outgrowths of the septa in the genital segments, which are either close to, or actually involve, the gonads, and into which may also open the funnels of the gonad ducts.
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  • The spermathecae are usually paired structures, one pair to each of the segments where they occur.
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  • In many Geoscolicidae, however, and certain Lumbricidae and Perichaetidae, there are several, even a large number, of pairs of very small spermathecae to each of the segments which contain them.
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  • - XI-XIV,eleventh to fourteenth segments.
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  • and fourteenth segments.
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  • There are three pairs of spermathecae situated in segments III-V, a testis in V and an ovary in VI.
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  • They are small to moderatesized Oligochaeta, with a smaller number of segments than in the Terricolae.
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  • Nerve cord lies in coelom; brain in first segment or prostomium in many forms. Clitellum generally only two or three segments and more anterior in position than in Terricolae.
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  • Spermatheca rarely with diverticula; sperm ducts as a rule occupying two segments only, usually opening by means of an atrium.
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  • Sperm sacs generally occupying a good many segments and with simple interior undivided by a network of trabeculae.
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  • Vascular system complicated without regular connexion between dorsal and ventral vessels, except in anterior segments.
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  • Sperm sacs generally limited to one or two segments with interior subdivided by trabeculae.
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  • Sperm ducts traverse several segments on their way to exterior.
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  • The body is composed of a small and limited number of segments (not more than fourteen), and there is a sucker at each end of the body.
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  • There are no setae and apparently only two pairs of nephridia, of which the anterior pair open commonly by a common pore on the third segment after the head, whose segments have not been accurately enumerated.
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  • The intervening segments contain the genitalia, which are on the Oligochaeta plan in that the gonads are independent of their ducts and that there are special spermathecae, one pair.
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  • The segments of body are few (not more than thirty-four) and fixed in number.
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  • The absence of setae and the great secondary annulation render the mapping of the segments a subject of some difficulty.
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  • So that a leech in which only twenty-seven segments are apparent by the enumeration of the annuli, separate ganglia, nephridia, lines of sensillae upon the body, really possesses an additional seven lying behind that which is apparently the last of the series and crowded together into a minute space.
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  • The annuli into which segments are externally divided are so deeply incised as to render it impossible to distinguish, as can be readily done in the Oligochaeta as a rule, the limits of an annulus from that of a true segment.
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  • The reason for this excessive annulation has been seen in the limited number of segments (thirty-four) of which the body is composed, which are laid down early and do not increase.
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  • In the Oligochaeta, on the other hand, there is growth of new segments.
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  • Slight differences in form have been noted between nephridia of different segments; but the Hirudinea do not show the marked differentiation that is to be seen in some other Chaetopods; nor do the nephridia ever acquire any relations to the alimentary canal.
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  • Paired setae of Oligochaetous pattern present in anterior segments.
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  • A true insect, or member of the class Hexapoda, may be known by the grouping of its body-segments in three distinct regions - a head, a thorax and an abdomen - each of which consists of a definite number of segments.
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  • The thorax is composed of three segments; each bears a pair of jointed legs, and in the vast majority of insects the two hindmost bear each a pair of wings.
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  • Specially characteristic of the class, however, is the presence of a complex system of air-tubes (tracheae) for respiration, usually opening to the exterior by a series of paired spiracles on certain of the body segments.
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  • In their simpler condition they are long and many-jointed, the segments bearing numerous olfactory and tactile nerve-endings.
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  • Elaboration in the form of the feelers, often a secondary sexual character in male insects, may result from a distal broadening of the segments, so that the appendage becomes serrate, or from the development of processes bearing sensory organs, so that the structure is pinnate or feather-like.
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  • On the other hand, the number of segments may be reduced, certain of them often becoming highly modified in form.
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  • These have been interpreted as indicating one or more primitive segments between the head and thorax.
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  • Verhoeff (1904) that the hexapodan thorax in reality contains six primitive segments is entirely without embryological support.
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  • In most insects the leg is built up of nine segments: (1) a broad triangular, sub-globular, conical or cylindrical haunch (coxa); (2) a small trochanter; (3) an elongate stout thigh (femur); (4) a more slender shin (tibia); and (5-9) a foot consisting of five tarsal segments.
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  • segments separated.
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  • I, Fore-leg and pro-sternum (S) ta, Tarsal segments.
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  • In the relative development and shape of the various segments of the leg there is almost endless variety, dependent on the order to which the insect belongs, and the special function - walking, running, climbing, digging or swimming - for which the limb is adapted.
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  • In the abdominal exoskeleton the segmental structure is very clearly marked, a series of sclerites - dorsal terga and abdominal sterna - being connected by pale, feebly chitinized cuticle, so that considerable freedom of movement between the segments is possible.
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  • The female genital opening usually lies between the seventh and eighth segments, the male on the ninth.
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  • A marked modification of the hinder abdominal segments may be noticed in most insects, achynematus).
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  • In the higher orders several of the hinder segments may be altogether suppressed.
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  • - Outline of Male (a') and Female (?) Cockroaches (Blatta) from the side, showing Abdominal Segments (numbered I-b).
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  • 8), and as many as eight distinct pairs of abdominal ganglia may often be distinguished, the hindmost of which represents the fused ganglia of the last four segments.
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  • An ear of another type is found in the swollen second segment of the feeler in many male gnats and midges, the cuticle between this segment and the third forming an annular drum which is connected with numerous nerveendings, while the fine bristles on the more distal segments vibrate in response to the note produced by the humming of the female.
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  • In Hemiptera only eleven and in Collembola only yolk, and that the mesenteric epithelium becomes reinforced by six abdominal segments have been detected.
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  • Escherich (1901), after a new of these twenty-one divisions are so different from the others that research on the embryology of the muscid Diptera, claims that the they can scarcely be considered true segments.
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  • three segments and the procephalic or prae-oral lobes.
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  • Heider has suggested, however, that the apparent origin six segments.
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  • - A remarkable feature in the embryonic segments of the mandibles and of the first and second maxillae.
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  • Comstock and C. Kochi believe that the labrum belongs to it,, The appendages of the posterior three or trophal segments become the parts of the mouth.
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  • The appendages of the two maxillary segments arise as treble instead of single projections, thus differing from other appendages.
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  • From these facts it appears that the anterior three divisions of the head differ strongly from the posterior three, which greatly resemble thoracic segments; hence it has been thought possible that the anterior divisions may represent a primitive head, to which three segments and their leg-like appendages were subsequently added to form the head as it now exists.
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  • or " vertex," the compound eyes and the front divisions of the genae are formed by the cephalic lobes of the embryo (belonging membrane analogous to the amnion of higher Vertebrates andto the ocular segment), while the mandibular and maxillary segments known by the same term.
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  • Heymons considers that it represents the sternites of the three trophal segments, and that the gula is merely a secondary development.
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  • Though the T hx, thoracic segments bear the wings, no trace of these appendages exists till the close of the embryonic life, 8 `' nor even, in many cases, till much later.
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  • The thoracic segments, as seen in an early stage of the ventral plate, display in a well-marked manner the essential elements of the insect segment.
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  • s Abdominal Segments and i Appendages.
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  • Moreover, in this order the abdomen shows at first a division into only nine segments and a terminal mass, which last subsequently becomes divided into two.
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  • The cerci, when present, appear in the mature insect to be attached to the tenth segment, but according to Heymons they are really appendages of the eleventh segment, their connexion with the tenth being secondary and the result of considerable changes that take place in the terminal segments.
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  • The genital armature of the male is formed to a considerable extent by modifications of the segments themselves.
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  • In the embryos of many insects there are projections from the segments of the abdomen similar, to a considerable extent, to the rudimentary thoracic legs.
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  • The nervous system of the embryonic head exhibits three ganglionic masses, anterior to the thoracic ganglionic masses; these three masses subsequently amalgamate and form the sub-oesophageal ganglion, which supplies the trophal segments.
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  • There are other ganglia in addition to those of the ventral chain, and Janet supposes that the ganglia of the sympathetic system indicate the existence of three anterior head-segments; the remains of the segments themselves are, in accordance with this view, to be sought in the XIII.
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  • The segments are numbered 1-21; 1-6 will form the head, 7-9 the thorax, 10-21 the abdomen.
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  • 22) of the two hinder thoracic segments and are visible externally throughout the life-history, becoming larger after each moult or casting of the cuticle.
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  • I., II., III., vomitories) the imaginal disks are to all the three thoracic segments appearance completely separated from of the larva; I, 2, 3, buds the hypodermis, with which they are, of the legs of the imago; la, however, really organically connected bud of head-lobes; f, of by strings or pedicels.
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  • Thysanura (Bristle-tails): with ten abdominal segments; number of abdominal appendages variable.
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  • Collembola (Spring-tails): with six abdominal segments; appendages of the first forming an adherent ventral tube, those of the third a minute " catch," those of the fourth (fused basally) a " spring."
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  • A remarkable fossil from the Scottish Coal-measures (Lithomantis) had apparently small wing-like structures on the prothorax, and in allied genera small veined outgrowths - like tracheal gills - occurred on the abdominal segments.
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  • Insect wings are specialized outgrowths of certain thoracic segments, and are quite unrepresented in any other class of Arthropods.
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  • Mackerel, like all fishes of this family, have a firm flesh; that is, the muscles of the several segments are interlaced, and receive a greater supply of blood-vessels and nerves than in other fishes.
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  • Generally from to 24 gores and two small segments for the polar regions printed on vellum paper are used for each globe.
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  • He published in 1507 a huge map of the world, in 12 sheets, together with a small globe of a diameter of I 10 mm., the segments for which were printed from wood-blocks.
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  • Leonardo da Vinci's rough map of the world in 8 segments (c. 1513) seems likewise to have been intended for a globe.
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  • Of SchOner we know that he produced four globes, three printed from segments (1515, 1523, 1 533), and p SCF12MER.S FIG.
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  • There are three distinct and large thoracic segments, whereof the prothorax is narrower than the others; the legs are much shorter and stouter than in the winged insect, with monomerous tarsi terminated by a single claw.
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  • Respiration is effected by means of external gills placed along both sides of the dorsum of the abdomen and hinder segments of the thorax.
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  • The dorsal skeletal elements of the thorax and of the anterior six abdominal segments unite with the wing-cases to form a large respiratory chamber, containing five pairs of tracheal gills, with lateral slits for the inflow and a posterior orifice for the outflow of water.
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  • Of these divisions of the coelom the first two communicate with the exterior by means of a pair of ciliated pore-canals placed at the posterior end of their respective segments.
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  • and segments.
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  • I t may, however, be pointed out that Brachiopods seem to belong to that class of animal which commences life as a larva with three segments, and that tri-segmented larvae have been found now in several of the larger groups.
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  • It is not desirable to occupy the limited space of this article by a full description of the limbs and segments of Limulus and Scorpio.
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  • Following the prosoma is a region consisting of six segments (figs.
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  • Passing on now from the mesosoma we come in Scorpio to the metasoma of six segments, the first of which is broad whilst the rest are cylindrical.
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  • Perhaps the most important general agreement of Scorpio compared with Limulus and the Eurypterines is the division of the body into the three regions (or tagmata) - prosoma, mesosoma and metasoma - each consisting of six segments, the prosoma having leg-like appendages, the mesosoma having foliaceous appendages, and the metasoma being destitute of appendages.
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  • - Third leg of Limulus Polyphemus, showing the division of the fourth segment of the leg by a groove S into two, thus giving seven segments to the leg as in scorpion.
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  • The Arabic numerals indicate the segments of the legs.
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  • The wide divarication of the lateral cords in the prosoma and their connexion by transverse commissures, together with the " attraction " of ganglia to the prosomatic ganglion group which properly belong to hinder segments, are very nearly identical in the two animals.
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  • 38) from six to sixteen segments are clearly marked by ridges and grooves in the metasomatic tagma, whilst in Illaenus the shield so formed is large but no somites are marked out on its surface.
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  • From the front of this region new segments are produced in the first instance, and are added during growth to the existing series.
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  • In the latter a further specialization is shown in the fusion of the body segments.
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  • Mesosomatic segments furnished with large plate-like appendages, the 1st pair acting as the genital operculum, the remaining pairs being provided with branchial lamellae fitted for breathing oxygen dissolved in water.
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  • The mouth lying far back, so that the basal segments of all the prosomatic appendages, excepting those of the 1st pair, are capable of acting as masticatory organs.
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  • Not freeswimming, none of the prosomatic appendages modified to act as paddles; segments of the mesosoma and metasoma (= opisthosoma) not more than ten in number, distinct or coalesced.
    0
    0
  • - Free-swimming forms, with the appendages of the 6th or 5th and 6th pairs flattened or lengthened to act as oars; segments of mesosoma and metasoma (= opisthosoma), twelve in number.
    0
    0
  • I to 8, Segments of the sixth m, Chilarium or metasternite of prosomatic appendage.
    0
    0
  • Mouth situated more forwards than in Delobranchia, no share in mastication being taken by the basal segments of the 5th and 6th pairs of prosomatic appendages.
    0
    0
  • - Prosoma covered by a single dorsal shield, bearing typically median and lateral eyes; its sternal elements reduced to a single plate lodged between or behind the basal segments of the 5th and 6th pairs of appendages.
    0
    0
  • Appendages of 1st pair.tri-segmented, chelate; of 2nd pair chelate, with their basal segments subserving mastication; of 3rd, 4th, 5th and 6th pairs similar in form and function, except that in recent and Carboniferous forms the basal segments of the 3rd and 4th are provided with sterno-coxal (maxillary) lobes, those of the 4th pair meeting in the middle line and underlying the mouth.
    0
    0
  • - The 3rd, 4th, 5th and 6th pairs of appendages short, stout, tapering, the segments about as wide as long, except the apical, which is distally slender, pointed, slightly curved, and without distinct movable claws.
    0
    0
  • - The 3rd, 4th, 5th and 6th pairs of appendages slender, not evenly tapering, the segments longer than wide; the apical segment short, distally truncate, and provided with a pair of movable claws.
    0
    0
  • - Comparison of the sixth prosomatic limb of a recent scorpion (B), of Palaeophonus (C), and of Limulus (A), showing their agreement in the number of segments; in the existence of a movable spine, Sp, at the distal border of the fifth segment; in the correspondence of the two claws at the free end of the limb of Scorpio with two spines similarly placed in Limulus; and, lastly, in the correspondence of the three talon-like spines carried on the distal margin of segment six of recent scorpions with the four larger but similarly situated spines on the leg of Limulus; s, groove dividing the ankylosed segments 4 and 5 of the Limulus leg into two.
    0
    0
  • - Appendages of 1st pair bisegmented, without poison gland; of 2nd pair prehensile, their basal segments underlying the proboscis, and furnished with sterno 1 to i 1, Somites of the opisthosoma (mesosoma plus metasoma).
    0
    0
  • Appendages of 2nd pair with their basal segments united in the middle line and incapable of lateral movement; appendages of 3rd pair with only the apical segment many-jointed.
    0
    0
  • Appendages of 2nd pair folding in a horizontal plane; their basal segments n From Lankester, Q.
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    0
  • (Original drawing by Pocock.) freely movable; claw free or fused; basal segments of 4th and 5th pairs widely separated by the sternal area; appendages of 3rd pair with all the segments except the proximal three, forming a manyjointed flagellum.
    0
    0
  • Appendages of 1st pair have two segments, as in Pedipalpi, but are furnished with poison gland, and are retroverts.
    0
    0
  • Appendages of 1st pair consisting of three segments, completely chelate, without poison gland; of 2nd pair slender, leg-like, tipped with three claws, the basal segment without sterno-coxal process taking no share in mastication, and widely separated from its fellow of the opposite side; 3rd, 4th, 5th and 6th appendages similar in form to the 2nd and to each other.
    0
    0
  • Proboscis free, not supported from below by either the prosternum or the basal segments of the appendages of the 2nd pair.
    0
    0
  • Rostrum free, not supported by either the prosternum or the basal segments of the appendages.
    0
    0
  • suctorial) organ, and no claws at the tip; their basal segments united in the middle line and furnished with sterno-coxal process.
    0
    0
  • Remaining pairs of appendages with their basal segments immovably fixed to the sternal surface, similar in form, the posterior three pairs furnished with two claws supported on long stalks; the basal segments of the 6th pair bearing five pairs of tactile sensory organs or malleoli.
    0
    0
  • Appendages of 2nd pair very large and completely chelate, their basal segments meeting in the middle line, as in the Uropygi, and provided in front with membranous lip-like processes underlying the proboscis.
    0
    0
  • Appendages of the 3rd, 4th, 5th and 6th pairs similar in form and function, tipped with two claws, their basal segments in contact in the median ventral line.
    0
    0
  • I to VI, Basal segments of the 2, 3, 10, The second, third and six prosomatic appendages.
    0
    0
  • Appendages of 2nd pair, with their basal segments uniting in the middle line below the mouth, weakly chelate at apex.
    0
    0
  • Appendages of 3rd, 4th, 5th and 6th pairs similar in form; their basal segments in contact in the middle line and immovably welded, except those of the 3rd pair, which have been pushed aside so that the bases of the 2nd and 4th pairs are in contact with each other.
    0
    0
  • Opisthosoma confluent throughout its breadth with the prosoma, with the dorsal plate of which its anterior tergal plates are more or less fused; at most ten opisthosomatic somites traceable; the generative aperture thrust far forwards between the basal segments of the 6th appendages.
    0
    0
  • Respiratory organs tracheal, opening by a pair of stigmata situated immediately behind the basal segments of the 6th pair of appendages on what is probably the sternum of the 2nd opisthosomatic somite and also in some cases upon the 5th segment of the legs.
    0
    0
  • In the Phalangiotarbi the appendages resembled those of the Anthracomarti, except that the basal segments of the last four pairs were usually approximated in the middle line leaving a long and narrow sternal area between; and the carapace of the prosoma was unsegmented.
    0
    0
  • - Opisthosoma consisting of ten segments defined by integumental grooves, each of the anterior four of these furnished with a single pair of dorsally-placed spiracles or tracheal stigmata.
    0
    0
  • - Integument soft, strengthened by special sclerites, those on the ventral surface of the prosoma apparently representing the basal segments of the legs embedded in the skin.
    0
    0
  • Archimedes' problem of dividing a sphere by a plane into two segments having a prescribed ratio,was first expressed as a cubic equation by Al Mahani, and the first solution was given by Abu Gafar al Hazin.
    0
    0
  • In such cases the paths of degeneration are so neatly defined that, when the tissues are prepared after death by modern methods, they are plainly to be seen running along certain columns, the subdivisions of which in the normal state may hardly be distinguishable one from another: some run in strips along the periphery of the spinal cord, at its anterior, middle or posterior segments, as the case may be; in other cases such strips occur within its substance, whether along columns of cells or of white matter.
    0
    0
  • high, and large compound leaves with broad sheathing stalks, and broad, cut or lobed segments.
    0
    0
  • With few exceptions they are composed (i) of a minute organ of fixation (the scolex), which marks the proximal attached end of the body; (2) of a narrow neck from which (3) a number of segments varying from three to several thousands are budded off distally.
    0
    0
  • These segments, or " proglottides," become detached in groups, and if kept moist retain their powers of movement and vitality for a considerable time.
    0
    0
  • This fact gave rise in ancient times to the false idea that the tapeworm originated from the union of these segments; and in modern times it has led to the view that the tapeworm is not a segmented organism (the monozoic view), but is a colony composed of the scolex which arises from the embryo and of the proglottides, which are asexually produced buds that, upon or before attaining their full size and maturity, become separated, grow, and, in some cases, live freely for a time, just as the segments of a strobilating jelly-fish grow, separate and become sexual individuals (the polyzoic view).
    0
    0
  • The body, or " strobila," consists of a usually minute organ of attachment (scolex or its representative) which is imbedded in the intestinal membrane, and of a series of segments that arise from the base of the scolex and increase in size distally.
    0
    0
  • The segments into which the body is divided vary considerably in number, size and form.
    0
    0
  • In every species the segments develop from the scolex distally and increase in size with the maturation of the contained female genital organs.
    0
    0
  • in length) from the common fowl detaches its four or five segments into the intestine, where they attain a length of 2 trim., and a breadth of 1.25; that is, more than twice the size of the parent.
    0
    0
  • This statement is quite consistent with the continuous production of new segments at the neck of the scolex, for such a process is analogous to the development of the segments in a Chaetopod, which is a perfectly distinct phenomenon from the regeneration of new segments to supply the place of a head or tail-end or some other portion that has been lesioned.
    0
    0
  • known by the presence of the proglottides or mature segments in the stools.
    0
    0
  • In the Taenia solium it takes 3 to 3z months from the time of ingestion of the embryo to the passage of the matured segments, but in the Taenia saginata the time is only about 60 days.
    0
    0
  • The segments of the Taenia solium are usually given off in chains,.
    0
    0
  • All segments passed should be burnt, and they should never be thrown where the embryos may become scattered.
    0
    0
  • Males and females are like each other in size, but may be distinguished by the difference in the number of visible abdominal segments, the male having nine and the female seven.
    0
    0
  • The palpi vary in form and in the number of their component segments, and the proboscis, though usually straight, may be curved (as in Megarhinus) or otherwise modified in shape.
    0
    0
  • This condition may be cured completely, or greatly improved, by the use of lenses whose surfaces are segments of cylinders.
    0
    0
  • The flowers are regular, with a perianth springing from above the ovary, tubular below, with spreading segments and a central corona; the six stamens are inserted within the tube.
    0
    0
  • cyclamineus is a pretty dwarf subspecies, native of Portugal, with narrow linear leaves and drooping flowers with reflexed lemon-yellow segments and an orange-yellow corona N.
    0
    0
  • Macmillan & Co., Ltd.) b, bristle; cs, caudal spine; ph, pharynx; s s', the spines on the two segments of the proboscis; sg, salivary glands; st, stomach.
    0
    0
  • The body is divided into eleven segments and the protrusible proboscis apparently into two, and the cuticle of the central segment is thickened to form three plates, one dorsal and two ventrolateral.
    0
    0
  • truncatum the flowers have a very different aspect from that of other Cacti, from the mouth of the tube being oblique and the segments all reflexed at the tip. The short separate pieces of which these plants are made up grow out of each other, so that the branches may be said to resemble leaves joined together endwise.
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    0
  • H, Head; 1, 2, 3, the thoracic segments; i., ii., the first and second abdominal segments; i., being the propodeum.
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    0
  • The legs of Hymenoptera are of the typical insectan form, and the foot is usually composed of five segments.
    0
    0
  • In many families the trochanter appears to be represented by two small segments, there being thus an extra joint in the leg.
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    0
  • It is almost certain that the distal of these two segments really belongs to the thigh, but the ordinary nomenclature will be used in the present article, as this character is of great importance in discriminating families, and the two segments in question are referred to the trochanter by most systematic writers.
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    0
  • Hartig's character drawn from the trochanter - whether of two segments or undivided - the groups being termed respectively Ditrocha and Monotrocha.
    0
    0
  • The feelers with twelve to fifteen segments are thread-like and straight.
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    0
  • Only three or four abdominal segments are visible, the hinder segments being slender and retracted to form a telescope-like tube in which the ovipositor lies.
    0
    0
  • The head varies greatly in shape, and the feelers have usually but few segments - often only four or five.
    0
    0
  • The number of tarsal segments is reduced; often three, two or only one may be present instead of the typical insectan number five.
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    0
  • Eleven abdominal segments can be recognized, at least in the early stages; as the adult condition is reached, the hinder segments become reduced or modified in connexion with the external reproductive organs, and show, in some male Hemiptera, a marked asymmetry.
    0
    0
  • These three families have the foot with three segments.
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    0
  • The Capsidae are a large family of rather soft-skinned bugs mostly elongate in form with the two basal segments of the feelers stouter than the two terminal.
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    0
  • The hinder abdominal segments in the male show a curious asymmetrical arrangement, the sixth segment bearing on its upper side a small stalked plate (strigil) of unknown function, furnished with rows of teeth.
    0
    0
  • The feelers have one or more thickened basal segments, while the remaining segments are slender and threadlike.
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    0
  • The broad head carries, in addition to the prominent compound eyes, three simple eyes (ocelli) on the crown, while the feeler consists of a stout basal segment, followed by five slender segments.
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    0
  • In all the above mentioned families of Homoptera there are three segments in each foot.
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    0
  • The families Psyllidae (or " jumpers ") with eight or ten segments in the feeler and the Aleyrodidae (or " snowyflies ") distinguished by their white mealy wings, are of comparatively slight importance.
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  • The insect is fixed by this rostrum, which is inserted into the root of the vine for the purpose of sucking the sap. The abdomen consists of seven segments, and these as well as the anterior segments bear four rows of small tubercles on their dorsal surface.
    0
    0
  • The slides carrying the segments of the divided object-glass are mounted on a plate, which is fitted and ground to rotate ...
    0
    0
  • The slides are moved by the screws a and b, the divided heads of which serve to measure the separation of the segments.
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    0
  • The reading micrometers e, f also serve to measure, independently, the separation of the segments, by scales attached to the slides; such measurements can be employed as a check on those made by the screws.
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    0
  • - One of the segments is fixed in the axis of the telescope, and the eye-piece is also placed in the axis.
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    0
  • The eye-piece is fixed in the axis, and the segments are symmetrically displaced from the axis each by an amount equal to half the angle measured.
    0
    0
  • Of these methods Bessel generally employed the first because of its simplicity, notwithstanding that it involved a resetting of the right ascension and declination of the axis of the tube with each reversal of the segments.
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  • On the other hand it is not necessary to reset the telescope after each reversal of the segments.4 When Bessel ordered the Konigsberg heliometer, he was anxious to have the segments made to move in cylindrical slides, of which the radius should be equal to the focal length of the object-glass.
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  • 4) that Bessel had indicated, by notes in his handbooks, the following points which should be kept in mind in the construction of future heliometers: (I) The segments should move in cylindrical slides; b (2) the screw should be protected from dust; 6 (3) the zero of the position circle should not be so liable to change; 7 (4) the distance of the optical centres of the segments should not change in different position angles or otherwise; 8 (5) the points of the micrometer screws should rest on ivory plates; 9 (6) there should be an apparatus for changing the screen.'° Wilhelm Struve, in describing the Pulkowa heliometer,' 1 made The distances of the optical centres of the segments from the eye-piece are in this method as I; secant of the angle under measurement.
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  • The optical centres of the segments would also remain at the same distance from the eye-piece at all angles of separation.
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  • 8 We have been unable to find any published drawing showing how the segments are fitted in their cells.
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  • by Merz in 1839 on the model of Bessel's heliometer, submits the following suggestions for its improvement: 1 (I) to give automatically to the two segments simultaneous equal and opposite movement; 2 and (2) to make the tube of metal instead of wood; to attach the heliometer head firmly to this tube; to place the eye-piece permanently in the axis of the telescope; and to fix a strong cradle on the end of the declination axis, in which the tube, with the attached head and eye-piece, could rotate on its axis.
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  • Thus the simple connexion of the two screws by cogwheels to give them automatic opposite motion is not an available method unless the separation of the segments is independently measured by scales.
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  • They provided a splendid, rigidly mounted, equatorial stand, fitted with every luxury in the way of slow motion, and scales for measuring the displacement of the segments were read by powerful micrometers from the eye-end.
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  • But it is still more curious that it was not afterwards carried out, for the communication of automatic symmetrical motion to both segments only involves a simple alteration previously described.
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  • means of measuring the focal point were provided; symmetrical motion was given to the slides; scales on each slide were provided instead of screws for measuring the separation of the segments, and both scales were read by the same micrometer microscope; a metallic thermometer was added to determine the temperature of the scales.
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  • a is the eye-piece, b the handle for moving the segments, c the micrometer microscope for reading the scales and scale micrometer, d the micrometer readers of the position and declination circles, e the handle for rotating the large wheel E which carries the screens.
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  • The disk, 30 with its small projecting handle enables the 2 segments of the divided object to be moved rapidly or with any required delicacy relative to each other.
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  • pp. 199-209) the rays from the object-glass pass successively through lenses as follows: The lens b is divided, and one of the segments is moved by a micrometer screw.
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  • by placing circular diaphragms on the two segments of the object-glass.
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    0
  • The white perianth is six-parted, the outer three segments being larger and more convex than the inner series.
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  • Elwesii, a native of the Levant, with large flowers, the three inner segments of which have a much larger and more conspicuous green blotch than the commoner kinds.
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  • Of these methods one of the chief is the plan of tubbing, or lining the excavation with an impermeable casing of wood or iron, generally the latter, built up in segments forming rings, which are piled upon each other throughout the whole depth of the water-bearing strata.
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  • This consists of a heavy cast iron ring, known as a wedging crib, or curb, also fitted together in segments, which is lodged in a square-edged groove cut for its reception, tightly caulked with moss, and wedged into position.
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    0
  • Upon this the tubbing is built up in segments, of which usually from 10 to 12 are required for the entire circumference, the edges being made perfectly true.
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    0
  • The water-tight lining may be either a wrought iron tube, which is pressed down by jack screws as the borehole advances, or cast iron tubbing put together in short complete rings, in contradistinction to the old plan of building them up of segments.
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    0
  • The vibrations of the larger mass are communicated to the thread, which by proper adjustment of its length and tension vibrates in unison and divides itself into one or more loops or ventral segments easily discernible by a spectator.
    0
    0
  • In like manner, on further lowering the tension to one ninth, three ventral segments will be formed, and so on.
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    0
  • The law that, caeteris paribus, n varies inversely as the thickness may be tested by forming a string of four lengths of the single thread used before, and consequently of double the thickness of the latter, when, for the same length and tension, the compound thread will exhibit double the number of ventral segments presented by the single thread.
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  • The plate is then bowed at the edge and is thrown into vibration between nodal lines or curves and the sand is thrown from the moving parts or ventral segments into these lines, forming " Chladni's figures."
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    0
  • As in the case of a musical string, so here we find that the pitch of the note is higher for a given plate the greater the number of ventral segments into which it is divided; but the converse of this does not hold good, two different notes being obtainable with the same number of such segments, the position of the nodal lines being, however, different.
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  • But, if the pasteboard be interposed so as to intercept the vibrating segments AOB, DOC, the note becomes much more distinct.
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  • The reason of this is, that the segments of the plate AOD, BOC always vibrate in the same direction, but oppo sitely to the segments AOB, DOC. Hence, when the pasteboard is in its place, there are two waves of same phase starting from the two former segments, and reaching the ear after equal distances of transmission through the air, are again in the same phase, and produce on the ear a conjunct impression.
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  • 43, and having a piece of thin membrane stretched over the opening at the top C, some dry sand being strewn over the membrane, is so placed over a circular or rectangular vibrating plate that the ends A, B lie over the segments of the plate, such as AOD, COB in the previous figure, which are in the same state of motion.
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  • But if the same ends A, B be placed over oppositely vibrating segments (such as AOD, COD), the sand will be scarcely, if at all, affected.
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    0
  • Archimedes gave his results in the treatise IIepi Ti j c aOaipas Kai roD KUXLvbpov: he left unfinished the problem of dividing a sphere into segments whose volumes are in a given ratio.
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    0
  • Each chain over a shore span consists of two segments, the longer attached to the tie at the top of the river tower, the shorter to the link at the top of the abutment tower, and the two jointed together at the lowest point.
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    0
  • Generally, the greatest shear S at C will occur when the longer of the segments into which C divides the girder is fully loaded and the other is unloaded, the leading load being at C. If the loads are very unequal or unequally spaced, a trial or two will determine which position gives the greatest value of S.
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    0
  • The abdomen is usually sharply bent between the third and fourth segments and has a characteristically humped appearance when straightened out.
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    0
  • They are small insects, having straight antennae, and a compressed, usually very short abdomen with the second or second and third segments greatly developed, and the rest imbricated, and concealing the partially coiled ovipositor.
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    0
  • The cup-shaped flowers have six regular segments in two rows, as many free stamens, and a three-celled ovary with a sessile stigma, which ripens into a leathery many-seeded capsule.
    0
    0
  • The early flowering "Van Thol" tulips, the segments of which are mostly scarlet with yellow edges, are derived from T.
    0
    0
  • The Copepoda have normally a segmented body, not enclosed in a bivalved shell-covering, the segments not exceeding eleven, the limbs not branchial.
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    0
  • - In this division the body is partly covered by a broad shield, united in front with the head; the eyes are sessile, the first antennae are small, the second rudimentary or wanting; of the numerous feet, sometimes sixty-three pairs, exceeding the number of segments to which they are attached, the first pair are more or less unlike the rest, and in the female the eleventh have the epipod and exopod (flabellum and sub-apical lobe of Lankester) modified to form an ovisac. Development begins with a nauplius stage.
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    0
  • (e) Cytherellidae, which, unlike the Ostracoda in general, have the hinder part of the body segmented, at least ten segments being distinguishable in the female.
    0
    0
  • - The body is not encased in a bivalved shell; its articulated segments are at most eleven, those behind the genital segment being without trace of limbs, but the last almost always carrying a furca.
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    0
  • In appearance an ordinary Copepod is divided into foreand hind-body, of its eleven segments the composite first being the head, the next five constituting the thorax, and the last five the abdomen.
    0
    0
  • The coalescence of segments, though frequent, does not after a little experience materially confuse the counting.
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    0
  • In many lizards the muscles of the segments of the tail are so loosely connected and the vertebrae are so weak that the tail easily breaks off.
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  • However different in structure Trilobites may be, they all agree in possessing a head-shield usually semi-circular in shape, which results from the fusion of apparently five segments, and bears, except in some blind forms, a pair of large reniform compound eyes like those of the king-crab (Xiphosura).
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  • This head-shield is succeeded by a varying number of free segments, each of which consists of a medium convex tergal piece and a pair of arched lateral plates, the pleura, of which there is one on each side.
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    0
  • The mid-region of the body, composed of jointed segments, is followed by a larger or smaller region consisting of fused segments and termed the pygidium or caudal shield, which in some cases is as large as the head-shield itself, in other cases much smaller.
    0
    0
  • When the pygidium is large and composed of many segments, the number of free body segments is correspondingly reduced, and vice versa.
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    0
  • It is with respect to this number of segments that respectively constitute the pygidium and the midregion of the body that Trilobites differ most markedly from each other; and it is a singular fact that the extremes in structural organization in this particular to be met with in the Trilobita are found side by side in strata of Cambrian age.
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  • In Paradoxides, for example, there are about twenty freely movable segments followed by a very short and small pygidium, whereas in Agnostus the freely movable segments are reduced to two and the pygidium is as large as the cephalic shield.
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  • In this genus the number of segments composing the pygidium is obscured, as also it is in the genus Illaenus, which has as many as ten movable segments preceding the large semi-circular pygidium; but in such forms as Ogygia and Asaphus, which have about eight free segments, the sutural lines on the pygidium indicate that it is composed of about a dozen or more segments.
    0
    0
  • Somewhat resembling Agnostus is Microdiscus, with four movable segments and a large pygidium consisting of about five fused segments, the lines of union between the latter being clearly indicated.
    0
    0
  • In the region of the mouth the basal segments were armed with teeth and subserved the purpose of mastication.
    0
    0
  • Under the pygidium or caudal shield the appendages were much shortened, and their main branch consisted of broader and flatter segments than those of the preceding limbs.
    0
    0
  • the area of a lune or meniscus is expressible as the difference or sum of two segments, and the circumference as the sum of two arcs.
    0
    0
  • Some of the families - the stone-flies, for example - have the young insect much like the adult, growing its wings visibly outside the thoracic segments, and active at all stages of its life.
    0
    0
  • A remarkable point in the Plecoptera is the presence in some forms (Pteronarcys) of small branching gills on the three thoracic and the front abdominal segments.
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    0
  • Mag- b and c, Hind segments of male and nified 6 times.
    0
    0
  • The Embiidae live in warm countries, and are very retiring in their habits, hiding under stones where they spin webs formed of silk produced by glands in the basal segments of the fore-feet.
    0
    0
  • The feelers of these insects are elongate and thread-like, consisting of from a dozen to nearly thirty segments.
    0
    0
  • They are abundantly distinct, however, through the short feelers with only three to five segments and the conspicuous prothorax.
    0
    0
  • A remarkable feature is the frequent concrescence of mesothorax and metathorax and in some cases, even, their fusion with the anterior abdominal segments.
    0
    0
  • In the Leptoceridae, Hydropsychidae, Rhyacophilidae and Hydroptilidae the palps of the males have five segments like those of the females.
    0
    0
  • The most that can be said is that the Chaetognaths begin life with three segments, a feature they share with such widelydiffering groups as the Brachiopoda, the Echinoderma and the Enteropneusta, and probably Vertebrata generally.
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  • The Acridiidae have the feelers and the ovipositor relatively short, and possess only three tarsal segments; their ears are situated on the first abdominal segment and the males stridulate by scraping rows of pegs on the inner aspect of the hind thigh, over the sharp edges of the forewing nervures.
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  • The head is large, the neck slender, the antennae short and the legs longish, and the appearance of the long stalk-like waist of the ant is produced by a patch of whitish hair on each side of the forepart of the abdomen which has the effect of cutting away the parts of the segments so covered, leaving a narrow dark-coloured median area to represent the waist.
    0
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  • When the larvae are disturbed the similarity is produced with startling suddenness by the telescopic contraction of the anterior segments in such a manner as to suggest a triangular, pointed head with two large dorsal eyes.
    0
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  • cardinalis, 2 to 3 ft., has scarlet flowers, with the limb segments reflexed; M.
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  • The spores, which may be unior multi-cellular, are either abstricted free from the ends of hyphae (acrogenous), or formed from segments in their course (chlamydospores) or from protoplasm in their interior (endogenous).
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  • short segments of the hyphae become stored with fatty reserves and act as spores.
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  • The segments of the hyphae in this group usually contain several nuclei.
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  • From each of the four segments in the case of Tremella a long outgrowth arises which reaches to the surface of the hymenium From Strasburger's Lehrbuch der Bolanik, by permission of Gustav Fischer.
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  • 9), when the segments extend to about the middle, or pinnatipartite, when the divisions extend nearly to the midrib.
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  • Pascal solved the hitherto refractory problem of the general quadrature of the cycloid, and proposed and solved a variety of others relating to the centre of gravity of the curve and its segments, and to the volume and centre of gravity of solids of revolution generated in various ways by means of it.
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  • Polygordius and Protodrilus live in sand, but while the former moves by means of the contraction of its body-wall muscles, Protodrilus can progress by the action of the bands of cilia surrounding its segments, and of the longitudinal ciliated ventral groove.
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  • The body is composed of a large number of segments; the prostomium bears a pair of tentacles; the nervous system consists of a brain and longitudinal ventral nerve cords closely connected with the epidermis (without distinct ganglia), widely separated in Saccocirrus, closely approximated in Protodrilus, fused together in Polygordius; the coelom is well developed, the septa are distinct, and the dorsal and ventral longitudinal mesenteries are complete; the nephridia are simple, and open into the coelom.
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  • (From Goodrich.) present in the majority of the trunk segments, have become much complicated (fig.
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  • It resembles Dinophilus in the possession of a ventral pharyngeal pouch (which bears teeth in Histriodrilus only), the small number of segments, and absence of distinct septa, the absence of a vascular system, the presence of distinct ganglia on the ventral nerve cords, and of small nephridia which do not appear to open internally.
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  • These most commonly resemble segments of circles, but are not infrequently elliptical or irregular in outline.
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  • In Sirogonium there is cell-division in the parent-cell prior to conjugation; and as two segments are cut off in the case of the active gamete, and only one in the case of the passive gamete, there is a corresponding difference of size, marking another step in the sexual differentiation.
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  • The oogonium, seated on a stalk cell, is surrounded by an investment consisting of five spirallywound cells, from the projecting ends of which segments are cut off, constituting the so-called stigma.
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  • In the first it is a biconvex lens, from which segments are continually cut off parallel to the posterior surface; and in the second an elongated dome, from which segments are cut off by a transverse wall.
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  • From this cell segments are cut off in three or four lateral oblique planes.
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  • Growth in these cases takes place by means of an apical cell, from which successive segments are cut off by means of a transverse wall.
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  • To the law that no subsequent transverse division takes place in segments cut off from the apical cell, there seem to be two exceptions: first, the calcareous genus Corallina, in the pliable joints of which intercalated division occurs; and, second, the Nitophylleae, in which, moreover, median longitudinal division of axial cells is said to occur.
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  • When the cystocarps or segments of cystocarps are formed in the substance of a thallus, the site is marked merely by a swelling of the substance.
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  • Seen from an eminence on their surface, the inference is irresistible that these plateaus are fragments of the original tableland, trenched into segments by the formation of the longitudinal and transverse valleys.
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  • Unlike the giraffe, the length of the limbs is due to the elongation of their upper segments, and that of the neck to the lengthening of only the hinder vertebrae.
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  • Hottonia (water violet) is a floating water plant with submerged leaves cut into fine linear segments.
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  • In thick plates it is not attempted by hand, but pressing is done between dies, or segments of the sphere are prepared separately and riveted together.
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  • The polygon of forces is then made up of segments of a vertical line.
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  • When the given forces are all parallel, the force-polygon consists of a series of segments of a straight line.
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  • The segments DE, nA then represent ~he upward pressures of the two supports on the beam, which pressures together with the given loads constitute a system of forces in equilibrium.
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  • 59 p is the line with respect to which moments are to be taken, and the masses of the respective particles are indicated by the ft Z a corresponding segments of a line in the force-diagram, E drawn parallel to p. The A funicular ZABCD.
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  • to the ratio of the segments ~
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  • Between the eyes and the tail-piece in all the orders nineteen segments are counted, the proof of a segment's existence depending on its separateness, complete or partial, or on a sutural indication, or else on the pair of appendages known to belong to it.
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  • All these marks may fail, and then the species must be proved to be Malacostracan by other evidence than the number of its segments; but if some exceptions exhibit fewer, none of the Malacostraca exhibits more than 19 (+ 1 or + 2) segments, unless the Nebaliidae be included.
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  • The latter obscurity results either from coalescence, to which all joints and segments are liable, or from subdivision, which occasionally affects joints even in the trunk-legs.
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  • The carapace, formerly referred only to the antennar-mandibular segments, may perhaps in fact contain elements from any number of other segments of head and trunk, Huxley, Alcock, Bouvier giving support to this opinion by the sutural or other divisional lines in Potamobius, Nephrops, Thalassina, and various fossil genera.
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  • At least three segments of the trunk are left uncovered by the carapace.
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  • The last four or five segments of the trunk are free from the carapace.
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  • The slender pleon has always six distinct segments, the sixth carrying two-branched uropods, the preceding five armed with no pleopods in the female, whereas in the male the number of pairs varies from five to none.
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  • Like the genuine isopods, they have seven pairs of trunk-legs, but instead of having seven segments of the middle body (or peraeon) FIG.
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  • normally free, they have the first one or two of its segments coalesced with the head.
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  • The bristle tails have an abdomen of eleven segments, the tenth usually carrying a pair of long many-jointed tail-feelers (cerci, fig.
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  • 1, ii.-ix.), accompanied by paired eversible sacs, probably respiratory in function - on eight (or fewer) other abdominal segments.
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  • The abdomen consists of six segments only.
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  • The third abdominal segment usually carries a pair of short appendages whose basal segments are fused together; this is the "catch" (fig.
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  • 2, 7), whose function is to hold in place the "spring," which is formed by the fourth pair of abdominal appendages - also with fused basal segments.
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  • The fused basal segments of the appendages form the "manubrium" of the spring, which carries the two "dentes" (usually elongate II.
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  • ii.-x, Appendages on 2nd to Toth abdominal segments.
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  • The eversible sacs on the abdominal segments are shown, some protruded and some retracted.
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  • One bacterium might thus produce in twenty-four hours a number of segments amounting to many millions of millions.
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  • p, a rodlet in this condition (but divided into four segments) after treatment with alcoholic iodine solution.
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  • The rodlets after three hours' culture in a drop of aqueous become septate later, and spores are developed in the segments.
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  • The spore may be formed in short or long segments, the cellwall of which may undergo change of form to accommodate itself to the contents.
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  • The specimen was cultivated in broth, and spores are drawn a little too small - they should be of the same diameter transversely as the segments.
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  • Vegetative body of branched or unbranched cell-filaments, the segments of which separate as swarm-cells (Gonidia).
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  • To the right, strobila condition of the scyphistoma, consisting of thirteen metameric segments; the uppermost still possesses the sixteen tentacles of the scyphistoma; the remainder have no tentacles, but are ephyrae, each with eight bifid arms (processes of the disc).
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  • - As in all Arthropoda the body consists of a series of segments or somites which may be free or more or less coalesced together.
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  • Whether the movably articulated segments which bear the FIG.
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  • As a rule the protopodite is composed of two segments, though one may be reduced or suppressed and occasionally three may be present.
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  • In the appendages near the mouth one or both of the protopodal segments may bear inwardly-turned processes, assisting in mastication and known as gnathobases.
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  • When used for walking, one of the rami, usually the inner, is stout and cylindrical, terminating in a claw, and having the segments united by definite hinge-joints.
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  • In many Crustacea the eyes are borne on stalks which are movably articulated with the head and which may be divided into two or three segments.
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  • The maxillulae and maxillae (or, as they are often termed, first and second maxillae) are nearly always flattened leaf-like appendages, having gnathobasic lobes or endites borne by the segments of the protopodite.
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  • The endopodite, when present, is unsegmented or composed of few segments and forms the " palp," and outwardlydirected lobes representing the exopodite and epipodites may also be present.
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  • Three series are distinguished, podobranchiae, attached to the proximal segments of the appendages, pleurobranchiae, springing from the body-wall, and an intermediate series, arthrobranchiae, inserted on the articular membrane of the joint between the limb and the body.
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  • Many of the spurs or broken segments of ranges thus formed abut steeply upon the Black Sea, so that this littoral region is on the whole very rugged and not readily accessible, especially as the general elevations are considerable.
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  • 5); the segments, which are broadly ovate or rhomboidal, have several forked spreading veins, and resemble the large pinnules of some species of Adiantum.
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  • In rare cases the pinnae of cycads are lobed or branched: in Dioon spinulosum (Central America) the margin of the segments bears numerous spinous processes; in some species of Encephalartos, e.g.
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  • 3); in Encephalartos, Dioon, &c., both rachis and segments are straight; in Zamia the rachis is bent or slightly coiled, bearing straight pinnae.
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  • 10 and 11) have a long, slender petiole terminating in a fanshaped lamina, which may be entire, divided by a median incision into two wedge-shaped lobes, or subdivided into several narrow segments.
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  • He solved also the: second problem, and he showed that by the same method other curves might be found which shall cut off three or more segments having the like properties.
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  • In the Ixodidae the capitulum is not overlapped by a forward extension of the dorsal area, which is smooth and firmly chitinized either in front or all over; the palpi are usually modified, that is to say, their second and third segments are usually excavated internally to form a sheath for the hypostome; there is a distinct sucker beneath the claws and the difference between the sexes is well marked, the males having the dorsal integument thickly and continuously chitinized, whereas in the females only its anterior portion bears a chitinous plate, the rest of the integument being soft to admit of its distension by the blood which is imbibed in quantity by members of this sex.
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  • If a line S2 cut an arc aa at b, so that the two segments ab, ba lie on opposite sides of the line, then projecting the figure so that the line Sl goes off to infinity, the tangent at b is projected into the asymptote, and the arc ab is projected into a hyperbolic leg touching the asymptote at one extremity; the arc ba will at the same time be projected into a hyperbolic leg touching the same asymptote at the other extremity (and on the opposite side), but so that the two hyperbolic legs may or may not belong to one and the same branch.
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  • In Cheirostrobus a similar relation of sporangiophores to bracts existed, but here each bract was divided into three segments.
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  • That these three sterile segments, with their sporangiophores, are together comparable to one of the bracts of Sphenophyllum, with its sporangiophores, is shown by the vascular supply in each case being derived from a single leaf-trace, So far as is at present known, the Sphenophyllales were homosporous.
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  • 2, d), or more or less compound, the degree of branching in the sterile and fertile segments exhibiting a general parallelism.
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  • The sporangia are borne singly or in sori of two or three on the margin or under surface of leaves, the fertile pinnae of which differ more or less from the sterile segments.
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  • (2) In all existing Arthropoda the region in front of the mouth is no longer formed by the primitive prostomium or head-lobe, but one or more segments, originally post-oral, with their appendages have passed in front of the mouth (prosthomeres).
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  • The brain no longer consists solely of the nerve-ganglion-mass proper to the prostomial lobe, as in Chaetopoda, but is a composite (syncerebrum) produced by the fusion of this and the nerve-ganglion-masses proper to the prosthomeres or segments which pass forwards, whilst their parapodia (= appendages) become converted into eye-stalks, and antennae, or more rarely grasping organs.
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  • The body of the Arthropoda is more or less clearly divided into a series of rings, segments, or somites which can be shown to be repetitions one of another, possessing identical parts and organs which may be larger or smaller, modified in shape or altogether suppressed in one somite as compared with another.
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  • to) becomes in Crustacea the " walking leg " of the mid-region of the body; it becomes the palp or jointed process of anterior segments.
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  • The range of modification of which the rami or limb-branches of the limbs of Arthropoda are capable is very large, and in allied orders or even families or genera we often find d z what is certainly the palp of the same appendage (as determined by numerical position of the segments) - in one case antenniform, in another chelate, in another pediform, and in another reduced to a mere stump or absent altogether.
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  • The principal forms assumed by the Arthropod parapodium and its rami may be thus enumerated: (1) Axial corm well developed, unsegmented or with two to four segments; lateral endites and exites (rami) numerous and of various lengths (certain 8 limbs of lower After Lankester, Q.
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  • I, 2; The two segments of the axis.
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  • It varies as to the presence or absence of the jawprocess and as to the stoutness of the segments of the ramus, their number (frequently six, plus the basal corm), and the modification of the free end.
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  • Ax' to Ax el, the four segments of the axis with muscular bands.
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  • In other cases the stigmata are definitely paired and placed in a few segments or in several.
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  • In higher specialized forms these branchial processes become first of all limited to five segments of the mesosoma, then sunk beneath the surface as pulmonary organs, and finally atrophied, their place being taken by a well-developed tracheal system.
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  • They appear to be serial equivalents (homogenous meromes) of the tracheal gills, which develop in a like position on the abdominal segments of some aquatic Hexapods.
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  • Africa is thus composed of two segments at right angles, the northern running from east to west, the southern from north to south, the subordinate lines corresponding in the main to these two directions.
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  • The most striking feature is the existence of two great lines of depression, due largely to the subsidence of whole segments of the earth's crust, the lowest parts of which are occupied by vast lakes.
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  • The most important relation between the co-ordinates of a point on an ellipse is: if N be the foot of the perpendicular from a point P, then the square on PN bears a constant ratio to the product of the segments AN, NA' of the major axis, this ratio being the square of the ratio of the minor to the major axis; symbolically PN2= AN.NA'(CB/CA) 2.
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  • With a combination of plates in plane-polarized and plane-analysed light the interference pattern with monochromatic light is generally very complicated, the dark curves when polarizer and analyser are crossed being replaced by isolated dark spots or segments of lines.
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  • The liver is tolerably symmetrical in general arrangement, being divided nearly equally into segments by a well-marked umbilical fissure.
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  • The legs of the fourth and fifth pairs differ from the others in the fact that the third pad (counting from the distal end of the leg) carries the opening of the enlarged nephridia of these segments.
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  • In the violet the calycine segments are prolonged downwards beyond their insertions, and in the Indian cress (Tropaeolum) this prolongation is in the form of a spur (calcar), formed by three sepals; in Delphinium it is formed by one.
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  • Coloured hairs are seen on the petals of Menyanthes, and on the segments of the perianth of Iris.
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  • - Gynoecium of the Flowerde-Luce (Iris), consisting of an inferior ovary (o) and a style which divides into three petaloid segments (s), each bearing a stigma (st).
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  • Also he gives two different reckonings of the segmentation, counting first eleven body segments without the caudal furca (p. 40), and then the caudal furca as itself the eleventh segment (p. 41).
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  • In the transverse section six sporophylls, each showing three segments, are represented.
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  • st, Laminae of sterile segments.
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  • twelve in a whorl, are each composed of six segments, three being inferior or dorsal, and three superior or ventral.
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  • The dorsal segments are sterile, corresponding to the bracts of Sphenophyllum Dawsoni, while the ventral segments constitute peltate sporangiophores, each bearing four sporangia, just as in a ax FIG.
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  • The great length and slender proportions of the segments give the cone a peculiar character, but the relations of position appear to leave no doubt as to the homologies with the fructification of Sphenophylleae; as regards the sporangiophores, Bowmanites Romeri occupies exactly the middle place between S.
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  • The axis of the cone in Cheirostrobus contains a polyarch stele, with solid wood, from the angles of which vascular bundles pass out, dividing in the cortex, to supply the various segments of the sporophylls.
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  • The leaves are highly compound, dividing dichotomously into several leaflets, each of which is deeply pinnatifid, with fine segments.
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  • Similarly, the genus Sagenopteris, characterized by a habit like that of Marsilia, and represented by fronds consisting of a few spreading broadly oval or narrow segments, with anastomosing veins, borne on the apex of a common petiole, is abundant in rocks ranging from the Rhaetic to the Wealden, but has not so far been satisfactorily placed.
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  • 7), which is characterized by tripinnate fronds with short linear ultimate segments, bearing a single row of A, Summit of petiole.
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  • Professor Nathorst, as the result of a more recent examination of Heer's specimen, found that the segments of the frond are characterized by the presence of two parallel veins instead of a single midrib, with a row of stomata between them; for this type of Cycadean leaf he proposed the generic name Pseudocycas.
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  • 18, G), characterized by the greater C, Greenland (Lower Cretaceous); D, Siberia (Jurassic); E, _Germany number and narrower form of the segments, which may (Wealden); F, England (Jurassic); H, China (Rhaetic).
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  • sacrum, whilst in a few others the number of segments is still further reduced by the co-ossification of one or two vertebrae preceding that corresponding to the normal sacral and by the fusion of the two first vertebrae, the extreme of reduction being found in FIG.
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  • We have developed a mouse model of vascular injury and, using our published technique, can measure leukocyte adhesion to artery segments.
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  • Over much of the surface, the original panel segments alternate with the new unpainted metal panels.
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  • The image on the left shows three yellow anthers at the tips of perianth segments.
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  • The second part is the ' choice aphorisms ' from the Seven Segments of Jerome Cardan.
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  • The abdomen is composed of varying numbers of segments; it bears no legs but may possess appendages, e.g. claspers used in mating.
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  • A simple artifice is used to represent any spanwise twist distribution by a combination of linear segments.
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  • Pioneer's report segments the potential WiMAX market into " fixed wireless backhaul " and " mobile " .
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  • At present there are just two main biomes -- each with four segments -- that eerily resemble the magnified eyes of a fly.
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  • brazils arranged like the segments of an orange.
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  • Each ripe pod contains many brazils arranged like the segments of an orange.
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  • For example, amylase catalyzes the breakdown of starch-based stains to smaller segments that make up the larger starch molecule.
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  • bronchusobe receives named lobar bronchi dividing them into segmental bronchi that supply the bronchopulmonary segments.
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  • The hadronic calorimeter measures the energy carried by hadrons entering each of its segments (see figure ).
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  • These lyric segments, deemed offensive by the moral majority have been joined together by Correa to form an absurd musical collage.
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  • commutator segments should be cleaned using wooden cocktail sticks.
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  • competes head-to-head with Alvarion, with both going after similar market segments with similar technology.
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  • concatenated speech segments join together.
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  • Once trained, the model can be used to measure how well concatenated speech segments join together.
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  • Systems with segment concatenation use small speech segments taken from human speech to create synthetic speech.
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  • The already defined ITSO product entities include one that can have multiple reservation segments, hardly a " bus concessionary " product.
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  • converge around an average yearly rate of about 30 %, with strong differentiation among market segments and countries.
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  • divided into various segments.
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  • The geometric continuum is infinitely divisible; segments, no matter how small or how large, can arise.
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  • Inside, the juicy and slightly fibrous yellow flesh is formed into segments that are attached to a firm central core.
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  • gated out of the final segments prior to gender classification.
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  • grapefruit segments.
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  • RNAs in the sera of Persian Gulf War veterans have segments homologous to chromosome 22q11.2.
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  • humerus fracture depends on the displacement of one or more of the four segments.
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  • Click the image for a large version Neurons in those segments then convey the impulses outward beyond the cord.
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  • incommensurable line segments.
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  • instrumentality of religion has changed, in important segments of the world faiths.
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  • Pull the segments apart and slice each thinly with the serrated knife, putting the pips in the cloth.
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  • leukocyte adhesion to artery segments.
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  • lobar bronchi dividing them into segmental bronchi that supply the bronchopulmonary segments.
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  • manipulated to fit computer screen, smaller segments can be zoomed in and out.
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  • affinity maturation is a consequence of somatic mutation in Ig gene segments.
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  • nephron segments and are necessary for both K secretion and Na absorption.
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  • neurons in the brain, which send electrical signals to specific levels, or segments, of the cord.
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  • They bulge outwards like grapefruit segments, giving two dimensions the appearance of three.
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  • oxygenateiage of oxygenating plants is soft with very fine segments through which the water passes freely without damaging the leaf segments.
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  • paralysis in muscles supplied by the same spinal segments.
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  • pastry tartlets made with fresh orange zest filled with delicious dark chocolate mix topped with fresh orange segments.
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  • White quartz pebbles were found on or near the bottom of all the ditch segments.
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  • Live dangerously with a Crash mode featuring 45 segments, each of which rewards you for creating the most massive pileups ever seen.
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  • The palps are always greatly enlarged, with the terminal segments modified into strong pincers used for catching and crushing prey.
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  • Combine them with sliced orange segments and a few toasted pine nuts for a delicious salad.
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  • plumbing pipes, producing melody by adding or subtracting segments.
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  • At break times, sliced red peppers, packets of grapes and fresh orange segments are available to buy.
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  • Instead of having four repeaters, we can have three with two interconnecting fibre-optic segments, each only 1km in length.
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  • rollback segments in the list.
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  • rubynsists of hundreds of letters hand written in many segments over a number of years by Bruce Roberts, the creator of synthetic rubies.
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  • Satsuma segments.
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  • segments of the cattle population.
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  • segments of DNA that regulate biological activity.
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  • BLOCKS Blocks are multiply aligned ungapped segments corresponding to the most highly conserved regions of proteins.
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  • A central dark bans broadens at the back to cover the final abdominal segments.
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  • The first three morphological segments to appear are thoracic segments.
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  • In effect, a spectrogram is built up from a multitude of power spectra of short, overlapping time segments of the signal.
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  • You must only put the names of already created rollback segments in the list.
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  • DIVISION 4 DOUBLE DAFFODIL CULTIVARS One or more flowers to a stem, with doubling of the perianth segments or the corona or both.
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  • Outline shapes Outline shapes, such as triangles, rectangles and parallelograms, consist of a series of straight-line segments between the vertices.
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  • They're market segments, often in the customer's mind.
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  • split into three colored segments that represent your weapons.
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  • straight-line segments used to produce the field.
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  • Lovely individual pastry tartlets made with fresh orange zest filled with delicious dark chocolate mix topped with fresh orange segments.
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  • wiggly lines on the body continue into the two largest segments of the ' X ' .
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  • This remark applies to the finding of the area of a parabolic segment (mechanical solution) and of a spiral, the surface and volume of a sphere and of a segment thereof, and the volume of any segments of the solids of revolution of the second degree.
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  • The second book is in nine propositions, eight of which deal with segments of spheres and include the problems of cutting a given sphere by a plane so that (a) the surfaces, (b) the volumes, of the segments are in a given ratio (Props.
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  • 2 g) with two or three segments.
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  • Most remarkable in this order is the structure of the feet; there are never more than two tarsal segments, and the claws, usually so conspicuous in insect feet, are reduced (fig.
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