Homologues Sentence Examples

In order to obtain the phenol from this distillate, it is treated with caustic soda, which dissolves the phenol and its homologues tegether with a certain quantity of naphthalene and other hydrocarbons.

Substitution of the Benzene Ring.-As a general rule, homologues and mono-derivatives of benzene react more readily with substituting agents than the parent hydrocarbon; for example, phenol is converted into tribromphenol by the action of bromine water, and into the nitrophenols by dilute nitric acid; similar activity characterizes aniline.

The head is rather large, and is furnished at first with five simple eyes of nearly equal size; but as it increases in size the homologues of the facetted eyes of the imago become larger, whereas those equivalent to the ocelli remain small.

When methyl iodide is used, nitromethane is the sole product, but the higher homologues give more or less of the isomeric nitrous esters.

In 1877, with Crafts, he made the first publication of the fruitful and widely used method for synthesizing benzene homologues now generally known as the "Friedel and Crafts reaction."

Acridine and its homologues are very stable compounds of feebly basic character.

They are of importance, since the higher homologues are identical in many cases with the ptomaines produced by the putrefactive action of some bacteria on albumen and other related substances.

Methane and its homologues give origin to the " paraffin " or " fatty series " of the general formula C,H 2, ,+ 1 000H, ethylene gives origin to the acrylic acid series, C n H 27, - 1 000H, and so on.

The poison is secreted in modified upper labial glands, or in a pair of large glands which are the homologues of the parotid salivary glands of other animals.

The male forms, which are very small and the homologues of the microgametes developed in the blood, appear to die off soon.

The calcium salt, when heated with the calcium salts of higher homologues, gives aldehydes.

They are the homologues of the scrotum in the male.

As a synthetical agent in organic chemistry, aluminium chloride has rendered possible more reactions than any other substance; here we can only mention the classic syntheses of benzene homologues.

A 2.6 naphthoquinone results on oxidizing 2.6 dihydroxynaphthalene with lead Or Hydroxynaphthalenes, C 1 oH 7 OH, the naphthalene homologues of the phenols.

The variability of structures which are repeated in the body of the same individual (serial homologues) has been studied by Pearson and his pupils with important results.

The simplest of such repeated elements are the cells of the tissues, more complex are cell-aggregates, from hairs, scales, teeth and the like, up to limbs or metameres in animals, or the .00 '00 leaves and their homologues in plants.

The correlation between undifferentiated sets of serial homologues, produced by a single individual, is the measure of what Pearson has called homotyposis.

Considerable interest is attached to the remarkable series of hydrocarbons obtained by Gomberg (Ber., 1900, 33, p. 3150, et seq.) by acting on triphenylmethane chloride (from triphenylmethane carbinol and phosphorus pentachloride, or from carbon tetrachloride and benzene in the presence of aluminium chloride) and its homologues with zinc, silver or mercury.

Homologues of cocaine - ethylbenzoylecgonine, &c. - have been prepared; they closely resemble natural cocaine.

It also occurs with pyridine and its homologues in bone-oil.

The reaction is a perfectly general one, for the aniline may be replaced by other aromatic amines and the aldehyde by other aldehydes, and so a large number of quinoline homologues may be prepared in this way.

It may be obtained synthetically by Fittig and Tollens's method (above); by Friedel and Craft's process, devised in 1877, of acting with aluminium chloride on a mixture of benzene and methyl chloride; this reaction leads to the production of higher homologues which may, however, break down under the continued action of the aluminium chloride; or by heating the toluene carboxylic acids obtained by oxidizing the higher homologues of benzene.

In 1855 Adolph Wurtz had shown that when sodium acted upon alkyl iodides, the alkyl residues combined to form more complex hydrocarbons; Fittig developed this method by showing that a mixture of an aromatic and alkyl haloid, under similar treatment, yielded homologues of benzene.

The thiophen ketones may be prepared by the interaction of thiophen and its homologues with acid chlorides in the presence of anhydrous aluminium chloride.

This indicates a common ancestry, although no TTSS sequence homologues for the genes encoding the flagellum are found.

Aeromonas salmonicida possesses two genes encoding homologues of the major outer membrane protein, OmpA.

We have identified homologues of the gene CYCLOIDEA that has been shown to be involved in setting floral symmetry in snapdragon flowers.

This means that there is high confidence in the representative list containing no homologues.

Ms Collins has cloned eucalyptus homologues of genes that control flower induction in Arabidopsis.

This expression pattern in adults is distinct from any of the putative mammalian homologues.

If human homologues of the genes that we find in the worm play a similar role in signaling, they are candidate cancer genes.

From bacterial to human models The majority of membrane protein structures are of bacterial homologues of membrane proteins.

The latter are rather more distant homologues of KcsA.

Special forms of MEROPS ID are used for unassigned peptidases, non-peptidase homologues and unsequenced peptidases.

Carbolic acid, and liquid preparations of carbolic acid and its homologues containing more than 3% of those substances, except preparations for use as sheep-wash or for any other purpose in connexion with agriculture or horticulture, contained in a closed vessel distinctly labelled with the word " poisonous," the name and address of the seller, and a notice of the special purposes for which the preparations are intended.