Reagent sentence example

reagent
  • The ordinary ammonium molybdate, used as a test reagent for phosphates, is a salt of composition (NH4)10M012041; it has been examined physicochemically by J.
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  • Acetoacetic ester is a most important synthetic reagent, having been used in the production of pyridines, quinolines, pyrazolones, furfurane, pyrrols, uric acid, and many complex acids and ketones.
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  • These may be divided into two groups: (I) those in which a change in appearance of the reacting mixture occurs; (2) those in which it is necessary to use an indicator which, by its change in appearance, shows that an excess of one reagent is present.
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  • Various hydrates have been described, but they cannot be formed by precipitating a uranyl salt with an alkali, this reagent giving rise to salts termed uranates.
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  • The colourproducing reagent is added and the tints compared.
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  • The reagents in common use are: Millon's reagent, a solution of mercuric nitrate containing nitrous acid, this gives a violet-red coloration; nitric acid, which gives a yellow colour, turning to gold when treated with ammonia (xanthoproteic reaction); fuming sulphuric acid, which gives violet solutions; and caustic potash and copper sulphate, which, on warming, gives a red to violet coloration (biuret reaction).
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  • The mother liquor includes generally more or less of nickel, cobalt, zinc and other heavy metals, which, as Wailer showed, can be removed as insoluble sulphides by the addition of ammonium sulphide; uranium, under the circumstances, is not precipitated by this reagent.
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  • Solutions of uranyl salts (nitrate, &c.) behave to reagents as follows: sulphuretted hydrogen produces green uranous salt with precipitation of sulphur; sulphide of ammonium in neutral solutions gives a black precipitate of UO 2 S, which settles slowly and, while being washed in the filter, breaks up partially into hydrated UO 2 an sulphur; ammonia gives a yellow precipitate of uranate of ammonia, characteristically soluble in hot carbonate of ammonia solution; prussiate of potash gives a brown precipitate which in appearance is not unlike the precipitate produced by the same reagent in cupric salts.
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  • Stannous salt solutions yield a brown precipitate of SnS with sulphuretted hydrogen, which is insoluble in cold dilute acids and in real sulphide of ammonium, (NH 4) 2 S; but the yellow, or the colourless reagent on addition of sulphur, dissolves the precipitate as SnS 2 salt.
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  • All other metals, including palladium, are dissolved as nitrates, the oxidizing part of the reagent being generally reduced to oxides of nitrogen.
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  • and then further oxidizing this with Fenton's reagent, i.e.
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  • The German regulations are apparently based on a keen appreciation of the fact that while one particular denaturizing agent may have little or no effect on one industry, yet it would be quite fatal to the success of another; there is consequently a great choice of denaturizing agents, and in certain cases it is sufficient to mix the alcohol with a reagent necessary for the purpose in hand, or even with a certain amount of the final product, it being only necessary to satisfy the state that the spirit is not available as a beverage.
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  • Shenstone, two classes are to be recognized: (I) Nataloins, which yield picric and oxalic acids with nitric acid, and do not give a red coloration with nitric acid; and (2) Barbaloins, which yield aloetic acid, C7H2N205, chrysammic acid, C 7 H 2 N 2 0 6, picric and oxalic acids with nitric acid, being reddened by this reagent.
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  • 3, p. 319.) Ammonia finds a wide application in organic chemistry as a synthetic reagent; it reacts with alkyl iodides to form amines, with esters to form acid amides, with halogen fatty acids to form amino-acids; while it also combines with isocyanic esters to form alkyl ureas and with the mustard oils to form alkyl thioureas.
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  • Bamberger), and by the action of the Grignard reagent on quinones (Bamberger).
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  • It crystallizes in dark red prisms which are readily soluble in water; it is a valuable reagent for the detection of sulphur, this element when in the form of an alkaline sulphide giving a characteristic purple blue coloration with the nitroprusside.
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  • The excess of reagent is removed by evaporation and a small quantity of a ferric salt added, when a deep red colour is produced.
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  • On account of the readiness with which it condenses with various compounds, benzaldehyde is an important synthetic reagent.
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  • The products formed by the action of the Grignard reagent with the various types of organic compounds are usually thrown out of solution in the form of crystalline precipitates or as thick oils, and are then decomposed by ice-cold dilute sulphuric or acetic acids, the magnesium being removed as a basic halide salt.
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  • On passing a current of dry carbon dioxide over the reagent,- the gas is absorbed and the resulting compound, when decomposed by dilute acids, yields an organic acid, and similarly with carbon oxysulphide a thio-acid is obtained: RMgX-R CO 2 MgX?R CO 2 H; COS-CS(OMgX) R--R Csoh.
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  • A solution of iodine is also used as a test owing to the blue or wine-red colour which the thallus, hymenium or spores may give with this reagent.
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  • Alumina itself is so refractory that it cannot be melted save by the oxyhydrogen blowpipe or the electric arc, and except in the molten state it is not susceptible of decomposition by any chemical reagent.
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  • At elevated temperatures the metal decomposes nearly all other metallic oxides, wherefore it is most serviceable as a metallurgical reagent.
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  • This solution is frequently used as a test reagent for the detection of aldehydes, giving, in most cases, a red coloration on the addition of a small quantity of the aldehyde.
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  • In preparing the Grignard reagent the commencement of the reaction is accelerated by a trace of iodine.
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  • Sometimes it is necessary to allow the solution to stand for a considerable time either in the warm or cold or in the light or dark; to work with cold solutions and then boil; or to use boiling solutions of both the substance and reagent.
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  • Soc., 1904, 20, p. 15) has used silicon halides with the Grignard reagent: C2H,MgBr(+SiC14)-C2HiSiC13(-1-MgBrPh)--> Ph C 2 H 1.
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  • On treatment with the Grignard reagent, in absolute ether solution, they yield addition products which are decomposed by water with production of tertiary alcohols (V.
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  • With the Grignard reagent, they form addition compounds which on the addition of water yield tertiary alcohols, except in the case of ethyl formate, where a secondary alcohol is obtained.
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  • Sulphuretted hydrogen, in the presence of free mineral acid, gives no precipitate; sulphide of ammonium, from neutral solutions, precipitates T12S as a dark brown or black precipitate, insoluble in excess of reagent.
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  • Both the oxide and hydroxide dissolve in ammonia to form a beautiful azure-blue solution (Schweizer's reagent), which dissolves cellulose, or perhaps, holds it in suspension as water does starch; accordingly, the solution rapidly perforates paper or calico.
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  • It is necessary in the first place, after the ore is in solution, to reduce all the iron to the ferrous condition; then the carefully standardized solution of the oxidizing reagent is added until all the iron is in the ferric state, the volume of the standard solution used being the measure of the iron contained in the ore.
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  • a component is absorbed by a suitable reagent and the diminution in volume noted, or it is absorbed in water and the amount determined by titration with a standard solution.
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  • Derivatives of the type R 2 N OH result in the action of the Grignard reagent on amyl nitrite.
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  • A significant fraction of the oxy radical also reacts via hydrogen atom abstraction from the added reagent.
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  • The profile of cross-reaction with wheat germ agglutinin, used here as a general carbohydrate reagent, is shown in vacuum blots.
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  • If the Schiff's reagent quickly becomes magenta, then you are producing an aldehyde from a primary alcohol.
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  • antiserum production in support of ongoing requirements for reagent antibody production, research and development.
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  • Each batch included a reagent blank, and reference soy sauces containing approximately 0.005 and 0.1 mg/kg 1,3-DCP.
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  • fluorescest is a blocker, the second the tissue or blood sample under test and the third, a fluorescing reagent dye.
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  • Tests with anti-human globulin reagents 1 For each anti-human globulin reagents 1 For each anti-human globulin reagent, prepare 2 sets of 6 tubes.
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  • reagent B lymphocytes isolated for the identification of class II antibodies should contain less than 10% of non-B cells.
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  • This is then placed on a reagent strip, which is usually read by a small, electronic blood glucose meter.
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  • pipette tip should be used for each reagent.
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  • UC-add reagent: Add a new reagent to PIMS Summary: A user will need to record the details of new reagents.
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  • reagent blanks.
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  • reagent strips.
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  • reagent concentrations.
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  • reagent red cells.
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  • Tests with anti-human globulin reagents 1 For each anti-human globulin reagent, prepare 2 sets of 6 tubes.
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  • Determine the light chain reactivity of the test anti-IgG reagent by comparison with the reactivity of the anti-IgG preparations of known anti-light chain activity.
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  • The specificity of the reagent for blood group serology should be of a print size which is clearly legible.
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  • wheat germ agglutinin, used here as a general carbohydrate reagent, is shown in vacuum blots.
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  • If in this sentence he scarcely does justice to the powers of logical inference and inductive reasoning displayed in much of his work, it remains true that blind experiment - heating a substance, or treating it with some reagent, to see what would happen - was his characteristic method of inquiry.
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  • In the case of copper, the colour reactions with potassium ferrocyanide or ammonia are usually employed; traces of ammonia are estimated with Nessler's reagent; sulphur in iron and steel is determined by the tint assumed by a silver-copper plate suspended in the gases liberated when the metal is dissolved in sulphuric acid (Eggertz's test) (see W.
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  • They may also be prepared by the decomposition of ketone chlorides with water; by the oxidation of the tertiary hydroxyacids; by the hydrolysis of the ketonic acids or their esters with dilute alkalis or baryta water (see Aceto-Acetic Ester); by the hydrolysis of alkyl derivatives of acetone dicarboxylic acid, HO 2 C CH 2 CO CHR CO 2 H; and by the action of the Grignard reagent on nitriles (E.
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  • UC-Add reagent: Add a new reagent to PIMS Summary: A user will need to record the details of new reagents.
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  • All data were corrected for spike recovery using spiked reagent blanks.
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  • The diabetes nurse specialist taught her to test her blood glucose using reagent strips.
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  • In direct contrast, perfect replication of the membrane structure was achieved at low reagent concentrations.
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  • Reverse grouping should be performed using A 1 and B reagent red cells.
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  • Dipstick or reagent test strips that measure glucose in the urine can only detect glucose levels above 180 mg/dl and are non-specific, so they are not useful in the diagnosis of diabetes.
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  • The second drop is applied to the dry reagent test strip or device.
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  • It is a most important synthetic reagent; with sodium or sodium ethylate it forms sodio-malonic ester, which reacts readily with alkyl halides, forming alkyl malonic esters, which are again capable of forming sodium derivatives, that by further treatment with alkyl halides yield the di-alkyl malonic esters.
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  • Potash soap with the same reagent undergoes double decomposition - a proportion being changed into a soda soap with the formation of potassium chloride.
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  • In quantitative analysis the methods can be subdivided into: (a) gravimetric, in which the constituent is precipitated either as a definite insoluble compound by the addition of certain reagents, or electrolytically, by the passage of an electric current; (b) volumetric, in which the volume of a reagent of a known strength which produces a certain definite reaction is measured; (c) colorimetric, in which the solution has a particular tint, which can be compared with solutions of known strengths.
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  • (a) Gravimetric. - This method is made up of four operations: (I) a weighed quantity of the substance is dissolved in a suitable solvent; (2) a particular reagent is added which precipitates the substance it is desired to estimate; (3) the precipitate is filtered, washed and dried; (4) the filter paper containing the precipitate is weighed either as a tared filter, or incinerated and ignited either in air or in any other gas, and then weighed.
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