Reagent Sentence Examples

The colourproducing reagent is added and the tints compared.

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.

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.

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.

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.

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.

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.

A significant fraction of the oxy radical also reacts via hydrogen atom abstraction from the added reagent.

The profile of cross-reaction with wheat germ agglutinin, used here as a general carbohydrate reagent, is shown in vacuum blots.

If the Schiff's reagent quickly becomes magenta, then you are producing an aldehyde from a primary alcohol.

Each batch included a reagent blank, and reference soy sauces containing approximately 0.005 and 0.1 mg/kg 1,3-DCP.

This is then placed on a reagent strip, which is usually read by a small, electronic blood glucose meter.

Tests with anti-human globulin reagents 1 For each anti-human globulin reagent, prepare 2 sets of 6 tubes.

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.

The specificity of the reagent for blood group serology should be of a print size which is clearly legible.

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.

All data were corrected for spike recovery using spiked reagent blanks.

The diabetes nurse specialist taught her to test her blood glucose using reagent strips.

In direct contrast, perfect replication of the membrane structure was achieved at low reagent concentrations.

Reverse grouping should be performed using A 1 and B reagent red cells.

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.

The second drop is applied to the dry reagent test strip or device.

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.

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.

All other metals, including palladium, are dissolved as nitrates, the oxidizing part of the reagent being generally reduced to oxides of nitrogen.

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.

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.

The excess of reagent is removed by evaporation and a small quantity of a ferric salt added, when a deep red colour is produced.

On account of the readiness with which it condenses with various compounds, benzaldehyde is an important synthetic reagent.

In preparing the Grignard reagent the commencement of the reaction is accelerated by a trace of iodine.

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.

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.

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.

At elevated temperatures the metal decomposes nearly all other metallic oxides, wherefore it is most serviceable as a metallurgical reagent.

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.

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.

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.

Potash soap with the same reagent undergoes double decomposition - a proportion being changed into a soda soap with the formation of potassium chloride.

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.