Boil a small portion of the albumen solution in a test tube, adding drop by drop dilute acetic acid (two per cent) until a flaky coagulum of insoluble albumen separates.
Place some Fehling solution (which can be readily obtained at the drug store as a solution, or tablets may be bought which answer the same purpose) in a test tube, and boil.
Shake up a little flour with ether in a test tube, with a tight-fitting cork.
Take one or two teaspoonfuls of fresh milk in a test tube; heat it, and add a small quantity of extract of rennet.
The glass tube may be a test tube, as shown in Fig.
Insert the short end of the tube in the cork and place the other end in a test tubethat is placed in water as shown.
How to Make a Simple Still [170] A still to distill water can be made from a test tube, some heavy rubber hose, and an ordinary bottle.
Mix half a teaspoonful of corn-starch or flour with cold water in a test tube or glass cup.
Put 1/2 teaspoonful of salt in a test tube, half fill it with water.
Repeat this operation until you can judge with a fair degree of accuracy the part of a test tube filled by 5 cc.
A test tube is partially filled with a ten per cent solution of sulphate of copper, and several copper wires are dipped into it to form an anode.
Another test for bile consists in pouring a little of the suspected urine into a test tube, and adding to it a few drops of tincture of iodine, when if bile be present the fluid becomes distinctly green.
The two great classes of organic bodies (azotised and non-azotised) are readily distinguished from each other by heating a small portion with some solid hydrate of potassium, in a test tube.
Calvert and Davies obtained chloric peroxide without the least danger by heating a mixture of oxalic acid and potassium chlorate in a test tube in a water-bath.
LEMON OIL The presence of lemon oil may be detected by adding a large excess of water to a small amount of the extract in a test tube.
When cool dilute with water, add an excess of ammonia, and place in a narrow vessel like a test tube.
Put a wad of zinc shavings, about the size of the end of your little finger, into the bottom of a test tube.
Pour alcohol into a test tube (square-bottomed test tubes are best for this experiment), standing the tube up beside a ruler.
If we boil water with a piece of laundry starch in a test tube, then cool it and add to the mixture two or three drops of iodine solution,[3] we find that the mixture in the test tube turns purple or deep blue.
Pour some soft celloidin into a test tube; carefully revolve the test tube so that an even film of celloidin dries on the inside.
Place any green water plant in a battery jar partly filled with water, cover the plants with a glass funnel and mount a test tube full of water over the mouth of the funnel.
Add to a little albumen in a test tube some 95 per cent alcohol and notice what happens.
Pour ten drops into a test tube; add three or four drops of hydrochloric acid.
When it is certain that all is collected, the mercury may be carefully transferred to a small porcelain cup or test tube, and boiled with strong nitric acid, which must be pure.
Silver ore may be detected by dissolving a small quantity in a test tube with a few drops of nitric acid.
A sample of foul-smelling Limulus blood full of bacteria will become colorless on standing in a test tube for 10 to 15 minutes, but the blue color quickly returns if shaken with air.
Given a test tube of luciferase solution containing, as it does, oxyluciferin, add some Zn dust or Mg powder, and the evolution of hydrogen begins.
But a test tube of quinine sulphate solution held in the ultra-violet region of a spectrum will glow with a pale blue light, although it is not illuminated with any rays that are visible to our eyes.
But even were this the case, it is an unjustifiable inference that living tumor cells would be influenced in anything like the same manner as are the dead cells observed in test tube experiments.
But the fact that a compound is a germicide when brought into intimate contact with bacteria in a solution or medium in a test tube or flask does not prove that it will be effective when used in the human throat.
The newspaper article showed the learned doctor in a laboratory apron in the characteristic pose of the newspaper “scientist” pouring something from a beaker into a test tube--and gazing intently at the camera while doing it!
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "test tube" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
