Ammonia and indol tests shall be made at end of tenth day, nitrite tests at end of fifth day.
Liquid media such as broth, milk, litmus milk, indol and nitrate broths are used in the above-mentioned tubes when small quantities only are to be worked with.
Dunham's peptone solution=, frequently used to determine indol production, is a solution of 1 per cent.
In the study of pathogenic bacteria the coagulation and digestion of milk, the digestion or liquefaction of blood serum, the liquefaction of gelatin and the production of indol and H{2}S are those usually tested for.
Indol and skatol are amongst the final products of digestion in the lower intestine.
Indol may be recognised on account of the fact that with nitrous acid it produces a dull red colour.
Fermentation of sugar, coagulation of milk, or indeed the indol reaction cannot always be used as final tests as to whether or not the organism is B.
Hence the indol test may be applied by simply adding to the peptone culture several drops of strong sulphuric acid, when in the course of several hours, if not at once, there will be produced a pink colour, the "cholera red reaction.
The presence ofindol is indicated by the appearance of a delicate rose-pink colour throughout the mixture which deepens slightly on standing.
Indol is tested for in many laboratories by the ordinary nitrosoindol reaction which, however, is not so delicate a method as that above described.
Test for indolby means of the Rosindol reaction in the following manner.
A rose-pink or red colour at the junction of the two liquids = indol (plus a nitrite).
If both indoland phenol appear to be present in cultivations of the same organism, it is well to separate them before testing.
Nencki prepared it by the oxidation of indol by ozone.
Indol had been previously obtained from albuminoids by means of the pancreas ferment.
Thus, by cultivating the lactic bacillus in the presence of those microbes which produce poisons belonging to the aromatic group, the decrease in quantity and even the disappearance of phenol and indol is observed.
Products of decomposition, chiefly indol and skatol, are responsible for the normal offensive odor.
Indol is absorbed and oxidized into indoxyl, which combines with potassium and sulphuric acid and is thus excreted.
Chemically, it is indoxyl sulphate of potash, C8H6NSO4K, and is derived from the indolformed in the alimentary canal.
Defn: A white crystalline nitrogenous substance (C8H7NO) of the indol group, obtained by the reduction of dioxindol.
It is a member of the indol series; -- hence its name.
In my tests here to-day, I injected four one-hundredths of a grain of indolinto a guinea-pig.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "indol" in a variety of sentences. We hope that you will now be able to make sentences using this word.
