Since the oxidation of NH{3} is the only source of chemical energy which the nitrifying organism can use it was clear a priori that the yield in assimilation must correspond to the quantity of oxidized nitrogen.
The nitrifying organisms first produce nitrous acid products (nitrites), and in the further development of the nitrifying process these are changed to nitrates.
The other two kinds are the true nitrifying bacteria.
Now, the nitrifying bacteria require certain conditions, otherwise they will not perform their functions.
I am glad that the nitrogen-fixing and nitrifying bacteria do business chicfly in the surface soil, because we are not prepared to correct the acidity to any very great depth.
Thus these nitrifying organisms form the last link in the chain that binds the animal kingdom to the vegetable kingdom (Fig.
In the soil everywhere, especially in fertile soil, is a class of bacteria which has received the name of nitrifying bacteria (Fig.
It would appear, therefore, that in a clay soil the nitrifying organism is confined to about 18 inches from the surface; it is most abundant in the first 6 inches.
It appeared of interest to ascertain to what extent nitrification would proceed in a dilute solution of urine without the addition of any substance save the nitrifying ferment.
The nitrifying organism has been submitted as yet to but little microscopical study; it is apparently a micrococcus.
Besides solutions containing ammonium salts and urea, I have succeeded in nitrifying solutions of asparagine, milk, and rape cake.
The heating of soil to the same temperature effectually destroys its nitrifying power.
Three series of experiments have been made on the distribution of the nitrifyingorganism in the clay soil and subsoil at Rothamsted.
The Distribution of theNitrifying Organism in the Soil.
The quantity of nitrifyingorganism present has also a marked effect.
The nitrifyingorganisms are also found in river-water, in sewage, and well-waters.
To this class of organism the nitrifying organisms belong.
Among these phosphoric acid is one of the most important, and in the experiments on nitrification it has been found that the nitrifying organisms will not develop in any medium destitute of it.
These forms are universally present in nitrifying cultures.
Distribution of the Nitrifying Organisms in the Soil.
Ammonia and other nitrogenous bodies undergo in the soil, through the agency of nitrifying organisms present in it (Bacterium nitrificans, &c.
The breaking down of the humus and building of the nitrogen into other substances is the work of another set of bacteria or germs called nitrifying germs.
The work of the nitrifying germs is called nitrification.
This, we have learned, is done through the aid of the nitrifying germs.
This allows the nitrogen of the nitrates to escape as a free gas into the air again, and the work of the nitrogen-fixing and nitrifying germs is undone and the nitrogen is lost.
The nitrifying germs require phosphoric acid, potash and lime in the soil.
These nitrifying germs attack the humus, break it down, separate the nitrogen, cause it to unite with the oxygen of the air and thus build it into nitric acid which can be used by plant roots.
To do their work well the nitrogen-fixing germs and the nitrifying germs require certain conditions.
The soil must be well ventilated to supply nitrogen for the nitrogen-fixing germs and oxygen for the nitrifying germs.
Like the nitrifying germs they need oxygen, and when they cannot get it more readily elsewhere they take it from the nitric acid and nitrates.
It was soon learned that the nitrous organism, even when obtainable in large quantities and in pure culture, was not able entirely to complete the nitrifying process.
The nitrifying organism can act at a temperature as low as 37° or 39° F.
Müntz's criticism that the nitrifying organisms only oxidise from nitrogenous matter to nitrites, and not from nitrites to nitrates.
Just as we observed that there were few denitrifying organisms which could break down ammonia compounds to nitrogen gas, so is it also true that there are few nitrifying bacteria which can build up from ammonia to the nitrates.
Like the other nitrifying bacteria, its development and action are favoured by the presence of the acid carbonates of calcium and sodium.
But even the adoption of this isolating method seemed to give no better results, and for an excellent reason: the nitrifying organisms will not grow on gelatine.
It has already been pointed out that the nitrifying bacteria, though able to live on organic matter, do not require such either for existence or for the performance of their function.
Sand filtration, plus a "nitrifying layer," will remove more than 90 per cent.
Winogradsky prepared vessels and solutions carefully purified from organic matter, and these solutions he sowed with the nitrifying organism, and found that they flourished.
This oxidation is performed by thenitrifying microorganisms, and the process is known as nitrification.
To maintain this nitrifying action of a filter in efficiency, Koch suggested, in the second place, that the rate of filtration must not exceed four inches per hour.
A very hot pile leaking ammonia may contain too little soil, but more likely it is also so hot that the nitrifying bacteria have been killed off.
Beyerinck has shown that Spirillum desulphuricans, a definite anaerobic form, attacks and reduces sulphates, thus undoing the work of the sulphur bacteria as certain de-nitrifying bacteria reverse the operations of nitro-bacteria.
It is probable that important consequences of these actions result from the presence of nitrifying bacteria in rotten stone, decaying bricks, &c.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nitrifying" in a variety of sentences. We hope that you will now be able to make sentences using this word.
