nitrifying bacteria

Scientific  

/ nī′trə-fī′ĭng /

1. Any of various soil bacteria that change ammonia or ammonium into nitrite or change nitrite into nitrate as part of the nitrogen cycle. Bacteria of the genus Nitrosomonas are the primary converters of ammonium into nitrite (which is actually toxic to plants), and bacteria of the genus Nitrobacter oxidize the nitrite to form nitrate ions (which are readily absorbed and usable by plants). Most of the nitrogen contained in fertilizer is made available to plants by these bacteria.

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Example Sentences

Called brachialactone, it reduces nitrous oxide emissions by blocking enzymatic pathways in nitrifying bacteria.

From Nature

By the action of nitrifying bacteria on this organic matter, nitrate salts are believed to have formed which were leached out by surface and ground waters, and probably carried in solution to enclosed bodies of water.

From Project Gutenberg

The discoveries that some species of nitrifying bacteria and Function and life of bacteria. perhaps pigmented forms are capable of carbon-assimilation, that others can fix free nitrogen and that a number of decompositions hitherto unsuspected are accomplished by Schizomycetes, have put the questions of nutrition and fermentation in quite new lights.

From Project Gutenberg

It is probable that important consequences of these actions result from the presence of nitrifying bacteria in rotten stone, decaying bricks, &c., where all the conditions are realized for preparing primitive soil, the breaking up of the mineral constituents being a secondary matter.

From Project Gutenberg

Fresh manure abounds in de-nitrifying bacteria, and these organisms not only reduce the nitrates to nitrites, even setting free nitrogen and ammonia, but their effect extends to the undoing of the work of what nitrifying bacteria may be present also, with great loss.

From Project Gutenberg