Living organisms nitrogen

Different roles in aquatic ecosystems, from acting as nutrients for living organisms (nitrogen and phosphorus compounds) to exerting toxic effects on such organisms (arsenic and mercury). 

Nutrients—these are elements essential to the metabolism of living organisms. Nitrogen, phosphorus, and silicon are the most important and commonly studied nutrients in aquatic ecosystems. 

Nitrogen is an odourless, eolourless gas whieh eomprises ea 79% by volume of air and is an essential eonstituent of all living organisms, e.g. as protein. It is made in the laboratory by gently... 

Carbon-12 is the principal isotope of carbon, but a small proportion of carbon-14 is present in all living organisms. Its nuclei are produced when nitrogen nuclei in the atmosphere are bombarded by neutrons formed in the collisions of cosmic rays with other nuclei ... 

Moreover, the lipo-chitooligosaccharides, also known as nod factors, permit nitrogen fixation by which plants and symbiotic Rhizobia bacteria can reduce atmospheric nitrogen to the ammonia that is utihzed by the plant, thus making available nitrogen compounds to other living organisms. 

The consumables represent the essential food or nutritional reqirirements. Conventionally they include sugars, starches, proteins, vitamins, trace elements, oxygen, carbon dioxide and nitrogen but bacteria are probably the most omnivorous of all living organisms and to the above list may be added plastic, mbber, kerosene, naphthalene, phenol and cement. One is left feeling that there is no substance which is immune to microbial... 

Nitrogen. Nitrogen, a colorless, odorless, and tasteless gaseous element, is the main component of the atmosphere, which makes up about 78% of its volume since it is also an important constituent of living organisms,... 

As the one of the main end products of protein metabolism in living organisms, urea is a primary source of organic nitrogen in soil (from animal urine, fertilizers, etc.). Monitoring the level of urea is important for medicine, as well as for environmental protection. Urease is an enzyme that breaks the carbon-nitrogen bond of amides to form carbon dioxide, ammonia and water. This enzyme is widely used for determination of urea in... 

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