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*  Isotopic signature
For example, in arid regions, the nitrogen cycle tends to be more 'open' and prone to the loss of 14N, increasing δ15N in soils ... Nitrogen-15 tracing is an important method used in biogeochemistry. The ratio of stable nitrogen isotopes, 15N/14N or δ15N, ... Nitrogen-15 is extensively used to trace mineral nitrogen compounds (particularly fertilizers) in the environment. When ... Nitrogen-15, or 15N, is often used in agricultural and medical research, for example in the Meselson-Stahl experiment to ...
*  Nitrification
... with the release of available nitrogen compounds. This replenishes the nitrogen cycle. Nitrification is a process of nitrogen ... so the nitrogen cycle in the ocean is of particular interest. The nitrification step of the cycle is of particular interest in ... Nitrogen cycle of the open ocean: from genes to ecosystems. Annu. Rev. Mar Sci. 3:197-225. Czapar, G; Payne, J; Tate, J. An ... Nitrogen cycle of the open ocean: from genes to ecosystems. Annu. Rev. Mar Sci. 3:197-225. Nitrification and Denitrification: ...
*  Cattle urine patches
Nitrous oxide is subsequently reduced to dinitrogen, the key product of the nitrogen cycle. Nitrous oxide is merely a free ... Nitrification and denitrification are two microbial processes that are part of the nitrogen cycle. While denitrification ... "Human Alteration of the Global Nitrogen Cycle: Source and Consequences". Ecological Applications. Ecological Society of America ... Nitrogen concentration of cattle urine varies between approximately 3.0 and 10.5 g/L. Although many nitrogenous constituents ...
*  Nitrogen cycle
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates ... in areas with nitrogen-rich bedrock, the breakdown of this rock also serves as a nitrogen source. The nitrogen cycle is an ... and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle. Nitrogen is present in the ... While the overall cycle is similar, there are different players and modes of transfer for nitrogen in the ocean. Nitrogen ...
*  Lichens and nitrogen cycling
The nitrogen cycle is one of the Earth's biogeochemical cycle that involves the conversion of nitrogen into different chemical ... That means that at in some regions, the biogeochemical cycle (including nitrogen cycle and carbon cycle) is unlikely to run ... Two main nitrogen stress factors for lichens are nitrogen deficiency and high nitrogen deposition.Both types of nitrogen stress ... Nitrogen, as a macronutrient and a biogeochemical cycle, also affects the ecology. Through the nitrogen cycle, it breaks down ...
*  Human impact on the nitrogen cycle
"Nitrogen saturation in northern forest ecosystems". Bioscience 39:378-386 Aber, J. D. (1992). "Nitrogen cycling and nitrogen ... Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently ... Nitrogen effects on biodiversity, carbon cycling, and changes in species composition have also been demonstrated. In highly ... As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past ...
*  Nitrite reductase (NO-forming)
Ferguson SJ (1998). "Nitrogen cycle enzymology". Curr. Opin. Chem. Biol. 2 (2): 182-193. doi:10.1016/S1367-5931(98)80059-8. ... This enzyme participates in nitrogen metabolism. It has 3 cofactors: FAD, Iron, and Copper. As of late 2007, 20 structures have ...
*  John Postgate (microbiologist)
... the Nitrogen Cycle; Terrestrial Microbiology; Scientists' Archives; and Genetic engineering. Having been on the Council of the ... A Plain Man's Guide To Jazz Nitrogen Fixation The Sulphate-reducing Bacteria Microbes and Man The Outer Reaches of Life A ... Postgate, John; "The Origins of the Unit of Nitrogen Fixation at the University of Sussex", Notes and Records of the Royal ... One of the Unit's plasmids came into worldwide use to study the genetics of nitrogen fixation. The Unit's reputation prospered ...
*  Nitrospira
... is an ubiquitous bacterium that plays a role in the nitrogen cycle by performing nitrite oxidation in the second ... The discovery of Commamox organisms within Nitrospira redefine the way bacteria contribute to the Nitrogen cycle and thus a lot ... Nitrogen cycle Fujitani, Hirotsugu; Ushiki, Norisuke; Tsuneda, Satoshi; Aoi, Yoshiteru (October 2014). "Isolation of sublineage ...
*  C. Vernon Cole
Phosphorus effects on terrestrial nitrogen cycling. In: F.E. Clark, and T. Rosswall, (eds.). Terrestrial nitrogen cycles. Ecol ... Dynamics and interactions of carbon, nitrogen, phosphorus and sulphur cycling in grazed pastures. Pages 1420-1421 in ... Biological aspects of the phosphorus cycle. In H. Tiessen (ed.) Phosphorus Cycles in Terrestrial and Aquatic Ecosystems. ... Simulation of phosphorus cycling in semiarid grasslands. Ecology 58(1):1-15. Cole, C.V., E.T. Elliott, H.W. Hunt, and D.C. ...
*  Denitrifying bacteria
This loss of nitrogen to the atmosphere can eventually be regained via introduced nutrients, as part of the nitrogen cycle. ... Nitrifying bacteria Nitrogen Cycle Zumft, W. G. (1997). Cell biology and molecular basis of denitrification. Microbiology and ... Bothe, H., Ferguson, S., & Newton, W. (2007). Biology of the nitrogen cycle. Amsterdam: Elsevier.. ... The most common denitrification process is outlined below, with the nitrogen oxides being converted back to gaseous nitrogen: 2 ...
*  Nitrous-oxide reductase
Bothe H (2006). Biology of the Nitrogen Cycle. Elsevier Science. ISBN 978-0-444-52857-5. Zumft WG (January 2005). "Nitric oxide ... In enzymology, a nitrous oxide reductase also known as nitrogen:acceptor oxidoreductase (N2O-forming) is an enzyme that ... Nitrous oxide, its production and reduction to nitrogen". J Biochem. 64 (6): 863-71. PMID 5718551. Kristjansson JK, Hollocher ... "Enzymes and associated electron transport systems that catalyse the respiratory reduction of nitrogen oxides and oxyanions". ...
*  Nitrite reductase
"Diversity in the Nitrogen Cycle". In Golterman HL. Denitrification in the Nitrogen Cycle. New York: Plenum Press. p. 56. ISBN 0 ... The interactions lengthen the N-O bonds and facilitate cleavage of an oxygen from nitrogen. The Fe-NO bond is linear and has ... The oxidation of iron from Fe(II) to Fe(III), coupled with a further protonation of nitrogen leads to the release of ammonia. ... The Cu is bound by nitrogens of two Histidines from one monomer, and bound by one Histidine from another monomer; the Cys-His ...
*  Legume
"The Nitrogen cycle and Nitrogen fixation". Institute of Cell and Molecular Biology, The University of Edinburgh. Retrieved ... These bacteria have the special ability of fixing nitrogen from atmospheric, molecular nitrogen (N2) into ammonia (NH3). The ... Nitrogen is therefore a necessary ingredient in the production of proteins. Hence, legumes are among the best sources of plant ... In the soil, the amino acids are converted to nitrate (NO− 3), making the nitrogen available to other plants, thereby serving ...
*  The God Species
Lynas focuses on the nitrogen cycle. The land use boundary. The freshwater boundary. The toxics boundary, referring to chemical ... The biogeochemical boundary in the original framework has two parts: a) anthropogenic nitrogen removed from the atmosphere and ...
*  Extraterrestrial atmosphere
Hansen, C; Paige, D (Apr 1996). "Seasonal Nitrogen Cycles on Pluto". Icarus. 120: 247-265. Bibcode:1996Icar..120..247H. doi: ... Hansen, Candice J.; Paige, David A. (April 1996). "Seasonal Nitrogen Cycles on Pluto". Icarus. 120 (2): 247-265. Bibcode: ... The surface temperature is at least 35.6 K, with the nitrogen atmosphere in equilibrium with nitrogen ice on Triton's surface. ... It contains minor amounts of nitrogen and other trace elements, including compounds based on hydrogen, nitrogen, sulfur, carbon ...
*  Chemical cycling
... and carbon dioxide cycle), terrestrial biological carbon cycle, oceanic carbon cycle and geological carbon cycle Nitrogen cycle ... CNO cycle). In addition to this cycle, stars also have a helium cycle. Various cycles involving gas and dust have been found to ... Enceladus has an active hydrological, silicate and possibly a nitrogen cycle. Uranus has an active methane cycle. Methane is ... Notable active chemical cycles on Earth include: Carbon cycle - consisting of an atmospheric carbon cycle ( ...
*  Reuse of excreta
Closing the Nitrogen Cycle" (PDF). Stockholm Water Company. Pradhan, Surendra K; Nerg, Anne-Marja; Sjöblom, Annalena; ... This also applies to excreta-based fertilizer since it also contains nitrogen. Excessive nitrogen which is not taken up by ... In particular nitrogen content in urine is related to quantity of protein in the diet. A high protein diet results in high urea ... Urine can contain up to 90 percent of the nitrogen, up to 50 percent of the phosphorus, and up to 70 percent of the potassium ...
*  P. Ananda Kumar
Photorespiratory nitrogen cycle-A critical evaluation. Physiologia Plantarum 66: 169-176 Kumar et al., 1988, Glycine supports ... His research contributions lead to the finding that the photorespiratory nitrogen cycle is an open process. He discovered that ... New Delhi in 1979 and started working in the area of Plant Nitrogen Metabolism. ...
*  Koi pond
This cycle is called the nitrogen cycle. A biofilter can be constructed in many different ways. It is important for the koi ...
*  Urine
... has a role in the earth's nitrogen cycle. In balanced ecosystems urine fertilizes the soil and thus helps plants to grow ... Closing the Nitrogen Cycle" (PDF). Stockholm Water Company. Håkan Jönsson (2001-10-01). "Urine Separation - Swedish Experiences ... Urine, a nitrogen source, was used to moisten straw or other organic material, which was kept moist and allowed to rot for ... On an elemental level, human urine contains 6.87 g/L carbon, 8.12 g/L nitrogen, 8.25 g/L oxygen, and 1.51 g/L hydrogen. The ...
*  Urine diversion
Johansson M, Jönsson H, Höglund C, Richert Stintzing A, Rodhe L (2001). "Urine Separation - Closing the Nitrogen Cycle" (PDF). ...
*  Caminibacter
by James W.B. (2011). Nitrogen cycling in bacteria : molecular analysis. Norfolk: Caister Academic Press. ISBN 1-904455-86-7. ...
*  Trichodesmium thiebautii
... in oceanic nitrogen cycling is significant because nitrogen is an essential element for life. Nitrogen is present in microbial ... are responsible for a significant portion, perhaps as much as 25%, of the nitrogen cycling in oceanic ecosystems. The role of T ... The Nitrogen Cycle at Regional to Global Scales. Springer Netherlands. pp. 47-98. JSTOR 1469685. Capone, Douglas G.; Carpenter ... In aquatic habitats, nitrogen is often a limiting nutrient in regards to productivity and fixing it from the atmosphere is ...
*  Lar1
"Nitrate reduction and the nitrogen cycle in archaea". Microbiology. 150 (Pt 11): 3527-46. doi:10.1099/mic.0.27303-0. PMID ... nitrogen fixation. Since nitrogen is required for growth by all biological systems, but is generally biologically inaccessible ... Henckel, P. A.; T. T. Plotnikova (1973). "[Nitrogen-fixing bacteria in lichens]". Izvestiya Akademii Nauk SSSR. Seriya ... in extremely nutrient-poor environments and may rely on nitrogen-fixing bacteria to provide them with enough molecular nitrogen ...
*  Beaver dam
Some scientists believe that the nitrogen cascade, the production of far more fixed nitrogen than the natural cycles can turn ... Beavers are then likely to recolonize the area, and the cycle begins again. Each time the stream life cycle repeats itself ... the conversion of nitrogen compounds back into nitrogen). Bacteria in the dirt and the plant debris, which collects at the dams ... These bacterial populations face serious shortages of nitrogen and phosphorus compounds, and will absorb these nutrients as ...
*  Archaea
... are a major part of Earth's life and may play roles in both the carbon cycle and the nitrogen cycle. No clear examples ... Archaea carry out many steps in the nitrogen cycle. This includes both reactions that remove nitrogen from ecosystems (such as ... Francis CA; Beman JM; Kuypers MM (May 2007). "New processes and players in the nitrogen cycle: the microbial ecology of ... Cabello P; Roldán MD; Moreno-Vivián C (November 2004). "Nitrate reduction and the nitrogen cycle in archaea". Microbiology. 150 ...