| 词汇 | example_english_fixed-nitrogen |
| 释义 | fixed nitrogencollocation in Englishmeanings of fixedand nitrogenThese words are often used together. Click on the links below to explore the meanings. Or, see other collocations with nitrogen. fixed adjective uk /fɪkst/ us /fɪkst/ arranged or decided already and not able to ... See more at fixed nitrogen noun[U] uk /ˈnaɪ.trə.dʒən/ us /ˈnaɪ.trə.dʒən/ a chemical element that is a gas with no colour or taste, forms most of the earth's atmosphere, and is a part of all ... See more at nitrogen Examples of fixed nitrogenThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. However, a greater need for fixednitrogen would have imposed constraints on the rate of cyanobacterial proliferation - constraints that other prokaryotes would not have experienced. While this arrangement could provide cyanobacteria with a more reliable source of fixednitrogen, it would not be cheap. So, fixednitrogen, one of the essential requirements for life as we know it, would not be present. But even with an ability to fix nitrogen, cyanobacteria could still have been limited by a scarcity in abiotic sources of fixednitrogen. However, the unique composition of the photosynthetic apparatus in cyanobacteria would appear to create a substantially greater need for fixednitrogen in several ways. However, studies have shown that inorganic nitrogen fertilizers cannot substitute for biologically fixednitrogen added directly to the soil via legumes. While the relevance of lightning as a source of fixednitrogen has been largely studied, the contribution of coronae discharges still remains unelucidated. In comparison to biologically fixednitrogen, plants tend to use such fertilizer nitrogen inefficiently, leaving excess nitrate ions to be leached into the watershed as nutrient pollution29,47. Evidence is presented for why cyanobacteria probably have a greater need for fixednitrogen than other prokaryotes, underscoring the importance of their ability to fix nitrogen. Sulfate reducing bacteria probably use these substrates directly and may also use this energy source to fix nitrogen themselves - aiding the mat's overall fixednitrogen yield from this fermentation. However, fixednitrogen may circulate many times between organisms and the soil before denitrification returns it to the atmosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Fixednitrogen sources are required for most organisms to synthesize proteins, nucleic acids and other cellular components. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In addition to land runoff, atmospheric anthropogenic fixednitrogen can enter the open ocean. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Heterocyst formation is inhibited in the presence of a fixednitrogen source, such as ammonium or nitrate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Dissimilatory denitrification is the main route by which biologically fixednitrogen is returned to the atmosphere as molecular nitrogen gas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Heterocysts may also form under the appropriate environmental conditions (anoxic) when fixednitrogen is scarce. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The abundance or scarcity of this fixednitrogen (also known as reactive nitrogen) frequently limits plant growth in both managed and wild environments. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The relationship is symbiotic because the plant supplies the energy by photosynthesis and benefits by obtaining the fixednitrogen. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Soft-rot fungi need fixednitrogen in order to synthesize enzymes, which they obtain either from the wood or from the environment. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Want to learn more? Go to the definition of fixed Go to the definition of nitrogen See other collocations with nitrogen |
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