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  2. Dissimilatory nitrate reduction to ammonium - Wikipedia

    en.wikipedia.org/wiki/Dissimilatory_nitrate...

    Dissimilatory nitrate reduction to ammonium is a two step process, reducing NO 3 − to NO 2 − then NO 2 − to NH 4 +, though the reaction may begin with NO 2 − directly. [1] Each step is mediated by a different enzyme, the first step of dissimilatory nitrate reduction to ammonium is usually mediated by a periplasmic nitrate reductase.

  3. Human impact on the nitrogen cycle - Wikipedia

    en.wikipedia.org/wiki/Human_impact_on_the...

    Human activities account for over one-third of N 2 O emissions, most of which are due to the agricultural sector. [2] This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems .

  4. Mechanism (sociology) - Wikipedia

    en.wikipedia.org/wiki/Mechanism_(sociology)

    The term social mechanisms and mechanism-based explanations of social phenomena originate from the philosophy of science.. The core thinking behind the mechanism approach has been expressed as follows by Elster (1989: 3-4): “To explain an event is to give an account of why it happened.

  5. Nitrogen cycle - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_cycle

    The ANaerobic AMMonia OXidation process is also known as the ANAMMOX process, an abbreviation coined by joining the first syllables of each of these three words. This biological process is a redox comproportionation reaction, in which ammonia (the reducing agent giving electrons) and nitrite (the oxidizing agent accepting electrons) transfer ...

  6. Ammonium - Wikipedia

    en.wikipedia.org/wiki/Ammonium

    An example of a reaction forming an ammonium ion is that between dimethylamine, (CH 3) 2 NH, and an acid to give the dimethylammonium cation, [(CH 3) 2 NH 2] +: Quaternary ammonium cations have four organic groups attached to the nitrogen atom, they lack a hydrogen atom bonded to the nitrogen atom.

  7. Nitrogen fixation - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_fixation

    This process uses natural gas as a hydrogen source and air as a nitrogen source. The ammonia product has resulted in an intensification of nitrogen fertilizer globally [ 71 ] and is credited with supporting the expansion of the human population from around 2 billion in the early 20th century to roughly 8 billion people now.

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  9. Ethnomethodology - Wikipedia

    en.wikipedia.org/wiki/Ethnomethodology

    Using an appropriate Southern California example: ethno refers to a particular socio-cultural group (for example, a particular, local community of surfers); method refers to the methods and practices this particular group employs in its everyday activities (for example, related to surfing); and ology refers to the systematic description of ...