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  2. Predicted no-effect concentration - Wikipedia

    en.wikipedia.org/wiki/Predicted_no-effect...

    The use of assessment factors allows for laboratory, single-species and short term toxicity data to be extrapolated to conservatively predict ecosystem effects and accounts for the uncertainty in the extrapolation. The value of the assessment factor is dependent on the uncertainty of the available data and ranges from 1-1000. [1] [6] [7]

  3. 1,2-Dichlorotetrafluoroethane - Wikipedia

    en.wikipedia.org/wiki/1,2-Dichlorotetrafluoroethane

    1,2-Dichlorotetrafluoroethane, or R-114, also known as cryofluorane , is a chlorofluorocarbon (CFC) with the molecular formula ClF 2 CCF 2 Cl. Its primary use has been as a refrigerant. It is a non-flammable gas with a sweetish, chloroform-like odor with the critical point occurring at 145.6 °C and 3.26 MPa. When pressurized or cooled, it is a ...

  4. Biological carbon fixation - Wikipedia

    en.wikipedia.org/wiki/Biological_carbon_fixation

    Cyanobacteria such as these carry out photosynthesis.Their emergence foreshadowed the evolution of many photosynthetic plants and oxygenated Earth's atmosphere.. Biological carbon fixation, or сarbon assimilation, is the process by which living organisms convert inorganic carbon (particularly carbon dioxide, CO 2) to organic compounds.

  5. Terpene - Wikipedia

    en.wikipedia.org/wiki/Terpene

    The term terpene was coined in 1866 by the German chemist August Kekulé to denote all hydrocarbons having the empirical formula C 10 H 16, of which camphene was one. Previously, many hydrocarbons having the empirical formula C 10 H 16 had been called "camphene", but many other hydrocarbons of the same composition had different names.

  6. Benzoylecgonine - Wikipedia

    en.wikipedia.org/wiki/Benzoylecgonine

    Preliminary studies on ecological systems show that benzoylecgonine has potential toxicity issues. [7] Research is being conducted on degradation options such as advanced oxidation and photocatalysis [8] for this metabolite in an effort to reduce concentrations in waste and surface waters. At environmentally relevant concentrations ...

  7. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    Freshwater environmental quality parameters are those chemical, physical and biological parameters that can be used to characterise a freshwater body. Because almost all water bodies are dynamic in their composition, the relevant quality parameters are typically expressed as a range of expected concentrations.

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