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2. Biochemical oxygen demand - Wikipedia

   en.wikipedia.org/wiki/Biochemical_oxygen_demand

   Biochemical oxygen demand is the amount of oxygen required for microbial metabolism of organic compounds in water. This demand occurs over some variable period of time depending on temperature, nutrient concentrations, and the enzymes available to indigenous microbial populations. The amount of oxygen required to completely oxidize the organic ...

3. Cellular respiration - Wikipedia

   en.wikipedia.org/wiki/Cellular_respiration

   Aerobic respiration. Aerobic respiration requires oxygen (O 2) in order to create ATP.Although carbohydrates, fats and proteins are consumed as reactants, aerobic respiration is the preferred method of pyruvate production in glycolysis, and requires pyruvate to the mitochondria in order to be fully oxidized by the citric acid cycle.

4. Winkler titration - Wikipedia

   en.wikipedia.org/wiki/Winkler_titration

   Instrumental methods for measurement of dissolved oxygen have widely supplanted the routine use of the Winkler test, although the test is still used to check instrument calibration. BOD 5 [ edit ] To determine five-day biochemical oxygen demand (BOD 5 ), several dilutions of a sample are analyzed for dissolved oxygen before and after a five-day ...

5. Biochemistry - Wikipedia

   en.wikipedia.org/wiki/Biochemistry

   Biochemistry or biological chemistry is the study of chemical processes within and relating to living organisms. [1] A sub-discipline of both chemistry and biology, biochemistry may be divided into three fields: structural biology, enzymology, and metabolism. Over the last decades of the 20th century, biochemistry has become successful at ...

6. Chemical oxygen demand - Wikipedia

   en.wikipedia.org/wiki/Chemical_oxygen_demand

   Chemical oxygen demand. In environmental chemistry, the chemical oxygen demand ( COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. It is commonly expressed in mass of oxygen consumed over volume of solution which in SI units is milligrams per litre ( mg / L ).

7. Streeter–Phelps equation - Wikipedia

   en.wikipedia.org/wiki/Streeter–Phelps_equation

   The Streeter–Phelps equation determines the relation between the dissolved oxygen concentration and the biological oxygen demand over time and is a solution to the linear first order differential equation [1] This differential equation states that the total change in oxygen deficit (D) is equal to the difference between the two rates of ...

8. Oxygen evolution - Wikipedia

   en.wikipedia.org/wiki/Oxygen_evolution

   Oxygen evolution. Oxygen evolution is the process of generating molecular oxygen (O 2) by a chemical reaction, usually from water. Oxygen evolution from water is effected by oxygenic photosynthesis, electrolysis of water, and thermal decomposition of various oxides. The biological process supports aerobic life.

9. Respiration (physiology) - Wikipedia

   en.wikipedia.org/wiki/Respiration_(physiology)

   Ventilation refers to the in-and-out movement of air of the lungs and perfusion is the circulation of blood in the pulmonary capillaries. [1] In mammals, physiological respiration involves respiratory cycles of inhaled and exhaled breaths. Inhalation (breathing in) is usually an active movement that brings air into the lungs where the process ...