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Catalase is a tetramer of four polypeptide chains, each over 500 amino acids long. [7] It contains four iron-containing heme groups that allow the enzyme to react with hydrogen peroxide. The optimum pH for human catalase is approximately 7, [8] and has a fairly broad maximum: the rate of reaction does not change appreciably between pH 6.8 and 7 ...
Alcaligenes faecalis is a species of Gram-negative, rod-shaped bacteria commonly found in the environment.It was originally named for its first discovery in feces, but was later found to be common in soil, water, and environments in association with humans.
Buffer capacity falls to 33% of the maximum value at pH = pK a ± 1, to 10% at pH = pK a ± 1.5 and to 1% at pH = pK a ± 2. For this reason the most useful range is approximately pK a ± 1. When choosing a buffer for use at a specific pH, it should have a pK a value as close as possible to that pH. [2]
1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per minute under the specified conditions of the assay method. [ 2 ] The specified conditions will usually be the optimum conditions , including but not limited to temperature , pH , and substrate concentration , that yield the ...
RuBisCO is important biologically because it catalyzes the primary chemical reaction by which inorganic carbon enters the biosphere.While many autotrophic bacteria and archaea fix carbon via the reductive acetyl CoA pathway, the 3-hydroxypropionate cycle, or the reverse Krebs cycle, these pathways are relatively small contributors to global carbon fixation compared to that catalyzed by RuBisCO.
It is found in tetrads, irregular clusters, and cubical packets of eight. It is catalase positive, oxidase positive, and exhibits strictly aerobic metabolism. Optimum growth temperature is 25–37 °C (77–99 °F). It is primarily isolated from human skin, and is one of the major causes of pitted keratolysis.
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