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Co-metabolism
Cometabolism is defined as the simultaneous Chemical decomposition, degradation of two Chemical compound, compounds, in which the degradation of the second compound (the secondary Substrate (chemistry), substrate) depends on the presence of the first compound (the primary Substrate (chemistry), substrate). This is in contrast to simultaneous catabolism, where each substrate is Catabolism, catabolized concomitantly by different enzymes. Cometabolism occurs when an enzyme produced by an organism to catalyze the degradation of its growth-substrate to derive energy and carbon from it is also capable of degrading additional compounds. The fortuitous degradation of these additional compounds does not support the growth of the bacteria, and some of these compounds can even be toxic in certain concentrations to the bacteria. The first report of this phenomenon was the degradation of ethane by the species ''Pseudomonas methanica.'' These bacteria degrade their growth-substrate methane with th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrachloroethylene
Tetrachloroethylene, also known as perchloroethylene or under the systematic name tetrachloroethene, and abbreviations such as perc (or PERC), and PCE, is a chlorocarbon with the formula . It is a non-flammable, stable, colorless and heavy liquid widely used for dry cleaning of fabrics and occasionally as a highly effective automotive brake cleaner. It has a mildly sweet, sharp odor, detectable by most people at a concentration of 50 ppm. Tetrachloroethylene is regarded as a toxic substance, a human health hazard, and an environmental hazard. In 2020, the United States Environmental Protection Agency stated that "tetrachloroethylene exposure may harm the nervous system, liver, kidneys, and reproductive system, and may be harmful to unborn children", and reported that numerous toxicology agencies regard it as a carcinogen. History and production French chemist Henri Victor Regnault first synthesized tetrachloroethylene in 1839 by thermal decomposition of hexachloroethane f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |