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Type III (aka hepatic photosensitivity) is the most common type of photosensitivity reaction seen in animals. [2] In this type, the photodynamic substance is phylloerythrin, a derivative of chlorophyll produced in the body. Normally, phylloerythrin is secreted into the intestine by the biliary system and excreted through the feces.
Some photosensitizing agents, such as St. John's Wort, appear to increase the incidence of inflammatory skin conditions in animals and have been observed to slightly reduce the minimum tanning dose in humans. [34] [35] Some examples of photosensitizing medications (both investigatory and approved for human use) are: St. John's Wort [35] 9-me-bc ...
Organic photochemistry encompasses organic reactions that are induced by the action of light. [ 1 ] [ 2 ] The absorption of ultraviolet light by organic molecules often leads to reactions. In the earliest days, sunlight was employed, while in more modern times ultraviolet lamps are employed.
Another method of termination is the reaction between a lipid radical and a lipid peroxide, or the combination of two lipid peroxide molecules, resulting in stable nonreactive molecules. [ 4 ] [ 5 ] Reinforced lipids that become part of the membrane if consumed with heavy isotope diet also inhibit peroxidation.
The reaction center found in Rhodopseudomonas bacteria is currently best understood, since it was the first reaction center of known structure and has fewer polypeptide chains than the examples in green plants. [1] A reaction center is laid out in such a way that it captures the energy of a photon using pigment molecules and turns it into a ...
In animals and in prokaryotes, beta-ketoacyl-ACP synthase is a domain on type I FAS, which is a large enzyme complex that has multiple domains to catalyze multiple different reactions. Analogously, beta-ketoacyl-ACP synthase in plants is found in type II FAS; note that synthases in plants have been documented to have a range of substrate ...
In organic chemistry, the Mallory reaction is a photochemical-cyclization–elimination reaction of diaryl-ethylene structures to form phenanthrenes and other polycyclic form polycyclic aromatic hydrocarbons and heteroaromatics. [1] [2] This name reaction is named for Frank Mallory, who discovered it while a graduate student. [3]
In chemistry, an acetylide is a compound that can be viewed as the result of replacing one or both hydrogen atoms of acetylene (ethyne) HC≡CH by metallic or other cations. Calcium carbide is an important industrial compound, which has long been used to produce acetylene for welding and illumination .