methyls
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Heme — A heme (American English) or haem (British English) is a prosthetic group that consists of an iron atom contained in the center of a large heterocyclic organic ring called a porphyrin . Not all porphyrins contain iron, but a substantial fraction… … Wikipedia
Gauche effect — Main article: alkane stereochemistry The term gauche refers to conformational isomers (conformers) where two vicinal groups are separated by a 60° torsion angle. IUPAC defines groups as gauche if they have a synclinal alignment of groups attached … Wikipedia
Maitotoxin — Not to be confused with mitotoxin. Maitotoxin Identifiers … Wikipedia
Coproporphyrinogens — are tetrapyrroles with four propionic acid groups and an equal number of substituted methyls. Coproporphyrinogen III is the most common variance. In the metabolism of porphyrin, it is formed from uroporphyrinogen III by the enzyme… … Wikipedia
Organoaluminium — bond. [Atkins inorganic chemistry , organometallic compounds.] History Organoaluminium compounds, little known until the 1950s, have become widely accepted and increasingly important in the field of industry and in the laboratory, particularly… … Wikipedia
Histone — Structure d un nucléosome. On distingue les extrémités N terminales des histones se projetant à l extérieur de la partie globulaire du nucléosome Les histones sont des protéines très riches en acides aminés basiques, que l on trouve dans le noyau … Wikipédia en Français
tocotrienol — A tocol with three double bonds in the side chain, i.e., with three additional double bonds in the phytyl chain. The natural products carry methyls at one or more of positions 5, 7, and 8 of the chromanol and are thus identical, except for the… … Medical dictionary
Johnson–Corey–Chaykovsky reaction — The Johnson–Corey–Chaykovsky reaction (sometimes referred to as the Corey–Chaykovsky reaction or CCR) is a chemical reaction used in organic chemistry for the synthesis of epoxides, aziridines, and cyclopropanes. It was discovered in 1961 by A.… … Wikipedia
Nuclear magnetic resonance decoupling — (NMR decoupling for short) is a special method used in nuclear magnetic resonance (NMR) spectroscopy where a sample to be analyzed is irradiated at a certain frequency or frequency range to eliminate fully or partially the effect of coupling… … Wikipedia
BTX — abbr. for benzene, toluene, and xylene. These aromatic molecules are very important components of gasoline and petrochemicals. Benzene, the simplest aromatic, is carcinogenic and its level in gasoline is severely restricted. Toluene and xylene… … Petroleum refining glossary
