beta-substitution

См. также в других словарях:

• beta — I. noun Etymology: Middle English betha, from Latin beta, from Greek bēta, of Semitic origin; akin to Hebrew bēth beth Date: 14th century 1. the 2d letter of the Greek alphabet see alphabet table 2. beta particle 3. a measure of the risk… …   New Collegiate Dictionary

• beta — Second letter of the Greek alphabet, β (see entry at start of letter “B s.” [G.] * * * Biomedical Electronics Technicians Association * * * be·ta bāt ə, chiefly Brit bē tə n 1) the second letter of the Greek alphabet symbol ß or ß 2) BETA… …   Medical dictionary

• Beta-lactamase — Beta lactamases are enzymes (EC number|3.5.2.6) produced by some bacteria and are responsible for their resistance to beta lactam antibiotics like penicillins, cephalosporins, cephamycins, ertapenems and carbapenems. These antibiotics have a… …   Wikipedia

• Beta-thalassemia — Classification and external resources ICD 10 D56.1 ICD 9 282.44 …   Wikipedia

• Beta (letter) — Beta (uppercase Β, lowercase β, internal unicode|ϐ; el. Βήτα [IPA|ˈviˑta] Vita) is the second letter of the Greek alphabet. In the system of Greek numerals it has a value of 2. It was derived from the Phoenician letter Beth . In high quality… …   Wikipedia

• Substitution — (lat.), Stellvertretung, Einsetzung eines Stellvertreters, namentlich seitens eines Prozeßbevollmächtigten, der seine Vollmacht auf einen andern überträgt; Substitutorium, die zur Beurkundung dessen ausgestellte Urkunde. Das Gemeine Recht kannte… …   Meyers Großes Konversations-Lexikon

• Bêta-galactosidase — β galactosidase La β galactosidase de Penicillum sp. Caractéristiques générales Nom approuvé β D galactoside galactohydrolase Autres noms ou symbole lactase ; β lactosidase ; m …   Wikipédia en Français

• Beta-galactosidase — protein Name = caption = β galactosidase from Penicillum sp. width = 300px HGNCid = 4298 Symbol = GLB1 AltSymbols = EntrezGene = 2720 OMIM = 230500 RefSeq = NM 000404 UniProt = P16278 PDB = ECnumber = 3.2.1.23 Chromosome = 3 Arm = Band =… …   Wikipedia

• Beta-silicon effect — The beta silicon effect also called silicon hyperconjugation in organosilicon chemistry is a special type of hyperconjugation and describes the stabilizing effect of a silicon atom placed in a position once removed (β) from a carbocation. A… …   Wikipedia

• Beta-élimination — Élimination (chimie) En chimie organique, une élimination (ou β élimination) est une réaction qui transforme un alcane substitué (halogénoalcanes, alcools ...) en dérivé éthylénique, voire en alcène, si la molécule de départ, outre le groupe… …   Wikipédia en Français

• Hormona luteinizante polipéptido beta — HUGO 6584 Símbolo LHB Símbolos alt. CGB4; LSH B; hLHB …   Wikipedia Español