翻訳と辞書 Words near each other ・ – Becchin’amor! – Che vuo’, falso tradito? ・ –30– ・ –30– (The Wire) ・ —We Also Walk Dogs ・ ‘Abd ar-Razzaq as-San‘ani ・ ‘Abdu’l-Hamíd Ishráq-Khávari ・ Α-Santalol ・ Α-Vetivone ・ Α5IA ・ Αr14 RNA ・ Αr15 RNA ・ Αr35 RNA ・ Αr45 RNA ・ Αr7 RNA ・ Αr9 RNA ・ Β-Lactam ・ Β-lactam antibiotic ・ Β-Lactamase inhibitor ・ Β-Methylphenethylamine ・ Β-Naphthol methyl ether ・ Β-Santalol ・ Βk-2C-B ・ Γ-convergence ・ Δ-hyperbolic space ・ Δ-opioid receptor ・ Δ13C ・ Δ15N ・ Δ18O ・ ΔF508 ・ ΔP Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Β-Lactam ： ウィキペディア英語版 Β-Lactam A β-lactam (beta-lactam) ring is a four-membered lactam. (A lactam is a cyclic amide). It is named as such because the nitrogen atom is attached to the β-carbon relative to the carbonyl. The simplest β-lactam possible is 2-azetidinone. ==Clinical significance== The β-lactam ring is part of the core structure of several antibiotic families, the principal ones being the penicillins, cephalosporins, carbapenems, and monobactams, which are, therefore, also called β-lactam antibiotics. Nearly all of these antibiotics work by inhibiting bacterial cell wall biosynthesis. This has a lethal effect on bacteria. Bacteria do, however, contain within their populations, in smaller quantities, bacteria that are resistant against β-lactam antibiotics. They do this by expressing one of many β-lactamase genes. More than 1,000 different β-lactamase enzymes have been documented in various species of bacteria. These enzymes vary widely in their chemical structure and catalytic efficiencies.〔 When bacterial populations have these resistant subgroups, treatment with β-lactam can result in the resistant strain becoming more prevalent and therefore more virulent. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Β-Lactam」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.