【正文】
菌、綠膿桿菌、結核桿菌 為殺菌藥 ① 多環(huán)節(jié)阻礙細菌蛋白質合成 ②通過離子吸附作用, 增加膜通透性 Different from bacteriostatic agents,which are mostly effective by inhibition of microbial protein synthesis,the aminoglycosides are bactericidal. 5 ′50s3 0 SAUG3 ′Cg ro w ing poly peptide dire cti on of mR NA tr ans lati onaminoglyc osid e DBAAUGAUG5 ′ 3 ′AUG5 ′3 ′AUG5 ′ 3 ′AUGAUG5 ′ 3 ′′ ′′ ′′ ′′′′′′ ′′ ′′ ′′ ′氨基苷類 氨基苷類 氨基苷類 研討一 慶大霉素和青霉素合用是否合理? 體內(nèi)過程 胃腸吸收極少或不吸收 蛋白結合率低,主要分布細胞外液 堿性環(huán)境中作用增強 主要經(jīng)腎小球原形排泄 (90%) 在內(nèi)耳外淋巴液中濃度高, t1/2長 產(chǎn)生鈍化酶 改變細胞膜通透性 細胞內(nèi)轉運功能異常 作用靶位改變 二、耐藥機制 Microbial resistance most monly results from the acquisition of plasmides or transposonencoding genes for aminoglycosidemetabolixing enzymes or from impaired transport of drug in to the cell. 三、不良反應 1. 過敏反應 2. 第八對腦神經(jīng)損害 3. 腎毒性 4. 神經(jīng)肌肉阻斷作用 Serious toxicity is a major limitation to the usefulness of the same spectrum of toxicity is shared by all members of the notable are nephrotoxicity and ototoxicity,which can involve both the auditory and vestibular functions of the eighth cranial nerve. 慶大霉素和呋噻米合用是否合理? 研討二 特點 ? 氨基糖苷類抗生素可起到殺菌作用,屬靜止期殺菌藥。 重點、難點 ? 重點:氨基糖苷類抗生素的抗菌作用、不良反應;鏈霉素、慶大霉素等的作用特點。 ? Different from bacteriostatic agents, which