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实验五 药敏实验

实验五 药敏实验. 【 目的 】 掌握细菌药物敏感性的测定方法 【 材料 】 大肠杆菌菌液、营养琼脂、药敏纸片、平板、三角瓶、镊子、直尺等. 【 方法 】 准备实验:   ( 1 )实验所需物品的高压灭菌   ( 2 )菌液培养: 菌种复活(划线 18 - 24h ) 转接入肉汤 扩大培养( 18 - 24h ) ( 3 )菌落计数并稀释:活体法、比浊法、吸光度法 ( 4 )将灭菌营养琼脂培养基溶化后取 15mL - 20mL 倒入灭菌平皿内铺制空白平板。. 2 、正式实验

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实验五 药敏实验

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  1. 实验五 药敏实验 【目的】掌握细菌药物敏感性的测定方法 【材料】大肠杆菌菌液、营养琼脂、药敏纸片、平板、三角瓶、镊子、直尺等

  2. 【方法】 准备实验:   (1)实验所需物品的高压灭菌   (2)菌液培养: 菌种复活(划线18-24h) 转接入肉汤 扩大培养(18-24h) (3)菌落计数并稀释:活体法、比浊法、吸光度法 (4)将灭菌营养琼脂培养基溶化后取15mL-20mL倒入灭菌平皿内铺制空白平板。

  3. 2、正式实验 (1)将大肠杆菌菌液用无菌棉签均匀涂于1个空白平板表面,注意涂布均匀。 (2)待菌液吸收,将药敏制片均匀贴于菌液平板表面,注意不要使纸片移动! (3)37℃培养18-24小时,测量抑菌圈大小,判定抗菌药物抑菌作用强弱。

  4. 3、结果及判定 (1)结果判定标准:NCCLS-2007

  5. 【分析与讨论】 1、根据实验结果,比较各种药物对于大肠杆菌抑菌作用的强弱。

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