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神奇的药物---青霉素
双击自动滚屏 发布者:admin 发布时间:2009/3/13 14:04:37 阅读:307次 【字体:

亚历山大·弗莱明由于一次幸运的过失而发现了青霉素。有一次他外出度假时,把实验室里在培养皿中正生长着细菌这件事给忘了。3周后当他回实验室时,注意到在一个培养皿中长了一个霉菌斑。并且霉菌斑周围的细菌都死了。左图:弗莱明第一次看到的生长有青霉菌的培养皿。 

  霉菌渗出了什么强有力的物质?弗莱明称为青霉素,并发现了它可以杀死许多致命性细菌。然而,因为青霉素在试管内和血清混合后很快失活,弗莱明认为它不会在人和动物身上发生作用。

  10多年后,弗洛里和钱恩在1940年用青霉素重新做了实验。他们给8只小鼠注射了致死剂量的链球菌,然后给其中的4只用青霉素治疗。几个小时内,只有那4只用青霉素治疗过的小鼠还健康活着。“这真像一个奇迹!”弗洛里说道。  

  到了1943年,制药公司已经发现了批量生产青霉素的方法。英国和美国当时正在和纳粹德国交战。这种新的药物对控制伤口感染非常有效。到了1944年,药物的供应已经足够治疗第二次世界大战期间所有参战的盟军士兵。

 
 

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