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名人故事:一种霉素两次发现三人获奖_1500字
作者: 发布日期:2012-09-13 点击数:214

  1941年2月12日,伦敦一家大医院收治了一个43岁的警察——一个已处于休克状态的垂危病人。专家们经过会诊后,认为他的败血症已经非常严重,不可能挽救了。于是,正在研究青霉素的佛罗理医生,决定“死马当作活马医”,把这个警察作为用青霉素治病的临床试验的第一个病人。

  一针青霉素打进去了,往后是每隔3个小时再打一针。奇迹出现了:24小时后,病情有了明显好转;第3天,警察的意识已经清楚;第5天,病人想吃东西了。可是到了第6天,佛罗理培养的青霉素已经用完,整个伦敦也再找不到这种有效的药物了。佛罗理眼睁睁地看着警察的病情再度恶化,最后死去了。

  这次治疗是成功还是失败了?可能有人认为是失败了,因为病人最终还是死了。可佛罗理医生却认为是成功的,他从警察病情的变化中看到了青霉素的威力。他敏感地意识到,弗莱明医生发现的这种物质将成为本世纪最伟大的发现之一,将有可能去挽救千百万人的生命。

  弗莱明发现青霉素,是一个很有意思的故事。

  1928年,弗莱明在伦敦梅利医院当医生。这个47岁的中年人正在起劲地研究对付葡萄球菌的办法。人们受伤后伤口化脓,原因之一便是葡萄球菌在捣蛋。弗莱明在一只只培养皿里培养出葡萄球菌,然后再试验用各种药剂去消灭它们。这个工作已花费了他几年的时间,至今仍一无所获——这个葡萄球菌实在是个难对付的家伙!

  9月的一天早晨,弗莱明发现其中一只培养皿里竟长出了一团青绿色的霉毛。显然,这是某种天然霉菌落进去造成的。这使他感到懊丧,因为这只培养皿里的培养物没有用了。弗莱明正想把这发了霉的培养物倒掉,突然产生了一个念头:把它拿到显微镜下去看看。

  “啊!”弗莱明一看显微镜,情绪马上激动起来了:在霉斑附近,葡萄球菌死了!这是不是他梦寐以求,已追寻了好几年的葡萄球菌的克星呢?弗莱明立即动手大量培养这种青绿色的霉菌,将培养液过滤,滴到葡萄球菌中去。结果,葡萄球菌在几小时之内全部死亡。将滤液冲稀800倍,再滴到葡萄球菌中去,它居然仍能杀死葡萄球菌!

  弗莱明把这种培养液叫做青霉素。接下来,他又做了病理试验,把青霉素注入小白鼠体内,结果什么影响也没有,证明青霉素对动物无毒害。他又在家兔的眼睛里滴入这种液体,也没有发现异常现象。

  1929年6月,弗莱明把自己的发现写成论文,发表在英国的《实验病理学》季刊上。可是,你可能想象不到,这篇论文竟未能引起医学界广泛的重视。有人认为青霉素的性质很不稳定,不值得深入研究。弗莱明本人也由于种种原因,未能再继续研究下去。刚刚出世的青霉素被打入了冷宫。

  1938年,英国医生佛罗理和钱恩在研究溶菌酶的时候,从文献中发现了弗莱明的文章。这引起了他们的高度注意,立即着手继续弗莱明当年的研究。这在科学史上被认为是青霉素的第二次发现。

  佛罗理和钱恩将弗莱明发现的液状霉素,经过过滤、浓缩、提纯、干燥,终于得到了一种黄色粉末。经过许多次实验,他们证实了青霉素的药效极高,把它稀释50万倍仍能有效地杀灭细菌,这是一种极有临床价值的新型抗菌药。他们并在1941年进行了第一次青霉素治病的临床试验,这次试验我们在前面刚提到过。

  但是,当时提取青霉素的方法很不理想。从100公斤的青霉菌培养液中所提取到的青霉素,只能刚刚够一个病人的一天治疗用量。靠这种方法来生产,需要大量的财力和物力。那时正值第二次世界大战,英国没有力量进行这种昂贵的生产研究,而战争又急需大量的高效抗菌药。

  在英国的请求下,美国承担了这一任务。结果发现,生长在烂甜瓜表面的菌种最好;用玉米粉调配的培养液最利于繁殖;在24℃的温度下最利于大量生产。这3个条件都不难办到,青霉素终于大批量生产起来,成为一种价格便宜的特效药物了。

  1945年,青霉素先后二次发现的有功之臣——弗莱明、佛罗理、钱恩,一同荣获了本年度的诺贝尔生理或医学奖。

  有人在评论青霉素的发现时说:“弗莱明发现青霉素可以说是既偶然又幸运。这个发现是由3个因素偶然地同时出现所造成的。”这里指的因素之一是落到弗莱明的培养皿中的霉菌,恰好是分泌青霉素的;因素之二是培养皿中的细菌,恰好是能被青霉素杀灭的;因素之三是恰好弗莱明本人在做实验,若是旁人,几乎可以肯定会按常规扔掉这只混有“杂菌”的培养皿的。

  这种说法不能说一点道理都没有。然而仔细想想就会知道,这是与弗莱明几年来的苦心寻觅分不开的,与他历来的认真、细致的工作态度分不开的。正如法国着名微生物学家巴斯德所说:“在观察的领域中,机遇只偏爱那种有准备的头脑。”



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  147. /www/wwwroot/caiziyue/vendor/topthink/framework/src/think/facade/Route.php ( 4.70 KB )
  148. /www/wwwroot/caiziyue/vendor/topthink/think-multi-app/src/Url.php ( 7.52 KB )
  149. /www/wwwroot/caiziyue/vendor/topthink/framework/src/think/route/Url.php ( 14.07 KB )
  150. /www/wwwroot/caiziyue/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000402s ] mysql:host=127.0.0.1;port=3306;dbname=www_caiziyue_com;charset=utf8
  2. SHOW FULL COLUMNS FROM `qing_styles` [ RunTime:0.000761s ]
  3. SELECT * FROM `qing_styles` WHERE `etitle` = 'head' LIMIT 1 [ RunTime:0.000704s ]
  4. SHOW FULL COLUMNS FROM `qing_site_styles` [ RunTime:0.001233s ]
  5. SELECT * FROM `qing_site_styles` WHERE `id` = 1 LIMIT 1 [ RunTime:0.000772s ]
  6. SHOW FULL COLUMNS FROM `qing_category` [ RunTime:0.000900s ]
  7. SELECT * FROM `qing_category` WHERE `parent_id` = 0 AND `catetype` = 0 [ RunTime:0.000970s ]
  8. SELECT * FROM `qing_category` WHERE `parent_id` = 76 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000675s ]
  9. SELECT * FROM `qing_category` WHERE `parent_id` = 77 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000814s ]
  10. SELECT * FROM `qing_category` WHERE `parent_id` = 89 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000654s ]
  11. SELECT * FROM `qing_category` WHERE `parent_id` = 95 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000339s ]
  12. SELECT * FROM `qing_category` WHERE `parent_id` = 99 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000333s ]
  13. SHOW FULL COLUMNS FROM `qing_nav` [ RunTime:0.000354s ]
  14. SELECT * FROM `qing_nav` WHERE `status` = 1 [ RunTime:0.000262s ]
  15. SHOW FULL COLUMNS FROM `qing_archives` [ RunTime:0.000542s ]
  16. SELECT * FROM `qing_archives` WHERE `id` = 13813 LIMIT 1 [ RunTime:0.000587s ]
  17. SHOW FULL COLUMNS FROM `qing_user` [ RunTime:0.000416s ]
  18. SELECT * FROM `qing_user` WHERE `iuid` = 87 LIMIT 1 [ RunTime:0.000414s ]
  19. UPDATE `qing_archives` SET `click` = 215 WHERE `id` = 13813 [ RunTime:0.001728s ]
  20. SELECT * FROM `qing_category` WHERE `id` = 103 LIMIT 1 [ RunTime:0.000256s ]
  21. SELECT * FROM `qing_category` WHERE `parent_id` = 95 ORDER BY `listorder` ASC [ RunTime:0.000288s ]
0.093491s