首页
登录
职称英语
Perhaps one of the best-known accidental discovery is Sir Alexander 【M1】____
Perhaps one of the best-known accidental discovery is Sir Alexander 【M1】____
游客
2023-10-13
30
管理
问题
Perhaps one of the best-known accidental discovery is Sir Alexander 【M1】______
Fleming’s discovery of penicillin. In 1922 Fleming accidentally discovered
an antibiotic that killed bacteria but not white blood cells . While suffering 【M2】______
from a cold, Fleming made a culture from some of his own nasal secretions.
As he examined the culture dish, filling with yellow bacteria, a tear fell from his 【M3】______
eye into the dish. The next day when he examined the culture, he found a clear
space which the tear had fallen. His keen observation and inquisitiveness led 【M4】______
him to the correct conclusion: the tear contained a substance that caused rapid
destruction of the bacteria, but was harmless to human tissue. The antibiotic
in the tear he named lysozyme. It turned to be of little practical importance, 【M5】______
because the germs that lysozyme killed were relatively harmless, and this discovery 【M6】______
was an essential prelude to this of penicillin, as we shall see. 【M7】______
In 1928, Fleming was doing a research on influenza. While carrying out some 【M8】______
routine laboratory work that involved microscopic examination of cultures of
bacteria growth in petri dishes(flat glass dishes with covers), Fleming notice in 【M9】______
one dish an unusual clear area. Examination showed that the clear area surrounded
a spot where a bit of mould had fallen onto the dish, which had been left
uncovered. Remembering his experience with lysozyme, Fleming concluded that
the mould was producing something that was dead to the Staphylococcus bacteria 【M10】______
in the culture dish. Fleming isolated the mould and identified it as belonging to
the genus Penicillium, and he named the antibiotic substance it produced penicillin. [br] 【M8】
选项
答案
a
解析
(do research为惯用搭配,意为“做调查;做研究”,中间不加冠词。)
转载请注明原文地址:https://tihaiku.com/zcyy/3094592.html
相关试题推荐
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
Whatisthenewdiscoveryabout?[br][originaltext]Otypebloodcanbetransfu
随机试题
[originaltext]Interviewer:GoodmorningMr.Pitt.Dositdown.Firstofall,Mr
Informationgatheringhashadalonghistoryandtherearemanywaystodoi
可赎回债券票面利率较高,因此其利率风险往往低于普通债券。()
函数的可去间断点的个数为().A.1 B.2 C.3 D.无穷多个
一位教师说,“我因为热爱自己的教师职业,把自己的收入也拿来助学。没钱时,我就出力
石棉水泥瓦的缺点是()。A.质重 B.易燃 C.易腐蚀 D.有毒
我国的人民民主专政是马列主义关于无产阶级专政的理论同我国革命具体实践相结合的产物
正式沟通网络形式不包括()。 (A)全通道式(B)圆周式 (C)轮式(
根据ECC合同,以下有关早期警告的论述,正确的是( )。 A.早期警告会应由
弥漫性细支气管肺泡癌的典型痰液为() A.大量白色泡沫状痰 B.大量脓性痰
最新回复
(
0
)