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
2024-08-07
24
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] 【M2】
选项
答案
√
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3709204.html
相关试题推荐
Perhapsoneofthemosttragicmastersofart,VanGogh,yearned______recognitio
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
TennisstarChrisEvert,whoretiredfromthegameaftereighteenyears,perhaps
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Warning;Poisonous!Ifaccidentallyswallowed,______vomitingatonceandseekme
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
随机试题
Mr.Brown,whowasnoteasilysurprised,wasquite______whenheheardtheresult
[originaltext]TheUNdiplomatinchargeofoverseeingarmsinspectionteams
WatchingTweedandJefferybattle,Alicewonderedwhathadcausedthispointless
关于商标权的叙述错误的是( )。A.商标需要注册,未注册的商标即使能带来经济效
试述肝脓肿的诊断?
某公司的销售净利率为6%,总资产周转率为3,资产负债率为80%,则该公司的净资产
请认真阅读下列材料,并按下面要求作答。 请根据上述材料完成下
不符合十二指肠溃疡疼痛特点的叙述是 A.节律性上腹痛B.周期性疼痛C.疼痛
作为ATP贮存库的磷酸肌酸主要存在于 A.肝B.褐色脂肪组织C.肌肉组
中医学认为,构成人体的中心是A.五脏 B.六腑 C.奇恒之腑 D.形体官窍
最新回复
(
0
)