这些无毒基因编码含偶数个半胱氨酸的小分子量蛋白，在叶霉菌毒性菌株中的存在与否及存在方式各不相同。
All the Avr genes encode small molecular weight proteins with even Numbers of cysteines, and their existence and variance are different in the virulent strains.
半数受害者都已住院，如此高的住院率表明这可能是一种毒性特别强的大肠杆菌菌株。
Half of the victims have been hospitalised, a high rate that may indicate an especially virulent strain of E. coli.
按顺序排好新菌株的基因，研究人员在实验室中重新构建了它，并把它与猪相接触。证明了该菌株会蔓延的，但只有轻微的毒性。
Having sequenced the new strain's genes, the researchers recreated it in a laboratory and exposed it to pigs. The strain proved contagious but only mildly virulent.
产志贺毒素大肠杆菌(STEC)或肠出血性大肠杆菌(EHEC)是一种毒性严重的大肠杆菌菌株，常见于动物、主要是反刍动物的肠道内。
Shigatoxin-producing E. coli (STEC) or enterohaemorrhagic E. coli (EHEC) is a severe strain of E. coli bacterium that is commonly found in the gut of animals, mainly ruminants.
证明了该菌株会蔓延的，但只有轻微的毒性。
另外一种方法是由毒性减弱的病原微生物制成，当作为疫苗注射时，这种微生物会引起温和的或不表现症状，但是可以保护接受者免受更猛烈的野生菌株的侵害。
In another they were made from weakened strains of pathogenic organisms that caused mild or no symptoms when injected as a vaccine yet protected recipients from more severe wild strains.
幸运的是，这种菌株的毒性远远小于人们原先所担心的，但也造成了约19,000人死亡。
Fortunately, the strain was far less virulent than originally feared, killing about 19,000 people.
该乳酸菌菌株对50只昆明小白鼠的急性毒性试验表明，该乳酸菌菌株对动物机体无急性毒性作用。
It suggested that the isolated Lactobacillus strains were no acute toxicity to the animal body from the acute toxicity test of the isolated Lactobacillus strains to 50 small Kunming white mice.
结果表明：不同碳源对菌株产毒性影响显著。
The results showed that different carbon sources could affect the isolate toxigenicity significantly.
在其中一株引致猩红热的甲型链球菌菌株中发现多一条基因，增强细菌的传播能力，但毒性未见提高。
A new gene fragment has been found in one of the isolates that gives the bacteria an increased ability to spread among humans.
采用中国鉴别寄主对突变体的毒性研究表明，各突变菌株的毒性均较原始菌系发生了明显改变。
Infection assay of mutants on Chinese differential host shows that virulence of all the mutants changes significantly in contrast with wild-type isolates.
本课题从发病稚盘鲍动物中分离致病细菌，通过回归感染确定毒性病原菌株；
The pathogenic bacterium was isolated from the diseased juvenile Haliotis discus discus, and confirmed to be toxic pathogenic strain by recursive infection experiments;
结果表明：（1）河豚鱼的卵巢、肝脏、肠道中存在可产生TTX的细菌与放线菌，河豚鱼不同组织毒性的差异与其中产TTX菌株的产毒能力有关；
Our results demonstrated that (1) the distribution of TTX-producing strains and the bacterial production of TTX is close related with the toxicity of each tissue in puffer fish;
HPLC检测结果显示，ZY-23菌株的发酵产物中提取得到的毒性成份保留时间与标准品基本一致。
The result of HPLC showed that the retion time of the production of strain ZY-23 is similar with standard substance.
HPLC检测结果显示，ZY-23菌株的发酵产物中提取得到的毒性成份保留时间与标准品基本一致。
The result of HPLC showed that the retion time of the production of strain ZY-23 is similar with standard substance.
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