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如何衡量毒性?How is virulence measured?

病原菌的效应分子是导致植物发病的毒性因子。Pathogen effectors are virulence factors causing plant diseases.

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寄生的抗病性的病原菌的毒力在杂交中是势均力敌的。Host resistance and fungal virulence parallel each other in the cross.

痢疾杆菌毒力的表达是温度相关的。The expression of virulence genes of Shigella is temperature-dependent.

不过我们也知道,对于人类,该病毒没有损失其任何致命性。For humans, we also know that this virus has lost none of its virulence.

一旦群体数量达到时,细菌就会打开它们的毒性基因。Once this quorum is reached, the bacteria turn on their virulence genes.

结论河北省鼠疫自然疫源地病原菌毒力属于中等毒力。Conclutions The virulence of Y. pestis from plague nature foci is moderate.

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据迭,目前尚不清楚这是怎样开发新的毒力。According to Diez, it is not clear exactly how this new virulence developed.

此变异是否与病毒的毒力有关尚待进一步研究。It is to be investigated whether this mutation is associated with virulence.

证实JDS-CPV对我国马尾松毛虫有较好的毒力。The results showed that the JDS-CPV has higher virulence to pine caterpillar.

志贺菌侵袭力的高低及毒力强弱决定了其致病性的强弱。The pathogenicity of Shigella is determined by its invasiveness and virulence.

正是由于旅行人数增多和边境开放,病毒才得以在全球恣意扩散。Their virulence has only been intensified by increased travel and open borders.

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使用蝉拟青霉做材料研究它在生物防治上的开发价值,具有深远的意义。It is significant to study the virulence of ogenic fungi in the biocontrol field.

稻白叶枯病菌在人工培养基上毒性降低受多种因素的影响。Several factors affected attenuation of virulence and colony variation on artificial media.

1918年病毒株的特殊毒性,甚至还可能有另类的起源。An alternative origin might even have contributed to the 1918 strain's exceptional virulence.

青枯菌在连续培养14天后接种致病力不减。The bacteria could be consistently cultured for at least 14 days without losing its virulence.

同一酯酶型株系经不同寄主转移后,其毒力也发生了较明显的变化。The virulence of strains in the same esterase type also changed obviously after host transfer.

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低致病力禽流感常引起呼吸道症状,产蛋量下降。Avian influenza with low virulence is characterized by respiratory symptom and low productirty.

毒力试验结果表明该菌有较强毒力。The virulence experiments also indicated that Chromobacterium violaceum had a strong virulence.

根据他们的毒性标记,致病性菌株分为典型及非典型致病性。According to their virulence markers, EPEC strains are subdivided into typical and atypical EPEC.