致病性

Results After six passages in BHK-21 cells, cytopathic effect was observed by microscopy. The rescued virus was rejuvenated once in unweaned mice, and then came back to cell passage. We found that the poly tract of rescued virus was shortened when the virus was passaged twice in BHK-21 cells. Although the data of LD50 in mice and TCID50 in BHK-21 cells showed that the virulence and infectivity of genetic engineering viruses were lower than its parental virus, no significant difference was observed between the genetic engineering viruses with the different length poly tract.

我们发现，基因工程毒在BHK-21上连续传代至第6代时，可见明显的致细胞病变效应(cytopathic effect，CPE)；在经过一代乳鼠接种之后再重新适应到BHK-21细胞的过程中，poly区段出现了缩短现象；乳鼠致病性试验和BHK-21细胞TCID50测定结果表明，尽管基因工程毒与母本毒相比毒力偏低，但含有不同长度poly的基因工程毒之间并无显著差异。

The maximum induction occurred at 12 h, at which transcripts were 0.34 fold of that in urediniospore. The minimum accumulation occurred at 96 h, whose transcript was only 0.02 fold of that in urediniospore.

PsCdc2可能通过调控条锈菌的细胞周期循环参与了侵染前期初生菌丝生长和吸器母细胞的形成，与条锈菌的致病性相关。

The test adopted by the different varieties of resistance and cross-species around the vaccination, the identification of pathogenic changes in the analysis of Ustilago crameri koern division race.

本项试验通过用不同抗性品种与各地菌种交叉接种，鉴定其致病性变化，分析出黑穗病病菌小种分化。在谷子黑穗病病菌群体中确实存在着不同的小种分化。

Results No apparent cytopathic effects could be observed during the first 24 hours of infection with L-form and elementary bodies, but the cytoplasm of some MA104 cells became vacuolated when the L-forms entering into the cells as shown by immunohistochemical staining and PCR.

结果 发现金葡菌L型及滤过的原生小体对细胞致病性降低，细胞不出现明显病变，部分细胞出现空泡样变，免疫组化及金葡菌PCR显示感染细胞内出现金葡菌抗原及DNA。

One of them even chugged a glassful of the bugs to prove the point.

其中一位甚至喝了一杯幽门螺旋杆菌来亲自证实它们的致病性。

In greenhouse the pathotype of 41 strains of Vertwilltum dahliae of cotton were studied by maculating the seedlings of 4 different cotton cultivars, EjingNo. 1~ Zhong-12 WcnS and TangmianNo.2. 41 stains were clustered into 2 groups: defoliating types and nondefoliating types.

采用8个棉花黄萎病菌代表菌系和33个北方菌系，在温室条件下，选用鄂荆1号、中-12、文5和唐棉2号4个不同的棉花品种进行致病性测定，其结果根据病株落叶与否可将供试菌系分为落叶型与非落叶型两类。

As an important colonization factor, TcpA fimbriae are closely related to the pathogenicity of Vibrio cholerae and the epidemic of cholera.

TcpA菌毛作为重要的粘附定居因子与霍乱弧菌的致病性和霍乱流行密切相关。

Clinical waste suspected of harbouring high risk pathogens must be packed in special containers.

对怀疑有高致病性病原体的临床垃圾，必须放入专用容器中。

Amid a growing E. coli scare, Topps Meat Company is expanding its recall of frozen hamburger patties.

在对致病性大肠杆菌不断增长的恐慌中，Topps肉类公司扩大了召回冷冻汉堡小馅饼的数量。

All C.neoformans contain serine protease; Serine proteinase perturbs the integrity of BMEC of the blood-brain barrier, improves open the level of BBB; Secreted serine protease from pathogenic fungi were virulence.

发现新生隐球菌分泌具有活性的胞外蛋白水解酶并含有丝氨酸蛋白酶成分；新生隐球菌自身分泌的丝氨酸蛋白酶可以干扰构成血脑屏障主要成分内皮细胞的完整性使得血脑屏障开放程度提高；致病性真菌分泌的丝氨酸蛋白酶可能是一种毒性因子。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。