阴性的

Patients had been advised to stop any antacid drug treatment at least 4 weeks before endoscope.

Hp阳性的19例患儿均为活动性胃炎，Hp阴性的17例患儿中有1例为活动性胃炎。

Group I at 21 and 25 weeks of age and Group Ⅱ only at 25 weeks of age were vaccinated subcutaneously in the nape of the neck with 0 5 ml of MG oil emulsion bacterin respectively.

本试验将30只MG阴性的20周龄的蛋种鸡随机分为4组，Ⅰ组于21和25周龄、Ⅱ组仅于25周龄时分别颈部皮下接种MG油乳剂灭活苗0.5 ml/只，Ⅲ组于攻毒后1周接种1 ml/只，另设一组对照，不接种疫苗。

Pedunculated,two were in close proximity to vessels. Conclusion Multiphasic CT has moderate sensitivity in the

数肿瘤在增强早期显示明显，肿瘤邻近血管、蒂状突出及非高密度病灶是造成假阴性的潜在因素。

Objective To study the etiology of serologically negative non A～E hepatitis .

目的 对血清学标志阴性的非甲～戊型肝炎进行病原学研究。

ConclusionIt showed that there might exist HIV infection is some of HIV seronegative IVDUS at high risk of HIV infection.

结论抗-HIV阴性的静脉药瘾高危人群，存在潜在HIV感染。

Objective The study was designed to investigate whether there existed provirus HIV DNA in the liver tissues of intravenous drug users with seronegative results of anti-HIV test.

目的 了解血清抗-HIV阴性的静脉药瘾者肝组织是否存在前病毒HIV DNA。

Tuberculin-negative people should be immunised with BCG.

结核菌素阴性的人应免疫卡介苗。

Institute of Infectious Diseases,Zhejiang Medical University,Hangzhou 310003 Objective The study was designed to investigate whether there existed provirus HIV DNA in the liver tissues of intravenous drug users with seronegative results of anti-HIV test.Methods We detected 38 liver tissues of seronegative IVDUS and 10 liver tissues of non-IVDUS.

选择38例抗-HIV阴性的静脉药瘾者肝组织，10例非静脉药瘾者肝组织，用巢式聚合酶链反应，分别在HIV gag、pol、env三大结构区，用六对引物进行HIV DNA扩增。

And tox screen was negative.

毒性测试也是阴性的

There might be cellular immunity deficiency in PPD negtive patients.

PPD反应阴性的哮喘患儿可能存在着细胞免疫功能低下。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。