阴性

Cytology was negative in 19 cases or suspected in 17 cases of mesothelioma CYFRA21-1 positive.

19例细胞学为阴性或可疑的间皮瘤中有17例CYFRA21-1阳性。

If negative, cytology should be repeated again in four to six months.

如果细胞学阴性，细胞学检查必须4－6个月重复一次。

The results prove that CNHK500 has highly proliferation selectivity and potent cytolysis effect on breast cancer in vitro.

在感染CNHK500的端粒酶阴性的正常成纤维细胞株中未检测到E1A基因表达，在端粒酶阳性的感染CNHK500的乳腺癌细胞株中能够检测到E1A基因的表达；CNHK500可以选择性地在缺氧条件下表达E1B。

Based on these results, FCM analysis combined with convetional cytopathology yielded 100% specificity, 94% sensitivity and 100% predictive value of postitive result. There were no false-positive results but 2 false-negative results.

如果FCM DNA定量法及临床细胞诊断法同时测定可使胸水诊断之特殊性为100%，敏感性为94%及100%预估阳性结果，因为无伪阳性结果，但有两例伪阴性出现。

The results show that the dispersity of emulsion is good and the average diameter of particles is about 15 nm. Its bactericidal properties to some bacteria and epiphytes are strong under daylight lamp irradiation. The killing rate to Gram negative bacterium (Staphylococcus aureus and Bacillus subtilis) is 100%, in addition, killing activity of it to Gram positive bacterium is very high. It has a clear antibacterial circle of about 20 mm in diameter toward epiphytes such as Aspergillus niger, Aspergillus flavus and Candida albicans etc.

结果表明，混晶乳液分散性好，粒径约15nm；在普通日光灯照射下，乳液对一些细菌和真菌有很好的抗菌性能：对革兰氏阳性菌（金黄葡萄球菌和枯草芽孢杆菌）的杀灭率达到100%，对革兰氏阴性菌也有很好的杀灭性能，对黑曲霉、黄曲霉和白色念珠菌等真菌产生清晰的抑菌圈，抑菌直径约20mm。

So the deal is they can't definitively say that it's primary liver cancer.

可是我的一项血液肿瘤试验是阴性，肿瘤医生讲很奇怪。

Objective To explore the relationship of temperatures for denaturalization and annealing to the false negative PCR result.

目的 探讨聚合酶链式反应变性及退火温度与产物假阴性之间的关系。

False negative PCR result appeared when the temperature for denaturalization was too low while that for annealing was too high.

过低的变性温度和过高的退火温度会导致PCR产物出现假阴性。

The lower denaturation temperature can decrease amplification efficiency or even cause the false-negative results of PCR.

较低的变性温度可导致扩增效率降低甚至假阴性的结果。

DET was positive for regional wall motion abnormalities in 291 (25%) and negative in 854 (74%) patients.

室壁运动不正常区域的DET阳性的有291例（ 25 ％）和阴性的有854例（ 74 ％）。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐