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阴性结果
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  negative results
     For sera with 10 6~10 9copy HBV/ml,the false negative rate of routine PCR was only 5.0%,while for sera with 10 5~10 4copy HBV/ml,the false negative rate reached 36.8%. In 25 cases with sera HBV equal or less than 10 3 copy/ml,routine PCR showed negative results in most cases except 6 cases (24%) with positive or weak positive results.
     常规PCR检测 10 6~10 9copy/ml的血清假阴性率仅 5 .0 %,10 4 ~ 10 5copy/ml时假阴性率达 36 .8%,10 3 copy/ml主要为阴性结果 ,但有 6例为阳性或弱阳性 ( 2 4.0 %)。
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     The study of false positive/negative results and common trouble of Bactec 9120
     Bactec9120全自动血培养仪的假阳/阴性结果及常见故障的研究
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     In NIH 3T 3 cell micronucleus test,MTBE showed negative results.
     在NIH3T3细胞微核试验中,MTBE呈现阴性结果
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     For sera with weak positive results by routine PCR, FQ-PCR can also show false negative results.
     弱阳性标本FQ PCR检测也可能出现假阴性结果
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     Trials of subchronic toxicity(90 days) revealed that oral toxicity was 19.1 mg/kg for female,and 18.3 mg/kg for male,with negative results on Ames test,micro-nucleus test,and chromosome-type aberration test.
     亚慢性经口毒性(90 d)试验雌为19.1mg/kg,雄为18.3mg/kg; Ames、细胞微核和染色体畸变试验均为阴性结果
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  negative result
     ②Immunohistochemical staining showed that after mouse NIH3T3 cell transfection for 4 days positive expressive products appeared in cytoplasm, and control group showed negative result.
     ②免疫组织化学染色显示:小鼠NIH3T3细胞转染4d后胞浆内可观察到阳性表达产物,对照组呈阴性结果
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     Results With and without S9 activation,there was positive result of the TA97,TA98 and TA100 strains and negative result of the TA102 strain in Ames test.
     结果Ames试验中TA97,TA98,TA100菌株无论代谢活化或非代谢活化,皆为阳性结果,而TA102菌株则为阴性结果
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     In Cushing's disease patients (n= 12), it caused a further increase in the already elevated level of ACTH (P<0. 01 )and cortisol (PR0. 01 )No false negative result was appeared.
     在所有12例增生病人中,ACTH与血F均在已增高的基础值上进一步升高(P值均<0.01),未见假阴性结果
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     By measuring 41 HIV-Ab reference sera(including 13 HIV-Ab positive reference sera and 28 HIV-Ab negative reference sera),no false negative result was found(0/l3).
     通过检测4l份HIV抗体参比血清(其中13份为HIV抗体阳性,28份为HIV抗体阴性),未见假阴性结果(0/13)。
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     Results The organic extracts of uncooked fish meat specimens showed positive result for all of the 3 observed groups of fish raised in water of fish ponds with sewage, and negative result for fish raised in clean fishpond water in micronucleus test.
     结果 本次采集的3组污养鱼肉有机提取物均呈致突变阳性结果,而清养鱼有机提取物呈致突变阴性结果
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  negative finding
     The effective rate, the specificity , the accuracy,false-positive rate,false-negative rate,positive finding predictive value and negative finding predictive value of serum CA242 for the diagnosis of colorectal carcinomas were 43.6%, 77.9%, 73.2%,22.1%,43.8%,41% and 86.6%,respectively.
     且血清CA2 42对结直肠癌诊断的有效率、特异性、准确性、假阳性、假阴性、阳性结果预报价值和阴性结果预报价值分别为 43.6 %、77.9%、73.2 %、2 2 1%、43 8%、41 0 %和 86 6 %。
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  “阴性结果”译为未确定词的双语例句
     the negative rate of 6% (4/68) and false negative rate of 4.4% (3/68).
     4例获阴性结果 ,阴性率 6 % (4 / 6 8) ,其中 3例为假阴性 ,假阴性率 4 .4 % (3/ 6 8)。
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     RESULTS: CHL and CHO were 109.38 mg/ml; it was negative in toxicity.
     对CHO和CHL细胞的IC50均为109.38 mg/ml,并且在该剂量之下为阴性结果
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     The Ames test showed no mutation when routine method was used and the mutagenicity with all the nine concentrations of TA98-S_9 from 11.08 to 709.33mg/L and eight concentrations of TA100-S_9 from 22.17 to 709.33mg/L when gaseous exposure was used.
     Ames常规法为阴性结果,而气态法-S_9TA_(98)菌株从11.08-709.33mg/L的全部9个浓度,及TA_(100)菌株从22.17-709.33mg/L的8个浓度出现致突变阳性结果。
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     DS with MW of 10kDa had a negative anaphylactic reaction while that of 15kDa gave a positive one.
     分子量为10kDa的DS过敏反应为阴性结果,15kDa的DS为阳性结果;
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     For all meniscal lesions,the accuracy of ultrasound was 91.2%,sensitivity 82.6%,specificity 95.1%,positive predictive value 88.4%,negative predictive value 92.4%.
     超声诊断半月板损伤的准确率91.2%,敏感性82.6%,特异性95.1%,阳性结果预测值88.4%,阴性结果预测值92.4%。
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  negative results
These procedures eliminate false positive and negative results in determining complex samples containing trace organophosphorus compounds.
      
The estimates are based on the false (or true) rates of positive and negative results.
      
Negative Results in Form-Preserving Approximation of Higher Order
      
The model system can be used to evaluate the sensitivity of a chemical cleavage method and to control false-positive and false-negative results when different protocols are applied to the detection of DNA point mutations.
      
However, these reforms have brought not only positive but also negative results.
      
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  negative result
Testing for the kinematic connection of comets with transplutonian planets yielded a negative result.
      
This negative result is consistent with the quantum Hawking radiation from the horizon, which would lead to a dissipation of the flow.
      
The reason for the negative result can be (1) too optimistic an estimate of the flux (the inclusion of some factors could lower it by 1.5-3 orders of magnitude) and (2) the poisoning of the catalyst by capture of nuclei with Zn≥10.
      
This negative result is important in indicating what factors should be included in an effective psychosocial intervention.
      
???The negative result of our prospective study does not contradict the assumption that infection with Chlamydia pneumoniae may enhance the progress of atherosclerosis in single cases.
      
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  negative finding
A false-negative finding on initial CT is reported in a case of supratentorial glioma.
      
Of the nine studies, six yielded a positive result suggesting that acupuncture is effective, and three produced a negative finding implying that acupuncture is not superior to control treatment.
      
This negative finding indicates that vermian abnormalities undoubtedly seen in some schizophrenic patients may constitute a subsyndrome, possibly related to autistic disorders in which cerebellar abnormalities are well corroborated.
      
This negative finding may be related to the relatively short duration of the diabetic state.
      
This negative finding supports the notion that GABAergic inhibition in the PN of rats, unlike that of higher mammals, is exclusively based on extrapontine GABAergic afferents.
      
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The mutagenicity of Alkyl phenoxy-polyethoxy ethanol(74 1)contraceptive films wastested on mutant Salmonella and E.coli microsome system.The Salmonella Typhimuriumstrain TA 1535,TA 1537,TA 1538,TA 98 and TA 100 were mutants requiring histidineand E.coli strains WP 2,WP 2 UVrA,CM-891,ND-160 and MR2-102 were mutantsrequiring trytophane and thiamine.The microsomes were isolated from rat liver.Bothspot tests and plate tests were conducted,and known carcinogens MNNG and 2 AAF wereused as positive references.Results...

The mutagenicity of Alkyl phenoxy-polyethoxy ethanol(74 1)contraceptive films wastested on mutant Salmonella and E.coli microsome system.The Salmonella Typhimuriumstrain TA 1535,TA 1537,TA 1538,TA 98 and TA 100 were mutants requiring histidineand E.coli strains WP 2,WP 2 UVrA,CM-891,ND-160 and MR2-102 were mutantsrequiring trytophane and thiamine.The microsomes were isolated from rat liver.Bothspot tests and plate tests were conducted,and known carcinogens MNNG and 2 AAF wereused as positive references.Results of the experimentation showed that the“74 1”contraceptive films and all blanktests consistantly gave negative results,while the known carcinogenic references gave posi-tive results.

用鼠伤寒沙门氏菌组氨酸缺陷型和大肠杆菌突变株及大鼠肝微粒体酶,做活化和非活化平皿点试法和掺入法诱变试验,以检测烷苯聚醇醚(代号741)避孕药膜有无致突变/致癌性。用已知化学致癌物(MNNG,2AAF)做阳性诱变对照。结果:“741”避孕药膜与对照一致,为阴性结果。而已知化学致癌物仍呈现阳性结果。

A series of study on toxicity was conducted of natural pigment extracted from cocoa bean shells. On the basis of the negative results obtained in the experiments, we made the safety evaluation of its pigment. The results showed that in the high dose groups, the average intake of the pigment ranged from 1.129mg/kg bw to 1.378mg/kg bw per day, but there was no significant difference(P>0.05) between the parameters of the experimental groups and the control. An amount of about 0.5~0.8 gm of brown pigment is usually...

A series of study on toxicity was conducted of natural pigment extracted from cocoa bean shells. On the basis of the negative results obtained in the experiments, we made the safety evaluation of its pigment. The results showed that in the high dose groups, the average intake of the pigment ranged from 1.129mg/kg bw to 1.378mg/kg bw per day, but there was no significant difference(P>0.05) between the parameters of the experimental groups and the control. An amount of about 0.5~0.8 gm of brown pigment is usually added into per kg of food in food processing. If a child weighing 25 kg takes 250 gm of food of this kind per day. 5~8mg/kg bw of brown pigment will be absorbed. Although in the high dose groups. rats of both sexes absorbed this kind of pigment 140 times more than man did, no toxic effects were observed. The results of all toxicity tests of the pigment demonstrated neither acute nor chronic toxicity. We consider, therefore, the brown pigment to be safe. as a food additive, and an economic and promising edible natural pigment in food processing.

对可可豆壳中提炼出的天然色素进行了一系列毒性研究。在所有实验取得阴性结果的基础上,对该色素进行了安全评价。结果表明,最高剂量组大鼠平均每天摄入的色素量为1.129 mg/kg bw至1.378 mg/kg bw,各项观察指标与对照组无显著差别(P>0.05)。棕色素一般每公斤食品添加0.5~0.8 g,如果一个体重25公斤的儿童每天吃250g这种食品,则将摄入5~8 mg/kg bw棕色素。现最高剂量组两性大鼠摄入的色素超过人体摄入量的140倍以上,未发现毒作用。根据色素的全部毒性试验结果,未出现急、慢性毒性。我们认为,该棕色素作为食品添加剂是安全的,在食品加工中是一种比较经济和有发展前途的食用天然色素。

214 isolates of Pseudomonas aeruginosa were obtained from the two affiliated hospitals of Hunan Medical College whthin the period between August 1981 and July 1982. All isolates were sero-grouped and phage typed, 92.1% of the isolates could be sero-grouped and 99.5 % were phage typable. The results of combined phage typing and sero-grouping of P aeruginosa revealed that 25 strains (76 isolates) among 214 isolates were found to be the epidemic strains. Most isolates of P. aeruginosa were obtained from specimens...

214 isolates of Pseudomonas aeruginosa were obtained from the two affiliated hospitals of Hunan Medical College whthin the period between August 1981 and July 1982. All isolates were sero-grouped and phage typed, 92.1% of the isolates could be sero-grouped and 99.5 % were phage typable. The results of combined phage typing and sero-grouping of P aeruginosa revealed that 25 strains (76 isolates) among 214 isolates were found to be the epidemic strains. Most isolates of P. aeruginosa were obtained from specimens taken from patients and a few of them were cultivated from the facilities of the wards. These results suggest that the source of infection of P. aeruginosa in these two hospitals was not only from the patients per se, but also from the contaminated instruments.

本文对214株绿脓杆菌进行了血清学分群和噬菌体分型。血清学分群率为92.1%。最常见的血清群为第Ⅰ、第Ⅲ和第Ⅴ群。噬菌体分型率为99.5%。对绿脓杆菌在本院内的感染作了初步的流行病学调查;病人大便和咽部带菌率分别为2.0%和1.3%,环境采样的培养大多为阴性结果。本次调查表明我院内绿脓杆菌感染是以自身感染方式发生。

 
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