阳性选择决定了成熟T细胞的MHC限制性，阴性选择使机体获得自身免疫耐受。
The MHC restriction of t cell is determined in positive selection. The tolerance of t cells to autoantigen is acquired during negative selection.
准种的演变不仅是机体阳性选择压力的结果，也有阴性选择的参与，即随机突变积累的结果。
The evolvement of quasispecies is not only the result of positive immune pressure in the host, but also the accumulation of random mutation.
在其他语言中，当复数总是阳性或阴性时，就没有这种选择了。
That option is unavailable when the plural is always masculine or feminine in other languages.
一种是选择完全不干预，这可能会导致母婴之间的高传播率，出现为数众多的HIV阳性的儿童。
One is the option of no intervention at all, which can lead to high levels of MTCT, and a large population of HIV positive children.
对于HIV阳性的母亲，应告诉她不同婴儿喂养方式的利弊和风险，并帮助她作出最合适的选择。
An HIV positive mother should be counselled on the risks and benefits of different infant feeding options and should be helped to select the most suitable option for her situation.
人们在灵性上已经变得停滞不前，由于他们选择压抑他们的黑暗面、阳性面和使用他们三个较低的脉轮而不能进化。
The people had become spiritually stagnant, unable to progress due to their choice to suppress their dark side, masculine side and use their three lower chakras.
结论：急性药物试验安全可行，无明显毒副作用，可作为VLP阳性患者选择合适抗心律失常药物的初步筛选试验。
Conclusion: Acute drug trial is safe and feasible. The trial can be used as initial screening trial to select suitable AAA for VLP positive patIents.
方法随机选择25例男性患者作平板运动试验，其中14例为阳性，11例为阴性。
Methods 25 male patients were randomly selected to do plate movement test. 14 patients were positive and 11 patients were negative.
方法选择运动试验阳性患者100例与CAG情况进行分析比较以便提高临床诊断符合率。
Methods Choose 100 positive patients of exercise test and compare them with the cases of coronary angiography (CAG)so as to raise the rate of conformity in clinical diagnoses.
净现值(净现值)的分析，应选择的解决方案，提供了最高阳性核型多角体病毒。
A net present value (NPV) analysis should be performed to select the solution that provides the highest positive NPV.
HIV阳性母亲在喂养选择方面缺少建议和支持也导致母婴传播率高企。
Lack of counselling and support for HIV-positive mothers in their feeding choices has also been blamed for the high number of mother-to-child infections.
所以首先区分病原菌是革兰氏阳性菌还是阴性菌，在选择抗生素方面意义重大。
Distinguish above all so bacterium of cause of disease is bacterium of positive of change orchid family name or electronegative bacterium choosing antibiotic respect meaning great.
方法：通过对不同冲洗条件下各组阳性菌生长情况以及冲洗耗时的比较，选择出一种时间短、效果好的冲洗条件。
Method; a kind of condition, which consumes time shortly and has good effect, was found by the compare for growth of every masculine bacterium and washing time.
方法选择5 0名因外伤行CT检查无任何阳性发现的病例作为正常组，测量其腰椎管斜径以得出正常值。
Methods 50 patients examined with CT for wounded and without any positive findings were selected as healthy group, the oblique diameters of lumbar spine were measured.
结果对照组大鼠重要脏器中P-选择素除了在肺中有少量表达外，其他脏器未见阳性表达，血清中的P-选择素有表达。
Results Before traumatic shock, P-selectin was scarcely detected in the vital organs except the lungs, and the serum was positive for P-selectin expression.
联苯胺阳性细胞数在HAT选择性培液筛选后数量增加。
The numbers of benzidine positive staining cells were increased after incubation in the HAT selective medium.
采用选择离子进行阳性确证。
经选择再分化实验，选择出长势及卡那霉素抗性最优的24个无菌株系，经PCR检测均为阳性。
Through differentiation, we selected 24 excellent lines to PCR test. All the lines were positive in PCR.
结果以选择性冠状动脉造影结果为标准，活动平板试验敏感性为66.7%，特异性为87.6%，阳性预测值为77.8%，阴性预测值为80.1%。
Results Sensitivity, specificity, positive and negative predictive values of treadmill exercise test for diagnosing CAD were 66.7%, 87.6%, 77.8% and 80.1%, respectively.
结论肌电图检查是诊断dm的重要手段，选择股四头肌、胫前肌及肱二头肌进行EMG检查阳性率最高。
Conclusion EMG may be an important means of diagnosing DM. Selection of quadriceps, biceps and anterior tibial muscles for EMG may be helpful in increasing the positive rate of EMG.
细菌培养阳性者根据药敏试验选择恰当的抗生素静滴。
The patients electropositive germiculture received appropriate antibiotics to mainline , according to pharmic susceptive experimentation.
方法：以选择性头部低温为阳性对照。
METHODS: Selective cerebral hypothermia is taken as a positive contrast.
选择在两种培养条件下形态良好的细胞，接种流感阳性标本，比较二者的阳性分离率差异及病毒效价。
The cells with good morphology of the two groups were inoculated with the influenza-positive specimens, and then the positive rate and virus titers were compared between the two groups.
对选择内分泌治疗，应根据ER和PR的表达及临床参数，对绝经后患者术后er和PR阳性者及绝经前的患者有益。
The endocrine therapy should be based on er and pr expression and clinical parameters, which are benefit for the patients with postmenopausal and er and PR-positive and the premenopausal patients.
对选择内分泌治疗，应根据ER和PR的表达及临床参数，对绝经后患者术后er和PR阳性者及绝经前的患者有益。
The endocrine therapy should be based on er and pr expression and clinical parameters, which are benefit for the patients with postmenopausal and er and PR-positive and the premenopausal patients.
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