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- Through positive and negative selection, the thymocytes with high avidity for self peptide-MHC complex were eliminated, but retained low but significant reactivity for self-peptides. 近年有关外周T细胞群体存活与稳态的深入研究发现:抗原活化前T细胞的存活需要自身肽MHC复合物的作用以提供适度的存活信号;
- Switched capacitor( SC) unit delayer, positive negative proportors and adder were designed using two phase clocks. 用二相时钟设计了对寄生电容低灵敏的开关电容单位延时器、负比例器和加法器.
- Hybrid supercapacitors were fabricated using Ni (OH)_2 positive negative and electrodes of activat- ed carbon. 以Ni(OH)_2和活性炭为正负极组成复合电化学电容器。
- Because thymic dendritic cells are the potent antigen presenting cells in the thymus, they must play an important role in thymic negative selection. 胸腺树突状细胞作为胸腺内功能强大的抗原呈递细胞,在阴性选择中必定发挥着不可忽视的作用。
- Methods Using positive negative blend grouping to detect ABO blood group, and compared with normol subjects. 方法用临床常规的正反定型法对病人ABO血型检测，并与正常人血型对照。
- During breeding for vertical resistance, horizontal resistance tends to decline because of negative selection pressure. 当培育垂直抗性时，由于负的选择压力，水平抗性趋于下降。
- The Heavy Duty pressure gauges with capsule element are used to measure small positive negative gauge pressures in gaseous media. 膜盒压力表用于测量气体介质的正负微过压。
- The DCs in the thymus have )been subdivided into two populations, lymphoid DCs and myeloid DCs.They can induce negative selection of effective T cells and positive selective of regulatory T cells. 胸腺中树突状细胞分为淋巴源性和髓源性,参与效应性T细胞的阴性选择和调节性T细胞的阳性选择过程。
- It was found that the coinci- deuce of immunohistochemistry and western blotting with the true positive negative cases is 100%, and the co- incidence of ELISA is somewhat lower. 通过比较发现免疫组化及免疫转印法与标准品真实情况的符合率均为100%25，ELISA的符合率稍差。
- The process of thymic negative selection is the process of the central immunologic tolerance, namely the process of autoreac-tive thymic cells being deleted or becoming allergy. 胸腺内阴性选择的发生过程也就是中枢免疫耐受的形成过程,即自身反应性胸腺细胞被克隆清除或处于免疫无能状态的过程。
- The first two coupled regimes are characterized by the relationships between the warm cold phase of ENSO episodes and positive negative phase of PNA patterns. 第一个和第二个耦合流型域以ENSO事件冷暖位相与北太平洋／北美区的正负位相PNA型之间的关系为主要特征。
- The mathematical model of the constrained positive negative term geometrical programming duality method, the relationship between the original and the duality programming, and the algorithmic steps are briefly reviewed. 本文对约束正负项式几何规划对偶法的数学模型、规划问题和对偶规划问题之间的关系和算法步骤作了简要介绍。
- Dendritic cell and thymic negative selection 树突状细胞和胸腺阴性选择
- There is positive proof that he did it. 有确切的证据证明他做了此事。
- In this paper, negative selection algorithm for artificial immune system (AIS) is improved by adopting genetic algorithm, in which Euclidean distance is selected as fitness function, to generate detectors (antibodies). 摘要将人工免疫系统的反面选择算法作了改进，在产生检测器时，利用了遗传算法，并将欧几里德距离作为遗传算法中的适应函数。
- positive negative ambivalent quotient 正负矛盾情绪商
- multi - level negative selection 多级否定选择
- PNPB positive negative pressure breathing 正负压呼吸
- negative selection in cell culture 增减细胞负选择法
- positive negative pressure ventilation 正负压通气
