Chemotaxis ( chemotactic movement ) a txis in response to a chemical concentration gradient 趋化现象：一种对化学浓度梯度的趋化反应。
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A kind of new intelligent collective optimization method , bacterial colony chemotaxis ( bcc ) algorithm based on the description of bacterial colony chemotaxis , is presented 提出一种新型的智能群体优化方法?细菌群体趋药性优化算法。
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Taken together , our study suggests that ( - arrestin2 can function not only as a regulator of cxcr4 signaling but also as a mediator of sdf - 1 ( - induced chemotaxis and this is probably via the ask1 / p38 mapk pathway 综上所述， - arrestin2参与介导了cxcr4引起的趋化作用，这种作用可能是通过调节p38mapk / ask1信号通路来实现的。
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Key experiments that validate mathematical models are also discussed , as well as molecular , cellular , and developmental systems biology , bacterial chemotaxis , genetic oscillators , control theory and genetic networks , and gradient sensing systems 同时，亦会讨论能验证数学模型的重要实验，同时也讨论分子生物学、细胞生物学、发育系统生物学、细菌趋化性、基因震荡器、控制理论、基因网络和梯度感应系统等。
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Abstract : the anti - inflammatory effect of n - butanol extract of xanthocerassorbifolia bunge ( bex ) was studied in this paper . the ear edema resulted from dimethyl benzene , paw edema induced by carrageenin , the increase of vascular permeability caused by acetic acid , the chemotaxis of wbc induced by cmc and the weight of cotton granuloma in mice and hind paw edema induced by fresh egg white in rats were inhibited significantly by ig bex daily for 7 days , respectively . the carrageenin - induced paw edema was also inhibited markedly in adrenal - ectomiced mice . no changes in weight of adrenal and the concentration of vitamin c were observed , indicating that the anti - inflammatory effect of bex was not related to pituitary - adrenal system 文摘:文冠木正丁醇提取物对二甲苯致小鼠耳肿胀、蛋清致大鼠足肿胀、角叉菜胶致小鼠足肿胀、醋酸致小鼠腹腔毛细血管通透性增加、小鼠羧甲基纤维素囊中白细胞游走、小鼠棉球肉芽肿生长均有显著的抑制作用，同样剂量下，文冠木正丁醇提取物对角叉菜胶致去双侧肾上腺小鼠足肿胀仍有显著的抑制作用，且对小鼠肾上腺重量及肾上腺中维生素c的含量没有明显影响。
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We focused on the following aspects ; 1 ) we first assayed the expression of complement receptors and complement - associated molecules on distinct subsets of dendritic cells during their development in order to understand the physical basis of the sensitivity of dendritic cells to complement and its split products ; we next studied the effects of complement activation on the survival of dendritic cells during their development ; and finally examined the effects of the whole complement system , focusing on the ability of one of the split products of complement activation , c5a , and its first subcomponent - c1q , to influence chemotaxis of dendritic cells , as well as allo - t cell stimulatory activity of dc 我们通过免疫磁珠分离了两种人dc前体，即髓系来源的单核细胞( monocytes ， mo )和淋巴系来源的浆细胞样dc ( plasmaeytoiddendriticeells ， pdc ) ，对这两个不同dc亚群进行体外诱导培养，使其处于不同的分化发育阶段，然后检测了其表达补体受体一cd35 ( cri ) 、 cd21 ( crz ) 、 cdilb ( cr3 ) 、 cdlle ( cr4 ) ，补体调控蛋白一cd46 、 cd55 、以及部分补体片断分子受体一c3ar 、 csar 、 clqrp的水平。
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Chemotaxis mediated by chemokine receptors , such as cxcr4 , play a key role in lymphocyte homing and hematopoiesis as well as in breast cancer metastasis . we have previously demonstrated that ? - arrestin2 functions to attenuate cxcr4 - meidated g protein activation and to enhance cxcr4 internalization . here we further show that expression of ( - arrestin2 in both hela and hek293 cells significantly enhanced the chemotactic efficacy of stromal - cell derived factor 1 ( ( sdf - 1 ( ) , the specific agonist of cxcr4 - arrestin2是趋化因子受体的一种重要的调节蛋白，本研究工作发现在hek - 293或hela细胞中升高- arrestin2的表达水平会显著增强cxcr4介导的趋化作用，反之当- arrestin2的表达被它的反义核苷酸或rnai所抑制， cxcr4介导的趋化作用则被明显抑制。
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While the suppression of ( - arrestin2 endogenous expression by antisense or rnai technology considerably attenuated sdf - 1 ( - induced cell migration . expression of ( - arrestin2 also augmented chemokine receptor ccr5 - mediated but not egf receptor - mediated chemotaxis , indicating the specific effect of ( - arrestin2 与此相似，另一种趋化因子受体ccr5介导的趋化作用也受- arrestin2的调控，但egf受体介导的趋化作用则不受- arrestin2的调控，说明- arrestin2的作用有一定的受体特异性。
