A novel early effect of concanavalin A on thymocytes.

Concanavalin A, added to freshly isolated rabbit thymocytes, markedly enhanced the extracellular appearance of non-immunoglobulin proteins. Time course studies revealed that the onset of enhancement occurred virtually without delay. The effect appeared to be restricted only to certain of the thymus-derived cells because thymocytes obtained from rabbits treated with hydrocortisone, as well as splenocytes derived from untreated rabbits essentially did not exhibit the enhancement. Stimulation by concanavalin A was specific in that pokeweed mitogen and lipopolysaccharide were without effect and also in that α-methyl-mannoside, but not galactose, abrogated the concanavalin A-mediated enhancement. Experiments with mouse thymocytes demonstrated that the cells which responded to concanavalin A were primarily cells that bear the θ-antigen on their surface (T-cells).     

福氏2a痢疾菌LPS经两种方法解毒后与破类制成结合物的比较

福氏２ａ痢疾菌ＬＰＳ经两种方法解毒后与破类制成结合物的比较本文报道了将痢疾杆菌福氏２ａ型ＬＰＳ经两种方法解毒后与破伤风类毒素制备成结合物的理化和免疫学性质。将痢疾杆菌福氏２ａ型的ＬＰＳ通过醋酸水解（切断ＫＤＯ和类脂Ａ之间的键）和酰肼水解（切断类脂Ａ上...     

Effect of Concanavalin A on Phagocytosis

Concanavalin A has been shown to inhibit phagocytosis by polymorphonuclear leucocytes. The effect is reversed by specific sugars.     

嗜热放线菌多肽电泳图谱的研究

嗜热放线菌是引起农民肺的主要病因,但其致病菌株可有多种。我们应用ＳＤＳ－ＰＡＧＥ技术对引起农民肺的三株嗜热放线菌的电泳图谱进行了对比分析,发现这三种嗜热放线菌多肽的电泳图谱各不相同,都具有特征性的主要带型。实验结果表明ＳＤＳ－ＰＡＣＥ技术有助于快速鉴定嗜热放线菌菌种。     

口服IgA聚合体预防霍乱弧菌在新生小鼠体内的定居

口服ＩｇＡ聚合体预防霍乱弧菌在新生小鼠体内的定居作者分离纯化了对霍乱弧菌ＬＰＳ特异的单克隆ＩｇＡ并得到其单体和聚合体,采用新生小鼠为动物模型研究了ＩｇＡ的被动保护效果,实验证明：对新生小鼠口服攻毒前１小时口服抗霍乱弧菌ＬＰＳ的ＩｇＡ聚合体,能降低弧菌...     

原子力显微镜研究多西他赛对人肺腺癌A549细胞的作用机制

利用原子力显微镜(AFM)研究了化疗药物多西他赛对肺腺癌细胞A549的作用机制。选取了不同浓度多西他赛作用下的A549细胞,观察和分析了多西他赛对A549细胞形貌信息和生物力学特性的影响。结果表明细胞的峰谷差和超微结构的平均粗糙度随着药物浓度增加而减小,表面粘附力随着药物浓度增加而增大。该结果对AFM可作为一种利用纳米量级分辨率进行药物药效评估的工具进行了佐证。     

链黑菌素研究进展

链黑菌素(streptonigrin,STN)是一种由绒毛链霉菌(Streptomyces flocculus)产生的具有独特的氨基喹啉醌式结构的高效抗肿瘤抗生素,在癌症治疗方面具有良好的防治效果和广阔的应用前景。但是,由于链黑菌素具有较为显著的骨髓抑制副作用,限制了其在临床上的广泛应用。综述了有关链黑菌素的抗肿瘤机制、结构特点及链黑菌素及其类似物生物化学合成相关的现有知识和减除毒副作用的研究现状与展望,从而为开发低毒、无毒副作用的链黑菌素及其类似物提供科学参考。     

橡子研究概况

本文论述了橡子的研究概况，包括各主要研究国家和方向，以及橡子中各主要成分的研究介绍。     

重组BCG口服免疫诱导的细胞和体液免疫应答

重组ＢＣＧ口服免疫诱导的细胞和体液免疫应答最近研究证明,外源基因能在牛分枝杆菌ＢＣＧ中表达,用这些重组分枝杆菌免疫小鼠可诱导抗外来蛋白的细胞和抗体免疫应答。近年来的许多研究也证实了肠道和呼吸道粘膜淋巴系统在防御感染方面的贡献,因此,迫切需要能够刺激粘...     

嗜铬颗粒蛋白A研究进展

嗜铬颗粒蛋白A(Chromogranin A,CGA)属于独特的酸性可溶性蛋白质家族,遍布于动物内分泌系统、神经系统和免疫系统,与其他激素和多肽共贮存、共分泌.在CGA上有许多碱性氨基酸对,成为潜在的激素原转化酶切割位点.很多切割产物已经被鉴定,其中有些具有生物学功能.近年的研究表明,在多种病理、生理状态下,CGA及其衍生片段在组织中含量升高,发挥抑制性生理功能或作为疾病诊断指标.嗜铬颗粒蛋白A的N端衍生片段在机体防御系统中的抗菌功能、在心血管系统中的抗血管收缩功能已被阐明,使其作为临床候选药物具有巨大潜力;CGA完整片段在内分泌肿瘤和神经内分泌肿瘤中含量升高,可作为内分泌肿瘤和神经内分泌肿瘤诊断指标,但其在肿瘤发生过程中的作用还未见报道.     

A note on biotopology of reproduction

In a recent paper (Bull. Math. Biophysics, 20, 245, 1958), Robert Rosen applied topological considerations to the study of an organism as a whole. Those considerations have no direct relation to the principle of biotopological mapping. They rather represent a topological model of an organism, especially a model of the repair mechanisms which organisms possess for lost or impaired parts. In this note it is shown that the model introduced by Rosen may possibly be derived from the principle of biotopological mapping plus a proper definition of the primordial. Such a derivation may also provide a clue to a proper biotopological approach to the problem of multiplication of organisms.     

Hib在调理过程中补体成分C_3的外膜蛋白结合位点

Ｈｉｂ在调理过程中补体成分Ｃ_３的外膜蛋白结合位点用从正常人血清（ＮＨＳ）分离出的不同浓度的ＩｇＧ抗体调理Ｉ（１２５）标记的ｂ型流感嗜血杆菌（Ｈｉｂ）菌体,分离纯化出ＩｇＧ－外膜蛋白（ＯＭＰ）复合物。用ＳＤＳ－ＰＡＧＥ和放射免疫沉淀试验进行分析,结果...