青滕碱对豚鼠心肌动作电位和收缩力的影响

青藤碱2.7μmol/L以上,呈浓度依赖性地降低豚鼠乳头肌收缩力,延长动作电位时程和有效不应期。小剂量时,青藤碱能降低动作电位0相上升最大速率;较大剂量时,动作电位幅度也降低。用TTX处理豚鼠乳头肌所致的慢反应电位,青藤碱能够抑制。此外,青藤碱能对抗乙酰胆碱缩短豚鼠左房肌动作电位时程的作用。结果提示:青藤碱对Na⁺,Ca²⁺和K⁺的跨膜转运均有抑制作用。     

易清洗操作的折流式连续逆流提取机

主要介绍一种易清洗操作的折流式连续逆流提取机和长槽法兰紧固件，     

噪声中EP信号的提取算法及研究进展

诱发电位的提取是脑电信号处理领域的前沿课题近年来 ,通过少次甚至单次试验提取诱发电位已经成为研究的主流。本文对近年来提取诱发电位的信号处理方法进行了简要的回顾 ,并分别从小波变换、神经网络、高阶累积量、独立分量分析等四个方面对算法进行了介绍     

主成份分析与因子分析用于多指标综合评价

本文从应用角度阐明了主成份分析与因子分析用于多指标综合评价的异同点，并用实例加以说明。提出了主成份分析和因子分析用于多指标综合评价时，应在能明确主成份或因子的意义和方向情况下加权，否则会得到错误的结果。     

Secretion and function of the third component of complement (C3) by murine leukocytes.

Our new finding of de novo synthesis and secretion of C3 by both murine peritoneal macrophages and polymorphonuclear leukocytes (PMN) was confirmed by the incorporation of [35S]methionine into C3 molecules and their complete inhibition by cycloheximide. The methods of secretion of C3 from these two types of cells were compared by examining the C3 contents in their culture supernatants. Completely different modes of secretion were observed, i.e. although macrophages synthesize and secrete C3 constitutively, PMN has a mechanism to store the already synthesized C3 in the cell and secrete it in response to stimuli. Protein kinase C (PKC) activators, e.g. 12-O-tetradecanoyl-phorbol 13-acetate, dioctanoyl glycerol, and mezerein, as well as calcium ionophore A23187 stimulate the secretion of C3 from PMN. These results suggest the involvement of PKC and the calmodulin pathway. A very sensitive method for measuring C3 activity was developed which enabled us to show for the first time that C3 secreted by PMN had opsonizing activity and that particles cultured with PMN were phagocytosed effectively.     

乳腺癌广泛导管内癌成分与组织蛋白酶D Ki-67及单链DNA表达的关系及临床意义

目的 探讨乳腺癌广泛导管内癌成分（extensive intraductal component，EIC）、粉刺状坏死（comedo necrosls）、组织学分级与组织蛋白酶D（eathepsin D）、Kiab7、单链DNA（ssDNA）及c-erbB-2表达的关系。方法检测日本德岛乳腺门诊与东德岛医院1996年1月至1997年4月连续手术切除的59例乳腺浸润性导管癌标本。用免疫组化方法，检测59例乳腺浸润性导管癌中组织蛋白酶D（eathepsin D）、Ki-67、单链DNA及c-erbB-2的表达。结果EIC阳性组，肿瘤上皮细胞中的组织蛋白酶D为高表达（P=0．021），肿瘤间质细胞中的组织蛋白酶D表达差异无显著性意义。粉刺状坏死的出现，与c-erbB-2癌基因、肿瘤上皮细胞中的组织蛋白酶D和细胞增殖指数相关（P分别为0．042，0．006及0．013）。结论肿瘤上皮细胞中的组织蛋白酶D可能参与了EIC与粉刺状坏死的形成。EIC与粉刺状坏死的检测有临床应用价值。     

CS-3000 plus血细胞分离机在治疗性血液成分单采中的临床应用

【目的】观察应用CS-3000plus血细胞分离机进行治疗性血液成分单采的临床疗效，分析影响血液成分单采效果的相关因素。【方法】对87例患者应用CS-3000plus血细胞分离机进行161次治疗性血液成分单采，分析临床效果和实验室指标的改善情况。【结果】应用CS-3000plus血细胞分离机进行血浆置换后，71．43％患者临床症状、体征或者实验室指标取得明显改善。相关分析提示，进行治疗性血细胞成分单采患者的白细胞、血小板、红细胞、血红蛋白、红细胞比容下降值与采前相应初始值均呈正相关（P〈0．05）。白细胞单采术的患者白细胞计数下降值与处理全血量呈正相关（P〈0．05），在处理血量达到5000～7000ml时，血小板单采术患者血小板计数下降值与处理全血量无明显相关性（P〉0．05）。当处理全血量达到500～800ml时，红细胞单采术患者红细胞、血红蛋白、红细胞比容下降值与处理全血量无明显相关性（P〉0．05）。【结论】应用CS-3000plus血细胞分离机进行治疗性血液成分单采对迅速缓解临床症状，减少并发症的发生和提高临床药物治疗效果均有较大意义。合理设定全血处理量，调整采集相关参数，有助于采集的顺利进行和采集效果的进一步提高。     

几种抗艾滋病中药有效成分对解脲支原体和白色念珠菌体外抑制作用的实验研究

目的筛选对解脲支原体和白色念珠菌体外有明显抑制作用的抗H IV中药有效成分,为治疗H IV继发感染或性病奠定基础。方法以微量稀释法测定9种中药有效成分对解脲支原体和白色念珠菌的M IC50和M IC90,同时测定其中6种中药有效成分对H IV-1的EC50和TI值。结果所测药物对解脲支原体、白色念珠菌及H IV-1均有一定的抑制作用,对解脲支原体和白色念珠菌作用最好的分别是三七总皂苷、三七叶皂苷和化合物A,化合物A对H IV-1的抑制作用最好,其EC50为0.09,TI值大于10 000。结论化合物A对解脲支原体、白色念珠菌及H IV-1的抑制效果最好,值得进一步研究。     

A case report of deficiency in an inhibitor of calcium-dependent association of protein S with C4B-binding protein suggested by a modified crossed immunoelectrophoresis

We have experienced a coagulation factor VIII-deficient patient whose plasma has normal protein S (PS) activity and masses of free PS and its bound form in complex with C4b-binding protein (C4BP). Although the patient's plasma showed a normal ratio of free PS to PS-C4BP complex in the presence of 5 mM EDTA, the plasma gave an abnormally retarding major C4BP peak together with a major PS peak in the crossed immunoelectrophoresis (CIE) in the presence of 2 mM CaCl₂. It was revealed that the major peak was formed by a mixture of PS-C4BP complex and free form. The addition of normal human plasma (NHP) to the patient's plasma inhibited the retardation of the major PS-C4BP complex. These suggest that the patient's plasma lacks some component(s) to inhibit Ca²⁺-dependent association of PS with C4BP.     

茶叶多糖的研究进展

茶叶多糖是一种复合杂多糖，具有许多生物活性。作者系统地介绍了茶叶多糖的提取、分离、纯化、纯度鉴定及相对分子质量测定的方法，以及其含量和组成、理化性质、化学结构及空间构象、生物活性等方面的研究进展，并对上述方法及研究进展进行了分析和评述。