Study on lymphocyte activation and proliferation induced by anti-CD3 McAb

Summary T cell activation and proliferation via CD₃-TCR complex were investigated by lymphocyte DNA synthesis in vitro. Several interfering factors were also discussed. The result indicated that lymphocyte activation and proliferation are calciumdependent. A rise of cytoplasmic free Ca²⁺ quickly following activation with CD₃ McAb is mainly due to intracellular mobilization of Ca²⁺, while lymphocyte proliferation needs both intracellular mobilization of Ca²⁺ as well as influx of extracellular Ca²⁺. It was confirmed that CTX sensitive G protein plays a role in regulating T cell proliferation by pretreatment with CTX suppressing lymphocyte³H-TdR incorporation obviously. PLC and PKC inhibitor neomycin and P. S. S could also decrease T cell proliferation.     

Norephedrine (phenylpropanolamine) stimulates oxygen consumption and lactate production in the perfused rat hindlimb

d,l-Norephedrine (phenylpropanolamine) which is both a demethylated analogue and a metabolite of d,l-ephedrine, is a reputed anorectic agent. In the present study the proposed most active isomer of this mixture, l-norephedrine has been assessed as a peripherally acting thermogenic agent in the isolated perfused rat hindlimb. l-Norephedrine produced a dose-dependent increase in oxygen uptake and perfusion pressure and increased lactate production. Whereas propranolol potentiated the increase in oxygen uptake and perfusion pressure produced by l-norephedrine, prazosin significantly and nitroprusside totally inhibited both of these changes. Nitroprusside also completely inhibited the increase in lactate production. We conclude that norephedrine has a hitherto unrecognized peripheral thermogenic activity in the perfused rat hindlimb resulting from its interaction with alpha 1 adrenergic receptors that control vasoconstriction in this tissue.     

合肥市部分人群SARS认知及行为态度

目的　了解合肥市部分人群对 SARS的认知情况及行为态度。方法　对合肥市两个社区及一所大学的部分人群共 1332人进行现况调查 ,比较不同性别、职业、文化程度对 SARS的总体认知水平。结果　合肥市人群对 SARS的认知情况尚好 ,总体平均得分 ( 15 .0 2± 1.98)分 (总分 18分 )。结论　合肥市居民对 SARS的认知水平总体较高 ,但存在群体差异 ,卫生行政部门应加强对公众的宣传教育 ,以提高全体居民的健康意识 ,进而预防 SARS的发生     

日晒海盐工人机体内高镁反应

报道福建某盐场从事日晒海盐生产人工机体内高镁对心血管系统的影响，通过现场空气、饮水、主良的镁含量测定，并对进入机体途径进行分析，得出空气、卤水接触、饮水为机体镁增高的主要来源。不同对象头发镁含量测定结果显示，以接触卤水、劳动强度大的盐工最高，并随机体内镁含量增高，出现血压偏低、心率减慢、心电图Ｐ－Ｒ间期延长、ＱＲＳ波增宽、Ｔ波高尖等机体高镁反应，与临床高镁血症相似。     

广东汉族人群HLA-Cw多态性及单体型分析

目的检测广东汉族人群HLA．Cw及HLA-A、B、DRB1基因频率，分析该人群HLA-Cw等位基因多态性及其单体型特点。方法骨髓移植供者185例，抗凝血提取DNA，半量全自动PCR-RSSO分型检测HLA-A、B、Cw、DRB1基因型。结果在分辨水平检出Cw等位基因11个，其中分布频率较高的依次为：Cw*03(0．2580)、Cw*07(0．1887)、Cw*01(0．1732)、Cw*08(0．1070)。统计分析呈现显著连锁不平衡的HLA-Cw．A单体型7个，HLA-Cw-B单体型20个，HLA—Cw．DRB1单体型10个。结论广东汉族群体HLA-Cw基因具有较为丰富的多态性，其与HLA-A、B、DRB1间连锁不平衡单体型具有地区性遗传特征。     

大鼠全脑照射后早期血清S-100B变化特征

目的 观察大鼠全脑不同剂量照射后1月内不同时间点血清中S-100B的变化,以探讨S-100OB在早期放射性脑损伤中的变化特征.方法 对大鼠予4 MeV电子线分别单次全脑照射2、10和30 Gv制备大鼠早期放射性脑损伤模型.采用酶联免疫吸附试验(ELISA)检测照射后1 h、6 h、12 h、24 h、3 d、1周、1个月血清中S-100B的浓度.结果 大鼠血清S-100B浓度在照射后6 h升高最明显,照射后12 h浓度下降,照后24 h再升高(除外2 Gy组为在照射后3 dR升高),随后下降直到最后观察时间点.结论 大鼠全脑照射后血清S-100B水平发生了变化,不同剂量组血清S-100B浓度有显著性差异,剂最越高,浓度越高.结果 提示S-100B可能会成为检测早期放射性脑损伤的重要血清指标.     

抗龋IgY和IgY牙膏对体外培养细胞影响的形态学观察

目的：了解抗龋IgY和IgY牙膏对体外培养细胞的影响。方法：体外培养人成纤维细胞（human skin fibrobasts,HSF）和中国仓鼠卵巢癌细胞（chinese hamster ovary,CHO），分别经不同浓度的抗龋IgY和IgY牙膏处理后常规培养，通过倒置显微镜和电子显微镜观察细胞生长情况和细胞超微结构。结果：经抗龋IgY处理的HSF和CHO细胞生长旺盛，超微结构无变化；经抗龋IgY牙膏处理的HSF和CHO细胞加药后部分细胞出现变圆或脱落、细胞生长缓慢和细胞器变性等变化，第2天恢复良好生长状态。结论：抗龋IgY对体外培养细胞生长、形态无影响；抗龋IgY牙膏中的某些成分可能对培养细胞有短暂的不良影响。     

重视患者知情同意权提高医疗服务质量

为了提高医院的医疗服务质量，保证医疗安全，避免和减少医疗纠纷，医院必须严格遵守患者知情同意原则。作者着重讨论知情同意的意义，如何规范知情同意书的范围、格式和内容，以及填写注意事项等问题。