路氏乳杆菌JCM1081黏附相关蛋白的初步鉴定

目的研究路氏乳杆菌(Lactobacillus reuteri,也称罗伊氏乳杆菌)JCM1081菌体表面蛋白对其黏附HT-29细胞的影响。方法将路氏乳杆菌JCM1081菌体进行胰蛋白酶、蛋白酶K处理;用氯化锂和盐酸胍对乳杆菌表面的蛋白进行抽提,进行SDS-PAGE后与黏蛋白受体进行Western blot,并对杂交阳性蛋白进行质谱分析鉴定。结果路氏乳杆菌JCM1081菌体经胰蛋白酶、蛋白酶K处理后,其对HT-29细胞的黏附力显著下降(P<0．01);用氯化锂去除路氏乳杆菌JCM1081菌体外表面的S层蛋白后,路氏乳杆菌JCM1081对HT-29细胞的黏附力无显著变化;Western blot结果显示相对分子质量(Mr)为29×103和14×103的两种菌体表面蛋白与黏蛋白受体杂交中出现了强阳性;质谱分析结果显示29×103蛋白与路氏乳杆菌ATCC55730的h0793蛋白相似性高达71．1％。结论路氏乳杆菌JCM1081菌体表面的蛋白参与了乳杆菌的黏附,其中29×103和14×103的两种胞壁表面蛋白能够特异地识别黏蛋白受体并与之结合,29×103蛋白属ABC转运蛋白家族。     

Deletion of stem-loop 3 is compensated by second-site mutations within the Gag protein of human immunodeficiency virus type 1

Encapsidation of human immunodeficiency virus type 1 (HIV-1) RNA involves specific interactions between viral Gag proteins and viral RNA elements located at the 5' untranslated region (UTR). These RNA elements are termed packaging (psi) or encapsidation (E) signals and mainly comprise the stem-loop 1 (SL1) and SL3 RNA structures. We have previously shown that deletion of the SL1 sequences is compensated by second-site mutations within Gag. Similar studies are now extended to SL3 and the results demonstrate that deletion of this RNA structure is rescued by two point mutations, i.e., A11V in p2 and I12V in nucleocapsid (NC). These two compensatory mutations are different from those associated with the rescue of SL1 deletion, suggesting that SL1 and SL3 may bind to different residues of Gag during viral RNA packaging. Analysis of virion-derived RNA in native agarose gels shows that deletion of SL3 leads to decreases in both viral RNA packaging and dimerization. These defects are corrected by the compensatory mutations A11V and I12V. Yet, defects in viral RNA dimerization at an early stage that were caused by the SL3 deletion in the context of a viral protease-negative mutation cannot be overcome by these two suppressor mutations. Therefore, the positive effects of A11V and I12V on dimerization of the SL3-deleted RNA must have taken place at the maturation stage.     

The study of tuberculosis outbreak in a high school—Shanghai,China, 2017–2018

Journal of Public Health - To investigate the attack rate of active tuberculosis (TB) cases and detection rate of latent tuberculosis infection (LTBI) cases, and to identify possible factors...     

Discrete choice experiment with duration versus time trade-off: a comparison of test–retest reliability of health utility elicitation approaches in SF-6Dv2 valuation

Quality of Life Research - To evaluate and compare the test–retest reliability of discrete choice experiments with duration (DCETTO) and time trade-off (TTO) in the Chinese SF-6Dv2 valuation...     

纳洛酮抢救海洛因中毒618例临床分析

目的：观察纳洛酮抢救海洛因中毒的疗效。方法：对618例海洛因中毒患,用纳洛酮抢救,首次剂量给纳洛酮针剂0．4－0．8mg静注,然后以0．4mg每5min1次,直到患清醒后再给0．8－1．2mg维持静滴。结果：618例中死亡9例,抢救成功率达98％。结论：纳洛酮是抢救海洛因中毒的理想特效药。     

恒河猴tPA基因的克隆、测序与真核表达

本试验采用高浓度乙二醇（EG-8）作为胚胎冷冻保护剂,以高浓度的半乳糖作为解冻稀释液,对MMTV-Wnt-1转基因小鼠的早期囊胚进行玻璃化冷冻保存。结果在EG-2中平衡4-6min和解冻时间为3-5min时获得了最佳冷冻效果。此条件下冷冻胚胎的总回收率为88.61%（109/123）;回收胚胎在体外发育率达88.99%（97/109）;孵化率达81.65%（89/109）;发育胚胎的移植出生率为38.36%（69/181）;冷漠胚胎移植出生后经PCR检测一半小鼠整合阳性。结果表明使用高浓度的乙二醇作为冷冻保护剂和以高浓度的半乳糖作为冻稀释液能有效地保存转基因小鼠胚胎。     

社区精神分裂症综合式家庭干预对照研究

目的：了解综合式家庭干预对社区精神分裂症患者和家属的效果。方法：在宝山区随机抽取186例精神分裂症进行一年的综合式家庭干预对照研究,干预组86例接受综合式家庭干预和常规社区服务,对照组100例仅接受常规社区服务。结果：干预组患者年复发率下降47．3％,社区功能明显改善,干预组家庭对有关疾病知识增长,心理状况改善,照料负担减轻,与对照组比较效果显著。结论：综合式家庭干预对精神分裂症患者家属有良好的效果,应纳入常规社区服务。     

高血压病以昼夜血压模式指导治疗初探

目的：探讨高血压以昼夜血压模式指导药物治疗的疗效。方法：124例高血压患者被随机分为两组：观察组80例,采用以昼夜血压模式为依据,指导选用药物进行治疗,着重加强异常升高血压部份的降压治疗,同时加强血压监测;对照组仍按照常规方法治疗,6周为1疗程,治疗前和治疗后都检测血压和24小时动态血压。结果：观察组降压的总有效率和昼夜血压模式转为正常杓形态明显高于对照组,结论：高血压病患者以昼夜血压模式为依据指导用药降压治疗有较好的医疗效果。