Organ distribution of severe acute respiratory syndrome (SARS) associated coronavirus (SARS-CoV) in SARS patients: implications for pathogenesis and virus transmission pathways

We previously identified the major pathological changes in the respiratory and immune systems of patients who died of severe acute respiratory syndrome (SARS) but gained little information on the organ distribution of SARS-associated coronavirus (SARS-CoV). In the present study, we used a murine monoclonal antibody specific for SARS-CoV nucleoprotein, and probes specific for a SARS-CoV RNA polymerase gene fragment, for immunohistochemistry and in situ hybridization, respectively, to detect SARS-CoV systematically in tissues from patients who died of SARS. SARS-CoV was found in lung, trachea/bronchus, stomach, small intestine, distal convoluted renal tubule, sweat gland, parathyroid, pituitary, pancreas, adrenal gland, liver and cerebrum, but was not detected in oesophagus, spleen, lymph node, bone marrow, heart, aorta, cerebellum, thyroid, testis, ovary, uterus or muscle. These results suggest that, in addition to the respiratory system, the gastrointestinal tract and other organs with detectable SARS-CoV may also be targets of SARS-CoV infection. The pathological changes in these organs may be caused directly by the cytopathic effect mediated by local replication of the SARS-CoV; or indirectly as a result of systemic responses to respiratory failure or the harmful immune response induced by viral infection. In addition to viral spread through a respiratory route, SARS-CoV in the intestinal tract, kidney and sweat glands may be excreted via faeces, urine and sweat, thereby leading to virus transmission. This study provides important information for understanding the pathogenesis of SARS-CoV infection and sheds light on possible virus transmission pathways. This data will be useful for designing new strategies for prevention and treatment of SARS.     

针刺对多囊卵巢综合征大鼠卵巢TGF-α、EGFR表达的影响

目的:研究针刺对多囊卵巢综合征(PCOS)大鼠卵巢转化生长因子α(TGF-α)、表皮生长因子受体(EGFR)表达的影响,探讨针刺促排卵的作用机制。方法:24日龄雌性大鼠颈背部皮下注射脱氢表雄酮(DHEA)的油溶液制作(PCOS)模型,对照组同期皮下注射油剂。PCOS大鼠随机分为模型组和针刺组。模型组不作处理,针刺组大鼠从80日龄起针刺关元、中极、双侧三阴交、双侧子宫穴,1次/天,15min/次,连续6周。治疗结束后各组大鼠断头处死,迅速取血并分离血清,-20℃冰箱保存,待测性激素水平。摘取双侧卵巢,称重,4%多聚甲醛固定,作HE染色和免疫组织化学染色。结果:与模型组相比,针刺组卵巢湿重、卵巢TGF-α、EGFR表达及血清睾酮(T)、雌二醇(E2)水平均显著降低(P<0.01),而卵泡刺激素(FSH)、黄体生成素(LH)、孕酮(P4)水平差异无统计学意义(P>0.05)。结论:针刺能显著降低PCOS大鼠卵巢TGF-α及EGFR的表达,抑制TGF-α对卵巢和激素合成的作用,改善PCOS大鼠多囊样变和高雄激素血症,促进排卵。     

药品数量管理与医保系统的关系

原因信息系统与医保系统实现有效接口,促进了药品的数量管理和医生工作站的推广,降低了错误处方的发生率,使医院服务更加顺畅。     

综合性医院冠心病病人抑郁/焦虑现况研究

目的：了解综合性医院冠心病患者抑郁和／或焦虑症状患病率及既往诊治情况。方法：采用现况研究方法，于2004年6月1日到12月1日在北京、上海、广州和成都的7家综合性医院的心内科连续收集确诊的冠心病患者359例。由经培训的调查员用统一的调查表进行面对面调查，同时使用综合医院焦虑抑郁量表（HAD）、Hamilton焦虑量表和Hamilton抑郁量表进行心理测评。结果：冠心病患者的抑郁症状、焦虑症状、抑郁合并焦虑症状以及合计的抑郁和／或焦虑症状患病率分别为19．8％，16．7％，13．6％和22．8％；在具有抑郁和／或焦虑症状的非首诊患者中，冠心病患者既往被诊断为抑郁和／或焦虑障碍和接受抗抑郁和／或焦虑治疗的比例均低于4％：住院患者在本次住院期间的抑郁焦虑诊治率低于1％。结论：综合医院冠心病病人具有较高的抑郁和／或焦虑症状和抑郁和／或焦虑障碍患病率．且既往诊治率较低。     

Preparation and identification of di-block copolymer composed of crystalline poly(ethylene oxide) and noncrystalline poly(vinyl acetate) with well-defined structure

A block copolymer of ethylene oxide (EO) and vinyl acetate (VAc) was prepared by sequential anionic and photo-induced charge transfer polymerization (CTP) using UV sensible p-aminophenoxy end groups on PEO (PEO_a). The structure and composition of this block copolymer (PEO-b-PVAc) were identified in detail. The relationship between polymerization rate (R_p) and the concentrations of benzophenone (BP) and monomer, and the effect of the concentration and molecular weight of PEO_a on the polymerization of VAc, are discussed; the relationship R_p ∝ [PEO_a-11000]^0.33 [VAc]^0.28 [BP]^0.47 using benzene as a solvent was derived. The dependence of the thermal properties of PEO-b-PVAc on the length of the PVAc block is described. It turned out that the PEO and PVAc blocks are compatible.     

人类一条新的类蛋白质二硫键异构酶cDNA的克隆和表达

利用SMART技术构建了人胎脑cDNA文库，通过大规模测序筛选出一条1645bp的人类cDNA。此cDNA含有一个888bp的开放阅读框（ORF），编码一个296个氨基酸的蛋白质，预测分子量34．0KD。与目前数据库中序列比较，该cDNA编码的蛋白质与蛋白质二硫键异构酶的同源性达36％，命名为类蛋白质二硫键异构酶（PDI－L）基因，多组织Northern blot分析显示PDI－L cDNA在心、脑、肝肾等组织中均有表达，该cDNA的读框片段正确插入到改造后的pBV220表达载体中，获得了预期的表达蛋白。     

The dependence of nerve regeneration through muscle grafts in the rat on the availability and orientation of basement membrane

Summary Nerve regeneration through grafts of basement membrane matrix, prepared by freezing of autogenous muscle followed by thawing in distilled water, was investigated in Sprague-Dawley rats. Electrophysiological evidence of recovery in distal nerve was observed at 51 days after implantation of treated grafts whose basement membrane tubes were coaxial with the proximal and distal ends of the transected sciatic nerve. This correlated with histological findings of well-developed myelinated nerve fibres within both grafts and distal nerve. However, whereas normal axon numbers were achieved in the grafts by 3 months, the regenerating nerve in these muscle grafts took 6 months to 1 year to recover normal axon diameter and myelination. Recovery was delayed through grafts whose basement membrane tubes were at right angles to the nerve fibres and through grafts of untreated muscle coaxially aligned. It is concluded that successful repopulation of the distal stump and functional recovery can follow nerve regeneration through treated muscle autografts. The rate of regeneration is dependent on the availability of empty basement membrane tubes. If these are unavailable or inappropriately orientated, regeneration can still occur but is significantly delayed.     

A transformation procedure for Botryotinia squamosa

Summary The onion leaf blight fungus, Botrytis squamosa, was transformed to hygromycin B resistance using a plasmid (pDH25) containing a bacterial gene for hygromycin phosphotransferase (hph) fused to promoter elements from Aspergillus. Southern hybridization of transformants indicated that single or multiple copies of the vector were integrated into heterologous regions of the B. squamosa genome. Free plasmid was found in undigested preparations of transformant DNA, but was not detected after 3–5 passages of selective transfer. Most transformants were mitotically stable in both selective and non-selective growth; however, both genetic rearrangements and loss of integrated DNA occurred during vegetative growth.     

Histiocytosis X. S-100 protein, peanut agglutinin, and transmission electron microscopy study

Twenty-seven cases of histiocytosis X (HX) for which paraffin blocks were available were studied with the use of S-100 protein immunohistochemistry, peanut agglutinin affinity histochemistry, and transmission electron microscopy. The results show that these techniques did enable identification of Langerhans'-type histiocytes in 88.5%, 75%, and 47.4% of cases, respectively. All techniques were proved to be of some diagnostic value for HX, but none was able to confirm the diagnosis in all instances and none could foretell the prognosis of the patients. This study shows that besides the Langerhans' cells, the indeterminate cells of the skin and the interdigitating dendritic reticulum cells of the lymph node may also be involved in this process. Moreover, some multinucleate giant cells and foamy cells may be derived from Langerhans' and related cells.     

北京市三所高校大学生SARS流行期的心理状态现况调查

目的 :了解SARS流行时期大学生在封闭式管理下的心理状况。方法 :采用症状自评量表、ZUNG氏焦虑自评量表、ZUNG氏抑郁自评量表和一般状况调查表 ,以分层整群抽样的方法 ,对北京市三所重点大学 62 80名在校本科大学生和研究生进行了心理状况自评问卷调查。结果 :症状自评量表的因子阳性检出率为 7 3 % ,各因子得分均明显低于既往北京市大学生调查结果 ;除恐怖因子和精神病性因子外 ,各因子得分均低于或接近国内常模 (t=2 17-5 3 65 ,P <0 0 5 )。焦虑症状阳性检出率为 9 5 % ,抑郁症状阳性检出率为 2 9 6%。结论 :北京市SARS流行期间大学生存在焦虑、抑郁症状 ;采取了有效的传染病防治和健康教育等措施后大学生群体的心理健康状况良好。