Molecular characterization of the genomic S RNA segment from lymphocytic choriomeningitis virus

We have used cDNA clones derived from the genomic S RNA segment of lymphocytic choriomeningitis virus (LCMV), Armstrong strain, as hybridization probes to monitor virus gene expression during acute infections. Our results with strand-specific probes confirm the ambisense character of the LCMV S RNA segment and document the presence of both genomic sense and genomic complementary sense RNA species over the time course of infection. We have used nucleotide sequence information to predict primary amino acid sequences for the major viral structural proteins, nucleoprotein (NP) and glycoprotein (GP-C). Antibodies raised against synthetic peptides derived from these predicted protein sequences have indicated that the gene order for the S segment is 3' NP----5' GP-C and provided direct demonstration that the GP-1 portion of the GP-C precursor is encoded nearest the 5' end of the S segment. Comparison of the predicted amino acid sequences for NP and GP-C between the Armstrong CA-1371 strain and the WE strain shows over 90% amino acid identity. This suggests that significant differences described for the pathogenic potential of the Arm and WE strains in C3H mice reside in one or a very few critical amino acid changes.     

动脉粥样硬化的分子成像:血管细胞黏附分子-1为靶向的磁性微泡和对比增强超声诊断效能

目的评价经血管细胞黏附分子-1(VCAM-1)(CD106)靶向的微泡,在磁性导引系统帮助下,能否提高对比增强分子超声(US)对主动脉粥样硬化的检出效能。材料与方     

现代医学模式对完善医疗保险制度的挑战与启示

分析了我国基本医疗保险制度存在的主要问题和面临的挑战,提_出在现代医学模式的指导下,通过建立激励自我保健的基本医疗保险制度、促进医疗保险转变为健康保险、将预防保健和心理服务纳入医保基金支出重点以及完善社区卫生服务等措施,推动我国医疗保险制度日益完善。     

一株产高质量浓度酒精酵母的间歇发酵动力学初步研究

对一株产高质量浓度酒精的酿酒酵母的间歇发酵动力学进行了初步研究.分别对基质、产物和菌体对时间的变化,所得回归方程显示,3个状态参量与时间呈对数关系;而后采用比生长速率、某一时段的菌体浓度、某一时段的葡萄糖质量浓度、某一时段的酒精质量浓度来描述整个发酵过程中菌体、基质和产物之间的关系,通过二次曲面回归得到了间歇发酵动力学数学模型,与传统的Monod模型和Logistic模型相比,该模型对试验数据拟合和预测性能较好.最后,用Simplex优化方法对间歇发酵动力学进行动态模拟,得到很好的拟合结果.将得到的模型参数用于预测初糖质量浓度为24.7g/dL的间歇发酵,预测结果也较好.因此,该模型可用来预测高初糖质量浓度下间歇发酵过程.     

以人性化设计为导向的家庭医疗器械设计

本文分析了现代医疗器械的发展走向,以及产生的相应使用者发生变化的问题.归结出家庭医疗器械必须以人性化设计为导向.解释了人性化设计的概念,仔细探讨了如何在家庭医疗器械设计中体现以人为本的思想,并总结归纳出家庭医疗器械的人性化设计方法.     

高免疫球蛋白E综合征：2例报道及文献回顾

高免疫球蛋白E综合征(H IES)是一种罕见的免疫缺陷性疾病,表现为血清IgE水平升高、皮肤湿疹、反复皮肤感染和特征性的肌肉骨骼表现。作者报道2例在本院就诊的患者并回顾当前文献。患者1是一18个月大的非裔美国男孩,伴有复发性葡萄球菌冷脓肿、肺炎和菌血症。该患者皮肤严重湿疹     

头皮原发性皮肤神经节细胞瘤

神经节细胞瘤是一种神经内分泌肿瘤，其发生与自主神经系统的交感或副交感神经节有关。罕见发生于膀胱、前列腺和子宫。本文作者报道1例发生于儿童头皮的原发性皮肤神经节细胞瘤。对此肿瘤进行了组织学、免疫组化和超微结构研究。该病例可能代表神经嵴细胞向鳃弓发育过程中的一种异常迁移。此外，研究结果还强调在胚胎发育过程中神经嵴和鳃弓／裂之间有复杂的相互作用。     

HIV infection in haemophilia--a European cohort

Ten haemophilia centres in northern Europe have pooled data on 202 haemophilic children who were infected with HIV between 1979 and 1986. All cases were under 16 years of age on 1 July 1985. The age at infection ranged from 1-15 years. Thirty seven cases (18%) had progressed to AIDS by 1 July 1991 and 15 of these have died. Persistent generalised lymphadenopathy has been noted in 102 patients of whom 18 (17%) have developed AIDS. Twenty three of the remaining patients (23%) have not. CD4+ T cell counts have fallen steadily. Of 36 patients who have had shingles since seroconversion, 19 (53%) had counts below 0.2 x 10(9)/l. Thirty five out of 145 patients without shingles (24%) had similar values. The mean IgA concentration in patients with CD4+ T cell counts above 0.5 x 10(9)/l was 2.38 g/l, between 0.2 and 0.5 was 3.07 g/l, and in those with CD4+ T cell counts below 0.2 x 10(9)/l the mean IgA concentration was 4.58 g/l. Treatment patterns have altered between 1989 and 1991, with increased use of zidovudine in patients without AIDS and a marked increase in primary prophylaxis against pneumocystis pneumonia. This has been associated with a decline in the incidence of pneumocystis as an indicator disease in new AIDS cases from 56% in 1989 to 20% in 1991. These observations indicate that persistent generalised lymphadenopathy does not worsen the outlook, but shingles does. Rising IgA concentrations are markers for disease progression. Modern prophylactic regimens are delaying the onset of indicator disease, but CD4 values continue to fall steadily.     

The use of prostaglandins for the therapeutic termination of pregnancy

The investigational use of (PGs) prostaglandins to induce termination of early pregnancy has developed rapidly in the U.S. PGF2alpha administered by intraamniotic instillation has demonstrated a high efficacy rate ( 95%) with a low incidence of side effects in over 1600 midtrimester terminations. Acceptable abortifacient efficacy with minimal side effects was also shown in 500 documented cases investigating the action of PGF2alpha instilled extraamniotically in gestational ages ranging from 8-16 weeks. Expanded studies using PGE2 vaginal suppositories inserted at 4-8 hour intervals has combined ease of administration with a high degree of effectiveness. Initial clinical studies with an analog of PGE2((15S)-15-methyl-PGE2methyl ester) have documented increased potency in regard to uterine stimulation and duration of activity, with induction of abortion occurring after a single intramuscular injection.