亮氨酸脑啡肽的电子结构及构效关系研究

对亮氨酸脑啡肽进行了量子化学(INDO)计算,研究其电子结构特征,讨论其活性部位、作用机理及构效关系。同吗啡和R31833进行了活性部位的电子结构与空间结构比较,推断它们的活性药效结构具有共同特点,与阿片受体相互作用时作用方式相同,作用部位有对应关系,因而具有相同的药理性质。     

化湿利水泄浊法对自发性高血压大鼠主动脉血管结构的影响

为观察化湿利水泄浊法(DTM)对自发性高血压大鼠(SHR)主动脉血管结构的影响。27只12周龄SHR，随机分为模型组(B)、化湿利水泄浊组(C)、依那普利组(D)，另选同周龄大鼠9只作为正常对照组(A)，灌胃给药8周。测量清醒状态下尾动脉收缩压，及血浆内皮素(ET)、降钙基因相关肽(CGRP)。血管壁厚度／管外径(WT／LD)、管壁面积／管面积(MA／WA）、管腔面积／管面积(LA／WA）。主动脉血管平滑肌细胞增殖核抗原(PCNA)的表达。结果：与A组比较，收缩压B组明显升高，C组明显下降；B组ET浓度升高，C组下降；B组主动脉超微结构见中膜纤维化改变，细胞间隙增宽，平滑肌细胞排列紊乱等改变；C、D组动脉超微结构改变较轻；B组平滑肌细胞PCNA表达明显增强，C、D组降低。提示化湿利水泄浊法能部分逆转SHR主动脉的超微结构改变，抑制平滑肌细胞增殖可能是其发挥作用的机制之一。     

行列资料诊断试验预告值和准确度的一次性标化研究

本文建立了行列资料诊断试验预告值和准确度的一次性标化方法，省去了标化过程理论样本Ｎｔ的设定和求有关理论值的计算过程，导出行列资料中标准化Ⅰ级阳性预告值和标准化Ⅱ级阳性预告值、标准化Ⅰ级阴性预告值和标准化Ⅱ级阴性预告值、标准化可疑预告值和标准化准确度的一次性标化公式。分析了标化与非标化预告值的关系及转化规律。     

(2S,4S,5S)-3,4-二甲基-5-苯基-2-对二甲氨基苯基恶唑烷晶体结构的研究

目的：测定（２Ｓ，４Ｓ，５Ｓ）－３，４－二甲基－５－苯基－２－对二甲氨基苯基恶唑烷的光谱和晶体结构。方法：Ｘ－射线晶体衍射法。结果：晶胞参数为ａ＝６０７８３（４），ｂ＝１９００４２（３），ｃ＝１４３４２１（２），Ｖ＝１６２４３３，Ｚ＝４，Ｆｗ＝２６８２８，计算得，Ｄｃ＝１０３２ｇ／ｃｍ３，结构偏离因子为Ｒ＝００５８，Ｒｗ＝００５３。结论：标题化合物属于正交晶系，空间群为Ｐ２１２１２１。     

Influence of elevated pH levels on structural and functional characteristics of the human zona pellucida: Functional morphological aspects

Purpose A total of 86 fresh and salt-stored immature human oocytes derived from postmortem ovarian tissue were used for this study.Methods Oocytes were randomly incubated either in synthetic human tubal fluid medium (untreated zonae) or in a chemically defined medium (treated zonae).Results Sperm binding experiments using hemizona assay conditions exhibited a 10-fold increased binding of sperm to treated compared to untreated oocytes (272.7±43 versus 24.3±15 sperm bound, respectively; P<0.0001). pH recordings during incubation showed elevated pH levels of 8.1 compared to pH 7.2 among treated and untreated zonae, respectively. Ultrastructural examination showed a spongy appearance of the surface of treated zonae, whereas untreated zonae appeared compact with smooth surface.Conclusions The marked increase in sperm binding among treated zonae, together with the ultrastructural findings, suggest that the altered zona surface enhances sperm binding. The physiological maturational process of the zona pellucida might be manipulated in vitro, thus increasing sperm binding to the zona.Presented at the IXth World Congress on In Vitro Fertilization and Alternate Assisted Reproduction, April 3–7, 1995. Vienna, Austria.     

精子染色质结构分析的临床意义

目的探讨女方不明原因流产和不明原因不孕与其配偶精子染色质性状之间的关系;方法通过精子染色质结构分析(SCSA)对22例不明原因流产和36例不明原因不孕妇女配偶精子,以及20例正常对照者精子进行DNA完整性检测,并比较它们之间的差异;结果对照组与不明原因流产组以及不孕组之间精子DNA完整性存在差异,且差异具有统计学意义(P<0．05),而不明原因流产组与不孕组之间精子DNA完整性比较无明显差异(P>0．05);结论精子染色质结构分析有可能作为不明原因流产和不孕的辅助诊断方法在临床应用。     

关于新型农村合作医疗的支持结构及均势模式探讨

新型农村合作医疗可持续发展需要有完备的社会支持系统,除了要有来自政府的正式支持,如政府责任、完善的组织管理及合理的政策方案外,其他非正式支持同样对新型农村合作医疗的发展有着至关重要的影响。通过研究新型农村合作医疗的社会支持系统结构,探讨社会因素对新型农村合作医疗的双向作用,提出新型农村合作医疗发展的社会支持模式,为提高新型农村合作医疗社会支持程度提供科学依据。     

Metabolic and hormonal blood flow modeling in patients with coronary heart disease: In vitro and clinical study

The blood flow pattern investigations are of great importance in coronary blood flow destabilization pathogenesis understanding, and consequently in acute coronary event (ACE) risk stratification in patients with coronary heart disease. The aim of the study was to research the principal hormonal and metabolic blood flow regulative aspects and its structure in patients with ischemic heart disease and the contribution to cumulative ACE risk.A total of 182 patients with stable angina pectoris were included in the prospective study (2000–2006). Complex clinical examination, biochemical tests and blood tests were performed. Whole-blood (WB) viscosity, erythrocyte aggregation and deformation ability, WB suspension stability, and initial erythrocytes disaggregation parameter were studied. Dynamic characteristics of blood flow were obtained in the experiment.Received results allow marking the principle components of blood flow pattern with proven high prognostic value of ACE in patients with ischemic heart disease. ACE risk stratification program was developed.     

The Relationship of pK a and Acute Skin Irritation in Man

The relationship between pK _a and skin irritation in man is studied for a homologous series of benzoic acid derivatives, which permeate through human skin at comparable rates (15–88 µg/cm²/hr). Skin irritation and pK _a are correlated for pK _a 4. Laser Doppler velocimetric assessment of skin blood flow, color meter readings, erythema, edema, and the primary irritation index are all linearly correlated and related to pK _a, erythema at 24 hr appears to be the most sensitive parameter to variation in pK _a when pK _a 4.     

蛋白质中两种Strand-Loop-Strand模体的判断

目的:蛋白质的结构决定其功能,为了解蛋白质功能,需要了解蛋白质结构。随着基因测序的发展,大量蛋白质一级结构被测出,但直接从蛋白质的序列出发来预测高级结构,仍很困难,尤其是三级结构的预测。然而由超二级结构获得的结构信息可用于三级结构的预测,对蛋白质三维结构及功能预测有重大意义。方法:由一级结构出发,考虑氨基酸序列信息以及氨基酸的亲疏水性,利用Fisher判别法区分两种Strand-Loop-Strand超二级结构模体。结果:采用7交叉检验,Loop长为2～8时,最后平均结果为Q=71.8%,Q_L=68.2%,Q_H=73.4%,MCC=0.39。如Loop长度相差不大时,预测结果更好,如选取Loop长为2、3、4的序列,7交叉检验结果为Q=75.2%,Q_L=69.4%,Q_H=77.7%,MCC=0.45。结论:以氨基酸信息为特征指标,利用Fisher判别法能较好地区分两种Strand-Loop-Strand超二级结构模体。