宫腔超声造影对因宫腔因素致不孕症诊断的探讨

目的:探讨宫腔超声造影(SHG)对因宫腔因素致不孕症诊断的应用价值。方法:42例不孕症患者经阴道超声检查疑有宫腔病变,随后行SHG检查,结果与宫腔镜检查和病理诊断相对照,评估SHG对宫腔因素致不孕症诊断的价值。结果:通过与宫腔镜检查和病理检查结果相比,经阴道超声检查对疾病的诊断符合率为40.48%,SHG对疾病的诊断符合率为83.33%,二者疾病诊断符合率相比差异具有显著统计学意义(P<0.01)。结论:宫腔超声造影术方便、经济、无创,准确性高,对疑有宫腔因素致不孕的患者可常规进行检查,在不孕症的病人诊治中有一定的临床价值。     

交叉口信号配时的优化设计

文章先回顾了信号交叉口通行能力的研究方法,简要分析并评述了几个国内外常用的信号交叉口通行能力研究方法.采用相位分离法,提出了一种比较简单的信号灯控制算法.最后结合算例,与实地设置对比来说明本算法的合理性、实用性、优越性.     

图的交叉数综述

综述了图的交叉数研究诞生60余年来,国内外的研究进展和若干结果.包括了以下4个方面:一些具有特殊结构图类的交叉数;交叉数的下界;与一些参数相关的交叉数性质;以及其他类型的交叉数.     

宫腔镜检查诊断宫腔内疾患120例临床分析

为探讨官腔镜检查对官腔内病变诊断的准确性，对120例可疑官腔内病变的患者的宫腔镜检查结果进行了回顾性分析，认为官腔镜检查是某些官腔内病变诊断的重要手段，具有直观、方便、准确性高的优点，是官腔内疾患诊断的金标准．     

创伤后急性胆囊炎

本文指出:“创伤后的急性胆囊炎为急性结石性胆囊炎,是创伤后的一种严重并发症”。“一旦确诊应尽快手术治疗”。本组5例经胆囊切除后均痊愈。     

Production of translocation by crossing two different alien substitutions in wheat

The translocation frequency up to 3.7% has been obtained by crossing aTriticum-Thinopyrum substitution with aTriticum-Haynaldia substitution. The pattern of translocations includes not only wheat-alien Robertson translocations but also inserting translocations involvingThinopyrum chromatin andHaynaldia chromatin. The result indicates that it may be a new method of producing translocations to make two different wheat-alien substitution cross with each other.     

Photoreceptor-specific degeneration caused by tunicamycin

The antibiotic tunicamycin inhibits the biosynthesis of N-acetylglucosaminylpyrophosphoryl polyisoprenol, a key intermediate in the formation of the asparagine-linked oligosaccharides of glycoproteins. The effects of tunicamycin have been studied in various biological systems, primarily with the aim of elucidating the role of the carbohydrate moieties in the cellular function of glycoproteins. Rhodopsin, the visual pigment of retinal rod photoreceptor cells, is a membrane glycoprotein which consists of a single polypeptide chain (opsin) to which a chromophoric prosthetic group (II-cis-retinaldehyde) and two asparagine-linked oligosaccharide chains are covalently attached. The glycosylation of opsin can be blocked with tunicamycin in vitro in conditions where polypeptide synthesis is only slightly decreased. We have reported that tunicamycin can disrupt the normal assembly of rod outer segment membranes in vitro without significantly inhibiting the biosynthesis or intracellular transport of opsin. Here we report that intraocular injection of tunicamycin produces a photoreceptor-specific degeneration characterized by progressive shortening of rod outer segment, decreased membrane assembly, and eventual photoreceptor cell death.     

铁路道口过车检测装置设计

分析了铁路道口管理的需要，根据实际工作环境，采用铁路专用车轮传感器检测通过列车，并用无线传输技术，降低了施工难度，实现了道口的自动管理．当列车通过时，用语音提示过往行人和车辆注意安全，提示道口工作人员注意坚守岗位，避免了人工了望可能带来的失误．     

S3与Wn的笛卡尔积交叉数

本文先构造S3×Wn的一种好画法,由这种好画法计算出Cr(S3×Wn)≦2[(n-1)2/4] [n/2] 5,然后利用数学归纳法证明Cr(S3×Wn)≧2[(n-1)2/4] [n/2] 5,从而确定了S3与Wn的笛卡尔积交叉数即Cr(S3×Wn)=2[(n-1)2/4] [n/2] 5.