由CD4098组成的晶闸管三相过零触发器

本文针对晶闸管移相触发的一些弱点，提出了过零触发的观点。应用CD4098单稳态触发器组成了三相过零触发电路，达到了较为理想的调功效果。该触发器电路简单．调试方便，具有一定的实用价值。     

CD15s和E-cadherin表达与肝细胞癌侵袭转移相关性研究

目的：探讨CD15s和E-钙黏蛋白（E-cadherin）在肝细胞癌组织中的表达及其与肿瘤侵袭转移和患者预后的关系。方法：应用免疫组织化学方法,检测120例肝细胞癌组织中CD15s和E-cadherin蛋白表达,结合随访资料进行分析。结果：CD15s和E-cadherin在肝细胞癌中阳性表达率分别为39.2%和44.2%。CD15s阳性表达的肝细胞癌转移率高（P〈0.05）,分化程度及患者5年生存率低（P〈0.05） E-cadherin阳性表达的肝细胞癌转移率低（P〈0.05）,分化程度及患者5年生存率高（P〈0.05）。CD15s表达与E-cadherin表达呈显著负相关（P〈0.05）。结论：CD15s和E-cadherin表达与肝细胞癌转移和患者生存期密切相关,联合检测CD15s和E-cadherin蛋白表达可作为判断肝细胞癌预后有价值的参考指标。     

急性脑梗塞患者粘附分子CD_(18)、CD_(54)表达的研究

[目的]探讨粘附分子CD18、CD54粘附功能及其表达变化与急性脑梗塞(ACI)关系.[方法]用流式细胞术检测88例ACI患者白细胞粘附分子CD18、CD54含量与脑梗塞发生时程、部位、面积及治疗前后表达。并与30例正常人作对照.[结果]ACI患者CD18、CD54表达明显增高,与正常对照组比较差异显著(P<0.05),与梗塞面积、部位关系不大;ACI患者CD18、CD54表达在7d内均可有较高水平的表达,治疗10d后表达降低,治疗前后比较CD18、CD54差异有意义(P<0.05).[结论]CD18、CD54参与脑梗塞发生发展病理过程.可做为诊断脑梗塞、评估预后的一项辅助指标.     

Anti-CD69 monoclonal antibody treatment inhibits airway inflammation in a mouse model of asthma

Objective: Airway inflammation and airway hyper-responsiveness (AHR) are principle pathological manifestations of asthma. Cluster of differentiation 69 (CD69) is a well-known co-stimulatory factor associated with the activation, proliferation as well as apoptosis of immune cells. This study aims to examine the effect of anti-CD69 monoclonal antibody (mAb) on the pathophysiology of a mouse model of asthma. Methods: A murine model of ovalbumin (OVA)-induced allergic airway inflammation was used in this study. Briefly, mice were injected with 20 μg chicken OVA intraperitoneally on Days 0 and 14, followed by aerosol provocation with 1% (0.01 g/ml) OVA on Days 24, 25, and 26. Anti-CD69 mAb or isotype IgG was injected intraperitoneally after OVA challenge; dexamethasone (DXM) was administrated either before or after OVA challenge. AHR, mucus production, and eosinophil infiltration in the peribronchial area were examined. The levels of granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-5 (IL-5) in bronchoalveolar lavage fluid (BALF) were also assayed as indices of airway inflammation on Day 28 following OVA injection. Results: Pretreatment with DXM together with anti-CD69 mAb treatment after OVA provocation completely inhibited AHR, eosinophil infiltration and mucus overproduction, and significantly reduced BALF IL-5. However, treatment with DXM alone after OVA challenge only partially inhibited AHR, eosinophil infiltration and mucus overproduction, and did not diminish BALF IL-5. Treatment with either DXM or anti-CD69 mAb did not alter the concentration of BALF GM-CSF. Conclusions: Anti-CD69 mAb treatment inhibits established airway inflammation as effectively as DXM pretreatment. This study provides a potential alternative therapeutic opportunity for the clinical management of asthma and its exacerbation.     

近生理浓度的脲对核黄素与牛血清蛋白结合作用的影响

用CD光谱和荧光光谱研究了近生理浓度的脲存在和不存在两种情况下核黄素和牛血清蛋白之间的相互作用.一定浓度的核黄素结合在牛血清蛋白上可以引起BSA分子结构伸展,二级结构和三级结构减少.近生理浓度的脲可以诱导核黄素变性的牛血清蛋白二级结构和三级结构部分恢复.脲存在时,核黄素对牛血清蛋白的熄灭常数（Kq）以及供体和受体之间的距离（r）增大.相反地,结合常数（Ka）和结合位点数（n）减小.脲存在下,核黄素和牛血清蛋白的结合作用是一个熄灭作用增强,结合作用减弱的过程.人体内血脲的正常范围为0.0025–0.0075M,脲浓度达到0.01 M时,由于核黄素和HAS分子的弱结合作用导致血浆中核黄素缺乏,一些病人可能会因为核黄素缺乏,结合着药物的生物大分子不能被有效地转移进细胞内,不能被某些药物有效地治疗.     

外周血CD83+细胞检测在慢性病毒性肝炎中的意义

为了解树突状细胞（DC）在慢性病毒性肝炎中的变化及其临床应用价值，采用流式细胞仪检测技术检测了65例慢性肝炎患者外周血中CD83＋细胞的水平。结果显示：慢性病毒性肝炎患者外周血中CD83＋细胞的水平与病情、短期内患者的预后显著相关。说明DC在慢性病毒性肝炎的发生中发挥重要作用，而CD83＋细胞的检测有助疾病的鉴别诊断和短期内预后的判断，有很好的临床应用价值。     

基于单片机"看门狗"抗干扰技术的探讨

在实验中开发出来的各种控制小系统经常会出现运行不稳定、死机或停不了机即程序跑飞等现象,这是由于恶劣的工业现场环境如大功率感性负载的干扰所至。基于单片机的“看门狗”技术能解决这个问题。本文将通过应用实例,分别介绍用软件和硬件来实现“看门狗”技术。为技术人员在单片机开发过程中出现的干扰现象提供一个有效的解决思路。     

Performance analysis of an iSCSI-based unified storage network

INTRODUCTIONNASisatermusedtorefertostorageele mentsthatconnecttoanetworkandprovidefileaccessservicestocomputersystems.Incommonusage ,aNASsystemisaspecial purposedevicethatisdesignedtoservefilestoclientsoveraLAN .Therearemanybenefitsinthearchitec ture:heterogeneousfilesharing ;internalre sourcepooling;exploitationoftheexistingin frastructure;simplicityofimplementation ;con nectivity;improvedmanageability;reductionoftotalcostofownership ;andsoon .Butinprac tice,therearestillmanydrawbacks…     

平均累积报道时差统计法——MEDLINE CD-ROM报道时差实例分析

“平均累积报道时差统计法”用于数据库报道时差的统计 ,可快捷精确地统计较长年限的累积时差 ,消除了手工抽样统计由于统计年限较短带来的统计误差。统计结果可直接用于相同专业的不同种类检索工具之间平均报道时差的评价。公式 2。表 3。参考文献 3。