简介：本文报道了Ｃ６Ｈ１２Ｏ６（ＮＨ４）２ＳＯ４Ｃ２Ｈ５ＯＨＨ２Ｏ（Ｃ２Ｈ５ＯＨ／Ｈ２Ｏ＝０．９０）体系在３５℃时体系溶解度和饱和溶液的折光指数，并绘出了体系相应的溶度图和饱和溶液的折光指数曲线图。结果表明：所研究的体系为四元体系Ｃ６Ｈ１２Ｏ６（ＮＨ４）２ＳＯ４Ｃ２Ｈ５ＯＨＨ２Ｏ中的一部分。当溶液中肌醇饱和时，溶度曲线落在约５０％的等醇水比面上。当（ＮＨ４）２ＳＯ４在溶液中达到饱和时，出现共饱点。其组成为（ＮＨ４）２ＳＯ４：２１０％，Ｃ６Ｈ１２Ｏ６：２．０８％，Ｃ２Ｈ５ＯＨ：４４７５％。同时出现分层，在富醇相随着乙醇浓度的增加，出现肌醇与硫酸铵共饱线。在富水相硫酸铵饱和溶度曲线落在约５％乙醇的等醇水比面上，折光指数曲线由三支组成，其中两条分别与Ｃ６Ｈ１２Ｏ６·Ｈ２Ｏ和（ＮＨ４）２ＳＯ４相对应，另外一条线与（ＮＨ４）２ＳＯ４和Ｃ６Ｈ１２Ｏ６·Ｈ２Ｏ的共饱线相对应

简介：Lactivicin,anovelinhibitorofbacterialcellwallsynthesis,wasisolatedfromtheculturefil-tratesofmicroorganismYK-258andYK-422.Itexhibitsbiologicalactivitiessimilartothoseoftheβ-lactamantibiotics,althoughitdoesnothaveaβ-lactamringinitsmolecule.Sincethediscoveryoflactivicin,hundredsofitsderivativeshavebeensynthesized.Most

简介：目的:对在LPS、TNF-α刺激下,人β-防御素-2基因5'-端转录调控机制进行初步分析.方法:将HBD-2基因5'-端上游序列连接入无启动子的pEGFP-1质粒,构建了系列5'端缺失的pEGFP-1/HBD-2报告质粒.pEGFP-1/HBD-2质粒转染细胞后给予LPS、TNF-α刺激,用RT-PCR检测pEGFP的mRNA浓度.结果:显示HBD-2基因上游-241段有较强的启动子活性;LPS、TNF-α刺激后,即使上游序列缩短至-241位点时,报告基因pEGFP的mRNA表达量仍明显增高.说明HBD-2基因上游-241区域含有LPS、TNF-α刺激后激活的转录因子作用位点.计算机分析表明-232/-222区域有一同源性极高的NF-kB结合元件,提示NF-kB结合元件可能调控HBD-2的增强表达.

简介：本文设计合成了１０个未见文献报道的２—对甲氧基苯亚甲基５取代胺甲基环戊酮衍生物，均经红外光谱、核磁共振谱及元素分析，证实其化学结构。采用角叉菜胶诱发的大鼠足爪肿胀模型进行抗炎活性的初步筛选。在化学合成中还证实：Ｍａｎｎｉｃｈ碱的胺交换反应是消除加成反应。更多还原

简介：Methetraxate(MTX),aclassicaldihydrofolatereductaseinhibitor,wasasuccessfulclinicalantitumoragent,havingpotentinhibitoryactivitiestoseveralkindsoftumors.Unfortunately,thecancercellkswereeasiertoproduceresistancetoMTXwhichendedinthefailureofchemotherapy.Inordertoovercometheresistanceoftumorcells,anewkindofdihydrofolatereductaseinhibitorscallednonclassicalantifolateincludingtriazines,pyrimidinesandquinazolinesweredesignedandsynthesized.Becauseofthedifferentantitumormechanismsbetweenthetwokindsofcompunds,thecancercellsresistanttoMTXmaystillbesensitivetothenonclassicalantifolate.Accordingtothistheory,somenonclassicalantifolate2,4-diamino-5-methyl-6-(substitutedbenzylamino)quinazolineswiththegeneralstructureshowninFIg.1weresynthesizedandtheirantitumoractivitiesweredeterminedinthisthesis.

简介：ＳｔｕｄｉｅｓｏｎｔｈｅＳｙｎｔｈｅｓｉｓ，ｔｈｅ２Ｄａｎｄ３ＤＱＳＡＲＡｂｏｕｔＬｉｐｏｐｈｉｌｉｃＡｎｔｉｆｏｌａｔｅ２，４Ｄｉａｍｉｎｏ５ｍｅｔｈｙｌ６（ＳｕｂｓｔｉｔｕｔｅｄＢｅｎｚｙｌａｍｉｎｏ）ＱｕｉｎａｚｏｌｉｎｅＣｏｍｐ...

简介：Objective:Theaiminthisstudywastoidentifytheallelicfrequenciesofthechemokine(SDF1-3'A)andchemokinereceptor(CCR5△32,CCR5m303andCCR2-64I)genesresistanttoHIV-1infectionand/ordiseaseprogressioninindigenousChinesepopulations.Methods:ByusingQIAampDNABloodMiniKit,thegenomicDNAsampleswerepurifiedfromwholeperipheralbloodofhealthyindividuals(n=2067)fromHan,Uygur,MongolianandTibetanethnicgroups,aswellasHanpatientsincludingHIV-1carriers(n=330),patientswithothersexuallytransmitteddiseases(STDs,n=259)andintravenousdrugusers(IVDUs,n=125).TheallelicpolymorphismswereidentifiedbymeansofPCRorPCR-RFLPanalyses.ThesequencesofrandomlyselectedamplifiedPCRproductswerefurtherconfirmedbydirectDNAsequencing.Results:Themutantfrequencieswereidentifiedtobe0%-3.48%forCCR5△32,0%forCCR5m303,19.15%-28.79%forCCR2-64and19.10%-28.73%forSDF1-3'Aalleles,respectively,inChinesehealthyindividualsfromfourethnicgroups.Ourfindingsindicatedtheallelicfrequenciesvaryamongthedifferentethnicgroups.Furthermore,theHIV-1carriers,STDcasesandIVDUs(allofHanethnicity)werefoundtohavetheallelicfrequenciesof0%-0.19%(CCR5A32),0%(CCR5m303),19.31%-20.45%(CCR2-64)and25.61%-26.83%(SDF1-3'A)withminorvariationsintheirfrequenciesbetweenthepatientsandhealthyHangroups.TherewasnoCCR5-m303mutationfoundinanysubjectinthisstudy.Conclusion:TheexaminedsubjectsoffourChineseethnicoriginsshowedlowerfrequenciesofCCR5A32andCCR5m303alleles,buthigherfrequenciesofmutantCCR264IandSDF1-3'Aallelescomparedtothoseidentifiedinnorthern-EuropeanandAmericanCaucasians.ThesignificanceofthedifferentfrequenciesandpolymorphismsoftheaboveallelesinChinesepopulationsneedstobefurtherexaminedinHIV-1/AIDSdiseases.

简介：以对羟基苯甲酸乙酯为原料，经肼解、环化合成５（４羟基苯基）１，３，４二唑２硫酮，继而经Ｍａｎｎｉｃｈ反应合成了四种新曼尼希碱，其结构经红外光谱、核磁共振和元素分析证实。初步抑菌活性试验表明，显示弱的抑菌活性。

简介：1病例摘要患儿，女，4岁，因反复发热5个月，头晕，头痛3个月并加重呕吐1周入院，患儿于入院前5个月无明显诱因出现发热，体温最高为39-40℃,每日3-4次，伴咳嗽，不剧，喉中有痰声。血常规：WBC33.3×10^9·L^-1,N0.8-0.9，红细胞沉降率（ESR）90mm·h^-1，X线照片示“肺炎”，

简介：摘要目的本研究旨在探讨αSMA,Bcl-2,Ki67,CAM5/6在成釉细胞癌中的表达和意义；材料和方法利用免疫组织化学方法研究αSMA,Bcl-2,Ki67,CAM5/6四种因子在别在6例成秞细胞瘤和1例成釉细胞癌中的表达；结果αSMA,Bcl-2,Ki67,CAM5/6在成釉细胞癌中的表达水平明显高于在成釉细胞瘤的表达。结论我们推断αSMA,Bcl-2,Ki67,CAM5/6可望成有判断成釉细胞癌预后的指标。

简介：目的探讨常规体表静息心电图Tv1(Tv2)＞Tv5(Tv6)在冠心病诊断中的价值.方法110例住院行冠脉造影的患者,按造影结果分为冠心病组和非冠心病组,两组均多次记录常规十二导心电图,比较Tv1(Tv2)＞Tv5(Tv6)综合征在两组间检出率的差异,并与心电图ST段压低指标相比,分析Tv1(Tv2)＞Tv5(Tv6)综合征诊断冠心病的价值.结果Tv1(Tv2)＞Tv5(Tv6)综合征的检出率在冠心病组和非冠心病组有显著差异.Tv1(Tv2)＞Tv5(Tv6)诊断冠心病的敏感度为70.3%、特异度为66.6%,与ST段压低相比敏感性较高,但后者特异度高于Tv1(Tv2)＞Tv5(Tv6).结论Tv1(Tv2)＞Tv5(Tv6)综合征对诊断冠心病有一定价值,但特异性不高,应结合临床及其他心电图指标综合进行判断.

简介：多多喝水夏季心烦、脾胃停滞，容易造成胃肠不消化、胀气、食欲不振等，从现在起应避免肥腻食物，改由新鲜、清淡饮食取代。乳制食物、过多盐分的食物和油炸食物，或是进补的羊肉炉、麻油鸡、烧酒鸡等，不适合在夏天食用。对老人及小孩，不易消化的糯米也要适可而止。

简介：宝宝饮食太重要，科学喂养要记牢。”哪些食物该吃，哪些食物不宜多吃，对宝宝的健康成长十分重要。

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简介：通过[3^++2]环加成反应立体选择性合成了顺，反－1，2－二甲基－3－，5－二苯基－4－吡唑烷羧酸，并用NOESY谱和X－射线衍射确定了其1，2－反式，2，3－反式，3，4－顺式，4，5－反式的立体化学特征。

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简介：2006年6月25日消息。委内瑞拉5个州最近暴发登革热，已经造成至少3人死亡。

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简介：Objective:AllelicpolymorphismsofCCR5△32、CCR2b-64I,CX3CR1-249I280MandSDF1-3’AassociatedwithHIV-1infectionanddiseaseprogressionwereinvestigatedinindigenousUygurpopulationsfromtheXinjiangUygurAutonomousRegionofChina.Mithods:Thestudypopulationcomprised316healthyUygursubjectswithanagerangeof1-80yearsold,fromwhomwholeperipheralbloodsampleswerecollectedandnonewereHIV-1seropositive.GenomicDNAsampleswerepurifiedusingaQiagenBloodKit.GenotypingoftheaforementionedfouralleleswasperformedusingPCRorPCR/RFLPassay,andfurtherconfirmedbydirectDNAsequencing.Results:TheallelicfrequenciesinChineseUygurpopulationwereasfollows:3.48%forCCR5△32;19.45%forCCR2b-64I;13.8%forCX3CRI-249I280Mhaplotype,and20.41%forSDFI-3’A.MutantalleledistributionsamongUygurpopulationswereinaccordancewiththeHardy-Weinbergequilibrium.NostatisticaldifferencewasfoundbetweenthefrequencyofthethreeHIVcoreceptorsandtheirrespectiveligandgenes.Conclusion:ThefrequencyofSDF1-3’AandCX3CR1-249I280MhaplotypemorecloselymatchedthehanChinese.ThefequencyofCCR5△32inUygurpopulationswasbetweenCaucasianandHanfrequencies,themorecloselymatchingthefrequencyinMedi-Asiapeople.NogeneticlinkagebetweenanytwoofthethreeHIVcoreceptorgeneswasfound,butobviousgeneticlinkagesexistedbetweenCX3CR1-249IandCX3CR1-280M,withevenhigherlinkagedegreesthanCaucasianpeople.