简介：ITS2是真核生物rRNA基因的重要组成部分，在rRNA基因加工成熟过程中起到至关重要的作用．ITS2的高级结构相对保守，对其序列进化表现一定程度的限制作用．ITS2保守的结构域和二级结构为广范围遗传距离排序提供了重要的技术保障．正因为如此，ITS2在高级阶元系统发育关系分析中展示出诱人的前景．

简介：目的：研究蜀葵与药蜀葵特征DNA序列的差异，为鉴定维吾尔药材蜀葵及药蜀葵提供依据。方法：采用试剂盒法提取蜀葵及药蜀葵基因组DNA，PCR扩增ITS2片段，双向测序，应用Mega6．0软件分析序列，计算种内及种间遗传距离，构建NJ鉴别树。结果：蜀葵ITS2序列长度为233bp，与药蜀葵231—232bp存在差异；蜀葵种内最大K2P遗传距离为0．004，药蜀葵种内K2P遗传距离为0，蜀葵与药蜀葵种间平均K2P遗传距离为0．0732；NJ树结果表明蜀葵与药蜀葵均单独聚为一支。结论：ITS2序列可用于维吾尔药材蜀葵真伪鉴定的DNA条形码，为保障临床正确用药提供了新的方法。

简介：目的：应用ITS2序列对朱砂根及其混伪品进行鉴定研究，为中药临床准确用药、市场规范化管理等提供依据和保障。方法：对朱砂根及其混伪品进行DNA提取、PCR扩增ITS2序列、双向测序，对序列进行比对、计算遗传距离。结果：朱砂根ITS2序列长度为217bp，种内有10个变异位点，有9种单倍型，平均G＋C含量为59.1%，除变种红凉伞外，朱砂根与其各混伪品的种间最小遗传距离均大于朱砂根种内最大遗传距离，所以利用ITS2序列可以鉴别朱砂根及其混伪品。结论：实验结果表明ITS2序列可以鉴别朱砂根及其混伪品，但对于其与变种的关系需进一步研究。

简介：摘要车前子是中药材中的常用药，但在自然界中存在大车前、长叶车前等混伪品，影响了车前子的用药安全性。本文就以ITS2与psdA-trnH序列对细小种子类药材车前子的鉴定能力进行相应的探索研究，并将两者的鉴定结果进行对比分析，以期为更好的对车前子的品质及混伪品进行鉴定提供相应的理论支持。

简介：目的：采用ITS2条形码对维吾尔药材药西瓜及其误用品栝楼、罗汉果进行分子鉴定，以确保药材质量及临床疗效。方法：提取维吾尔药材药西瓜及其误用品栝楼、罗汉果的DNA，并对药材进行PCR扩增其ITS2（internaltranscribedspacer2）并双向测序，经CodonCodeAlingnerV3．0对其测序峰图进行校对拼接后，用MEGA6．05软件计算种内种间遗传距离K2P（kimura．2-parameter），并构建邻接系统聚类树NJ（neighbor-joingtree，NJTree）。结果：提取维吾尔药材药西瓜及误用品栝楼、罗汉果基因组DNA后，经检测具降解现象，但仍可通过PCR扩增获得三者的ITS2序列；药西瓜与误用品之间的K2P遗传距离远大于药西瓜种内遗传距离；NJ系统聚类树结果表明能将药西瓜与其误用品区分开来，单独聚为一类。结论：ITS2条形码可准确鉴别维吾尔药材药西瓜及其误用品，为药西瓜的质量和临床用药安全提供了鉴定依据。

简介：HyoscyamiSemen,thematuredriedseedofHyoscyamusnigerL.,haslongbeenusedasatraditionalChinesemedicinetotreathumandiseases.HyoscyamiSemenisfoundinlocalmarketsinChina.Inmarkets,sellersandbuyerscommonlyinadvertentlymixtheseedsofH.nigerwiththeseedsofrelatedspeciessuchasHygrophilasalicifolia(Vahl)Nees,AstragaluscomplanatusR.Br.,CuscutaaustralisR.Br.,CuscutachinensisLam.,andImpatiensbalsaminaL.becauseoftheirsimilarmorphologiesorsimilarnames.Thus,developingareliablemethodfordiscriminatingH.nigerseedsfromitsadulterantsisnecessarytoreduceconfusionandensurethesafeuseofHyoscyamiSemen.Thepresentstudywasdesignedtoevaluatetheefficiencyofhigh-resolutionmeltinganalysiscombinedwithDNAbarcoding(Bar-HRM)withinternaltranscribedspacer2todiscriminateH.niger.OurresultsshowthatBar-HRMsuccessfullyidentifiedtheadulterantsanddetectedtheproportionofH.nigerDNAextractwithinanadmixture.Inparticular,HRMdetectedH.nigerDNAextractinA.complanatusDNAextractatconcentrationsaslowas1%.Inconclusion,theBar-HRMmethoddevelopedinthepresentstudyforauthenticatingH.nigerisrapidandcost-effective.ItcanbeusedinthefuturetoguaranteethepurityofHyoscyamiSemenfortheclinicaluse.

简介：Inthiswork,boththethermalexpansionandelectricalconductivityofnanocrystallineLa2Mo2O9werestudied.ThenanocrystallinepowderofLa2Mo2O9wasobtainedbysol-gelmethod,andwiththehelpofSHP(superhighpressure)upto4.5×104atmat700℃forashorttime,andthenanocrystallinepowderwasdensifiedwithoutobviousparticlesizegrowth.TheelectricalconductivityofnanocrystallineLa2Mo2O9wasoneorderofmagnitudelowerthanthatofthemicrocrystallinesampleatthesametemperature.Owingtothephasetransition,themicrocrystallineLa2Mo2O9hasanabruptincreaseofthermalexpansionwithapeakvalueof48×10-6K-1at556℃.Forthenanocrystallinematerial,thepeakvalueincreasesto112×10-6K-1at520℃.Ontheotherhand,above600℃thesignificantgrowthofparticlesizeofthenanocrystallineLa2Mo2O9wasobserved,accompanyingbyatremendousincreaseofthermalexpansionwithapeakvalueofthirdhigherthanthatofLa2Mo2O9.

简介：HL-2Aisadivertortokamakwithnoncircularplasmacross-section,itcanoperateinsingle-nullordouble-nullplasmadischarges.Thetoroidalandpoloidalcoils,vacuumvesselandsupportingstructureofHL-2AcomefromtheformerASDEX,Germany.

简介：AbstractSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to evolve, generating new variants that pose a threat to global health; therefore, it is imperative to obtain safe and broad-spectrum antivirals against SARS-CoV-2 and its variants. To this end, we screened compounds for their ability to inhibit viral entry, which is a critical step in virus infection. Twenty compounds that have been previously reported to inhibit SARS-CoV-2 replication were tested by using pseudoviruses containing the spike protein from the original strain (SARS-CoV-2-WH01). The cytotoxicity of these compounds was determined. Furthermore, we identified six compounds with strong antagonistic activity against the WH01 pseudovirus, and low cytotoxicity was identified. These compounds were then evaluated for their efficacy against pseudoviruses expressing the spike protein from B.1.617.2 (Delta) and B.1.1.529 (Omicron), the two most prevalent circulating strains. These assays demonstrated that two phenothiazine compounds, trifluoperazine 2HCl and thioridazine HCl, inhibit the infection of Delta and Omicron pseudoviruses. Finally, we discovered that these two compounds were highly effective against authentic SARS-CoV-2 viruses, including the WH01, Delta, and Omicron strains. Our study identified potential broad-spectrum SARS-CoV-2 inhibitors and provided insights into the development of novel therapeutics.

简介：TiO2nanometerthinfilmswithphotocatalyticantibacterialactivitywerepreparedbythesol-gelmethodonfusedquartzandsodalimeglassprecoatedwithaSiO2layer.ThethinfilmswerecharacterizedbyX-rayphotoelectronspectroscopy(XPS),scanningelectronmicroscopy(SEM),andX-raydiffraction(XRD).TheresultsshowthatsodiumandcalciumdiffusionintonascentTiO2filmiseffectivelyretardedbytheSiO2layerpre-coatedonthesodalimeglass.Theantibacterialactivityofthefilmswasdetermined.ThecrystallineofTiO2nano-meterthinfilmhasimportanteffectsontheantibacterialactivityofthefilm.

简介：Theprinciplesandfeaturesofmicrowavesintering,theapplicationinrefractoriesandsynthesismethodsofZrB2arereviewed.ThesynthesisresultsofZrB2bythermitdeoxidatemethodshowthatproductionpriceofZrB2canbeeffectivelyloweredthroughmicrowavesynthesis.ItwillexpandtheapplicationofZrB2inrefractories.

简介：弄平的粒子水动力学(SPH)是一个Lagrangian无网孔的粒子方法。然而，它内核近似的低精确性当粒子是分布式的时在边界附近混乱或定位是以它的宽应用程序的方法站的一个障碍。采用泰勒系列扩大方法并且解决不可分的方程矩阵，第二个顺序核近似方法能被获得，也就是K2_SPH，它在这份报纸被讨论。这个方法类似于有限粒子方法。与核近似的改进，一些数字技术应该为边界的不同类型被采用，例如一条免费表面边界和稳固的边界，它是为水波浪模拟的K2_SPH的二种关键数字技术。这份报纸给一些涉及由使用K2_SPH承受波浪和sloshing坦克问题的二维的水波浪模拟的数字结果。从模拟结果的比较，K2_SPH方法比标准SPH更可靠。

简介：Themonitoringoftheradiationenvironmentofearth’sspacehasimportantsignificancefordevelopingspacescienceandapplicationtechniques.Themeasurementofspaceradiationincludesmainlytwoaspects:(1)measurementofenergyspectraandfluxofprotonandelectron,(2)theidentificationofparticlespecieslighter

简介：the basic aim of the new foreign policy was to preserveChina ‘s national security.This was characterized by the creation of a bufferzone between China and the imperialist countries such as the US,　　The policy of a united front for peace brought about obvious changes in NewChina ‘s diplomacy -the signing of a cease-fire agreement in Korea in The summerof 1953,and was a sign of the ultimateformation of New China’s diplomacy.

简介：Polyfluoroalkylsubstituted2-hydroxyethylacrylate6wassynthesizedinsixstepsusingglycerolasastartingmaterial.Apreliminaryinvestigationhasbeentakenonthesynthesisandcharacterizationofcopolymersof6and2-hydroxyethylmethacrylate.

简介：ＥＸＰＲＥＳＳＩＯＮＯＦｃｅｒｂＢ２ＡＮＤＰＣＮＡＩＮＣＥＲＶＩＣＡＬＡＤＥＮＯＣＡＲＣＩＮＯＭＡＡＮＤＩＴＳＳＩＧＮＩＦＩＣＡＴＩＯＮＨｕａｎｇＹｏｎｇ黄勇ＣａｉＳｈｕｍｏ蔡树模ＹｕＳｈａｏｙｉｎ俞绍音ＳｈｉＤａｒｅｎ施达仁ＣａｎｃｅｒＨｏｓｐ...

简介：ThispaperpresentsthelimitingexpressionforthegencalizedinverseAT.S(2)anditscorresgondingprojectorsSincecomononimnortorsinverses,suchasandAT.S(2)etcareallgeneralizedineeAT.S(2)Infact,wegiveaunifiedlimitingformulaofcomputinesuchimporiantgeneralinedinversesanditscorrespondingproiectors,BasedonthisweestalishandimbedlingmethodfirecompotingthegeneralizedinverseAT.S(2)Theresultsextendearlierworkbyvariousauthors.

简介：瞄准：检验矩阵metalloproteinase-2(MMP-2)在胃的癌症纸巾并且到的表示与淋巴节点评估它的关系微转移。方法：作者从30学习了850淋巴结resected与淋巴腺切除术经历了胃切除术用的有胃的癌的病人颠倒抄写聚合酶链反应(RT-PCR)试金除了他染色。肿瘤纸巾的MMP-2表示被免疫检测组织化学的技术(EliVision加)。结果：MMP-2表示在21是积极的(70%)在9的盒子和negative(30%)盒子。没有重要关联在象年龄，性，肿瘤地点，肿瘤直径，Lauren分类和淋巴的侵略那样的MMP-2表示和另外的变量之间被发现。相反，MMP-2表示与肿瘤渗入的深度显著地相关(P=0.022)，淋巴节点转移(P=0.030)并且肿瘤区别(P=0.043)。淋巴节点微转移在77被检测(12.5%)14的淋巴节点(46.7%)胃的癌病人。MMP-2表示在12是积极的(85.7%)有淋巴节点的14个病人微转移，并且在9(56.3%)没有淋巴节点的16个病人微转移(P=0.118)。结论：我们的结果证明那MMP-2表情与肿瘤侵略，肿瘤区别和淋巴节点转移有重要关联。MMP-2表示可以是一个重要生物特征和胃的癌的重要预示的参数。我们也断定MMP-2可以参予淋巴节点的发展胃的癌的微转移。进一步的调查被需要得出一个结论。

简介：

简介：AIM:ToinvestigatetheeffectofhepatitisBvirus(HBV)XgeneonapoptosisandexpressionsofapoptosisfactorsinXgene-transfectedHepG2cells.METHODS:TheHBVXgeneeukaryonexpressionvectorpcDNVA3-XwastransientlytransfectedintoHepG2cellsbylipid-mediatransfection.UntransfectedHepG2andHepG2transfectedwithpcDNA3wereusedascontrols.ExpressionofHBxinHepG2wasidentifiedbyPT-PCR.MTTandTUNELwereemployedtomeasureproliferationandapoptosisofcellsin.threegroups.Semi-quantifiedRT-PCRwasusedtoevaluatetheexpressionlevelsofFas/FasL,Bax/Bcl-xL,andc-mycineachgroup.RESULTS:HBVXgenewastransfectedintoHepG2cellssuccessfully.RT-PCRshowedthatHBxwasonlyexpressedinHepG2/pcDNA3-Xcells,butnotexpressedinHepG2andHepG2/pcDNA3cells.AnalyzedbyMTT,cellproliferationcapacitywasobviouslylowerinHepG2/pcDNA3-Xcells(0.08910±0.003164)thaninHepG2(0.14410±0.004927)andHepG2/pcDNA3cells(0.12150±0.007159)(P＜0.05andP＜0.01).AnalyzedbyTUNEL,cellapoptosiswasmuchmoreinHepG2/pcDNA3-Xcells(980/2000)thanHepG2(420/2000),HepG2/pcDNA3cells(520/2000)(P＜0.05andP＜0.01).Evaluatedbysemi-quantifiedRT-PCR,theexpressionlevelofFas/FasLwassignificantlyhigherinHepG2cellstransfectedwithHBxthaninHepG2andHepG2/pcDNA3cells(P＜0.05andP＜0.01).Bax/Bcl-xLexpressionlevelwasalsoelevatedinHepG2/pcDNA3-Xcells(P＜0.05andP＜0.01).Expressionofc-mycwasmarkedlyhigherinHepG2/pcDNA3-XcellsthaninHepG2andHepG2/pcDNA3cells(P＜0.05andP＜0.01).CONCLUSION:HBVXgenecanimpaircellproliferationcapacity,improvecellapoptosis,andupregulateexpressionofapoptosisfactors.TheinterventionofHBVXgeneontheexpressionofapoptosisfactorsmaybeapossiblemechanismresponsibleforthechangeincellapoptosisandproliferation.