简介:Novelsulfur-containingcompounds(3a–3c,4a–4c)wereobtainedinethanolwith1,3-diphenyl-2-propanoneasthestartingmaterial.Theadvantagesofthisprocedureweremildreactionconditions,simpleprotocol,andhighyields.ThestructuresoftheproductswerecharacterizedbyIR,1HNMR,MSandelementaryanalysis.Thecrystalofthenewcompound4abelongstomonoclinic,spacegroupC2witha=18.727(3),b=6.5179(9),c=13.7576(18),b=131.0610(10)°,V=1266.2(3)A3,Z=2,Dc=2.136g/cm3,μ=1.078mm-1,F(000)=843,R=0.0490andwR=0.1247for3211observedreflectionwithI>2δ(I).X-rayanalysisrevealsthatthemoleculeisnotsymmetrical,themolecularstructureisstabilizedbyweakp–pstackinginteractions,andnoclassicalhydrogenbondscanbeobserved.
简介:目的:分析3种流感病毒(H1N1、H3N2、乙型)的流行病学特点及其感染患者的血常规结果,为类流感患者的临床预防、诊断和治疗提供新的思路和依据。方法:统计2010年1月至2012年12月在本院发热门诊就诊,且经病毒核酸检测证实的421例H1N1、H3N2及乙型流感患者,同时采集其手指末梢血进行血常规检查,用SPSS19.0统计软件对其流感病毒流行趋势进行分析。结果:H1N1、H3N2、乙型流感病毒的暴发没有特定规律,但有阶段性。421例类流感患者的血常规分析中,白细胞总数正常者311例(73.87%)、增高者86例(20.43%);中性粒细胞百分比增高者313例(74.35%);淋巴细胞百分比降低者274例(20.43%)。3种流感患者的血常规结果经t检验后提示,H1N1与H3N2流感患者的白细胞总数、中性粒细胞百分比及淋巴细胞百分比间均无统计学差异(P〉0.05),而H1N1及H3N2与乙型流感患者间的白细胞总数、中性粒细胞百分比及淋巴细胞百分比都存在统计学差异(P〈0.01)。结论:H1N1、H3N2、乙型流感病毒的爆发无规律.但可在一定阶段流行.因此对类流感患者的监测要坚持全年并严密防范。流感病毒阳性患者主要以白细胞总数正常、中性粒细胞百分比增高及淋巴细胞百分比降低为主,但H1N1、H3N2流感患者比乙型流感患者的白细胞总数、中性粒细胞百分比要高.而其淋巴细胞百分比则相对乙型流感患者要低。故对于血常规检测结果与流感病毒感染的通常血象变化不符.但临床高度怀疑为流感病毒感染者.在抗菌治疗效果不明显时,应考虑作咽、鼻拭子病毒核酸检测.以进一步确诊。
简介:PolycrystallinesamplesofLa12x(Sr12yAgy)xMnO3(y=0.0,0.2,0.4,0.6,1.0)werepreparedbythesolid-statereactionmethod.ThetemperaturestabilityofmagnetoresistanceandmagnetoresistanceenhancementinLa1-x(Sr1-yAgy)xMnO3systemwithbothunivalentandbivalentelementsdopedatAsiteandwithunchangedvalueofMn3+/Mn4+ratiowereexploredthroughthemeasurementsofX-raydiffractionpatterns,magnetiza-tion-temperature(M-T)curves,resistivity-temperature(q-T)curvesandmagnetoresistance-temperature(MR-T)curves.Theresultsareasfollows:therearetwopeaksintheq-TcurvesofthesampleswithAgdoping,oneiscausedbyresistancechangeduringtheparamagnetism-ferromagnetismtransition,andtheotherisfromboundary-dependentscatteringofconductionelectronsontheboundariesofgrains.ThepeakvalueofMRincreaseswithincreasingAgdopingcontent,anditincreasesfrom8.2%fory=0.2to29.6%fory=1.0underthemagneticfieldofB=0.8T;MRremainsaconstantof12%inthetemperaturerangeof218-168Kforthesamplewithy=1.0,andthetemperaturestabilityofMRisinfavorofthepracticalapplicationofMR.