简介:Thebindingofnuclearproteinspreparedfrommouseerythroidtissueindifferentdevelopmentalstagestothe5'-flankingregulatoryelementsofhumanβ-globingene,twonegativecontrolregions(NCR1,-610to-490bp;NCR2,-338,to-233bp),wasidentified.TwostagespecificproteinfactorscorrespondingtoembryonicandfetalstageswerefoundtobecapableofbindingtoNCR2.Thesedataprovidedevidencethatthecisactingelementsofthe5'-flankingregionmightbeinvolvedinthedevelopmentalcontrolofβ-globingeneandNCR2mightberesponsibleinartforthesilenceofβ-glolbingeneintheembryonicandfetalstages.
简介:AfterriverclosinginNovember2002,thephaseIIIproject(rightbankpowerstation)willproceedinfullswing.Foraseriesofconstructionandinstallationworksfocusingonriverclosingfrompreparationtoimplementation,safetymonitoringandrightbankpowerhousecivilconstruction,invitation
简介:AgraphpropertyisasetofgraphssuchthatifthesetcontainssomegraphGthenitalsocontainseachisomorphiccopyofG(withthesamevertexset).AgraphpropoertyPonnverticesissaidtobeelusive,ifeverydecisiontreealgorithmrecognizingPmustexaminealln(n-1)/2parisofverticesintheworstcase.Karpconjecturedthateverynontrivialmonotonegraphpropertyiselusive,Inthispaper,thisconjectureisprovedforsomecases,Especially,itisshownthatiftheabstractsimplicialcomplexofanontrivialmonotonegraphpropertyPhasdimensionnotexceeding5,thenPiselusive.
简介:济钢对闲置的M84100/5M轧辊磨床的改造,既满足了宽厚板生产的需要,还节约了资金,同时也为轧辊磨床的改造积累了经验。
简介:Thesupramolecularinclusioncompoundofβ-cyclodextrin(β-CD,host)with(η5-cyclopentadienyl)tricarbonylmanganese[MnCp(CO)3,guest]wasobtainedinacrystallinestate.Thehost-guestcompoundisthermallystableanddonotliberatetheguestonheatingat100$invacuum.Itwascharacteriedbyelementalanalysis,1HNMR,differentialscanningthermal(DSC)analysisandTLC.ContinueousvariationplotbyNMRmethodshowsthatβ-CDformed1:1inclusioncompoundwithMnCp(CO)3.Onthebasisof1HNMRspectraandthemodelbuildingwithCoreyPaulingKoltum(CPK)models,themostprobableinclusionmodeisproposed.
简介:1998年5月,当惊艳世界的第一台iMac发布时.它一下吸引了全世界的眼球。一体化的创意加上“草莓蓝”的色彩,突破了个人电脑以往的呆板.成为后来IT业竞相模仿的标准。时间不觉又过去六年.iMac早已更新换代。圆头圆脑的CRTiMacG3已为LCD台灯iMacG4所替代。六年里苹果共卖出750万台iMac.成为世界上最畅销的单一品牌一体化电脑系列。近几个月新一代iMacG5的传言甚嚣尘上.苹果公司却因为IBMG5芯片生产遇到难题而延迟了发表的时间。正是千呼万唤始出来.8月31日开幕的巴黎《苹果世界展》上,iMacG5终于亮出了庐山真面目。