Chapter3-StruggleforExistence
...hplantsareentitledtohold,iftheexistenceofanywell-markedvarietiesbeadmitted.Butthemereexistenceofindividualvariabilityandofsomefewwell-markedvarieties,thoughnecessaryasthefoundationforthework,helpsusbutlittleinunderstandinghowspeciesariseinnature.Howhaveallthoseexquisiteadaptationsofonepartoftheorgan...
医源资料库;医源图书馆;教材类;The Origin of SpeciesTanningisassociatedwithoptimalvitaminDstatus(serum25-hydroxyvitaminDconcentration)andhigherbonemineraldensity
...ySchoolofMedicine,M-1013,715AlbanyStreet,Boston,MA02118.E-mail:mfholick{at}bu.edu.ABSTRACTBackground:VitaminDismadeintheskinonexposuretosolarradiation,anditisnecessarytooptimalskeletalhealth.SubjectswhouseatanningbedthatemitsultravioletBradiation(290315nm)arelikelytohavehigher25-hydroxyvitamin...
医源资料库;在线期刊;美国临床营养学杂志;2004年80卷第6期NeuroprotectionbyHypoxicPreconditioningInvolvesOxidativeStress-MediatedExpressionofHypoxia-InducibleFactorandErythropoietin
...poxicpreconditioningisanendogenousprotectionagainstsubsequentlethalhypoxia,butthemechanisminvolvedisnotunderstood.Hypoxiaisfollowedbyreactiveoxygenspecies(ROS)productionandinduceshypoxia-induciblefactor(HIF)anditsdownstreamfactorerythropoietin(Epo),whichisassociatedwithneuroprotection.Wehypothesized...
医源资料库;在线期刊;中风学杂志;2005年第36卷第6期非放射性标记物BrdU研究进展
...结合部位。此外,变性和单抗孵育须严格衔接,如变性后BU20a单抗孵育延误1小时,BrdU阳性细胞核标记数便从6.6%降至1.4%[7],说明影响LI的因素复杂,加单抗前仔细研究变性技术及干扰因素,从而获得BrdU标记应有的高LI是必要的。...
合作平台;医学论文;临床医学与专科论文;检验医学Longitudinalchangesintheaccuracyofreportedenergyintakeingirls1015yofage
...s,BostonUniversity,635CommonwealthAvenue,Boston,MA02215.E-mail:lbandini{at}bu.edu.ABSTRACTBackground:Dietaryrecordsareoftenusedtoestimateindividualenergyneedsandpopulationenergyrequirements.However,significantunderreportingoftotalenergyintake(EI)hasbeenfoundwhenEIiscomparedwithtotalenergyexpenditure...
医源资料库;在线期刊;美国临床营养学杂志;2003年78卷第3期Monovisionslowsjuvenilemyopiaprogressionunilaterally
...hestudyandpossiblerisksandbenefits.Participantswerefreetowithdrawatanytime,butanysuggestionthatperformanceatschoolwascompromisedoranyreductioninbestcorrectedacuityineithereye,orthedevelopmentofmorethan1.00Dofanisometropiacomparedtobaseline,resultedinautomaticparticipantwithdrawal.Amaximumdurationfor...
医源资料库;在线期刊;英国眼科学杂志;2005年第89卷第9期CirculatingCD31+/AnnexinV+ApoptoticMicroparticlesCorrelateWithCoronaryEndothelialFunctioninPatientsWithCoronaryArteryDisease
...oasendothelialdysfunction.1ThelatterisnotonlyaprerequisiteofatherosclerosisbutlargelyinfluencestheoutcomeofpatientsatcardiovascularriskorwithCAD.2-4Onthemolecularandcellularlevel,endothelialdysfunctioniscausedbyreducednitricoxidebioavailability,whichis,inturn,regulatedbygenes,suchasthenitricoxidesyn...
医源资料库;在线期刊;动脉硬化血栓血管生物学杂志;2006年第26卷第1期Changesinregionalfatredistributionandtheeffectsofestrogenduringspontaneousweightgaininwomenwithanorexianervosa
...ubinsteinFoundation.3AddressreprintrequeststoSGrinspoon,NeuroendocrineUnit,Bulfinch457b,MassachusettsGeneralHospital,Boston,MA02114.E-mail:sgrinspoon{at}partners.org.ABSTRACTBackground:AnorexianervosaisadiseaseofsevereacquiredundernutritionwithahighandincreasingprevalenceamongyoungwomenintheUnitedSt...
医源资料库;在线期刊;美国临床营养学杂志;2001年73卷第5期Adetailedphenotypicstudyof“conedystrophywithsupernormalrodERG“
...esponses.Electrophysiologicaldatawereconsistentwithapost-phototransduction,butpre-innernuclearlayer,siteofdysfunction.Whilethedefinitivediagnosiscanonlybemadewithelectrophysiologicaltesting,severalcharacteristicsthatmayincreasesuspicionofthisdiagnosisarepresented.Abbreviations:AF,autofluorescence;BE...
医源资料库;在线期刊;英国眼科学杂志;2005年第89卷第3期NovelApproachforAssessingPerformanceofPCRCyclersUsedforDiagnosticTesting
...ionofcyclermodels(5,10,12,14,17).Othersdeterminedtheamplificationefficiencybutnotthephysicalpropertiesofthermocyclers(7,16).Accordingtoaninterlaboratorystudy,inappropriatecyclersthatproducedthemostnonrepeatabledatawereolderthan4years,hadnoheatedlid,andwererununderblockcontrol(16).Thephysicalfunction...
医源资料库;在线期刊;微生物临床杂志;2005年第43卷第6期