简介:Objective:Todetectsuperoxideanion(O-2)signalsintheheart,liver,lungandkidneytissuesafterburns.Methods:Twenty-fourmaleratswererandomizedinto4groups.Theratsofexperimentalgroupswereimmersedin100℃waterfor15secondsand25%third-degreeburnwascreated.Thoracotomyorlaparotomywasperformedat5,10,15,20and30minutesafterburn,andspecimensoftheheart,lung,liverkidneywereobtainedforburnedrats.Thespecimenswerethenpreservedinliquidnitrogenforcryo-preservationanddetectedimmediatelyusingEPR.Results:ThesignalsofsuperoxideOradicalappearedintheheart,lung,liverandkidneyspecimens10-15minutesafterburn.Conclusions:Thereisadirectevidenceofoxygenfreeradicals(OFRs)injurytovisceraofburnedratsbetween10-15minutesafterburn.
简介:微结构和电子横梁的机械描述焊接了伪造Ti-6Al-4V的关节被调查。Microhardness测试显示熔化地区(FZ)的坚硬比影响热的地区(HAZ)和贱金属的高。张力的结果证明焊接关节的机械性质以静态的力量与贱金属的那些是可比较的并且根据在微观结构和焊接关节的机械性质之间的关系。焊接的最终的张力的强度等于时漏关节的,它显示横向的FZ的纵的FZ和那些的机械性质是一样。基础材料,关节,和焊接标本的Macromechanical行为和macrofracture和microfracture被观察。在标本破裂现象的三种类型之中的比较揭示下列特殊差别:(1)破裂模式,(2)在中央区域的酒窝模式的显微图,并且(3)在中央区域和转变区域的酒窝的尺寸。
简介:Asasuccessiveworkofourpreviouspaper,^1theelectrontransfermatrixelement(Vrp)intheoxidationofthesimplifiedmodelmoleculeofα-aminocarbon-centeredradicalbyO2hasbeeninvestigatedwithabinitiocalculationatthelevelofUHF/6-31G**.Basedontheoptimizedgeometriesofthereactgantandtheion-paircomplexobtainedpreviously,thereactionheatandtheiunerreorganizationenergyhavebeenobtainedbyconstructingthepotentialenergycurvesofreactantandproductstatesconsideringthesolventeffectwiththeconductor-likescreeningmodel(COSMO).ThesolventreorganizationenergyhasbeenestimatedusingLippert-Matagarelationship.ThecalculatedresultsshowthatthevalueofVrpisseveraltimeslargerthanthatofRT,whichmeansthatthemodelreactionisanadiabaticone.Theoreticalinvestigationindicatesthatthesolventeffectonthedirectelectrontransfer(ET)processofoxidationofα-aminocarbon-centeredradicalbyoxygenisremarkable.
简介:Thisisafollowofpreviousworkentitled"OneElectronAtominSpecialRelativitywithdeSitterSpaceTimeSymmetry"[Commun.Theor.Phys.57(2012)930].Inthispaper,weconsiderthehigherordercalculationsandcontributionsinthepreviousframeworktosolveoneelectronatomsindeSitterinvariantrelativisticquantummechanics.Thenext-to-leading-ordercalculationsin1/R2-expansionsshowthatthefine-structureconstantαisvariantwithcosmologictimegoingbyinthedeSitterinvariantspecialrelativisticquantummechanicswithstandardFRWcosmologicmodel.
简介:Forelectronicmicroscopicobservation,wefoundSSV-transformedNIH3T3cellsweredifferentfromnon-transformedcells.InSSV-transformedNIH3T3cellsnucleicytoplasmaratiowasincreasedandincytoplasmatheribosomes(polyribosomeswereattachedtotheswollenroughendoplasmicreticulum.Itwaslikelythatribosomeswerelinedtogetherfunctionallyandstructionallytoproducespecificprotein(PDGF-likeprotein).
简介:ObjectivesTocomparethedifferentpatternsofcoronaryarterycalcification(CAC)inacuteandchroniccoronarysyndromesutilizingelectronbeamcomputedtomography.BackgroundPathologic,angiographic,andintracoronaryultrasoundstudiesrevealedsharpdifferencesintheplaquemorphologybetweenpatientswithacuteversuschroniccoronarysyndromes.Whethertherearedifferentpatternsofcoronaryarterycalcificationinpatientswithstableanginapectoris(SAP)andinthosewithunstableanginapectoris(UAP)oracutemyocardialinfarction(AMI),however,remainsunclear.MethodsTwohundredandsixty-fourpatients,including67withSAP,94withUAPand103withAMIwerestudiedwithelectronbeamcomputedtomographyforanalysisofcoronaryarterycalcificationandwithselectivecoronaryangiographyfordeterminationofatheroscleroticlesions.CACprevalenceandcalciumscorewerecomparedamongthreegroups,andrelationofCACtotheseverityofatheroscleroticdiseaseintheSAPandUAP
简介:Changesoftheaveragebrightnessandnon-uniformityofdarkoutputimages,andqualityofpicturescapturedundernaturallightingforthecolorCMOSdigitalimagesensorsirradiatedatdifferentelectrondoseshavebeenstudiedincomparisontothosefromtheγ-irradiatedsensors.Fortheelectron-irradiatedsensors,thenon-uniformityincreasesobviouslyandasmallbrightregiononthedarkimageappearsatthedoseof0.4kGy.Theaveragebrightnessincreasesat0.4kGy,increasessharplyat0.5kGy.Thepictureisveryblurryonlyat0.6kGy,showingthesensorundergoessevereperformancedegradation.ElectronradiationdamageismuchmoreseverethanγradiationdamagefortheCMOSimagesensors.Apossibleexplanationispresentedinthispaper.
简介:Whistler-modechoruswavesareregardedasanimportantaccelerationmechanismcontributingtotheformationofrelativisticandultra-relativisticelectronsintheJovianradiationbelts.QuantitativedeterminationofthechoruswavedrivenelectronscatteringeffectintheJovianmagnetosphererequiresdetailedinformationofbothambientmagneticfieldandplasmadensityandwavespectralproperty,whichhowevercannotbealwaysreadilyacquiredfromobservationsofexistedmissionstoJupiter.WethereforeperformacomprehensiveanalysisofthesensitivityofchorusinducedelectronscatteringratestoambientmagnetosphericandwaveparametersintheJovianradiationbeltstoelaboratetowhichextentthediffusioncoefficientsdependonanumberofkeyinputparameters.Itisfoundthatquasi-linearelectronscatteringratesbychoruscanbestronglyaffectedbytheambientmagneticfieldintensity,thewavelatitudinalcoverage,andthepeakfrequencyandbandwidthofthewavespectraldistributionintheJovianmagnetosphere,whiletheyonlyrelyslightlyonthebackgroundplasmadensityprofileandthepeakwavenormalangle,especiallywhenthewaveemissionsareconfinedatlowerlatitudes.Giventhechoruswaveamplitude,chorusinducedelectronscatteringratesstronglydependonJovianL-shelltoexhibitatendencyapproximatelyproportionaltoLJ3.OurcomprehensiveanalysisexplicitlydemonstratestheimportanceofreliableinformationofboththeambientmagnetosphericstateandwavedistributionpropertytounderstandingthedynamicelectronevolutionintheJovianradiationbeltsandthereforehasimplicationsforfuturemissionplanningtoexploretheextremeparticleradiationenvironmentofJupiteranditssatellites.
简介:ThelaserphotolysisofN-diisopropylphosphoryltryptophyltyrosinedipeptidemethylester(N-DiPP-TrpH-TyrOH)hasbeencarriedoututilizingaKrF(248nm)laser.ThedirectintramolecularETbetweenTrpH+residueandTyrOHresiduewasdetectedfirstandtheETbetweenTrpandTyrOHbecameslow.Itwassuggestedthatphosphorylgroupstabilizeneighbourradicalofaromaticringbyhyperconjugation.IncombinationwithcomputermodelingweobtainedthekineticparametersoftheETandprovedthatphosphorylgroupstookpartintheprocessofET.Theresultsshouldbesignificantforbiologicalsystemsinceeverybiologicalprocessinvolvesthephosphorylationornonphosphorylation.
简介:Objective:Tofurtherinvestigatetheosteogenicpotentialofrabbitmarrowstromalstemcellsculturedinvitro.Methods:Rabbitmarrowstromalstemcellswereisolatedbydensitygradientcentrifugationmethodandamplifiedintheflasks,usingtheosteogenicinducingconditions(OGC)astheculturemedia.Theosteogenicpotentialofmarrowstromalstemcellswereinvestigatedbymeansofbone-seekingfluorescenc(tetracycline)labeling,AlizarinredS(ARS)staining,Alcianblue-Siriusred(AS)staining,andscanningelectronmicroscope.Results:Afterbeingpassaged,themarrowstromalstemcellsincreasedinnumber,becameconfluentandformedmulti-layerstructure.Thestromalstemcellsexcretedinnumerabletinygranules,heapinguponthecellbodyandmerginggraduallyintofoggysubstances.Thesefoggysubstanceskeptonenlargingandformedround,oval,orflake-likenodules.Thesenodulesrevealedbrightgoldenyellowfluorescenceunderfluorescencemicroscopewhenlabeledwithtetracycline.HistochemicalstudywithspecificnewbonestainingwithARSrevealedpositivecalciumreaction,bothdenotingthattheywerenewlyformedbonetissues.AftertheywerestainedwithAS,collagenandacidmucopolysaccharidewereshown.Underscanningelectronmicroscope,threetypesofcellswithdifferentconfigurationswerefound.Theywereglobularcells,spindle-shapedcellsandpolygonalorpolygonalcells.Granuleswereexcretedfromthecellsandheapeduponthecellbody.Needle-shapedandirregularlyrectangularcrystalsalsoappearedandagglomeratedwiththegranulestoformnodulesandtrabecula-likeorflake-likestructures.Conclusions:Sequenceofeventsofboneformationbyrabbitmarrowstromalstemcellsculturedinvitroisfullydepictedandconfirmed,whichprovidesthefoundationforfurtherinvestigatingthemechanismsofosteoblastdifferentiationfrommarrowstromalstemcellsandthepossibleapplicationinorthopaedics.