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8 个结果
  • 简介:Allorganisms,rangingfromsingle-celledorganismstohumans,demonstratecircadianrhythmsthatarenear24-hpatternsthatarepresentindependentofenvironmentalcues.Disruptionofthisprocess,calledcircadianmisalignment,isassociatedwithdeleterioushealthoutcomes.Themostextremeexampleofthismisalignmentisshiftwork,andthereisevidencesuggestingastrongassociationbetweenshiftworkandcertaincardiovascularoutcomes.Theoutcomesofmoststudiesincludeobesity,metabolicsyndrome,hypertension,type2diabetesmellitus,atrialfibrillation,andcardiovascularevents.Inthisarticlewereviewthecurrentliteraturewithanemphasisonwomen’scardiovascularhealth.Thedataareconflicting,andthereisapaucityofrobustevidencewithregardtowomen’scardiovascularhealthandcircadianmisalignment.Morestudiesareneededtobetterdelineatethesexdifferencesaswellasthepathophysiologyoftheassociationsbetweencircadianmisalignmentandcardiovasculardiseasessothatwecanprovidepatientswithmorepersonalizedcare.

  • 标签: SHIFT work CIRCADIAN MISALIGNMENT METABOLIC syndrome
  • 简介:OneofthethreethingsIcannotresist~1lovingistherhythmofsongs.NowIhavetorephrase~2it.WhatIcannotresististherhythmicsongsplayedinrunningvehicles.Thiswinterbreak,IwenttoCaliforniatovisitsomeofmyfriends.Trying

  • 标签: 课外阅读 初中英语 阅读训练 优秀文章
  • 简介:Rhythmofbrainactivitiesrepresentsoscillationsofpostsynapticpotentialsinneocortex,thereforeitcanserveasanindicatorofthebrainactivitystate.Inordertochecktheconnectivityofbrainrhythm,thispaperdevelopsanewmethodofconstructingfunctionalnetworkbasedonphasesynchronization.Electroencephalogram(EEG)datawerecollectedwhilesubjectslookingatagreencrossintwostates,performinganattentiontaskandrelaxingwitheyes-open.TheEEGfromthesetwostateswasfilteredbythreeband-passfilterstoobtainsignalsoftheta(4-7Hz),alpha(8-13Hz)andbeta(14-30Hz)bands.Meanresultantlengthwasusedtoestimatestrengthofphasesynchronizationinthreebandstoconstructnetworksofbothstates,andmeandegreeKandclustercoefficientCofnetworkswerecalculatedasafunctionofthreshold.Theresultshowshigherclustercoefficientintheattentionstatethanintheeyes-openstateinallthreebands,suggestingthatclustercoefficientreflectsbrainstate.Inaddition,anobviousfronto-parietalnetworkisfoundintheattentionstate,whichisawell-knownattentionnetwork.Theseresultsindicatethatattentionmodulatesthefronto-parietalconnectivityindifferentmodesascomparedwiththeeyes-openstate.Takentogetherthismethodisanobjectiveandimportanttooltostudythepropertiesofneuralnetworksofbrainrhythm.

  • 标签: 大脑活动 功能网络 同步功能 节奏 基础 相分析
  • 简介:Thispaperaimstoconfirmtheoptimalpruningintensitytopromotepaulowniagrowth.Annualdynamicof8growthindicatorsforpruningofthree-year-oldPaulowniatopromotetnmkextensionweresimulatedunder7treatments.TheresultsshowedthatannualgrowthprocesscouldbemodeledreliablybyRichards'function.Eightgrowthparametersweredevelopedincludingfast-growingpoint(t0),initialpointoffast-growingperiod(tl),finalpointoffast-growingperiod(t2),fast-growingperiod(t),growthperiod(Dg),maximumdayincrement(AGRmax),maximumannualincrement(A).Effectsofpruningtopromotetrunkextensionongrowthparameterswereanalyzed.Paulowniaremaining3-6lowerbranchesafterpruninghadrelativelylongerfast-growingperiod(t),growthperiod(Dg),higheraveragedayincrement(Am),maximumdayincrement(AGRmax)andmaximumannualincrement(A).Therefore,lowerdiametergrowthoforiginaltrunkdidnotdecreasesignificantly,andupperdiametergrowthincreasedtosomeextent,Heightanddiametergrowthofgraftingtrunk,andformratioofgraftingtrunkwererelativelyhigher.Totalstockvolumeincrementwasimprovedsignificantlyundertheconditionthatstockvolumeincrementoforiginaltrunkdidnotdecrease.

  • 标签: 泡桐 生长规律 修枝 主干生长
  • 简介:Nitratereductaseactivity(NRA)indifferentplantorgansandleavesindifferentpositionsofCamptothecaacuminataseedlingswasdeterminedbyanInvivoassay,thediurnalvariationrhythmofNRAinleavesofdifferentpositionswasobserved,andthecorrelationsbetweenleafNRA,leafareaandlaminamassperunitarea(LMA)werealsoexamined.TheresultsshowedthatNRAintheleafwassignificantlyhighest,comparedwiththatinotherorganssuchasroots,stemsandleaves.Inthisexperiment,the10leaveswereselectedfromtheapextothebaseoftheseedlingsinorder.ThedifferentNRAoccurredobviouslyinleavesofdifferentpositionsofC.acuminataseedlingsfromtheapextothebase,andNRAwashigherinthe4th-6thleaves.ThediurnalchangerhythmofleafNRAshowedaonepeakcurve,andmaximumNRAvalueappearedataboutmidday(at12:30orso).NoobviouscorrelationsbetweenNRAandleafareaorlaminamassperunitareawereobserved.ThisstudyofferedscientificfoundationforthefurtherresearchonnitrogenmetabolismofC.acuminata.

  • 标签: 喜树 幼苗 硝酸还原酶 酶活性 叶片
  • 简介:AbstractType 2 diabetes mellitus (T2DM), a worldwide epidemic disease, has caused tremendous economic and social burden, but the pathogenesis remains uncertain. Nowadays, the impact of unrhythmic circadian clock caused by irregular sleep and unhealthy diet on T2DM has be increasingly studied. However, the contribution of the endogenous circadian clock system to the development of T2DM has not yet been satisfactorily explored. It is now becoming clear that the gut microbiota and the circadian clock interact with each other to regulate the host metabolism. Considering all these above, we reviewed the literature related to the gut microbiota, circadian clock, and T2DM to elucidate the idea that the gut microbiota is closely tied to the regulation of the circadian clock in the development of T2DM, which provides potential for gut microbiota-directed therapies to ameliorate the effects of circadian disruptions linked to the occurrence and development of T2DM.

  • 标签: Gut microbiota Circadian clock Type 2 diabetes mellitus Metabolites
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