简介：The20thcenturyisacenturyinwhichhumanmaterialcivilizationandmedicinedevelopedthemostrapidly,manycausesofdiseasesunknownbeforewerefoundmolecularly,manydiseasesorterminaldiseasesuncurablebeforewerecuredwithnewtherapeuticmethods,manyfatalcontagiousdiseasesthathadcausedcorpsoverthewildernesswerecontrolledeffectively,cathetertechniquesandoperationscouldbeusedanywhereinthehumanbodysolongastheywereneeded,andnewdiagnosticandtherapeutictechniquesemergedoneafteranother;medicalprogressmadeanever-lastingcontributiontohumanhealth.

简介：区别，房间的逐步的专门化，andtransdifferentiation，一种房间类型的明显的切换进另外一个，捕获许多干细胞聚光灯。但是dedifferentiation，在它前的一个房间的发展颠倒重新发明自己，也是一个重要过程。在多细胞的有机体，细胞的dedifferentiation是位于新干细胞系的totipotency，新生和形成下面的主要过程。Inhumans，dedifferentiation经常与carcinogenesis被联系。在动物的cellulardedifferentiation的学习，与细胞命运开关和决心有关的特别地早的事件，被一个合适的、方便试验性的系统的缺乏限制。dedifferentiation的经典例子是在urodele两栖动物的手足和尾巴新生，例如蝾螈。最近，当与适当信号或材料刺激了时，几个调查者证明了某些哺乳动物的房间打罐头嬉痞的集会duced到dedifferentiate到祖先房间。这些发现打开研究人员们可能由在vivo导致细胞的dedifferentiation提高哺乳动物的内长的再生能力的可能性。

简介：Inpatientswhohavesustainedtraumaticbraininjurywithassociatedextremityfracture,thereisoftenaclinicalperceptionthattherateofnewboneformationaroundthefracturesiteincreases.Anovergrowthofcallusisobservedandectopicossificationevenoccursinthemuscle,butthemechanismremainsunclear.Whetherthisrapidly-formednewboneisfracturecallusoravariantofheterotopicossification,acommoncomplicationoftraumaticbrain

简介：Aim:Tostudythestrengthandmicrostructureoftrace-Ti-bearingstracturesteel.MaterialsandMethods:ThestrengthandmicrostructureofthetraceTibearingstructuresteelwerestudiedbytwokindsofcontrolledcoolingsimulationtestingresultsinthefirststagecoolingandthelaststagecoolingafterhotpressdeformationinthetrace-Ti-bearingstructuresteel.Results:Itshowedthattheferritegrainsize,therelativecontributionoftheinvolvedstrengthandthemechanicalstrengthwereinfluencedmoreorlessbydifferentcoolingrates.Boththerefinementofferritegrainandtheincreaseofmechanicalstrengthcouldbeobtainedbytheproperdecreaseofwatercoolinginterruptiontemperature(WTI)andcoilingtemperature(CT)inthefirststagecoolingortheproperincreaseofwatercoolingbeginningtemperature(WTB)andproperdecreaseofcoilingtemperature(CT)inthelaststagecooling.Conclusion:Thestrength,theferritegrainrefinementandtheyieldtensileratiointhefirststagecoolingprocessaremuchbetterthanthoseinthelaststagecoolingprocess.

简介：摘要：

简介：摘要：2020年，我国注册护士总数