拼音：xìtǒngfēnlèi英文：phylogeneticsystematics系统分类是指研究生物物种分类群间的系统的亲缘关系，以进行能反映这种关系的分类。这样得到的分类系统称系统分类（phylogeneticsystem）。这样得出的分类群，都是由来源相同的生物...
词条生物学...l晶胞中含4个Na—Cl结构基元，是面心立方型式的复晶胞。CsCl晶胞中只含1个结构基元(Cs—Cl)，所以是素晶胞，它是立方晶胞，故称为简单立方。金属钨立方晶胞中有2个钨原子，一个钨原子为一个结构基元，所以是复晶胞，称为体...
词条...hoare6monthsto5yearsold.It‘sjustabouttimetomakethatappointment,sincetheCDCsaysOctoberandNovemberarethebestmonthstogetvaccinated(thoughyoucanstillgetvaccinatedinDecemberorlater).Lastyear‘sfluvaccinationwon‘tdo.Expertsmakeanewfluvaccineeveryyear,basedontheflustrainstheyexpecttobemostcommonintheu...
健康English；Health News拼音：jīnshǔsè英文：cesium；caesium;Cs金属铯为遇湿易燃物品，在潮湿空气中能自燃，遇水、酸或水蒸气发生化学反应放出氢气和大量的热而出现燃烧爆炸危险；与氧、硫、磷、卤素能剧烈反应，发生燃烧爆炸。沸点：679℃熔点：...
词条...ourheartrateupalittlebit.Vigorousphysicalactivitiesincludedrunningandaerobics--thesortofactivitythatreallypushesyourheartrateandbreathing.TheCDCtotaledthenumberofpeoplewhomeetatleastoneofthesestandards:Moderatephysicalactivity:Atleast30minutesperdayon5ormoredaysperweekVigorousphysicalactivity:Atleas...
健康English；Health News...d,HIV.“Itisaparticularissuefornonwhites,forbothAfricanAmericansandHispanics,“Jaffesays.“Andthoseareveryhardpopulationstogetto,becauseifyouaskthemtoidentifywithmessagestailoredforthewhite,mainstreamgaycommunity,thatmaynotbeeffective.“作者：DanielJ.DeNoon
健康English；Health News...nalysisquestionsthepreferreduseofcertainbloodpressuremedicationsoverdiureticsinpeoplewithmetabolicsyndrome.Theanalysisshowsthiazidediureticsworkedaseffectivelyattreatinghighbloodpressure--andinsomecasesbetter--thancalciumchannelblockers,ACEinhibitors,oralpha-blockersinpeopleathighriskforcomplication...
健康English；Health News...rwhenscreenedastoddlersinastudypublishedintheAprilissueofthejournalPediatrics.Thechildren,whoarenowpreschoolage,areundergoingfurthertestingtodetermineiftheymeetthediagnosticcriteriaforautismorrelateddisorders.Thevery-low-birth-weightbabiesinourstudydidshowahighprevalenceofautisticbehaviorsinearlyscr...
健康English；Health News...lls.ThefindingsarepublishedintheMay/JuneissueofthejournalAmbulatoryPediatrics.“Thisstudyshowsthatanyseparationcreatesadisruptioninthefamilythatmostlikelywillhavearippleeffectforlearning,“Jeesays.DocsCanHelpIdentifyKidsatRisk：Sheaddsthatpediatriciansmaybeinauniquepositiontoidentifychildrenatris...
健康English；Health News...operlybyhospitalstaffers.Butanotherstudy,reportedMondayinthejournalPediatrics,suggeststhatfrequentuseofdisinfectingwipesandhandsanitizersintheclassroomcanreduceschoolabsenteeismcausedbybacterialandviralillness.Disinfectingwipesandalcohol-basedhandgelsarenowwidelyusedinhospitals,schools,andotherpubli...
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