y2003,idahogem,male;june,utahpioneer,male lu:2003,dewey ma:2003,prometea,female dog:in2005,thekoreanteamatseoulnationaluniversityexperiment,thehistoryofnabil althoughcloninghasmadeconsiderableprogress,thecurrentsuccessrateofcloningisstillverylow:dollywasbornbeforetheresearchersexperienceda276failedattempts;of70calveswerebornin9000afterattemptstobesuccessful,andone-thirdofthematanearlyagehaddied;prometeaalsotook328attemptsbeforeasuccessfulbirth.forsomespecies,suchascatsandgorillas,thereisnoreportsofsuccessfulcloning.thedogcloningexperimentshavealsobeenrepeatedhundredsoftimesandthentesttheresultsobtained. dollywasbornafterthetestingshowedthatagewasbornwhenitsolder.whenher6-year-oldwouldhaveonlyageneralold-agearthritis.thisisconsideredtheagingofthewearandtearcausedbytelomere.telomereislocatedattheendofchromosomes.withcelldivision,telomeresinthereplicationprocessofcontinuouswear,whichisusuallyconsideredtobeoneofthereasonsforaging.however,theresearcherssucceededincloningcattleonlytofindthattheyareactuallyyounger.analysisoftheirtelomeresthattheynotonlyreturnedtothebirthlength,andtimeofbirththantheaveragetelomerelonger.thismeansthattheycanbeefthantheaveragehavealongerlife,butduetoexcessivegrowth,manyofthemdiedprematurely.theresearchersbelievethattheresearchcouldeventuallybeusedtochangehumanlife. contrarytohumanlifeandhumancloningethics modernscienceandtechnology,especiallyinscienceandtechnologyofmodernlife,weshouldnotrespecttheprinciplesofethics,weshouldnotlistentothevoiceofethics?foranumberofscientificexpertslunaticsintheunitedstatesthepracticeofsecrethumancloningthat-contrarytohumancloningethicsofhumanlife. china'smediaarereproducedintheforeignmediarecentlyreportedasurprisingsource:agroupofmanipulationbythecultofscienceandlunatics,theunitedstatesnevadadeserttothedepthsofasecrethumancloningexperiment.accordingtobritishscientistswhocreatetheworld'sfirstclonedsheep"dolly"thesameprinciple,fromonewhodiedinfebruarythisyear,the10-month-oldbabyhadextractedtheunitedstatestocreateclonedhumancells.itissaidthat"ifeverythinggoessmoothly,theworld'sfirstclonedhumanwillbeborntheendofnextyear." afterthedisclosureofinformation,cloningtechnologyanditsethicalissuesbroughtaboutbythepeopleonceagainbecomeahotdebate.ifthisnewsistrue,howthemattershouldbe,howtocorrectlyevaluateandthinkaboutthisproblem,forthisreportervisitedthenationalhumangenomeresearchcenterofthesouthethical,legalandsocialdirectoroftheshanghaiacademyofsocialsciences,instituteofphilosophy,shenmingyinfellow. professorshensaid:since1997,theukroslininstitutesuccessfullycloned"dolly"thesheep,thefameandfortuneabroad,therehavebeendrivenin,andtriedtoengageinhumancloningresearch.althoughgovernmentsbanned,butthereportofhumancloninginrecentpresscoverageonmorethanoneoccasionoverthepasttwoyears.however,thespeedsofast,butalsoassociatedwiththecultreallyisappalling. thosewhohavelosttheirbeloveddaughter'sparents,hopethatthroughcloningtechnologytomakehisdaughterbacktolife,thisfeelingisunderstandable.butifthescientiststoconducthumancloningexperiments,itisworthdiscussion.professorshensaid:evenifwebrushasidethecult,whichisundesirable.on"humancloning"thisindividualisconcerned,hewilllivein"iamadeadperson'scopy"ofsuchashadow,whichhewillhavethepsychologicalimpactofwhat? inaccordancewiththeviewsofbioethics,scienceandtechnologyfromalong-terminterests,thebenefitofmankindasawhole.itmustfollowthe"dogood,notharm,autonomyandjustice"ofthesefourinternationallyrecognizedethicalprinciples."dolly"thesheep,afterthesuccessfulcloningofthefailureofmorethan200,deformityormortalityoccurredinthesheep.morecomplexandhumancloningwillundoubtedlyencountermorefailures,iftheproduceunhealthy,abnormalorshort-livedpeople,wouldbeaviolationofhumanrights. thediversityofthehumangenomeisthebiologicalbasisofhumanevolution,andthosescientificmadmantocreatetheso-called"eternallife"isactuallyareplicaofthesamegene,whichhasthepotentialtoreducegeneticdiversity,isnotconducivetohumanbeingsevolution.therefore,fromtheindividual,entity,orfromasocialevolution,bioethicsperspective,shouldberesolutelyopposedtocloninghumanbehavior. professorshenpointedoutthat:itisnowthecloningofthescientificcommunityisdividedintotherapeuticcloningandreproductivecloningoftwo.theformeristheuseofembryonicstemcellcloningofhumanorgansformedicalresearchtoaddresstheshortageoforgantransplantdonor,whichistheinternationalscientificcommunityandtheethicsofcommunitysupport,butthereisapremisethattherapeuticcloningforembryonicpregnancycannotexceed14daysoftheboundaries.asforreproductivecloning,knownashumancloning,sinceit,ingeneral,contrarytoethicalprinciplesoflife,sothemainstreamviewofscientistsisstronglyagainstit.unesco,theworldhealthorganizationandtheinternationalethicscommitteeofthehumangenomeandgovernmentsareveryclearthatoppositiontoreproductivecloning.evenifhumancloningisreallythebirth,westillhavetoadheretothisbasicposition. moder << 上一页 [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] ... 下一页 >>
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