简介:实在找不出一个词来形容DNA的神奇了,正是这些小得连电子显微镜都无法看清的小家伙,居然隐藏着我们的身高、体重、性格,智商,疾病、寿命等所有信息。另一方面,这种技术也让人担忧。因为假如一个人的性格、智力、会生什么疾病、什么时间死等等,都能通过DNA预先知道得清清楚楚,那多让人丧气!更有甚者,假如将来公司招聘人时通过DNA鉴定,把你的个人身体信息摸得一清二楚,我们岂不就会处于极不利的地位?保险公司为了追求高额利润,也来这一手,把有潜在疾病的人拒之门外,岂不有违保险的初衷……总之,假如你的一切都是由DNA决定的,这样的生活还有什么意思?就像一部惊险复杂的小说,你都知道了结局,还想读它吗?再者,别人又很容易获得你的这种个人隐私,从而决定你的命运,看来生活似乎更没有活头了!科幻电影《变种异煞》讲了类似基因决定命运的故事。
简介:Hidingdatainthedeoxyribosenucleicacid(DNA)canfacilitatetheauthenticationandannotationofimportantplantvarietyrights.Agrantofplantvarietyrightsforanewplantvarietygivesyoutheexclusiverighttoproduceforsaleandsellpropagatingmaterialofthevariety.Digitalwatermarkingtechniqueshavebeenproposedforawiderangeofapplications,includingownershipprotection,copycontrol,annotation,andauthentication.However,existingdatahidingmethodsforDNAchangethefunctionalitiesofDNAsequences,whichinducemorphologicalchangesinbiologicalpatterns.ThispaperproposesahighcapacitydatahidingschemeforDNAwithoutchangingthefunctionalitiesofDNAsequences.Thisschemeadaptivelyvariestheembeddingprocessaccordingtotheamountofhiddendata.Experimentalresultsshowthattheproposedschemegivesasignificantlyimprovedhidingperformancethanpreviousschemes.Andtherobustnessandsecurityissuesarealsoanalyzed.
简介:ThisstudyintendstoinvestigatehowtheelasticityofabacterialphagecanafecttheprocessofDNApackagingandejection.Forthispurpose,weproposeaunifiedcontinuumandstatisticalmechanicsmodelbytakingintoaccounttheefectsofDNAbendingdeformation,electrostaticrepulsionbetweenDNA–DNAstrandsandelasticdeformationofthephagecapsid.Basedonsuchamodel,wederivethequantitativerelationsbetweenpackagingforce,elasticityofcapsid,DNAlengthremaininginthecapsid,osmoticpressureandejectiontime.Thetheoreticallypredictedresultsarefoundtoagreeverywellwithinvitroexperimentalobservationsintheliterature.
简介:摘要本文通过探讨DNA定量细胞学检测技术诊断宫颈癌及癌前病变的相关因素及临床细胞学的特点,得出结论DNA定量细胞学检测能准确反应宫颈病变情况,HPV是宫颈上皮内瘤样病变(CIN)的重要相关因素,预防HPV感染,筛查和检测HPV感染对象,治疗及阻止CIN病变升级是防止宫颈癌的关键。