简介:1从很小时开始,我就想当艺术家。艺术家穿着灯芯绒的外套,留着长头发,蹲在派出所的墙下——李家口派出所里有一堵磨砖对缝的墙,颜色灰暗;我小舅经常蹲在这堵墙下,鼓起了双腮。有些时候,他身上穿的灯芯绒外套也会鼓起来,就如渡黄河的羊
简介:策划人语'电商'发展的迅猛势头有目共睹,时至今日几乎融入了社会的方方面面,并在社会发展中起到了巨大的'催化剂'作用。然而,在'电商'发展提质增效的趋势中,鱼龙混杂,管理方式不完善、诚信体系不健全、市场秩序不规范等问题渐次呈现,亟须采取措施予以解决。这其中,广被消费者'拷问'的症候之一,就是部分'电商'从业人员的诚信堪忧。商务部研究院信用研究所所长韩家平表示,目前'电商'领域失信情况十分严重,影响了正常的市场秩序、侵害了人民群众的合法权益,并且危及了相关产业健康发展。
简介:Chip-basedflow-throughPCRimplementsthePCRasacontinuousprocessfornucleicacidanalytics.Thesampleistransportedinawindingchannelthroughtemperaturezonesrequiredfordenaturation,annealingandextension.Mainfieldsofapplicationarethemonitoringofcontinuousprocessesforrapididentificationofcontaminantsandqualitycontrolaswellashighthroughputscreeningofcellsormicroorganisms.Amodulararrangementwithfiveheatingzonesforflow-throughPCRisdiscussedandevaluated.Thespecialheaterarrangementallowstheimplementationofupto40cyclesonthefootprintofamicroscopeslide,whichisplacedontopofa5zonesheatingplate.Liquid/liquidtwophaseflowofPCRreactionmixtureandmineraloilhavebeenappliedtocreateasegmentedflowprocessscheme.Inthatway,thedevelopedsystemmayprovideflow-throughPCRasaunitoperationforthedropletbasedmicrofluidicsplatform.ThesingleuseofdisposabledevicesiscommonlypreferredduetothesensitivityofthePCRprocesstocontaminations.All-glassmicrofluidicchipsanddisposablechipdevices,madefrompolycarbonateasareplicationwithidenticallygeometry,havebeenfabricatedandtested.Forthefirsttime,microchannelgeometrieswithnearlycircularprofiledevelopedbyall-glasstechnologyhavebeentransferredtomassfabricationbyinjectioncompressionmolding.Bothdeviceshavebeensuccessfullyappliedforthedetectionofthetumorsuppressorgenep53.Althoughproductyieldandselectivityoftheamplificationprocessdonotdependonthechipmaterial,awelldefined,reliablesegmentedflowregimecouldonlyberealizedintheall-glasschip.