简介:苏州阀门厂为适应国际上对产品质量实施双重标准的要求,自1990年以来认真贯彻国际上通行的ISO9000“质量管理和质量保证”系列标准,并下决心抓好质量体系认证,尽快使质量管理与国际接轨。经过全厂职工的共同努力,分别于1991年和1993年通过ISO9002质量体系标准和ISO9001质量体系标准的认证,特别是ISO9001质量体系标准认证后,DNV认证机构至今已对苏州阀门厂的质量体系进行了3次年度复审并获得通过。1质量体系认证中所作的几项主要工作1.1学习标准,更新观念。对10大类计量器具进行管理的要求。又如对质量记录的管理应从以质量文件的管理要求来实施控制等,这些均应通过不
简介:ToobtainthermotolerantmutantsofG.oxydans,whichcanenhancethetransformationrateofL-sorboseto2-Keto-L-gulonate(2-KLG)at33℃inatwo-stepprocessofvitaminCmanufacture,ionbeamwasusedasamutationsource.GluconobacteroxydansGOandBacillusmegateriumB0wereusedinthisstudy.TheoriginalstrainGluconobacteroxydansGOwasmutatedbytheheavyionimplantationfacilityattheInstituteofPlasmaPhysics,ChineseAcademyofSciences.SeveralmutantsincludingGluconobacteroxydansGI13wereisolatedandcoculturedwithBacillusmegateriumB0at33℃inshakingflasks.TheaveragetransformationrateofthenewmixedstrainGI13-B0inpergram-moleculereached94.4%aftersevenpassagesinshakingflasks,whichwasincreasedby7%whencomparedwiththeoriginalmixedstrainG0-B0(GluconobacteroxydansG0andBacillusmegateriumB0).Moreover,thetransformationrateofI13B0wasstableat94%attemperaturesrangingfrom25℃to33℃,whichwouldbeofmuchvalueinreducingenergyconsumptioninthemanufactureofL-ascorbicacid,especiallyintheseasonofsummer.Toclarifysomemechanismofthemutation,thespecificactivitiesofL-sorbosedehydrogenaseinbothG0andGI13wereestimated.