转基因食品介绍(英语课前演讲)

GeneticallymodifiedfoodTherearenostrictboundariesbetweenfoodandpoison14Geneticallymodifiedfood(GMF)referstothefoodusinggeneticengineering(GM)technologyinthespeciesgenome(基因组；染色体组)toembed(嵌入)inheterologous(异种的)gene,includingtransgenic(转基因的；基因改造的)plants,geneticallymodifiedanimal,andgeneticallymodifiedMicrobial(微生物的)food.The1stkindGMF：transgenic(转基因的；基因改造的)plantsfoodThe2ndkindGMFGeneticallymodifiedanimalfoodThe3ndkindGMFGeneticallymodifiedmicrobialfoodThe4ndkindGMFGeneticallymodifiedspecialfoodTheadvantagesofgeneticallymodifiedfood1.Highnutrition2.Specialimmunevalue3.Improvingtaste4.ImproingfoodqualityThedisadventagesofgeneticallymodifiedfoodContentTitletransgenicfoodmayproducepotentialbiologicalmutations(突变)andnewtoxin（毒素）infood,inaddition,manyfooditselfcanproducelargeamountsoftoxicsubstancesandantinutritionalfactors,suchasproteininhibitors,dissolvingthrombus,neurotoxintoresisttheinvasionofpathogensandinsects,Intheprocessofgeneticallymodification,becauseofgenemakesthetoxinproteinsexpression,produceallsortsoftoxicitypoisoninpansIIn1999,theresearcherattheuniversityofCornellJohnLoseyissuedareportintheBritishjournalnature,feedingbutterflieswithleavescoatedbytravnsgenicBtcornpollen,resultingin44%ofthelarvaedied2007,FrenchscientistsconfirmedthatmonsantoageneticallymodifiedcornproductionhastoxicitytothehumanliverandkidneyextGeneticallymodifiedfoodsafety,andtheevaluationofthetestsafetyassessmentsofGMF:1:Thecharacteristicsofnewgeneproducts2:analysisofchangesofcontentofnutrientsandknowntoxins3:Potentialallergenicitystudies4:thepossibilitiesandinflenceofGMfoodmicroorganismsgeneticexchange5:thenutritionalevaluationinvivoandinvitrooftoxicologyprinciplessubstantialequivalence(实质等同性原则)casebycase(个案评估的原则)stepbystep(逐步评估)balancesofbenefitsandrisks(风险效益平衡的原则)familiarity(熟悉性原则)Precaution(预先防范)precaution