欢迎来到天天文库
浏览记录
ID:48714268
大小:9.40 MB
页数:55页
时间:2020-01-26
《ENVIRONMENTAL MICROBIOLOGY.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、27EnvironmentalMicrobiology環境微生學MicrobialDiversityMicrobesliveinavarietyofhabitatsbecauseoftheirabilitiestoUseavarietyofcarbonandenergysources.Growunderdifferentphysicalconditions.ExtremophilesliveinextremepHTemperatureSalinityExtremophiles,極端嗜好菌代謝多樣性Meta
2、bolicDiversityandHabitatsLearningObjective--Defineextremophile,andidentifytwo“extreme”habitats.--p.810MycorrhizaeFungilivingincloseassociationwithplantrootsExtendsurfaceareaofrootsFigure27.1菌根吸根Fig.27.1Mycorhizae.QOfwhatvalueisamycorrhizaetoaplant?Fig.27.
3、1(b)EctomycorhizaThemycelialMantleofatypicalectomycorrhizalfungusSurroundingaEucalyptustreeroot.Symbiosis,共生Ex.Ruminant==>rumenArbuscules,吸根植物細胞壁菌絲面紗Fig.27.1(a)Endomycorhiza(esicular-arbuscularmycorrhiza).MetabolicDiversityandHabitatLearningObjective--Def
4、inesymbiosis--Definemycorrhiza,differentiateendomycorrhizaefromectomycorrhizae,andgivenanexampleofeach.Symbiosis--p.810CommercialUsesofMycorrhizaeFigure27.2w/菌根>>生長良好w/o菌根>>生長差松露菌根Fig.27.2Mycorhizaehaveconsiderablecommercialvalue.QWhyaremycorrhizaevaluabl
5、efortheuptakeofphosphorus?SoilMicrobiologyandBiogeochemicalCyclesLearningObjective--Definebiogeochemicalcycle.--p.811BiogeochemicalCycles地球化學循環Recycling(oxidationandreduction)ofchemicalelements--soilasa"biologicalfire."再生/再循環LearningObjective--Outlinethe
6、carboncycle,andexplaintherolesofmicroorganismsinthiscycle.SoilMicrobiologyandBiogeochemicalCyclesTheCarbonCycle--p.811TheCarbonCycleFigure27.3碳循環固定死亡的生物化石燃料食用分解甲烷Fig.27.3Thecarboncycle.QWhateffectdoestheaccumulationofcarbondioxideintheatmospherehaveonthe
7、Earth’sclimate?LearningObjective--Outlinethenitrogencycle,andexplaintherolesofmicroorganismsinthiscycle.--Defineammonification,nitrification,andnitrogenfixation.SoilMicrobiologyandBiogeochemicalCyclesTheNitrogenCycle--p.813TheNitrogenCycleFigure27.4氮循環硝化
8、作用氨化作用固氮作用去硝化作用分解作用去硝化細菌氨化作用豆科植物豆科植物Fig.27.4Thenitrogencycle.QWhichprocessesareperformedexclusivelybybacteria?NitrogenCycleN2Nitrogen-fixationAmmonia(NH3)Nitrateion(NO3-)PseudmonasN2Nitriteion(NO2-)NitrobacterNitrat
此文档下载收益归作者所有