微囊藻水華毒素異構體的年度變化及其與環(huán)境因子的關系.pdf

1、華中師范大學碩士學位論文微囊藻水華毒素異構體的年度變化及其與環(huán)境因子的關系姓名：許敏申請學位級別：碩士專業(yè)：微生物指導教師：趙以軍2002.6.1AbstractAyearroundedinvestigationonbiomassofMicrocystisbloom，physiochemicalfactorsandmicrocystincontentswasconductedAlso，theinhibitorytestofmicrocy

2、stinonalgaelyingbacteriawascarriedoutOnthebasisofquantitativeanalysisof3microcystinvariants：MC—LR，MC—RRandMC—YRbyHPLC，therelationshipsbetweenmicrocystinandbiomass，watertemperatureandnutrients(ieN，P)werediscussedTheresult

3、shows：Microcystisproducedall3variantsofmicrocystin，butthecontentofMCRRwasmuchlargerthanMCLRandMCYRInmostcases，MCYRcontentwasratherlOWforHPLCanalysisForoneoftheeutrophicpondssurveyed，MC—RRandMCLRpresentedrisingtendencythr

4、oughoutthebloomintheyearThetoxicitypeaksalwayslaggedthegrowthpeaks，furthermore，thegreaterthebiomass，thelongerthelaggingdaysBothMC—RRandMC—LRgaverisetotheirmaximumvalueattheendofeverysinglebloomandsoonafteranewbloombeganI

5、ngeneral，theratioofMCRRandMC—LRremainedcomparativelyconstantduringeverybloom，butnoobviouschangecharacteristicwasobservedonMCYRcontentInthediscussion，inwasfoundthattoxinproducingofMicrocystiswasrelatedtobiomass，nutrientsa

6、ndwatertemperatureItwassuggestedthattheecologicalfunctionoftoxinproducingwasmostlikelyinhibitingthegrowthofotherorganismsSOastoresuminggrowthofMicrocystisandfurtheLforminganewbloomConcretelythegrowthofbacteriatakingadvan

7、tageofnutrientsaftercellbrokenofMicrocystiswasinhibitedbymaximalmicrocystins，thus，itwassuperiorforthealgaetouptakethereleasednutrientsandrecoveredfromthecompactingenvironmentsTheinhibitoryresultsofalgaelyingbacteriaunder