简介:A New Neutron-deficient Isotope 235AmANewNeutron-deficientIsotope235Am¥LiuHongye;GuoJunsheng;GanZaiguo;YangWeifan;ShiLij...
简介:Westudiedtheeffectsofnitrogen(N)andphosphorus(P)supplyonFv/Fm(maximalquantumyieldofphotosystemII)inthealgaeChaetocerosdebilis,Dicrateriainornata,PlatymonassubcordiformisandHeterosigmaakashiwotodeterminethesensitivityofFv/FmtoP-limitationofthefourspecies.ObviousdecreaseofFv/FmvaluewasmonitoredinperiodsofP-depletion,thedecreaseshowingdifferentmagnitudesamongalgalspecies.AmorecleardecreaseofFv/FminPlatymonassubcordiformisandHet-erosigmaakashiwowasobserved,comparedwiththatinChaetocerosdebilisandDicrateriainornata.AftertheresupplyofP,theindexFv/Fmofthefourspeciesallrecoveredquicklyin24h.CelldivisionwasmaintainedandchlorophyllcontentcontinuedtoincreaseuntiltheendoftheexperimentinPlatymonassubcordiformisandHeterosigmaakashiwo,whileinChaetocerosdebilisandDicrateriainornata,thedivisionstoppedinthelaterperiodwhenthegrowthoforganismscameintothestationaryphase.ThemostobviousrespondofchlorophyllcontenttoP-additionswasobservedinHet-erosigmaakashiwoculturein24h.ThesensitivityofFv/Fmtonutrientlimitationsisdifferentamongalgalspecies,andmuchshouldbedonetoimprovetheapplicationofthisindex.
简介:TheeffectofreflectionontheperformanceofAM-VSBCATVlightwavesystemsisanalyzed.Usually,therearethreekindsofreflectionexistingintheAM-VSBCATVlightwavesystems:multipathinterference(MPI),doubleRayleighbackscattering(DRB)andexternalopticalfeedbackTheMPIandexternalopticalfeedbackcanbeneglectedowingtousingtheFC/APCconnectorsandisolatedDFBalsersinthesystemlink.ItisshowntheoreticallyandexperimentallythattheDRBisthelimitationofthenoiseinducedbyreflection.
简介:NatsumeSōseki(1867-1916)sufferedfromcyclicmentaldepressionsthroughhislife,anditwaswhenhewasinthestateofthemostterribleonethathestartedhiscareerasawriterbywritingIAmaCat(1905-1906).TherearesomeevidencebyhiswifeandfriendsthatSōseki’sconditionofdiseasedramaticallyimprovedduringitsserializationonamagazine,andthewriterhimselfadmitedhumorouslyintheprefaceofotherworkthatitwashisdepressionandmaniathatenabledhimtoproduceIAmaCatandotherearlyworks.Thispaperaimsatdescribingtheprocesshowhisactofnarratinghadtherapeuticeffectsonhisstateofmindfocusingontheconstructionofcomplicitousrelationshipbetweenanimpliedauthorandreadersintheworkbytheuniquefunctionsofthefirst-‘person’narrator:ACat.Amongothers,IwillconsidertheinfluenceofLaurenceSterne’sTristramShandy(1759-1767),whichSōsekiintroducedtoJapanforthefirsttime,bydiscussingthefrequentuseofmetalepsisthatthetwoworkshaveincommon.
简介:摘要:丛枝菌根(AM)真菌是一类重要的土壤有益微生物,能帮助植物获取养分,提高抗性,在绿色农业发展中存在巨大应用价值。然而,由于AM真菌必须与根系共生才能完成生命周期,因此菌剂的获取与扩繁成为真菌应用的重要制约因素之一。本文从AM真菌的分离、鉴定和扩繁3个方面介绍了相关研究领域的前沿动态,旨在推进对AM真菌培养技术的深入研究,并为科学研究和生产实践中AM真菌的培养提供技术参考。AM真菌的分离湿筛法较为普遍,鉴定主要采用生理或分子生物学方法,传统的扩繁方法以盆栽法和毛根无菌扩繁法为主,而最近新报道的液体培养法和非共生培养法则为AM真菌的扩繁提供了更多可能,为液体条件下的真菌应用和菌剂的批量生产提供了新思路和新方法。