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1.
INTRODUCTIONBillard ( 1 986)studiedthespermatozoonultrastructuresinteleostsandfounddistinctdifferencesa mongdifferentspecies.Studyonspermatozoonmorphologyandfunctionisachallengebecauseofthesperm’sspecialenvironment (Gageetal.,1 998;WangandZhang,1 999) .Sinceleft ey… 相似文献
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Numerical simulation and dynamic study of the wintertime circulation of the Bohai Sea 总被引:10,自引:2,他引:8
INTRODUCTIONTheBohaiSea,analmost closedshallowsea,liesnorthwesttotheYellowSea.Fig.1ashowsthege ometryoftheshorelineandthewaterdepthdistributionoftheBohaiSea,whichissmallandshallowcom paredwiththeYellowSeaortheEastChinaSea.Themeandepthislessthan 2 0meters.Be… 相似文献
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1 Introduction18Oinmarineenvironmentplaysanimportantroleinoceanographicalstudy .Asastableisotopeofoxygen ,18OtogetherwithhydrogenatomsconstituteswatermoleculeH218OandmoveswithalargeamountofH2 Omoleculesinseawater.Sothatδ18Obecomesanidealtracerforthemovemento… 相似文献
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The steps forward of GIS in China 总被引:2,自引:0,他引:2
1 HISTORICALSTEPS—ATEMPORALANA LYSISResearchesofGISinChinacandatebacktotheearly 1980s .Atthattime ,aremotesensingapplica tionprojectwascarriedoutinSouthwestChinausingGISmethodintegratedwithremotesensingdatatosolvetheareameasurementautomatically .Afterthefir… 相似文献
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INTRODUCTIONTheJapaneseseabass (LateolabraxjaponicusC&V)distributeswidelyinthecoastalwatersalongtheBohaiSea ,YellowSea ,EastChinaSea,andSouthChinaSea .Asacarnivorousfish ,itoccupiesthehightrophiclevelinthemarineecosystemandhasadaptedtovariousenvironmentalr… 相似文献
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INTRODUCTIONTheroleofalgalextracellularmetaboliteasabioactivesubstancetocontrolsuccessionofmi croalgalpopulationshadlongbeenrecognized (MastandPace,1 93 8;PrattandFong,1 940 ) .Somemicroalgae,likeChlorellavulgaris,Chlamydomonasreinhardtii,Skeletonemacostatum ,exc… 相似文献
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INTRODUCTIONKnowledgeofgametogenesisinvaluablemarineanimalsisveryimportanttocommercialfish ery.Gametogenesisinbivalveswasextensivelystudiedatdifferentlevels (Dohmen ,1 983 ;DorangeandLePennec ,1 989a,b) .Scallopsandothermarinebivalveshavesimilarreproductivecycle… 相似文献
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INTRODUCTIONTaoandChen (1 987)werethefirsttopointoutthattheAsiansummermonsooniscomprisedoftwosystems:EastAsiansummermonsoon (EASM )andSouthAsiansummermonsoon (SASM) .Theyaredistinctlydifferentfromeachotherinbothlarge scalestructureandconstituentsubsystems.Ther… 相似文献
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INTRODUCTIONTheSouthChinaSea (SCS)isasemi enclosedoceanbasinlocatedataspecialgeographicpo sition ,oneoftheworld’spronouncedmonsoonregions,withnortheastwindsprevailinginwinterandsouthwestwindsinsummer,andisacrucialregionofintensiveair seainteractionofgreat… 相似文献
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INTRODUCTIONTherearealotofpublishedpapersdescribingtheannualorseasonalendocrinechangesassoci atedwithreproductiveactivityinteleostfishes (Scottetal.,1 980 ;Louetal.,1 984 ,1 986;Suzukietal.,1 997;Hou 1 998;Yaronetal.,1 986) ,andevidencethatthegonadalmaturationofsalmo nidfishw… 相似文献
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ZOOPLANKTON COMMUNITY STRUCTURE OF THE SEA SURFACE MICROLAYER NEAR NUCLEAR POWER PLANTS AND MARINE FISH CULTURE ZONES IN DAYA BAY 总被引:1,自引:0,他引:1
INTRODUCTIONTheseasurfacemicrolayer (SM)withspecialphysical,chemicalandbiologicalproperties,hadbeenwelldescribedasasiteofintensiveaccumulationofdissolvedandparticulateorganicmat terinvolvingphytoplanktonandbacteria (Hardy,1 982 ) .Thisenvironmenthasgreatimpor… 相似文献
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INTRODUCTIONPufferfishesofthegenusTakifugu (Tetraodontiformes,Tetraodontidae)aremainlydistributedalongthecoastalregionsofChina ,JapanandKoreaandarecommerciallyimportanttothesecoun tries .Over 2 0specieshavebeenrecordedintheYellowSeaandtheEastChinaSea (Cheng… 相似文献
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INTRODUCTIONAccumulatedevidencessuggestedaclosecorrelationbetweenneoplasticdiseaseofaquaticor ganismsandtheincreasingreleaseofgenotoxinsbyanthropogenicactivitiesintoaquaticenvironment(Mix ,1 986;Gardneretal.,1 991 ;GESAMP ,1 991 ) .Ithas,therefore,becomenecessarytoe… 相似文献
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1IntroductionEarthvisionsoftwareintroducedfromU .S .DGIcompanycanplayanimportantpartinbothspatialgeo logicmodelingandcompilingdifferentmaps .Ontheba sisofrealizingsandbodymodelinganddatainterfacebe tweenDaqingblack -oilandEarthvision ,theFaciestractmodelhas… 相似文献
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《极地研究(英文版)》2002,(1)
CHINESEJOURNALOFPOLARSCIENCEisacomprehensiveacademicjournalsponsoredbytheChinesePolarAd ministrationandPolarResearchInstituteofChina.TheprimarypurposeistoreportcurrentimportantdevelopmentinpolarresearchofmanyscientificfieldsforscientificworkersinbothC… 相似文献
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INTRODUCTIONJiaozhouBayisashallowsemi closedbaywithtotalareaofabout 40 0km2 andaveragewaterdepthof7m .Themaximumwaterdepthisover 5 0matthecenterofthestraitconnectingtotheYellowSea.Thisstraitcenterwateriscalledbaymouthwater,thewaterinthenorthernpartofthestrai… 相似文献
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INTRODUCTIONTheWesternPacificWarmPool (WP)isaseaareawhereseasurfacetemperature (SST)isthehighestintheglobaloceansandair seainteractionisthemostviolentinthePacific.Manyre centresearchesshowedthatvariationsinthethermalconditions (inSST ,especially)oftheWPplay… 相似文献
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INTRODUCTIONScuticociliateshavelongbeenknowntobefoundingreatabundanceinallkindsofhabitats,andhavegreatdiversityinspeciesnumber,structure ,behaviorandotherbiologicalcharacters.Asacommonly foundtaxonfromcoastalwaterandculturebiotopes,Pseudocohnilembusharg… 相似文献
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Dimethylsulfide in the South China Sea 总被引:1,自引:0,他引:1
INTRODUCTIONGreateffortsweredevotedrecentlytostudyingdimethylsulfide(DMS)distributioninseawater,asitaccountsforthemajorpartofthesulfurfluxfromtheoceanstotheatmosphere.Moreover,itsoxidationproductsintheatmospheremayinfluenceenvironmentalacidificationand… 相似文献
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INTRODUCTIONH2,asanonpollutingfuel,seemstobeapreferablealternativeenergysourceofthefuture.Studyonbiohydrogen,coveringgenetic,physiologicalandbiochemicalaspects,hasbeenactivelypursuedinthelast100years,intheattempttoproducerenewableH2,particularlyrenewable“s… 相似文献