简介：ThecontentsofbiogenicelementsinChinamarginalseasedimentsarerelatedtotheirgrainsizes,rivertransport,etal.Ingeneral,thefinerthegrainsizeis,thehigherthecontentsoforganicmatterandOC,N,Pare,thelowerthecontentsofSandSiare.ThebiogeochemicalenvironmentsofsedimentsarerelatedtoEh,pH,temperaturecontentofOC,Fe3+/Fe2+radio,waterdynamicscondition,grainsizeofsediment,Ssysteminsedimentinterstitialwaters,etal.,andtheyinfluencetheearlydiagenesesandcycleofbiogenicelementsinsediments.InmostregionsofChinamarginalsea,thefluxdirectionsofS2-,HS-,3-NH4+H4SiO4,PO4,acrossthesediment-waterinterfacearefromsedimenttotheoverlyingseawater,thefluxdirectionsofSO42-,HCO3-,NO3-,NO2-acrossthesediment-waterinterfacearefromtheoverlyingseawatertosediment.Theirrigationoflivingthingsisimportantinthecycleofthebiogenicelementsacrosssediment-waterinterfaces.

简介：During1985～1987,theconcentrationofnitratenitrogenwashigherintheLaizhouBayandtheBohaiBaywhilethatofnitritenitrogenwashigherintheLiaodongBayandtheBohaiBay,Theconcentrationofnitratenitrogenwashighestinwinterandlowestinsummerwhilethatofnitritenitrogenwashighestinautumnandlowestinspring.theseasonalvariationoftheconcentrationofnitratenitrogenwasmaximumintheLaizhouBayandtheBohaiBaywhilethatoftheconcentrationofnitritenitrogenwasmaximumintheLiaodongBay.Therewasagreatdifferenceintheconcentrationofnitratenitrogenbetweenthesurfaceandthebottominautumnandintheconcentrationofnitritenitrogenbetweenthesurfaceandthebottominsummer.Themainreasonfortheseasonalvariationsoftheconcentrationofnitratenitrogenandnitritenitrogenwasthemarinebiochemicalprocess.ThenitratenitrogenandnitritenitrogenintheBohaiSeabasicallymaintainedaquasi-equilibriumstateseasonalcycle,Thequesi-equilibriumstateseasonalcycleofnitratenitrogenandnitritenitrogenatthebottomwasstablewhilethatatthesurfacewasliabletovariationscausedbyotherfactors.

简介：Vasa,whichisaconservedmemberoftheDEAD-boxproteinfamily,playsanindispensableroleinprimordialgermcellproliferation.However,theexpressionofvasageneduringthereproductivecycleinovoviviparousfishhasnotbeendocumented.Inthisstudy,thefull-lengthsequenceofvasawasobtainedfromtheovaryofKoreanrockfish(Sebastesschlegeli)usingreversetranscription-PCRandrapidamplificationofcDNAends.TheVasawithamatureproteinof650aminoacidsshowedgreatesthomology(84%)withgiantgourami(Osphronemusgoramy)andPacificbluefintuna(Thunnusorientalis).TheexpressionofvasamRNAinKoreanrockfishwasdetectedingonadsonly,suggestingitsspecificroleingonadaldevelopment.Inaddition,seasonalchangesinthevasaexpressionlevelswereexaminedingonadsbyquantitativereal-timePCR.Thevasatranscriptlevelsinadulttestiswerefoundhigherduringspermatogenesisthanduringspermiation.Thevasatranscriptlevelsremainedrelativelyhighattheearlyovarystagebutdeclinedduringovarymaturationinadultfemalefish.TheseresultssuggestthatthevasageneplayanimportantroleinspermatogenesisandearlyoogenesisduringthereproductivecycleofKoreanrockfish.

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简介：InordertodiscussthecontentdistributionsandfluxesofheavymetalsinsuspendedmattersduringatidalcycleintheturbiditymaximumaroundtheChangjiang(Yangtze)Estuary,thecontentsofheavymetals(Zn,Pb,Cd,CoandNi)havebeenanalyzed.Duringatidalcycle,theaveragecontentsofheavymetalsareintheorderofZn>Ni>Pb>CoàCd.Theaveragecontentsinebbtidearegenerallyhigherthanthatinfloodtide.However,attheinshoreSta.11,influencedbythecontaminationfromthenearbywastetreatmentplant,theaveragecontentsofZnandNiinfloodtidearehigherthanthoseinebbtideandattheoffshoreSta.10,thecontentofCdinfloodtidehigherthanthatinebbtideduetomarine-derivedmaterials.Thefiveheavymetals,mainlyterrigenous,aretransportedtowardseast-northeast,andsettledownwithsuspendedmattersintheareabetweenSta.11andSta.10.Influencedbymarine-derivedmaterials,thefluxvalueofCddoesnotaltersignificantlywithobviouslychanginginfluxdirectiontowardsnorthwest.Thesourceofheavymetals,thesalinityofwaterandtheconcentrationofsuspendedmattersarethemainfactorscontrollingthecontentdistributionsofheavymetalsduringatidalcycle.Thereisapositivecorrelationbetweenthecontentsofheavymetals(Zn,Pb,CoandNi)andthesalinityofwater,whiletheoppositecorrelationbetweenthecontentsandtheconcentrationsofsuspendedmatters.Becauseofmarine-derivedmaterials,thecontentofCdisnotcorrelatedwiththeconcentrationofsuspendedmattersandthesalinityofwater.

简介：Thispaperreportstheabsorption,accumulation,distributionandcycleofCu,Pb,Zn,CrandNiinS.apetala+S.caseolaris,mangrovecommunityatFutianMangroveNatureReserveofShenzhen,TheCu,Pb,Zn,CrandNicontentsinforestsoilincreasefrombottomtosurfacelayers,andthestorageofthefiveheavymetalsinthesurfacelayer(depth0-30cm)isZn>Pb>Ni>Cr>Cu.TheconcentrationabilityisS.caseolaris>S.apetala>K.candel.TheexistingaccumulationofCu,Pb,Zn,CrandNiinthecommunityis23019.63μg/m^2,23429.66μg/m^2.177870.42μg/m^2,6835.80μg/m^2,and12995.22μg/m^2,respectively.Theannualabsorptionis6592.57μg/m^2,2664.80μg/m^2,23123.56μg/m^2,853.24μg/m^2,and1990.95μg/m^2,respectively.Theannualreturnis3179.50μg/m^2,1300.65μg/m^2,7401.31μg/m^2,398.99μg/m^2,and646.20μg/m^2respectively.TheannualnetretentionaccumulationofCu,Pb,Zn,CrandNiinthecommunityis3413.07μg/m^2,1364.15μg/m^2,15722.25μg/m^2,454.25μg/m^2,and1344.75μg/m^2,respectively,TheturnoverperiodsofCu,Pb,Zn,CrandNiare8,19,15,18and21years,respectively.