共查询到20条相似文献,搜索用时 734 毫秒
1.
ImODUcrIONThetermphlorotanninswascoinedbySattlerinl974(dtalinRagan&Glombiha,l986)forthebrownalgalpolyphenoIshavingcheAncalcharacteristiesoftannins.Later,theirstmCturalunitwasprovedraaganandGlombitsa,l986)tobephlorogludnol(i.e.l,3,5-trihydroxybename).OginoandTaki(l957)notalthattheaqueousextraCtSoffreshthalliofSargassumringgoldianumhavetanninproperties(tumingbluishorreddishvioletafteradditionofironsaltS,astringenttaste,andabilitytopredpitategelatin).HighmolecularweightpolyphenoIsfromAsco… 相似文献
2.
IwrRODUcrIONBiochewhcalindiasrnaybeusedtoreboresponsestospedccontandnantSincludingheaVyrnetaIs.ChineseshrimpfisheriesarebasedonpenaeidsofWhichPenaeuspoiciIlatusistheddrinantsthe(Xuetal.,l993)incoastalwatersofFujianProvince.Larvalpenaeids(Andelsonetal.,l976)likeotherplanktoniccrustaonns(Clarkl992),arepartioulariysensitivetoheaVymetalcontandnatedwaterduetothefortnationofmetalbindingproteinsintheirbodies.Cytoplasndcproteins,dondnatedbythestilphydrygrouphave~reportedinvariousdassesofphylog… 相似文献
3.
INTRODUCTIONSaboty,pH,nitrogenousandphosphatenutrientShaveirnPohantfunctonsinthecIJltUreofbenthicdiatoim.Chen(l977)suggestalthatN,P,FeandSinutrientsshouldbeaddedt0thes3OfiltetalanWhterforculturingbenthicdintoim.AmongthenutrientS,theusualratioofNt0Pwasl0.pHwnrnaintainedat8.O-8.2.AuStin(l99())ProVedthattheNfPrati0shadirnP0rtanteffch0nthegroWthandCellcomPositionoftheatta-chedtoabaloneorganjsimrnaiulyconsistingofvariouskindsofbenthicdint0im,thusind~yhadsubsequenteffchonjuvedeabalone… 相似文献
4.
INTR0DUCnONErhailake,thesecondlargestlakeintheYUnnanPlateauinS0uthWstChina,islo-catedinDaliDefecthe25035'to25"58'N,looo05't0l(X)o07'E(Fig.l)-The40kInlong3-9kInwidelakeisnaInedafteritsearlikeshape.ItsbasicchimteristicsaregiveninTablel.EtheibeeisampicalriftlakeintheDalibasinwhichdeveloPedalongtheYuaniangHongheThewestsideofthebasinisformedbytheDiancangMountainwhichconsists0frock(PrecaInbrianschistandgneissandMiocenemetaInrphiclimestone).TheseisndcallystillactivemoUntainrangrisab0ut… 相似文献
5.
Thethreatagainstthecoastallowlandcausedbysea-levelriseisoneofthefocusesoftheworid'sat-tention.Thebestestimatevalueofglobaltheoreticalsea-levelriseinthe2lstcenturyisO.66m(SCOR,l99l)byworldwideauthoritativeorganizationsuchasIPCC(IntergovernmentPanelofClimateChange)etal.ThecrustofChangiiangDeltaissubsiding.Theaveragesubsidencerateinthelast2OOOaisl.2mm/a(PANetal.,l985).TheislandsoftheChangiiangRivermouthareaccumulatinglowlandislandsandtheirnat-uralelevationisbelowthehightidallevelofsprin… 相似文献
6.
SORPTION OF BENZOTHIOPHENE ON MARINE SEDIMENTS 总被引:2,自引:0,他引:2
ImODUcrIONBenzothiophene(acomPoundinp0lycydicarornaticsulfurheterocydespresentincrudeoilsandcoal)isaddedt0marineenvironmentfromavariCtyofsouna,andisofenvironrnentalconcernduetoitSharmfulproperties(Andefssonetal.,l992,Yang,l996).Warner(l975)obtainedsulfur-containingpetroleumcomPonentSsuchasbensothiophenefr0mrnarinesamplesandfoundthatthepolycydicarornaticsuifurheterocydesweremorercadilybioconrmtratedthansulfur-freep0lycydicaromaticcompounds.Yang(l997)foundthatbensothiophenewaspresentinallin… 相似文献
7.
ChntnbutionNo.3127fromtheInstituteofOceanology,ChinereAcademyofSciences.Project39370542supportedbyNSFCandstudyalsosupportedbyNationalKeyLaboratoryintheInstituteofHydrobiology.ChineseAcademyofSciences.lNTRODUCTIONltisknownthatgroWthrateoffishcanvary'inresponsetotemperatureandfoodavailability-andperhapslessobviously,tolight,oxygenandothervariables.ThispropertyofvariablegroWthinfishcanbereferredtoasplasticity(Weatheriey,l990).TheeffeCtSofenvironmenta1thCtorsongroWthcanbepredictalfor… 相似文献
8.
STUDIES ON CULTURE CONDITIONS OF BENTHIC DIATOMS FOR FEEDING ABALONE I.EFFECTS OF TEMPERATURE AND LIGHT INTENSITY ON GROWTH RATE 总被引:2,自引:0,他引:2
INTRODUCTIONBenthicdiatomscomPrisethemaininitialfoodforjuvenileabalone.ItisimPortanttocIJlturehighqualitybenthicdiatornsduringtheeariystageofjuvenileabaloneculture.AtpresentthespeCesofbenthicdiatomsusedinabalonebedingfannsprirnarilycomefromnaturalpopulations.SomespedesinseveralgenerasuchasNavicula,Ntzchia,Caroneis,Achnanthes,AmPhoraareusuallythedothenantspch(Chen,etal.,l977,Ukiandaxuchi,l979,Nonnan-Boudnauetal.,l986,Austinetal.l990).Inordertoselodsornespedeswithhighadaptability,fas… 相似文献
9.
The effect of light intensity ( 1500 Ix and 5000 Ix) on the total lipid and fatty acid composition of six strains of marine diatoms Cylindrotheca fusiformis (B211 ), Phaeodactylum tricornutum (Bl14, Bl18 and B221) Nitzschia closterium (B222) and Chaetoceros gracilis (B13) was investigated.The total lipids of B13, Bl14, and B211 grown at 5000 Ix were lower than those grown at 1500 Ix. No evident changes were observed in Bl18, B221 and B222. Fatty acid composition changed considerably at different light intensity although no consistent correlation between the relative proportion of a single FA and light intensity. The major fatty acids of the 6 strains were 14:0, 16:0, 16:l(n- 7) and 20:5(n-3) . Cylindrothecafusiformis had high percentage of 20:4n - 6 (9.2 - 10.9% ) . The total polyunsaturated fatty acid /rl all 6 strains decreased with increasing light intensity. The percentage of the highly unsaturated fatty acid eicosapentaenoic acid (EPA) decreased with increasing light intensity in all strains except Chaetoceros gracilis. 相似文献
10.
unODUcrIONIntereStinthecarboncycehasinamsedbouseoftheobservedincreaseinatmosphericCO,leveIsduetothebumingoffossilfuelandthedearingofforestsre-sultinginlargedhaticandbiogeochdrica1consequenas(ChenandDrake,l986).Experi-mentalstudisofp1antShaveshownresponsesoftypically2O%-4O%highergroWthunderdoubledCo,conditions.Ontheotherhand,theeffedofelevatalCO=conditionsinincreasinggroWth,knownastheCO,fertilimtioneffed,isnotbe1ievedtobetwortantintheoasns(Schimeletal.,1995).Althoughithasbeensuggestedt… 相似文献
11.
Therearemorethan4Ookindsofcarotenoids,aboutl(X)ofwhichcanbeObtainedfromoceanicmicrobesandalgae,sooceanicalgaeareconsideredthemostimPOrtanre-sourceofnaturalcarotenoids(Becker,l982).DunaliellaSalinahasdrawnnmehattentionfromanuInberofcountriesrecently,asmoreandmorestudiesshowedthatthisunicellularalgacanaccumulatelargeamountsof5-caroteneundercertainenvironmentalconditions(Li,1988).SuInInallzingthebiosyntheticmechanismof3-carotene,weknowthatacetylCoAandCO2arethehasicInaerialsfOrSYthesizing3-… 相似文献
12.
INTRODUCnON-WatertemperatheanddissolvedoxygenareimportantenvironmentalfactorsinthegmwthanddevelOPmntofaqUaticorgAnsms.ThereareInanPublishedstUdiesontheox-.ygenconsUInPtionrate(OCR)oftheprawn')(WangJim,l986;WangDanghenetal-,199l;ZangWeilingetal-,l992,l993),buttheydidnotcontalndetailedinfonnaionabouttheeffectoftemPerabeontheOCR-ThePresentstudydetendnedtheOCRofju-venilesofChineseprawn,gianttiserprawnandgiantfreshwaterprawnthatwererearedatdifferenttemperatllresforaboutaweekattheCaoj… 相似文献
13.
EFFECTS OF TEMPERATURE AND Ca^2+ ON THE LARVAL DEVELOPMENT OF THE DECAPODA CRUSTACEAN : ERIOCHEIR SINENSIS 总被引:1,自引:0,他引:1
With increasing demand in China for the mitten crab larvae, understanding its survival mechanism gets more important. This research focused on the effects of temperature and Ca^2 on the larval growth and development. Eriocheir sinensis larvae were reared in laboratory under 21 different combinations of temperature (15, 20, 25℃) and Ca^2 content (120, 130, 140, 150, 160, 170, 180mg/l) and constant salinity (20) and pH (8), The results suggested that the survival rate increases with temperature and Ca^2 content. These combinations of temperature and Ca2 content maximized survival rate inour study and it may be the optimum water environmental conditions for culturing the larvae. To predict surviving larvae number under different water environmental conditions, 21 dynamic mathematical models were developed. This for the first time observation of the zoeal Ⅵ larvae of the Changjiang River E.sinensis population showed that they occurred under stressed water environmental conditions: temperature of 15℃ and Ca^2 content of 120,130mg/l. 相似文献
14.
ThisworksupportedbytheScienceandTechnologyCommitteeofShandongProvince.Grant(95)50.INTRODUCTIONManyinvestigationsindicatalthatsupplementation0fsuitableseleniumleveIstolowordefidentinseleniumdietcanpreventoccurrenceofvarioustumots(Chen,l990),enhanceorganisminimneability(Wu,l992),maintainthenormalfunCtion0fheart,liv-er,lungandstomach(Schwarzetal,l957),andisgoodpareuti0nsagainstcardiovascularandcerebrovascu1arproblemsinoldpeople.Seleniumisanessentialtraeeelernentfornonnalhumanlife(Balassa… 相似文献
15.
COPPER ACCUMULATION AND TRANSPORT IN A MARINE FOOD CHAIN COMPOSED OF PLATYMONAS SUBCORDIFORMIS, BRACHIONUS PLICATILIS AND PENAEUS MONODON 总被引:2,自引:1,他引:1
mooimON~ofheaVyInetalpollutantsonmarineorganismswereextenSivelystudedguiAgenetal.,l99l,LiuFayietal.,l988,PatinS.A.,l982).bouseofthemarineansySteIncomPlexityandthevarietyofthefoodchain,pollutantSaretIanspondindiliferentwayS-Therefore,studyofthetIansPortofPonutantsinthefoodchainhasdrawnmuchattention.TherearerePortSontheaCCUInulatinnandusnsportofsorneradi0nuclidesguiFulongetal.,l984)suchasCs,Co,andZnandsometIaceelernentSsuchasV,SeandNinthernarinefoodchain(Mthemand,Ctal.,l98O;Unsal,… 相似文献
16.
lareODUcrI0NThephenomenonofbreakingwavesintheoasnoocurswheneveramomentahiyhighcrestmecheSanunstablecondition.It0ccursintendtimhy,andtheoccurrencefre-qUencydePendsonthescastate.ManystudAshaddricaniedoutontheoccurmcefre-qUencyofbrmkingwavesindeepweter.0chiandTsai(l983),LongueHiggins(l975)andVanD0mandPamn(l975)nadstheptalictonofbrmkingwavesoccurrenceindeePwater,usingabaskingcriterionforindividualwavesbasedonthewavesmpness.ThecriterioncanbeexpmeedintennSofthewaVehdghtHandperiodTasH>PgT'(… 相似文献
17.
When cultured under certain environmental coriditions (25℃, light intensity 80 μmol/m~2 ·s, LD12/12, in enriched seawater medium with 7 × 10~(-4)mol/L NO_3,-N, 1.56× 10~(-4)mol/L, PO_4-P and supplementsof other elements like Mn, Fe, I, etc.), mate and female gametophytes of U pinnatifida keptgrowing vegetatively and propagated fast at average daily fresh weight increase rate of about 20%. Theempirical formula G_m=G_o. 3~m was established to estimate the output of vegeative gametophytes. Vigorousvegetative gametophyte cells began to form reproductive structures (oogonium and spermatangium, whenthe tmperature was lower than 25℃ and other environmental factors wrre kept optimal. The sufficientsupply of gametophyte cells provided enough seeds for raising Undaria sporelings on prodiction scale.Controlled cross-breeding experiments using selcted male and female gametophyte clones which increasetheir cell number by mitosis instead of meiosis were also carried out in vitro. Juvenile sporophytes fromthe cro 相似文献
18.
ImODUcnONThemacronutrientShitrogen,phosphorus,andsiliconhaveoftenboconsidedtodritthegroWthrateofmarinephytoplankton.RamtstudAsreveatalthattraeernetalAncronutrientSmaybeofsignilicanceintheerelogyofphytoplankton(RueterandUnsworth,l99l,Brandetal.,1983,HatheonandMore,l986).IronisacomPonentofmanyalgaeproteinsparticularlytwortantforbiosynthesisofchiorophyllandeleCtrntIansportrmCtionsofrespthetionandphotosynthesis,andisCrUdalfornitrogenmetaboljsmdriusehemeandiron-stilfUrcomPoundsarethecofact… 相似文献
19.
lareODUcrIONThetotalcarbondi0xideisandriportantparametrforestirnatingthespatiotem0ralinorganiccarbontransport,andanthropogeniccarb0ndi0xideincreasesintheoonn.Ap~coulomericednique(MethodG0fASTMD5l3-82)formeasuringDICinanwaterdevelopedbyJohnsonetal.(l985)istheshipkoardmehodchosenfortheglobeocanicinofganiccarb0nsurveyt0bemadeinconjunCtionwiththeW0riddrinCirmlationExperirnentWorklHydrographicProgram(WOCEWHP)andtheJointGobal~nFluxStudy(JGOFS)program(Catherine,G.etal.,l993).Thecruxof… 相似文献
20.
The effects of recombinant eel growth hormone (reGH).methyltestosterone (MT)and L-thyroxine (T4)on the growth of red sea bream. Pagrosomus major.were investigated.Administration of reGH to fry by immersion at 2 mg 1 for 2 hevery 5 dsys resulted in significant increase in both weight and length.but the condition factor (CF) diminished relative to that of similarly treated controls over the 37day treatment period.Immersion in 0.1 mg:1 T4 also resulted in significant increase in both weight and length and higher survival rate of test fry compared to the controls. Immersion in MT had less effect on growth and high-dose resulted in high mortality.In the second study.injection of 2 μg reGH(gwk)caused a significant increase in the specific growth rate (SGR) of test red sea bream fingerlings relative to that of the controls during the 4-week treatment period and maintained the increasing trend over the post-treatment period (weeks 4-6).Injection of MT at a dosage of 1μg (gwk) resulted in a significant in-creas 相似文献