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简介：ToinvestigatedifferencesinphysiologicalcharacteristicsofgrowthandphysiologicalbasisofhighgrowthvigorinthefirstgenerationofPopulusdeltoideswhicharefromdifferentgrowthvigorclones,herewechosetwogroupsofseedlingswithdifferentgrowthvigor:high（A）andlow（B）.Indexesofphenotypeandphysiologyweresuccessivelymeasuredtostudythegrowth,photosynthesisandnutrientabsorption.Thereweresignificantorverysignificantdifferencesindrymassofroot,stem,leafandthetotalbiomassbetweenAandB.Drymatterofrootshadthesmallestproportionindifferentcomponents,andthelargestproportionwassteminA,whiletheleafhadthelargestproportioninB.ChangesingrowthandphysiologicalcharacteristicsshowedacertainregularityduringJunetoSeptember.AllclonesgrewthemostrapidlyandphysiologicalcharacteristicsvariedthemostsignificantlyinJuly.Correlationanalysisshowedthatseedlingheightandgrounddiameterwerebothsignificantlycorrelatedtoleafarea,nightrespirationrate,NH4-uptakerateandthetotalphotosyntheticrate（R>0.826,P<0.05）,suggestingthattheseedlinggrowthwasmainlyaffectedbytheirowntotalphotosyntheticcapacity,nutrientabsorptionandnightrespirationconsumption.Ingeneral,AwassuperiortoBinallthesefactors,whichconstructphysiologicalbasisofthehighgrowthvigor.

简介：Theeffectofnitrate(NO3-)onrice(OryzasativaL.)growthaswellasNabsorptionandassimilationduringdifferentgrowthstageswasexaminedusingthreetypicalricecultivars.Dryweight,yield,Nuptake,nitratereductaseactivity(NRA)inleaves,andglutaminesynthetaseactivity(GSA)inrootsandleavesduringtheirentiregrowthperiods,aswellasthekineticparametersofammonium(NH4+)uptakeattheseedlingstage,weremeasuredwithsolutioncultureexperiments.ResultsindicatedthatadditionofNH4+-NandNO3--Nataratioof75:25(NH4++NO3-treatment)whencomparedwiththatofNH4+-Nalone(NH4+treatment)increasedthedryweightof'Nanguang'cultivarby30%and'Yunjing38'cultivarby31%,andalsoincreasedtheirgrainyieldby21%and17%,respectively.Forthefourgrowthstages,thetotalNaccumulationinplantsincreasedbyanaverageof36%for'Nanguang'and31%for'Yunjing38',whereastheincreasingeffectofNO3-inthe'4007'cultivarwasonlyfoundattheseedlingstage.IntheNH4++NO3-treatmentcomparedtotheNH4+treatment,NRAintheleavesincreasedby2.09folds,andGSAincreasedby92%intherootsand52%intheleavesofthethreecultivars.NO3-supplyincreasedthemaximumuptakerate(Vmax)inthe'Nanguang'and'Yunjing38'cultivars,reflectingthattheNO3-itself,nottheincreasingNconcentration,increasedtheuptakerateofNH4+byrice.TherewasnoeffectontheapparentMichaelis-Mentenconstant(Km)ofthethreecultivars.Thus,somereplacementofNH4+withNO3-couldgreatlyimprovethegrowthofriceplants,mainlyonaccountoftheincreaseduptakeofNH4+promotedbyNO3-,andfuturestudiesshouldfocusonthemolecularmechanismoftheincreaseduptakeofNH4+byNO3-.

简介：Osteoblastsofratculturedinvitrowerestimulatedwithpulsed50Hzelectromagneticfieldandbasicfibroblastgrowthfactor(bFGF).TheMTTmethod,flowcytometryandhistochemistrystainingwereusedtodetectcellproliferation,cellcycleandalkalinephosphatase.Theresultsindicated:afterstimulatedby1mTelectromagneticfield,thecellsaremoreabundant,havemoreSphasepercentages,2mTelectromagneticfieldhavenoevidenteffectoncells'growth;comparedwithelectromagneticfield,thecellsstimulatedbybFGFaremoreabundantandhavelargerSphaseratios.ElectromagneticfieldandbFGFhavenoeffectoncells,alkalinephosphatase.Therefore,weconcludedthatelectromagneticfieldcanenhanceosteoblastsgrowthlikesomegrowthfactorsuchasbasicfibroblastgrowthfactor,andtheosteoblasts',characteristicswasnotchanged.

简介：Theyear2003isthefirstyearofimplementingthespiritof16thPartyCongressofCPCinanall—roundway.OntheReportoftheEconomicForecastDepartmentofStateInformationCenter,acceleratingthegrowthofconsumptionisofvitalimportancetostimulatingthedomesticdemand,soastoattaintheobjectiveofbuildingawell-offsocietyinanall-roundway.Therapid

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简介：RE-containingfertilizer,developedbytheStateAgriculturalAssociationincollaborationwitharesearchgroupofBeijingNon-FerrousMetalResearchIns-titute,hasbornefruitsinChina’sagri-culture.Theeffectivenessofthisfer-tilizer,calledNongle,isstriking.In1986,farmersinSouthChina’sGuangxiZhuangAutonomousRegionused

简介：Thepurposeofthispaperistostudythedynamicalmechanismoferrorgrowthinthenumericalweatherprediction.Theerrorisdefinedinthesenseofgeneralizedenergy,simplycalledenergyerror.Fromthespectralformoftheprimi-tiveequations,wehavederivedtheevolutionequationsoferrorindetail.Theanalysesoftheseequationshaveshownthattheerrorgrowthrateisdeterminedbythetangentlinearequations.Thenonlinearadvectioncausedbytheerrorperturbationitselfcontributesnothingtotheerrorgrowthrate,andonlyredistributestheerror.Furthermore,anap-proachtocalculationoftheerrorgrowthratehasbeendeveloped,whichcanalsobeusedtostudythelocalinstabilityoftime-independentbasicstateaswellastime-dependencebasicstate.Thisapproachisappliedtowell-knownLorenz’ssystem,andtheresultsareindicativeofthecorrectnessandsignificanceofthetheoreticalanalyses.

简介：Firegrowthmodelcanpredictfirebehavior,whichcanguidefirefightingactivitiesandassessesfiremanagementpolicies.Thispaperanalyzedthemainfactorsaffectingfiresimulation,andsummariedthecurrentgrowthmodelsincludingempirical,semi-empiricalandphysicalmodels.Thewidelyusedfiregrowthsimulationsoftwareswereoutlinedinthepaper,whichincludePrometheus,BehavePlus,Farsite,etc.Finally,thepaperdiscussedthelimitationsoffiregrowthmodelsandtheirfuturedevelopment.

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简介：Byusingnutritionaldiagnosisofcitrusleavesanddeterminingsoilmicronutrients,therelationshipbetweensoilmicronutrientsandcitrusgrowthinsouthernChinahasbeenstudied.Studiesshowedthattherewasasignificantpositivecorrelationbetweenavailablemicronutrients(suchasZn,Mo,Cu)inthesoilandthecorrespondingnutrientsincitrusleaves.Thus,onecanroughlylearnofthesufficiencyordeficiencyofcertainnutrientsinsoilsbyanalyzingcitrusleaves.RationalsprayofZnBorMofertilizernotonlyimprovedcitrusyieldsbutalsoincreasedthetotalsugarofSatsumamandarinandofXinhuiorangeby2.9and17.2%respectivelycomparedwiththecontrol.SprayingMofertilizerincreasedthevitaminCcontentofSatsumamandarinjuiceby4.7%-8.4%,maturatedfruits7-10daysearlierandgavethepeelabrightercolor.TheultramicroscopiccharacteristicsofZn-deficientcitrusleaveswereinvestigatedunderanelectronmicroscope.ResultsshowedthattheZn-deficientleafcellwascharacterizedmainlybypoorcytoplasm,endoplasmicreticulaandribosomesandbybigstarchgrainsinthechloroplast.AsaresultofsprayingZnfertilizerthestructureofthecellreturnedtonormal,thecytoplasmbecamerichandtheamountofchloroplastincreased.Therealsoappearedagreatdealofmultiformendoplasmicreticula,thuspromotingthephotosynthesisofZn-deficientplants.Thisprovidesacytologico-theoreticalbasisforfertilizationofhigh-yieldingcitrustrees.

简介：Basedonthegivenreactionconditionandmedium,thegrowthofmicro-andnanocrystalscanbedividedintofourtypes,growthinsolutionatnormalpressure,hydrothermalgrowth,solvothermalgrowth,andmolten-saltgrowth.Whenthewaterororganicsolventasthereactionmedium,surfactant,suchassodiumdodecylbenzenesulfonate,canbeaddedtoregulatethe

简介：LetP(z)beapolynomialofdegreenwhichdoesnotvanishin|z|

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简介：AerobicricetechnologyisstillnewinMalaysia,andinformationregardingMARDIAerob1(MA1),thefirstlocalaerobicricevariety,isstilllacking.Therefore,comparativestudieswerecarriedouttodeterminethephysiologicalperformanceofaerobicricevarietyMA1andlowlandricevarietyMR253underwaterstressgivenatthepanicleinitiation,floweringandripeningstages.Thisexperimentwasarrangedinarandomizedcompleteblockdesign.Stomatalconductance(gs),chlorophyllafluorescence(Fv/Fm),leafrelativewatercontent(leafRWC),andsoilmoisturecontent(SMC)aswellasyieldcomponentparameterssuchaspaniclenumber,grainyieldand100-grainweightweremeasured.ResultsrevealedthatgsandleafRWCforbothvarietiesdecreasedwithdepletionofSMC.ThecorrelationstudybetweenthephysiologicalparametersandSMCindicatedthatFv/Fmwasnotaffectedbywaterstress,regardlessofvarieties.Theyieldcomponents(paniclenumber,grainyieldand100-grainweight)forbothvarietiesgreatlydecreasedwhenwaterstresswasimposedatthepanicleinitiationstage.Thisstudyshowedthatthepanicleinitiationperiodwasthemostsensitivestagetowaterstressthatcontributedtoasubstantialreductioninyieldforbothvarieties.Undertheaerobiccondition(control),MR253producedhigherpaniclenumber,100-grainweightandyieldthanMA1.AlthoughMR253isbredforlowland,itiswelladaptedtoaerobiccondition.

简介：CellsregulatephospholipaseD(PLD)activityinresponsetonumerousextracellularsignals.Here,weinvestigatedtheinvolvementofPLDactivityintransforminggrowthfactor-β(TGF-β1)-mediatedgrowthinhibitionofepithelialcells.TGF-β1)-mediatedgrowthinhibitionofepithelialcells.TGF-β1inhibitsthegrowthofMDCK,Mv1Lu,andA-549cells.Inthepresenceof0.4%butanol,TGF-β1inducesanincreaseintheformationofphosphatidylbutanol,auniqueproductcatalyzedbyPLD.TGF-β1alsoinducesanincreaseinphosphatidicacid(PA)levelinA-549andMDCKcells.TGF-β1inducesanincreaseinthelevelsofDAGlabeledwith[^3H]-myristicacidinA-549andMDCKcellsbutnotinMv1Lucells.NoincreaseofDAGwasobservedincellsprelabeledwith[^3H]-arachidonicacid.ThedatapresentedsuggestthatPLDactivationisinvolvedintheTGF-β1-inducedcellgrowthinhibition.

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简介：Asynergyofcomputersimulations,analyticalformulations,andexperimentsprovesveryeffectiveinresearchanddevelopment.Usingnanorodgrowthasanexample,thisletterpresentsthesynergyofthethreecomplementaryapproachesinresearch,anddemonstratesitseffectiveness.Throughthissynergy,atheoreticalframeworkofnanorodgrowthemerges;throughthedirectionofthetheories,experimentalrealizationofsmallestwell-separatednanorodsbecomesreality;throughtherealizationofsuchnanorods,metallicglueinambientenvironmentsbecomestechnicalrealityandcommercialpossibility.