简介：YoungWistarratsweredividedintosixgroups,theexperimentalgroupsweregivenLa(NO3)3atdoseof20,10,2,0.2,0.1mg*kg-1andthecontrolgroupwasgivenphysiologicalsalinerespectivelyforsixmonths.Theanimalswereweighedandtheratiosofthelivertobodyweightwerecounted.Pathologicalchangesofliverwereobservedbylightmicroscopeandtransmissionelectronmicroscope.Glutamic-oxalacetictransaminase(GOT),glutamic-pyruvictransaminase(GPT),gamma-glutamyltransferase(γ-GT)andalklinephosphatase(ALP)intheserumweremeasured.Theresultsindicatethatthebodyweightofanimalsgainesslowlyinthegroupof20mg*kg-1La(NO3)3,butitgainedquicklyintheratsfedwith0.1mg*kg-1La(NO3)3.Biochemicalindexeshavenoabnormalchanges.Inthegroupof20mg*kg-1La(NO3)3,therewerelipiddropletsanddecreaseofglycogeninthehepatocytes,densermatrixofthemitochondria,deformationofthenucleiofsomehepatocytestodifferentdegreeandinfiltrationofinflammatorycellsatportalarea.ThemorethedoseofLa(NO3)3weregiventotherats,themorethenumberofbodiescontaininghighlyelectronicdensegravel-likegranulesandthesecondarylysosomeswithdensebodies.Theratsfedwith20mg*kg-1La(NO3)3forsixmonthsshowsinjuriouseffectsonthehepatocytes.

简介：ExperimentswerecarriedoutonavegetablefieldwithPekingcabbage(Brassicapekinensis(Lour.)Rupr.),cabbage(Brassicachinensisvar.OleiferaMakinoandnemoto),greencabbage(BrassicachinensisL.),spinach(SpinaciaoleraceaL.)andrape(BrassicacampestrisL.)tostudytheeffectsofNformsandNratesontheirgrowthandnitrateaccumulation.Theresultsindicatedthatapplicationofammoniumchloride,ammoniumnitrate,sodiumnitrateandureasignificantlyincreasedtheyieldsandnitrateconcentrationsofPekingcabbageandspinach.Althoughnosignificantdifferencewasfoundintheyieldsafterapplicationofthe4Nforms,nitrateNincreasednitrateaccumulationinvegetablesmuchmorethanammoniumN.ThevegetableyieldswerenotincreasedcontinuouslywithNrateincrease,andoversupplyofNreducedtheplantgrowth,leadingtoayielddecline.Thistrendwasalsotruefornitrateconcentrationsinsomevegetablesandatsomesamplingtimes.However,asawhole,thenitrateconcentrationsinvegetableswerepositivelycorrelatedwithNrates.Thus,additionofNfertilizertosoilwasthemajorcauseforincreasesinnitrateconcentrationsinvegetables.Nitrateconcentrationsweremuchhigherinroots,stemsandpetiolesthaninbladesatanyNrate.

简介：Theeffectofbicarbonate(HCO3-)onthegrowthanddevelopmentofplantsvariesbyspecies.Tobetterunderstandinorganiccarbonandnitrogenassimilationchangesofkarst-adaptableplantsunderdifferentHCO3-treatments,weconductedexperimentsonseedlingsandinvitroplantletsofOrychophragmusviolaceus(Ov).Wefoundthatthevitalphotosynthesispotential(asmeasuredbynetphotosyntheticrate,actualphotochemicalefficiencyofphotosystem-Ⅱ,photochemicalquenchingcoefficient,andtheinstantaneouscarbonisotoperatioof3-phosphoglycerate)wasconsistentunderdifferentHCO3-treatmentsofOv.Bicarbonate’slackofeffectoncarbonassimilationofOvmayberelatedtocarbonicanhydraseinOvconvertingHCO3-toH2OandCO2.Inthisway,OvcouldpreventHCO3-iontoxicityandhighpHfromharmingitsgrowthanddevelopmentunderHCO3-stress.ThisstudyalsofoundthathighHCO3-concentrationscouldpromotenitrogenassimilationandutilizationofOvthroughchangesinrelatedindexes(foliarnitrogenisotopefractionationratio,stablenitrogenisotopeassimilationratio,foliarstablenitrogenisotopefractionation,nitratenitrogenutilizationefficiency,andnitrateutilizationshare)underdifferentHCO3-treatments.BicarbonatehasdifferenteffectsonphotosynthesisandoninorganicnitrogenassimilationofOv,whichmaybeconnectedtophotosynthesisprovidingelectronsfornitrate/nitritereductionthroughthephotosyntheticchain.

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

简介：Aconductometricnitratebiosensorbasedonmethylviologen/Nafion/nitratereductase(NR)interdigitatedelectrodeforheavymetaldeterminationwasproposed.TheactivityofNR(EC1.6.6.2)fromAspergillusniger(A.niger)wasassayedasafunctionofmetalconcentrationinthepresenceofCu2+,Zn2+,Cd2+andPb2+.Parametersinfluencingtheperformanceofthebiosensorwereoptimizedfortheapplicationofitintheinhibitiondeterminationofheavymetalions.DetectionlimitsforCu2+,Zn2+,Cd2+andPb2+wereabout0.05,0.5,0.1and1.0μmol/L,respectively.TheresultsshowthatNRactivitycouldnotberegainedafterexposuretoCu2+,butcouldbepartiallyrecoveredafterexposuretoZn2+,Pb2+andCd2+.

简介：因素影响对流球的硝酸盐喷雾器形成用热力学的平衡模型ISORROPIA和压缩煤气阶段的化学模型通过很多敏感研究被调查。结果显示硝酸盐喷雾器的平衡集中与太阳的天顶角度，空气温度，相对湿度，起始的SO2集中，起始的NO2集中和起始的NH3集中变化。NH3集中和太阳的天顶角度起最重要的作用，由相对湿度和NO2集中列在后面。看起来在硝酸盐喷雾器和这四个因素之间的关系，以及空气温度，由于联合效果强壮、高度非线性。硝酸盐喷雾器上的SO2集中的影响在线性附近、弱。

简介：Nitratereductaseactivity(NRA)indifferentplantorgansandleavesindifferentpositionsofCamptothecaacuminataseedlingswasdeterminedbyanInvivoassay,thediurnalvariationrhythmofNRAinleavesofdifferentpositionswasobserved,andthecorrelationsbetweenleafNRA,leafareaandlaminamassperunitarea(LMA)werealsoexamined.TheresultsshowedthatNRAintheleafwassignificantlyhighest,comparedwiththatinotherorganssuchasroots,stemsandleaves.Inthisexperiment,the10leaveswereselectedfromtheapextothebaseoftheseedlingsinorder.ThedifferentNRAoccurredobviouslyinleavesofdifferentpositionsofC.acuminataseedlingsfromtheapextothebase,andNRAwashigherinthe4th-6thleaves.ThediurnalchangerhythmofleafNRAshowedaonepeakcurve,andmaximumNRAvalueappearedataboutmidday(at12:30orso).NoobviouscorrelationsbetweenNRAandleafareaorlaminamassperunitareawereobserved.ThisstudyofferedscientificfoundationforthefurtherresearchonnitrogenmetabolismofC.acuminata.

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：新奇磁性的阴离子交换树脂NDM-1与ammonolysis和alkylating代理人通过暂停聚合然后functionalized被准备。它为硝酸盐的选择移动的申请与MIEX比较被执行?。结果证明NDM-1比MIEX在硝酸盐移动完成了更高的效率吗？做了，与或没有归功于到它交换地点上的更长的烷基链的竞争阴离子SO42的存在。由于植入的-Fe2O3与容易的分离的优点结合了，磁性的阴离子交换树脂NDM-1被认为比MIEX优异吗？为在实际申请的硝酸盐移动。

简介：基于铵硝酸盐的关系的研究(一)爆炸和它的热稳定性，惰性的代理人被加到一因为消除爆炸特征一and以便是irrestorable。使用实验和各种各样的测试技术的大数量的结果证明热稳定性上的改进修改一是为消除爆炸特征的基本原因一。修正计划被认为有下列特征：可靠、稳定的技术，要求市场的产品，低投资和好经济回来。并且在修理时期期间，一个愿望的正常生产没被影响，并且经济、社会、环境的好处好。

简介：Longaluminafiberswith60cminlengthwerepreparedbysol-gelmethod.Thespinningsolwasobtainedbymixingaluminumnitrate,oxalicacid,andpolyvinylpyrrolidonewithamassratioof10∶3∶2.Fouriertransforminfrared(FTIR)spectra,X-raydiffraction(XRD),andscanningelectronmicroscopy(SEM)wereusedtocharacterizethepropertiesofthegelandceramicfibers.Thefiberswithuniformdiameterandsmoothsurfacewereobtainedbysinteringat1200℃for1h,andtheirmainphasewasindentifiedasα-Al2O3.

简介：ThesolventextractionofPr(Ⅲ)andSm(Ⅲ)withtrialkylphosphineoxide(Cyanex923)inchloroform,carbontetrachloride,n-octane,cyclohexane,1,2-dichloroethane,benzene,toluene,xyleneandnitrobenzenefromacidicnitratemediumwasinvestigated.Onthebasisofslopeanalysisdata,thecompositionoftheextractedspecieswasdeterminedas(M(NO3)3?2CY923),CY923referstoCyanex923.Thevaluesoftheequilibriumconstantsandtheseparationfactorswerecalculated.Theeffectofthediluentsonthemetalextracti...

简介：Elevennitratenon-utilizing(nit)mutantswererecoveredfromsixisolatesofMagnaporthegriseaculturedonMMmedia,amendedwith60g/Lpotassiumchlorate,withafrequencyof1.42°.Somebiologicalproperties,suchasgrowthrate,growthbiomass,culturalcharacters,conidialproduction,sexualreproductionability,andpathogenicitywerecomparedbetweennitmutantsandtheirparentisolates.Resultsshowedthatallthenitmutantswereresistanttochlorate.SomeimportantbiologicalpropertiessuchasthegrowthrateonYPSA,conidialproductionabilityonTPSA,pathogenicity,hadnosignificantdifferencesbetweennitmutantsandtheirparentisolates.Matingtypedidn'tchange,butperitheciaproductionabilityoffertileisolateschangedsignificantlyascomparedwiththatoftheirparentisolates.Therefore.thenitcanbeusedasageneticmarkertostudythegeneticssuchaspathogenicity,fungicideresistanceinMagnaporthegrisea.

简介：

简介：长路径的微分光吸收光谱学(LP-DOAS)技术被开发测量夜间大气的硝酸盐基(没有3)集中。一个优化检索方法，导致小剩余结构和低察觉限制，被开发不检索3。时间序列没有3集中从2006年3月17日被收集，夜间一般水准在哪儿15.8ppt珍视，被观察。介入的因素和错误也被讨论。这些结果显示DOAS技术在夜间化学之上为没有3集中并且在它的效果的学习的数量化离子提供一个必要工具。

简介：印射土壤硝酸盐氮(NO3-N)的空间分发是重要的指导氮申请以及估计沥滤进地下水的NO3-N的环境风险。我们采用了univariate和混合geostatistical方法在东北佛罗里达越过一处风景印射土壤NO3-N的空间分发。土壤样品从四深度增长被收集(030，3060，60120和120180厘米)基于土壤，土地使用和举起阶层从用成层的随机识别并且嵌套采样的147个采样地点设计。在二层是的顶的土壤NO3-N分布空间地，汽车相关并且印射使用木头正常kriging。为NO3-N预言的环境关联模型用线性、非线性的回归方法被导出，并且采用了开发NO3-N趋势地图。陆地使用和它从卫星形象导出的相关变量作为重要变量被识别用环境关联模型预言NO3-N。当木头正常kriging生产了顺利变化的地图时，从环境关联模型导出的趋势地图产生了空间地异构的地图。趋势地图与趋势模型剩余的平常的kriging预言被相结合开发回归kriging预言地图，它给了最好的NO3-N预言。因为土地使用和遥远地察觉到的数据是容易地可得到的并且有大部分，与地相比的更好的空间分辨率取样了土壤，我们的调查结果基于为风景的使用和遥远地察觉到的数据放大土壤NO3-N印射的土地建议了环境关联模型的功效。实现的方法论为在另外的风景土壤NO3-N印射是可转让的。

简介：narG基因经常为细菌的减少硝酸盐的社区分析被用作一个分子的标记。在这研究，指向narG基因的教材的一个新集合被设计并且把使中毒反应的坡度胶化电气泳动(PCR-DGGE)试金用于嵌套半的聚合酶链。新教材的潜力在直接从在中央、南部的意大利散布的五个不同试验性的地点从土壤提取的DNA上被验证。教材的特性被切除决定，扩大，并且乐队定序由DGGE解决了。种系发生的分析显示出在从学习的土壤检索的序列和narG序列之间的关联从并且-Proteobacteria。这些教材扩展了存在为在土壤的减少硝酸盐的细菌的社区的尺寸和差异上的生态的学习的分子的工具。

简介：许多aldoximes和ketoximes与艾尔(NO3)一起被改革到相应羰基混合物在在在房间温度的CH2Cl2的NaBr的催化数量的存在的3路9H2O。

简介：为了减少沥滤的硝酸盐，在土豆(茄属tuberosumL.)以后冒险收获并且改进氮化肥使用效率，一棵土豆卷心菜两倍收割系统(DCS)在Hetao被建立，诺思中国，有灌溉土地的一个干旱区域。一个二年的地实验证明在塑料林地覆盖物下面种早成熟的土豆栽培变种弄短它由14d的生长时期并且允许卷心菜的第二庄稼清除土壤剩余NO3S-N到160厘米的深度，实质地减少硝酸盐沥滤进地下水的风险。在DCS的每年全部的N举起在常规收割系统(CCS)是多于那的大约110kgha1，即，种的单音的土豆。这说明了明显的氮恢复(ANR)在DCS的16.90%26.57%的改进作为与那相比在为两年的CCS。作为结果，在在DCS的0160厘米土壤侧面的土壤剩余NO3-N在CCS是比那低的。太阳的精力使用效率和土壤使用效率实质地也与DCS被增加。

简介：Thetransportandchemicalproductionprocessesofnitrate,sulfate,andammoniumaerosolsoverEastAsiawereinvestigatedbyuseoftheModels-3CommunityMulti-scaleAirQuality(CMAQ)modelingsystemcoupledwiththeRegionalAtmosphericModelingSystem(RAMS).Fortheevaluationofthemodel'sabilityindepictingtheir3-dimensionalconcentrationdistributionsandtemporalvariations,modeledconcentrationsofnitrate,sulfate,andammoniumaerosolsarecomparedwiththeobservationsobtainedatagroundstationinJapaninMarch2001andonboardofanaircraftDC-8on18and21March2001duringtheTransportandChemicalEvolutionoverthePacific(TRACE-P)fieldcampaign.Comparisonshowsthatsimulatedvaluesofnitrate,sulfate,andammoniumaerosolsaregenerallyingoodagreementwiththeirobserveddata,andthemodelcapturesmostimportantobservedfeatures,andreproducestemporalandspatialvariationsofnitrate,sulfate,andammoniumaerosolconcentrationsreasonablywell,e.g.,thetimingandlocationsoftheconcentrationspikesofnitrate,sulfate,andammoniumaerosolsarewellreproduced,butlargediscrepanciesbetweenobservedandsimulatedvaluesarealsoclearlyseenatsomepointsandsometimesduetothecoarsegridresolutionanduncertaintiesoftheemissionsusedinthisstudy.ThiscomparisonresultsindicatethatCMAQisabletosimulatethedistributionsofnitrate,sulfate,andammoniumaerosolsandtheirrelatedspeciesinthetroposphereoverEastAsiareasonablywell.