简介：Apotexperimentwithtworice(OrizasativaL.)genotypesdifferingininternalpotassiumuseefficiency(IKUE)wasconductedunderdifferentsodium(Na)andpotassium(K)levels.AddingNaC1ataproperlevelenhancedricevegetativegrowthandincreasedgrainyieldandIKUEunderlowpotassium.AdditionofhigherrateofNaC1hadanegativeeffectonthegrowthoftheK-efficientricegenotype,butdidnotfortheK-inefficientgenotype.Underlow-Kstress,higherNaC1decreasedIKUEoftheK-efficientricegenotypebutincreasedIKUEfortheK-inefficientgenotype.Attilleringstageandunderlow-Kstress,addingNaClincreasedKandNacontentsanddecreasedtheratioofK/Naforbothgenotypes.Atharvestingstageunderlow-Kstress,addingNaG1increasedKandNacontentsandK/NaratiofortheK-efficientgenotypebutdecreasedtheK/NaratiofortheK-inefficientgenotype.TheaccumulatedNawasmostlydepositedintherootsandsheaths.Attilleringstage,theKandNacontentsandtheK/Naratiosindifferentpartsforbothgenotypesdecreasedinthefollowingsequence:K+insheaths＞K+inblades＞K+inroots;Na+inroots＞Na+insheaths＞Na+inblades;andK/Nainsheaths》K/Nainroots.TheK-efficientgenotypehadalowerK/NaratioinrootsandsheathsthantheK-inefficientgenotypeunderlow-Kstress.Atharvestingstage,KandNacontentsingrainswerenotaffected,whereasK/NaratiointhericestrawswasincreasedfortheK-efficientgenotypebutdecreasedfortheK-inefficientgenotypebyNaaddition.However,thiswasnotthecaseunderKsufficientcondition.

简介：K-phillipsite用一个热水的方法被准备。可溶的玻璃和钠铝酸盐当一个器官的模板不在时被用作原料。关于K+离子的调查在房间温度被进行在海水样品和混合K+Na+答案的选择系数决定离子交换能力。样品被X光检查衍射(XRD)描绘，扫描电子显微镜学(SEM)，和精力分散光谱学(版本)。K+离子交换能力是在海水的51mg/g，选择系数在混合K+Na+答案是75.1。样品为K+有选择偏爱，并且能因此被用来有选择地从海水提取钾。由Si，艾尔，K，Na，和O组成的样品展出跨like形状并且是典型K-phillipsite结构。

简介：

简介：钾和磷酸盐被酸水解作用过程在低温度提取分解联系的磷和钾矿石的一种新类型。影响溶解率的主要因素被调查，例如磨上好，硫磺的酸的数量和氟化物盐，反应时间和温度，等等。同时，可溶的钾和磷酸盐的形成上的各种各样的因素的效果也被讨论。反应产品和残余被X光检查衍射(XRD)决定，扫描电子显微镜(SEM)分析和其它工具。结果证明分别地，钾和磷的溶解率在95.64wt%lessthan的一种谷物尺寸的条件下面是70wt%和93.7wt%0.074公里，9.78gg-1硫磺的酸，0.5gg-1铵氟化物，160桴???瑳畲瑣牵獥椠?慭湩慴湩摥映牯戠瑯??愠摮吠?湩楣敤瑮瀠汯牡穩瑡潩?愠摮映牯愠杮敬?景椠据摩吗？？

简介：Potassiumα-andβ-trivanadoenneatungstogermanateswerepreparedandcharacterizedbymeansofelementalanalysis,IR,51Vand183WNMRspectraandpolarography.Thesinglecrystalstructureofa-isomerwasdetermined.ThefinalRis0.083.TheresultsshowthattwopreparedheteropolyanionshaveKegginstructure,anda-isomerbelongstoA-typeandhasstrongeroxidizingabilitythanβ-isomer.

简介：GypsumcrystallizationalongwiththesimultaneousregenerationofKClwasinvestigatedbythereactionofCaCl2solutionwithK2SO4.WelldevelopedsheetstructuregypsumcrystalswereproducedwhenK2SO4solutionwasaddedintotheCaCl2solutionbyslowtitrationorinmultiplestagesover2-8hfollowedby2hequilibration.InordertoregenerateKClsolutionasconcentratedaspossible,K2SO4solidwasaddedintothegivenCaCl2solutioninsteadofK2SO4solution,obtaininggypsumcrystalswithalmostthesamequalitybymultistageadditionwith[SO42-]/[Ca2+]molarrationolargerthan0.8.However,impurityofK2SO4·CaSO4·H2OwasdetectedbyXRDandwasfurtherconfirmedbySEM-EDSintheproducedcrystalswhenthe[SO42-]/[Ca2+]ratioincreasedto1.1.ItisprovedthatappearanceofthedoublesulfateisattributedtotherelativelyhighconcentrationofK2SO4.So,itisessentialtoproperlycontrolthe[SO42-]/[Ca2+]ratioandmakesure[Ca2+]inexcesstosuppressthesolubilityofCaSO4evenattheexpenseoflowcalciumremovalrate.

简介：同时的多元素抽取全球一直在增加改进测试质量和效率的土壤实验室。这研究寻求了为可得到的土壤的同时的抽取调查Mehlich-1，Mehlich-3，和树脂方法的适用性象为庄稼在滋养的建议上使用变换方程的效果一样的P，K，Ca，和Mg。表层土(0–；20厘米)样品从与大量化学、物理、矿物学的性质在南部的巴西为庄稼生产使用的最代表性的土壤类型被拿。土壤P，K，Ca，和Mg同时用1.0摩尔L−被提取；1KCl，Mehlich-1和Mehlich-3答案，和膜树脂。平均，与Mehlich-1方法提取的P的数量是50%比与树脂和Mehlich-3方法提取的那些低。然而，树脂方法提取了K，Ca，和Mg的最低数量。变换方程的使用是合适的，它没否定地为在南部的巴西的土壤上种的庄稼影响K建议。

简介：ObjectivesToinvestigatesafetyandeffectivityofpotassiuminpreventionofrestenosisafterPTCA.MethodsEightypatientswithPTCAwererandomizedintotwogroups:Controlgroup(GroupⅡn=40)withconventionaltherapy;Treatmentgroup(GroupⅠn=40)withconventionaltherapyplusoralpotassium(Slow-K1.2g,q8h,given3daysbeforePTCAandcontinuedtotheendofsub-study).Observationindecesoftwogroupswerecomparedinfollow-up.ResultsSeventy-sevenpatientswerefollowed-up(39ingroupⅠ,38ingroupⅡ)Allbloodindices(includingfat,sugar,uricacid,cretonne,Na+,Cl-,Ca2+,Mg2+)exceptbloodpotassiuminbothgroupsweresimilar.Oralpotassiumcouldincreasebloodpotassiumlevelabout0.3mmol/LingroupⅠwithoutcausinganysideeffects.SuspiciousanginapectorisandevidenceofmyocardialischemiabyETTweredevelopedingroupⅡhad14patients(28.9%)andGroupIhad7patients(17.9%);6of17patients(35.3%)ingroupⅠand11of21patients

简介：Inthisstudy,Nocolokeutecticflux,usedwidelyintheprocessofthebrazingofaluminumanditsalloy,waspreparedbythereactionbetweenAl(OH)3/KOHresolutionandHF.AseriesofKF-AlF3eutecticproductionsatvariousreactiontemperatureswereprepared.Themeltingpointsoftheproductsweremeasuredbydifferentialthermalanalysis(DTA),andthecompositeswerecharacterizedbyX-raydiffraction(XRD).TheresultssuggestthatthetemperaturecontrolisimportanttoproduceanidealfluxconsistingofK2AlF5,H2OandKAlF4,withalowmeltingpointof560℃,whichissuitableforthebrazingofaluminumanditsalloyasthealuminumfluxes.

简介：ThecomplexK3H4GeW9V3O40·8H2OcrystallizedinamonocliiniesystemwithspacegroupP2,Mr=2784.67,a=11.099（3）,b=16.452（4）,c=13.534（4）,β=108.14°,Z=2,V=2348.493,F（000）:2456,μ=239.7cm-1,De=3.932g/cm3.ThefinalR=0.083for4528non-zeroreflexions.ThestructureofanionsGeW9V3O40andGeW9O34belongstoA--type.

简介：Themechanismofcesiumexchangeonpotassiumtitaniumhexacyanoferrate(KTiFC)isdescribedinthispaper.Thedependenceoftheexchangerateontemperature,particlegranulesize,andshakingfrequencyisstudied.Theresultsshowthationexchangeprocessiscontrolledbyliquidfilmdiffusioningranuleparticle.AnexchangereactionoccursmainlybetweenK^+intheexchangerandCs^+inthesolution.

简介：<正>1IntroductionSaltLake,asakindofchemicalresources,hasbeenattractedtomanyresearchers,especiallytheresourcesoflithium.Asreported,manykindsofbrinesexistintheworlddependingonthecompositionsofthebrine.Basedonthechemicalcompositionthebrinescanbeclassifiedasthetypesofchloride,carbonate,sulfate.Fordifferent

简介：ObjectivesIschemiainducedarrhythmia(ventriculartachycardia/ventricularfibrillation)isoneofthemajorcausesofdeath.Potassiumchannelschangearelikelytoberesponsiblefortheischemia-relatedarrhythmias.Cardiacpotassiumcurrentisthemajoroutwardcurrentinvolvedincardiacrepolarization.Thepropertiesofpotassiumchannelshavebeenintensivelystudied.Here,weinvestigatedtheassociationbetweenischemiainducedarrhythmiaandpotassiumchannelsgeneticvariations.Methods23patientswithventriculartachycardia/ventricularfibrillationinducedbyischemiawereselectedasobjects.5MLperipheralbloodweretakenfromeachperson,fromwhichDNAwasextractedus-ingastandardenzymaticphenol-chloroformmethod.Candidategenes(HERG、KCNJ2、KCNQ1、Mink、Mirp1、Kir2.1、KV4.3、Kir3.1、KV1.5、Kir6.1、Kir6.2、Kir2.1)Werescreenedforpotassiumchannelsgenemutationswithdirectsequencingmethods.ResultsHere4potassiumchannelsgenemutationshavebeendiscovered.InthegenecodingfortheATP-sensitiveK~+channelssubunitKir6.2,thereisachangefromvalinetoisoleucineatthepositionof326(V326I).Attheposition448,argininesubstitutesproline(P448R)intheKC-NQ1gene.InthegeneKCNJ2twomutationshavebeenfound(P156L,Q193H).ConclusionsThisstudyimplicatedthatthereisahighrelationshipbetweenischemiainducedarrhythmiaandthemutationofpotassiumchannels.Inordertoidentifythepreciselyrelationshipthereisneedfunctionalanalysis.

简介：ObjectiveTorecordtheendocochlearpotential(EP)andcalculatepotassiumconcentration[K+]inMinipigcochleae.MethodsWeusedmulti-barreledelectrodestomeasuretheEPandthepotential,[K+].EPandpotassiumelectroderecordingweremadein9cochleaefrom5minipigstogetnormalEPvalues.ResultsTheaverageEPvalueinthecochleafromtheminipigswas77.3±14mV.Theaverage[K+]fortheminipigswas147.1±13mM.ConclusionsTheEPandpotential,[K+]inminipigsarelowerthaninthehumanandrodents.ThismaybethereasonwhyporcineABRthresholdsareslightlyhigherthanhumansandrodents.

简介：Elovich,parabolicdiffusion,powerfunctionandexponentialequationswereusedtodescribeKdesorptionkineticsof12soilsinaconstantelectricfieldofelectro-ultrafiltration(EUF),ResultsshowedthattheElovich,parabolicdiffusionandpowerfunctionequationscoulddescribeKdesorptionkineticswellowingtotheirhighcorrelationcoefficientsandlowstandarderrors;buttheexponentialequationwasnotsuitabletobeusedinthisstudyduetoitsrelativelylowcorrelationcoefficientsandrelativelyhighstandarderrors.Thisworkestablishedsuccessfullytherelationshipsbetweentheconstants(slopeorintercept)ofkineticequationsandthebarleyresponsestoKfertilizerinthemultiple-sitefieldexperimentsandK-supplyingstatusofsoilsk,theconstantsofElovich,parabolicdiffusionandpowerfunctionequationswereverysignificantlyorsignificantlycorrelatedtothesoilavailableK,relativeyieldofbarleyandKuptakeofbarleyinNPplot.ItwassuggestedthatthekineticequationconstantscouldbeusedtoestimateK-supplyingpowerofsoils.

简介：Agroupofpoly(phthalazinoneethersulfoneketone)/potassium-titanate-whisker(PPSEK/whisker)compositeswaspreparedbycoprecipitationfromsolution.Thewhiskersurfacewasmodifiedusingtitanatecouplingagentpriortoblending.Thetensile,impact,morphologyandthermalpropertiesofthemouldedcompositeswereinvestigated.Themeasurementsshowedthatthetensilestrengthandimpactstrengthofthecompositesincreasedwithincreasingwhiskerscontentupto10to20phr,thereaftertheyshowedadecreaseinthewhiskerscontentreached40phr.Atthesametime,themodulusofthecompositesincreasedwithincreasingwhiskerscontent.Scanningelectronmicroscopystudiesrevealedthatthewhiskerswithinthecompositesweredisperseduniformlybytreatedwithcouplingagent.Finally,thermogravimetricanalysisshowedthattheheatresistanceofthecompositestendedtoincreasewithincreasingwhiskercontent.Theresultswereanalysedanddiscussedintermsofestablishedmodelsofthebehaviourofshort-fiberreinforcedcomposites.

简介：TheK2Ti4O9whiskerswerechosenforthecatalystcarrier,TiO2/potassiumtitanatephotocatalystwaspreparedbySol-gelmethod.TheproductwascharacteratedbyX-raydiffractionandSEM.EDSshowsthat,themainpeckincludedTi,O,andKinpotassiumtitanatewhisker.ThemainpeakofKdisappearedandthepeaksofTi,Ostayedafterwhiskerwascovered.ItdirectedthatthesurfaceofsamplewascoveredbyTiO2.XRDshowsthatdiffractionpeakappeared,whichwascorrespondedtothepeakofanataseTiO2.Inthereactiondeviceofphotochemistry,usingmiddle-pressuremercurylampasillumination,rhodamineBassimulantpollutant,thephotocatalyticperformanceofTiO2/potassiumtitanatewasstudied.Underthesameconditions,thelowerpH,thelargerilluminance,thehighertemperature,thegreateraerationquantumandthelowerinitialconcentrationofrhodamineB,thehigherdecolorationratewasgot.Underourexperimentconditions:pH6,theilluminanceof250W,thetemperatureof313K,andtheaerationquantumof2.0L/min.WhentheconcentrationofrhodamineBwas8mg/LThephotocatalystofTiO2/potassiumtitanatewas0.01g/L.ThedecolorationrateofTiO2/potassiumtitanatedealtwiththerhodamineBreachover95%in160min,andcomparewithTiO2,thedecolorationrateofrhodamineBwasimproved0.50~1.91multiple.TiO2/potassiumtitanatecanbeusedtotreatmentofdyewastewater.

简介：

简介：Elovich,two-constant,parabolicdiffusion,exponential,second-order,first-orderandzero-orderequationswereusedtodescribethekineticcharacteristicsofpotassiumdesorptionfromsixpaddysoilsofZhejiangProvinceinaconstantelectricfield(44.4V/cm)ofEUF.Resultsshowedthatthesecond-orderandElovichequationscoulddescribethepotassiumdesorptionkineticsbest,asevidencedbythehighestcorrelationcoefficients(r)andtheloweststandarderrors(SE).Thefirst-order,two-constantandparabolicdiffusionequationsalsodescribedtheKdesorptionkineticswell,asshowedbytherelativelyhighcorrelationcoefficientsandrelativelylowstandarderrors.Thezero-orderequationdidnotdescribetheKdesorptionsatisfactorilywitharelativelylowcorrelationcoefficientandrelativelyhighstandarderror.However,theexponentialequationcouldnotbeusedtodescribetheKdesorptionkinetics,duetothelowestcorrelationcoefficientandthehigheststandarderror.

简介：这研究在不同PBMP招募下面在忍受钾的矿物质粉末(PBMP)在K上分析蚯蚓的biotransformation。PBMP(10%～60%集体部分)和腐烂的奶牛粪的混合物是被使用为引起蚯蚓在土壤在PBMP上学习蚯蚓的释放钾的能力喂。包含20%和30%PBMP的混合导致了蚯蚓的好生长以及钾的更高的变换率。因此，矿物质粉末的最佳招募是20%和30%。奶牛粪和PBMP的混合与奶牛粪的混合和石英粉末的相应比例相比在不同联合在PBMP上分析蚯蚓的变换率。在蚯蚓与奶牛粪和PBMP的混合被提起以后(8：2和7：3)为30，d，很快可得到的K的内容和有效K是10824.3??????？？