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1.
Becauseoftheirpossiblerelevancetomodelcompoundsofcationtransportacrossmembranes,differenttypesofopenchain“crown”ethermoleculeshavebeensynthesizedinordertostudytheirinteractionwithsodium ,potassiumandrareearthions[1,2 ] .Panetal.[3 ] showedthatCe3 formsa 1∶1com… 相似文献
2.
Owingtothevariationofcoordinatedmodesforcarboxylateanions ,manydifferenttypesofcrystalstructuresfortherareearthcomplexeswitharomaticacidandnitrogen containingligandswereobtained[1~ 4 ] .Theirthermaldecompositionbehaviorhadbeenre portedinpreviouspapers[5~ 8] .… 相似文献
3.
Crystalengineeringofcoordinationpoly merswithopenframeworksassembledfromor ganic metalcompoundshasbeenofgreatinter estsowingtotheirpotentialpropertiesasnovelmaterialssuchasgasadsorption[1,2 ] ,ion ex change[3] andcatalysis[4] .Theconstructionofcoordinationpolym… 相似文献
4.
Effect of Rare Earths on Composition and Activities of Rare Earth Elements Binding Glycoprotein in Tea 总被引:4,自引:0,他引:4
Teapolysacchridecomplex ,oneofthebasicmacromoleculesintea ,hasmanyphar maceuticaleffectsandiseasytodissolveinteainfusion[1] .Zhongetal .[2 ] discoveredthatthereisaREbindingpolysaccharideinleavesofteaplant (CamelliaSinensisLO .Kuntze) .Inthispaper ,thestudyontheco… 相似文献
5.
Surfacetensionofmoltensaltisoneofsignificantpropertiesinmetallurgyandmateri alsengineering .BasedonButler′sequation[1]andusingexcessthermodynamicdataofmix ing ,Tanakaetal.[2 ,3] welldevelopedseveralmodelstodeterminesurfacetensionofmoltensaltmixturesincommoni… 相似文献
6.
Effect of La-Gly on Physiological and Biochemical Characteristics of Glycine max Seedling under Pb Stress 总被引:1,自引:0,他引:1
TherehavebeensomereportsonthemechanismofthestressinjurybyPbpollutioninplant[1~ 4] .TheinjuryunderPbstresswasrelatedtothedestroyofsupermicrostructureofcellnucleuses,mitochondrion ,chlorophast[5] ,sothatthecontentsofthechlorophyllandascorbicacid[1 ,4,5] ,theactivi… 相似文献
7.
Synthesis and Structural Characterization of a Novel Two-Dimensional Heterometallic Coordination Polymer Nd_2Zn_3(EDTA)_3(H_2O)_( 11)·12H_2O 总被引:1,自引:0,他引:1
Themagneticpropertiesofheteropolynu clearcomplexescontainingboth 4fand 3dionshaveattractedconsiderableinterestssince1 985 [1] .Carboxylicacidisakindofpotentialligandforthedesignandsynthesisofthiskindofmagneticmolecularmaterials .Somecar boxylatecompoundswerep… 相似文献
8.
Thehighluminousefficiencyandbetterdisplayoftricolorphosphormaterialswasde siredforalongtime ,CeandTbco activatedluminescencematerialhaveattractedtheatten tionofscientists[1~ 5 ] .Thosematerialsarephosphate ,borate ,aluminatesofalkaline ,rareearth ,alkalineandr… 相似文献
9.
CationicradiusofrareearthelementsisclosetothatofCa2 .ItisgenerallysuggestedthatthereplacementofCa2 byTb3 inducessomealterationsofnativestructureofcalmod ulin (CaM ) [1] ,andtheresultingchangesinbiologicaleffectmaybeacauseoftoxicityofrareearths[2 ] .Wangetal[3] fo… 相似文献
10.
王龙妹 《中国稀土学报(英文版)》2001,(4)
ItisnowwellestablishedthatnumerousfactorsinfluencethereactionpathwaysinsuchacomplicatedY Ba Cu Osystem ,forin stance ,thecrystallinesizesandthereagent[1] ,thedegreeofmixingandhomo geneity[2 ,3] ,theoxygenpartialpressure[4~ 6 ] ,aswellasthereactorsizeandcrucibleshap… 相似文献
11.
Perovskite typeoxides (generalformulaABO3 )havebeenattractingmuchattentionformorethantwodecadesduetotheirpotentialcommercialapplicationsascatalystsforvariousreactions :oxidationofCO[1~ 3 ] andlighthy drocarbons[4~ 7] ,combustionofnaturalgasorCH4 [8~ 1 1 ] (tocontrolN… 相似文献
12.
Recently ,therehasbeenconsiderablein terestinlanthanide(Ⅲ )hexacyanoferratesandtheanalogouscobalt(Ⅲ )aswellaschromium(Ⅲ )complexesbecauseoftheirpotentialascatalytic ,semiconductive ,andmagneticmate rials[1~ 4] .Forexample ,magneticstudiesonaseriesofthree dimensio… 相似文献
13.
Luminescentlanthanidecomplexeshavebeenintensivelystudiedfortheirwideapplica tionsinphoto devicesandfluoro analysis ,es peciallyintheuseasluminescentlabelsinflu oro immunoassayfield[1] .Sincetheback groundluminescenceofbiologicalmaterialsisusuallyshort lived… 相似文献
14.
Structure and Luminescence Properties of Eu~(3+) Doped SiO_2 Glass Synthesized by Sol-Gel Process 总被引:2,自引:0,他引:2
Amonglanthanideions ,Eu3 + ionposs esesgoodluminescentcharacteristics ,highcolorpurityandhighquantumefficiency .Eu3 + isoneofthecentralionsfirstselectedforthepreparationofrareearthionsdopedlumi nescentmaterials .Dafinovaetal .[1] producedEu3 + andSO2 -4 dopedtungsta… 相似文献
15.
CeO2 ormaterialscontainingCeO2 possessuniqueredoxpropertiesincatalyticprocesses[1~ 3] ,andcanimprovedispersionofactivecomponentsonthesup portsandthusenhancetheirthermalstabilityandcatalyticactivity .MoststudieshaveusedCeO2 asanadditive[4 ] andexamineditsintera… 相似文献
16.
Effect of Cerium on Seed Germination under Acid Rain Stress 总被引:5,自引:0,他引:5
Plantsharmedbytheacidicraininterres trialecosystemshasbeenreportedinmanycases[1~ 4] .Macroscopicanalysisshowsthatacidrainharmsplantstotheirgroundandun dergroundorgansandthelatterisduetotheacidificationofsoilenvironment.Itfollowsthattheacidifiedsoilaffects… 相似文献
17.
Thepoormechanicalpropertiesofcastmaterials ,especiallylowtoughness ,isamainfactorlimitingtheapplicationofprecisecastdies[1] .ThroughthemodificationofcastH1 3steelbyRE ,thedendritesegregationofCH1 3steelwasimprovedandgrainboundarycarbidewasalsoundercontrol.Acc… 相似文献
18.
Itiswellknownthatorganophorusextrac tantsdi (2 ethylhexyl ) phosphoricacid(HDEHP )and 2 ethyhexyl 2ethylhexyphos phonicacid (HEH/EHP)havebeenwidelyusedintherareearthhydrometallurgicalsepa rationprocess[1~ 5 ] .However ,thelowselectiv ityforheavylanthanides (Ln3 )andh… 相似文献
19.
Nucleicacidsplayimportantrolesinthemolecularbiology.Theenormousgrowthinthenucleicacidresearchhasresultedinaneedformethodssuit... 相似文献
20.
Inhotrollingofslab ,thetheoriesofheattrans ferandtemperaturedistributionwerewidelyrecog nizedandusedinpractice[1 4 ] .However ,thequanti tativecharacterizationoftheinterfacialheattransferandtemperaturedistributionisstillincompleteandinconsistentandinmostcas… 相似文献