Synthesis and X-ray crystal structure of a new manganese 18-metallacrown-6

0　IntroductionThemetalionsinmetallamacrocylesformedbysupramolecularself assemblycantaketrigonal,square planar,andtetrahe dralconfiguration[1 ,2 ] .Metallacrownisaspecialclassofmetalla macrocyle,theyareanalogoustocrownethersinbothstructureandfunctionexceptthatthemetalionsarenowtakingthepositionsofcoordinationatomsincrownether[3,4] .Themetallacrownswithdifferentnumberof [M—N—O]repeatunithavedifferentcavitysizes,suchas 9 MC 3[5 7] ,12 MC 4 [4,8 1 4 ] and 15 MC 5 [1 5] .Thereportedazameta…     

Characterization of MASDs of surface soils in north China and its influence on estimating dust emission

Inordertoquantitivelyevaluateeffectsofdustaerosolonradiativeforcing[1],andtounderstandtheprocessofatmosphericchemistryandbiogeochemistry[2,3],modelingthedustemissionfluxisakindoffundamentalwork.TheDPMmodel[4—6]isidealforpredictingdustemission[7—10]becauseitconsiderseffectsofsurfacefea-tures(MASDofsurfacesoil,roughnesslengthandsoilmoisture,etc)andsandblastingprocess.Italsoprovidesanexplicitphysicalmechanismthatisvalidatedbywindtunnelandfieldexperiments[7—10].Themeandiameterofsurfacesoilsi…     

Atomic-scale computer simulation for early precipitation process of Ni_(75) Al_x V_(25-x) alloy with intermediate Al composition

SincethepublicationoftheclassicalworkofChan[1] andHilliard[2 ] ,therehavebeenextensiveex perimentalandtheoreticalstudiesonthethermody namicsandkineticsofprecipitation process .Recentresearchworkhasbeenconcentratedoncomputersimulation ,mostofwhichwerereviewedbyChen[3] .Mostcomputersimulationswerecarriedoutinbinarysystems[4— 8] .However ,theternaryormulti compo sitionsystemsaremoreimportantinindustries .MechanicalpropertiesofNi Albasedsuperalloyscanbestronglyaffectedbythemorphology ,distribu …     

Linguistic granular model: design and realization

Linguisticgranularmodel[1—5]hasemergedasan interesting,attractiveandpowerfulmodelingenvi ronment.Incontrasttothosenumericallylinguistic models,linguisticgranularmodelfocusesoncreating theinstructivelinguisticgranularindataspacerather thanthenumericformation.Mostnumericallylin guisticmodelsemphasizetheiraccuracyratherthan transparency.However,someresearchersutilized conditionalfuzzyclustering(CFC)[6—8]toconstructa user drivenlinguisticmodel,inwhichtheinformation andrequirementsofuserarerepre…     

Purification and Inhibition Fungal Growthof Chitinases from Vibrio pacini

0　IntroductionChitinases (EC3.2 .1.14 )areenzymesthathydrolyzechitin ,ahomopolymerofβ 1,4linkedN acetylglucosamine .Thecompletedegradationofchitinchainsisusuallyachievedbyacom plexofenzymesactingtobreaktheinitialchainsintochitooligosac charides .Theseparateenzymesthenacttobreaktheseoligomersdownintotheircomponentmonomers.Thechitinolyticsystemex istsinawiderangeoforganisms,includingbacteria[1 ] ,fungi,higherplants[2 ] ,insects[3] ,crustaceans[4] andsomevertebrates,andplaysvariousrolesbothin…     

Hausdorff centered measure of certain linear Cantor sets

Thenotionofpackingmeasure ,introducedinRefs.[1— 3],hasbeenusedincomparisonwithHausdorffmeasuretostudytheregularityandrectifi abilityofsetsintheplane[4 ] .TheHausdorffmeasureisdefinedusingeconomicalcoversofaset,whilethepackingmeasureisdefinedviapackingwithdisjointballscenteredinthegivenset (formoredetailsseeRefs .[5— 7]) .Asasymmetryofthepackingmea sure ,theHausdorffcenteredmeasure ,definedbythecoverswithballscenteredinthegivenset,wasintro ducedinRef .[4 ].RaymondandTricot[8] verifiedthatt…     

Effect of Heat Treatment on Structures and Properties of Polyurethane Blend Ultrafiltration Membranes

IntroductionMembraneseparationisanewseparationprocessthatreplacesamajorityoftheconventionalseparationsystemsanditisnowwidelyusedinmanyindustrialareassuchasfoodandbeverage ,pulpandpaper,andtextileindustries.Polyurethane (PU )isoneofthenewmembranematerialsthathaveattractedincreasingattention[1] .K .Rzesautek[2 ] studiedtheextractionandtransportofvariousorganicdyesthroughthinether typePUmembranes.U .S .AithalandS .B .Harogoppao[3 ,4] studiedthediffusionortransportofsomeindustrialsolventsthrou…     

S——“Bolzano—Weierstrass”性质

文[1]、[2]、[3]、[4]分别讨论了S—紧性和可数S—紧性,本文则讨论一种弱于S—紧性和可数S—紧性但对于半T_1空间类来说却等价于可数S—紧性的性质.这种性质称为S—“Bolzano—Weierstrass”性质或S—列紧性质,且要求这种空间的任何无限子集都具有空间内的半聚点.     

L-Fuzzy邻近空间Ⅱ——LF邻近滤子与拓扑

本文是[5]的继续,关于L=[0,1]的Fuzzy邻近空间,近来A.K.Katsaras[3],[4],K.K.Azad[1]等人作过讨论,但由于定义中条件的局限,难于推广到一般完全分配格L上,而且呈现出若干病态结果(例如[4]命题2.1,参见本文§3).为此我们在[5]中重新给予L—Fuzzy邻近关系的定义,并证明L—fuzzy正规空间是L—fuzzy邻近空间等(见[5])。     

有关“π~*——根”结构定理的证明

L.C.A.Von.Leeuwen在[1]中将Jenkins在[4]中提出的“m—环”推广为“π~*一环”,并证明了π~*是意义下由单π环类决定的上根性质。[1]中定理4就是关于π~*—根的一个结构性定理,而[3]中定理1是它的一个直接扩展。本文举例说明,[1]中定理4的证明实际上是通不过的,并指出:当且仅当π性质满足(E)条件时,其证明才是正确的,从而给出了定理4成立的一个充分条件。 1.问题的提出     

Transferring gfp gene with ion implantation and transient expression of gfp in liliaceous pollen cells

Anewtechniqueofgenetransfermediatedbyenergeticionbeamirradiationorimplantationwasde velopedinrecentyears .Stokeretal.[1] foundthatthesusceptibilityofcricetidaeembryocellstoaden ovirustransformationwassignificantlyimprovedbyX rayradiation .Stevensetal.[2 ] andZengetal.[3]foundthatpreliminarytransferrateofplasmidDNAcouldbeimprovedtoalargedegreebyionizingradia tion .UV[4 ] andenergeticheavyions[5] werefoundtohavesimilareffects ,whichindicatedthationizingra diationcouldmakeiteasyforextraneousDN…     

Characterization and expression of a cDNA, AmphiSDHD , encoding the amphioxus cytochrome b small subunit in mitochondrial succinate ubiquinone oxidoreductase

Succinate ubiquinone oxidoreductase ,alsoknownascomplexII ,isthesmallestenzymecomplexfunctioninginboththetricarboxylicacidcycle(TAC)andtheaerobicrespiratorychainofeukaryoticcellmitochondriaandprokaryoticcells[1] .Itiscom posedoffournuclear encoded proteins ,SDHAorflavoprotein (70kD) ,SDHBoriron sulfurprotein(2 7kD) ,SDHCorCII 3(15kD)andSDHDorCII 4 (7— 9kD)inmosteukaryotes[2 ] .Thetwoproteins ,SDHAandSDHB ,comprisethesuccinatedehydroge nase (SDH) ,anenzymeoftheTACandaperipher…     

Synthesis and Crystal Structure of New Supramolecular Adducts of[PtCl_6]~(2-) with Cucurbit [7] uril:[(H_3O)_2 [PtCl_6]_3 [C_(42)H_(42)N_(28)O_ (14)_2·H_2O

0　IntroductionCucurbit [n]urils (Qn ,Fig .1.)arecyclicoligomersofnunitsofglycolurillinkedby 2nmethylenebridgesderivedfromformaldehyde.Theypossessacharacteristicannularshape,withtwoidenticalcarbonyl fringedportals[1 ,2 ] .Themostcom moncucurbituril,Q6 ,wasreportedtoaccommodatedifferentguestssuchaswater[3] ,THF[4 6] ,xenon[7] ,pyridium[8] andp xylyenediammonium[3] ionsandsoon .ThealkyldiaminesthreadthroughtheQ6 ,andformtherotaxanestructures[9 1 3] .Metalions[1 ,3 6 ,1 4 ,1 5] andclusters[8,…     

Studies on the Synthesis and Electron Spectra of 2,6-Bis(p-Aminophenyl)Benzo[1,2-d;5,4-d'''']Bisoxazole

0　IntroductionBenzoxazolesareaveryinterestinggroupofaromatichetero cycliccompoundsbecauseoftheiropticalapplicationssuchasphotoluminescents,whiteningagents,laserdyeandfluorescentprobes[1 ,2 ] .Furthermore,thebenzoxazoleunitsareusefulforotherimportantcasessuchasintermediatesfororganicsynthesesandtherapeuticmaterials[3] .Recently ,muchresearchhasbeenfocusedonintroducinganaromaticbenzoxazoleorbenzobisoxazoleunitintononlinearopticalmaterialstoimprovethermalandphoto chemicalstabilities[4 6] .Benzob…     

Permutation Analysis of Track and Column Braiding

Introduction Trackandcolumnbraidingisanavailable3D braidingmethod[1～3],whichperformsbraidingprocessbymovingbraidingcarriersalongroworcolumndirection alternatively.LiandDing[4]examinethebraidingmethod andconcentratetheirstudyonthemovementofbraiding carriersonthebraidingplatform,onwhichthebraiding tracksarelocated.Accordingtothebraidingprinciple,a studyofbraidingprocessisactuallyastudyofthemovingpatternofyarnendsonthebraidingplatform.Intheiranotherpaper[6],thepositionsofbraidingcarriersare r…     

Exercise and Develop Students' Multiple Intelligences

[1]Armstrong,Thomas,Multiple Intelligences in the Classroom,Alexandria,VA:Association for Supervision and Curriculum Development,1994. [2]Armstrong,Thomas.In Their Own Way:Discovering and Encouraging You Child's Personal Learning Style,New York:Teacher/Putnam,1987. [3]Campbell,L.,B.Campbell,and D.Dickinson,Teaching and Learning Through Multiple Intelligences,Tucson,Ariz.:Zephyr Press,1992. [4]Betty W Robinett,Teaching English to Speakers of Other Languages,University of Minnesota Press,1980.     

Synthesis and Photophysical Properties of Novel Rod-shaped and Star Shaped Fluorescent Phosphane Derivatives

1 Results Over the past few years significant research has been directed toward the development of organic materials for potential application in molecular photonic devices[1] and the development of sensors[2].Interest in these materials is primarily due to the infinite numbers of possible molecular structures with the desired properties,by virtue of the tremendous capabilities of organic synthesis.For the development of a new fluorescent molecular sensor consisting of a recognition moiety linked to a fluorescent moiety,the choice of the fluorophore is of major importance[3] in order to ensure better sensitivity.This presentation will focus on the design,the synthesis and the photophysical investigation on new fluorophores based on phosphane oxide[4] and phosphane sulfide[5] derivatives (See Fig.1).     

Synthesis, Structure and Antitumor Activities of [Ni(dien)_2] [Ni(CN)_4] Complex

0　IntroductionPolyaminesarepresentinalllivingcells,prokaryotes,eu karyotes,plantsandanimals.Inmammaliancells,thenat uralpolyamines—putrescine ,spermidineandspermine———arefoundinmillimolarconcentrations.Polyamineshavespecificrolesinembryonicdevelopment,cellcycle,can cer,neurochemistry,aswellaspulmonaryandimmunesystemfunctions[1 5] .Ithasbeenreportedthatethylenediamine (en) ,diethylenetriamine (dien) ,andtriethylenetetraamine (trien)couldeffectivelyhydrolyzeRNA[6 ,7] .Recently ,Carotti[8…     

广义V—统计量的极限性质

在文献 [1]、[2 ]、[3]的基础上 ,将 [4]中的有关结果推广到广义V—统计量的情形 ,给出了广义V—统计量的极限性质