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简介：Treesareusefultomaninthreeimportantways:theyprovidehimwithwoodandotherproducts,theygivehimshade,andtheyhelptopreventdrought(干旱)andfloods.Unfortunately,inmanypartsoftheworldmanhascutdownalargenumberoftreeseveryyear.

简介：MITEs(Miniatureinverted-repeattransposableelements)arereminiscenceofnon-autonomousDNA(classⅡ)elements,whicharedistinguishedfromothertranspos-ableelementsbytheirsmallsize,shortterminalinvertedrepeats(TIRs),highcopynumbers,genicpreference,andDNAsequenceidentityamongfamilymembers.Al-thoughMITEswerefirstdiscoveredinplantsandstillactivelyreshapinggenomes,theyhavebeenisolatedfromawiderangeofeukaryoticorganisms.MITEscanbedividedintoTourist-like,Stowaway-like,andpogo-likegroups,accordingtosimilaritiesoftheirTIRsandTSDs(targetsiteduplications).Indespiteofsev-eralmodelstoexplaintheoriginandamplificationofMITEs,theirmechanismsoftranspositionandaccumulationineukaryoticgenomesremainpoorlyunderstoodowingtoinsufficientexperimentaldata.TheuniquepropertiesofMITEshavebeenexploitedasusefulgenetictoolsforplantgenomeanalysis.UtilizationofMITEsaseffectiveandinformativegenomicmarkersandpotentialapplicationofMITEsinplantssystematic,phylogenetic,andgeneticstudiesarediscussed.

简介：Thispaperdescribesthepreparationofpolystyrylsulfonylchloride,areactiveintermediate,anditsapplicationinsynthesesoffunctionalizedpolymerswhichcanbeusedinorganicchemistryaspolymericreagents,supportsandincontrolledreleasesystems.

简介：Asetofparameterscalledrelativeorbitalelementsweredefinedtodescribetherelativemotionofthesatellitesintheformationflying.Withthehelpoftheseparameters,theeffectoftheperturbationsontherelativeorbittrajectoryandgeometricpropertiesofsatelliteformationcanbeeasilyanalyzed.First,therelativeorbitalelementsarederived,andpointedout:iftheeccentricityoftheleadingsatelliteisasmallvalue,therelativeorbittrajectoryisdeterminedbytheintersectionbetweenanellipticcylinderandaplaneintheleadingsatelliteorbitframereference;andtheparametersthatdescribetheellipticcylinderandtheplanecanbeusedtoobtaintherelativeorbittrajectoryandtherelativeorbitalelements.Second,byanalyzingtheeffectsofgravitationalperturbationsontherelativeorbitusingtherelativeorbitalelements,itisfoundthatthepropagationofarelativeorbitconsistsoftwoparts:oneisthedriftoftheellipticcylinder;andtheotheristherotationoftheplaneresultedfromtherotationofthenormaloftheplane.Meanwhile,theanalyticformulaeforthedriftandrotationratesofarelativetrajectoryundergravitationalperturbationsarepresented.Finally,therelativeorbittrajectoryandthecorrespondingchangeswereanalyzedwithrespecttotheJ2perturbation.

简介：Abstract:FortyspeciesofBasidiomycotafrom21generain15families,collectedfromLiuxiheNationalForestPark,Guangzhou,China,havevaluesforusebylocalpeople.Morethanhalfofthespeciescollectedareedible,andsome(Lactariusdeliciosus,Boletusspp.)aregatheredforcommercialconsumptioninSouthChina.Tenspecieshavemedicinalproperties,andincludeDictyophora,Ganoderma,PisolithusandScleroderma.Over60%species(26taxa)areectomycorrhizalinvolving12ediblefungi.ThemostabundantfamiliesweretheAmanitaceae,BoletaceaeandSclerodermataceae,whichformimportantectomycorrhizalassociationswithconiferousandmixedbroad-leafedtreesinthePark.Prospectiveusesofthesemacrofungiarediscussed.

简介：Bothenantiomersofdenopamineweresynthesizedusingmicrobial-chemicalapproachviabioreductionof1-(acetoxyphenyl)ketone4(R=CH2C1)and5(R=CO2Et)withfungusGeotrichumsp.G38.