文献汇报说课模版

文献汇报说课模版目录

Introduction

Experimental

Resultsanddiscussion

Conclusion

IntroductionChitin(poly-β-(1,4)-N-acetyl-d-glucosamine)isthesecondmostabundantnaturalbiopolymeraftercelluloseandabasicstructuralcomponentoffungiandyeastcellwalls,aswellasofnumerousinvertebrates.自然界中含量仅次于纤维素的一种天然高聚物Thechitin-basedscaffoldsrecentlyfoundbyourgroupsinmarinespongesarethree-dimensionalnetworksoftube-likeinterconnectedfiberswithadiameterofabout100μminthecaseofAplysinaaerophoba.支架是通过直径约100μm的管状纤维连接形成的三维网络Theadsorptionbehaviorwastestedinlifelikeconcentrationranges.Wefurtherattemptedtodesorbtheuranylinordertorecoverthespongechitinandmakeitreusable.Thekineticsoftheadsorptionprocesswereexaminedtodeterminethetimeneededfortheadsorption.Theinteractionmechanismsbetweenchitinanduranylwereexaminedwithsolid-stateNMR,infrared,Ramanaswellastime-resolvedlaserfluorescencespectroscopy.ExperimentalMarinespongeAplysinaaerophoba

：collectedintheAdriaticSea(KotorBay,Montenegro)anddriedonair.NaOHplatelets：purchasedfromGrüssing(99%).Concentratedaceticacid：purchasedfromVWR(HPLCgrade).α-Chitin：purchasedfromCarlRothGmbH(depure).NaClO4·2H2O,NaOHandHCl：purchasedfromMerck(analyticalgrade).ConcentratedHNO3

：purchasedfromCarlRothGmbH(analyticalgrade)anddistilledbeforeusage.A1000mg/lrhodiumsolution

：purchasedfromMerck(ICP-MSstandard).UO2(ClO4)2

：0.102MIonicstrength：0.5M(NaClO4)

ResultsanddiscussionThespongechitiniscompletelyacetylatedwithinthelimitsofexperimentalerror.（甲基的相对强度为103%）Theextractedfibersconsistofconcentricallyarrangedandlooselypackedtubularstructureswithhollowspacesinbetween.（由松散的同心排列的管状结构组成）

Chitinnetworksdriedwerethusnotusefulforadsorptionexperimentsanymore.Freeze-driedchitinmaintaineditsthreedimensionalshape.Thespecificsurfaceoffreeze-driedsleswas4m2/g.However,uranyladsorptiondidnotyieldreproducibleresultsforfreeze-driedspongechitin.Thesurfaceareavaluemightbehigherinhydratedchitin.（水合甲壳素的比表面积值可能更高）ThehydratedspongechitinfromA.aerophobastillcontainedapprox.90wt%water.Itislikelythatasignificantpartofthewaterisstoredinthespaceswithinthefibers.（水是存储在在纤维空间的一个重要组成部分）Chitinnetworksfrommarinespongeswereshowntobepromisingmaterialsforthepurificationofwaterfromuraniumcontamination.Spongechitineffectivelysorbsuranyl.In