文獻匯報說課模版

文獻匯報說課模版目錄

Introduction

Experimental

Resultsanddiscussion

Conclusion

IntroductionChitin(poly-β-(1,4)-N-acetyl-d-glucosamine)isthesecondmostabundantnaturalbiopolymeraftercelluloseandabasicstructuralcomponentoffungiandyeastcellwalls,aswellasofnumerousinvertebrates.自然界中含量僅次于纖維素的一種天然高聚物Thechitin-basedscaffoldsrecentlyfoundbyourgroupsinmarinespongesarethree-dimensionalnetworksoftube-likeinterconnectedfiberswithadiameterofabout100μminthecaseofAplysinaaerophoba.支架是通過直徑約100μm的管狀纖維連接形成的三維網(wǎng)絡(luò)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.（甲基的相對強度為103%）Theextractedfibersconsistofconcentricallyarrangedandlooselypackedtubularstructureswithhollowspacesinbetween.（由松散的同心排列的管狀結(jié)構(gòu)組成）

Chitinnetworksdriedwerethusnotusefulforadsorptionexperimentsanymore.Freeze-driedchitinmaintaineditsthreedimensionalshape.Thespecificsurfaceoffreeze-driedsleswas4m2/g.However,uranyladsorptiondidnotyieldreproducibleresultsforfreeze-driedspongechitin.Thesurfaceareavaluemightbehigherinhydratedchitin.（水合甲殼素的比表面積值可能更高）ThehydratedspongechitinfromA.aerophobastillcontainedapprox.90wt%water.Itislikelythatasignificantpartofthewaterisstoredinthespaceswithinthefibers.（水是存儲在在纖維空間的一個重要組成部分）Chitinnetworksfrommarinespongeswereshowntobepromisingmaterialsforthepurificationofwaterfromuraniumcontamination.Spongechitineffectivelysorbsuranyl.In