简介:VAPORIZATION HEAT AT NORMAL BOILING POINT AND MOLECULAR TOPOLOGY FOR PARAFFINSVAPORIZATIONHEATATNORMALBOILINGPOINTANDMOLECULA...
简介:Twonewaristolanesesquiterpenes,namely,aristolan-10-ol-9-oneandaristolan-8-en-1-one,wereisolatedfromtheredalgaLaurenciasimilis.TheirstructureswereestablishedonthebasisofvariousNMRspectroscopicanalyses,including2DNMRtechniques(1H-1HCOSY,HMQC,HMBC,andNOESY)andHR-FAB-MS.
简介:Thepolyoxometalate-imidazoleionicliquids(POM-ILs)withlowmeltingpointsat94.5and95.5°C,[Cnmim]4[Mo8O26](Cnmim=1-alkyl-3-methylimidazolium,n=12,14),havebeensuccessfullysynthesizedandcharacterizedbyDSC,single-crystalX-raydiffractionandTGA,etc.ThetwoPOM-ILshaverelativelyhighstabilitywithdecomposingtemperatureuptoabout347and344°C,respectively.FurtherphotocatalyticperformancewasmeasuredviathedegradationofrhodamineB(RB)inaqueoussolution.Theexperimentsshowthattheconversionreachedto90%after90minunderUV-lightandthedegradationefficiencydependedonpHvalue,differentdosagesandsoon.Inaddition,thecatalystscanberecycledforseveraltimeswithoutsignificantlossofactivity.
简介:STUDY ON THE RELATIONSHIP BETWEEN MELTING POINT AND ACID DENATURING ACIDITY OF DNA BY ULTRAVIOLET SPECTROMETERSTUDYONTHERELAT...
简介:Twonewsaponins3-O-β-D-glucopyranosyl(1→2)-β-D-mannopyranosylsarsasapogenin,namedtimosaponinAIV(1)and(5β,25S)-26-O-β-D-glucopyranosyl-furost-20(22)-en-3,26-diol-3-O-β-D-glucopyranosyl(1→4)glucopyranosyl(1→2)-β-D-galacopyranoside,namedtimosaponinBIV(2),wereisolatedbysilicagelcolumnchromatographyandpreparativeHPLCfromAnemarrhenaasphodeloidesBge.Theirstructureswereelucidatedbychemicalcharactersandspectroscopicanalysis.
简介:Ahighlysensitiveelectrochemiluminescence-polymerasechainreaction(ECL-PCR)methodforK-raspointmutationdetectionisdeveloped.Briefly,K-rasoncogenewasamplifiedbyaRu(bpy)32+(TBR)-labeledforwardandabiotin-labeledreverseprimer,andfollowedbydigestionwithMvaIrestrictionenzyme,whichonlycutthewild-typeampliconcontainingitscuttingsite.Thedigestedproductwasthenadsorbedtothestreptavidin-coatedmicrobeadthroughthebiotinlabelanddetectedbyECLassay.TheexperimentresultsshowedthatthedifferentgenotypescanbeclearlydiscriminatedbyECL-PCRmethod.Itisusefulinpointmutationdetection,duetoitssensitivity,safety,andsimplicity.
简介:Thefollowingdocumentationisanevaluationofthetwo-dimensionalMadelungconstantfortheNaClstructure.TheinfiniteseriesforthestructureisformultedasThefirsttermintheformulaconvergesto41n2.TheseriesafterK=2inthesecondtermisputtogetherwiththethirdtermandaconstant-4/2isleft.ThecombinationofthethirdtermandtheseriesafterK=2inthesecondtermisassumedtobe8Sn.TheconvergingseriesSncanbesolvedonacomputer.Thesevensignificantfiguresofthetwo-dimensionalMadelungconstantfortheNaClstructureisthendeterminedas1.615558.