简介:Abstract:Aphysiologicalactivefactor-r-oryzanolinricebranwasstudied.Ther-oryzanolwasseparatedandidentifiedbythinlayerchromatograghy(TLC),reverse-phaseHPLC,semipreparativeHPLCandelectrosprayionization/massspectrometry(ESI/MS).Itsindividualcomponents,cycloartenolferulateand24-methylenecycloartenolferulatewereobtained.Aneffectivemethodtopurifyandseparatether-oryzanolisprovided.Whichisusefulforfurtherresearchonthefuctionalclaracteristiesofr-oryzanolandforthedevelopmentofnewricebranproducts.
简介:ThispaperdealswiththestructureoftheY^Ⅲcomplexwithaminopolycarboxylicacids,synthesisandstructuraldeterminationofthecomplex(NH4)[YⅢ(edta)(H2O)3]·3H2O(edta=ethylenediaminetetraaceticacid).Thecrystalandmolecularstructuresofthe(NHO[YⅢ(edta)(H2O)3]·3H20complexhavebeendeterminedbysingle-crystalX-raystructureanalysis.Thecrystalofthecomplex(NH4)[YⅢ(edta)(H2O)3]·3H2Obelongstoorthorhombiccrystalsystemandfdd2spacegroup.Thecrystaldataareasfollows:a=1.9441(9)nm,b=3.5459(18)nm,c=1.2196(6)nm,V=8.407(7)nm3,Z=16,M~=503.25,Dc=1.590g.cm3,μ=2.844mm-1andF(000)=4160.ThefinalRandRware0.0486and0.1332for3388(I>2σ(I))uniquereflections,respectively.Thecomplexanion[YⅢ(edta)(H2O)3]hasapseudo-mono-cappedsquareantiprismaticnine-coordinatestructureinwhichthesixcoordinateatoms(twoNandfourO)arefromanedtaligandandthreewatermoleculescoordinatetothecentralYⅢiondirectly.Fromtheresultsitcanbepredictedthattheymioncanalsoformanine-coordinatecomplexwithttha(=triethylenetetraminehexaaceticacid)ligand,sotheradioactivecomplexanion[99YⅢ(Httha)]2-cansupplyafreecarboxylgroup(-CH2COOH)beingusedformolecularembellishmenttoformtheTDDSforthetreatmentofcancers.
简介: 在三角函数中y=Asin(ωx+φ)正弦型函数有着重要的作用和地位,其中ω、φ是两个极其重要的量,需要好好地总结归类分析以便于掌握.通过平移伸缩变换、三角函数的图象和性质或三角形等可灵活解决这些问题.……
简介:Themicrostructuresofloadedorganicphasesofthreequaternaryaminesolventextractionsystemsforgold,whichwereN263-xylene,N263-tributylphosphate(TBP)-dodecaneandN263-2-ethylhexanol(isooctanol)-dodecane(N263-trialkylmethylammoniumchloride;alkyl=C8-C10),werestudiedbyFouriertransforminfrared(FTIR)spectroscopyandextendedX-rayabso\rptionfinestructure(EXAFS)spectroscopy.AccordingtotheEXAFSresults,itwasfoundthatthegoldcoordinationenvironmentwasthesamebeforeandafterextraction.However,theC≡NstretchingvibrationsofAu(CN)2-werealsofoundtobedifferent,InordertoexplainthedifferencesintheIRcharacteristicsofC≡Ninthethreeextractionsystems,threemicrostructuremodelsareproposed.FortheN263-xylenesystem,themodelisasimpleionpair.Fortheothertwosystemswithamodifier(TBPandisooctanol),themodelsaretwosupramolecularstructuesbasedonhydrogenbondingbetweenthemodifierandAu(CN)2^-.SomerelatedworksuchasonthehydrationofacetonitrileandthefinestructureofC≡NinsolidKAu(CN)2wasalsoperformedinordertoofferadditionalsupportingevidenceforthereliabilityoftheproposedmodels.
简介:摘要目的研究患者接受90Y树脂微球选择性内放射治疗(SIRT)后48 h内所排泄尿液中90Y的放射性活度,为术后患者排泄物的管理提供建议。方法收集3名患者在术后0~24 h和24~48 h两个时间段内排泄的尿液,并对尿液中的90Y放射性活度进行检测和分析。结果3名患者术后0~24 h和24~48 h尿液中的90Y放射性活度排泄量分别为(1 266±258)kBq/GBq和(140±106)kBq/GBq,90Y放射性活度浓度分别为(640±113)kBq/L和(53±12)kBq/L。结论90Y树脂微球治疗术后肝癌患者0~24 h排泄尿液中的90Y放射性活度比24~48 h高。术后患者可通过增加排泄尿量的方式来加速排出体内游离的90Y;患者住院期间的排泄物应按照HJ 1188-2020《核医学辐射防护与安全要求》的要求处理。