简介:Thestarch/D,L-lactidegraftcopolymersweresynthesizedbyreactingD,L-lactidewithcornstarchinN,N-dimethylacetamide(DMAM)inthepresenceoftriethylamine(NEt3)andanhydrouslithiumchloride.TheeffectofreactiontimeandthemolarratioofD,L-lactidetoglucosestructuralunitofstarchonmonomerconversion(C%),graft(G%)andgraftefficiency(GE%)werestudied,TheC%,G%andGE%couldapproach37.3%179.7%and68.0%,respectivelywhenthemolarratioofD,L-lactidetoglucosestructuralunitofstarchis10:1andthegraftcopolymerizationwascarriedoutat80-85℃for4hrundernitrogenatmosphere.TheFouriertransformsinfra-red(FTIR)spectroscopy.differentialscanningcalorimetry(DSC)andX_raydiffraction(XRD)spectroscopywereusedinordertocharacterizethegraftcopolymers.FTIRspectrashowthatabsorptionbandat1740cm^-1confirmedtheformationofesterbond,indicatingthestarch/D,L-lactidegraftcopolymerswereproduced,theDSCcharacteristicresultsshowthemeltingtemperatureofthegraftcopolymerwereelevatedslightlyasthemolarratioofD,L-lactidetoglucosestructuralunitsofstarchincreasedandtheX-raydiffractionspectrashowthesynthesizedgraftcopolymerswereamorphous.Thedegradabilityofgraftcopolymerwastestedwiththeaidofacid,alkaliandmicrobesuchasbacillussubtilisandstaphylococcusaureus.Theresultsofwaterrsistanceshowthegraftcopolymerproducedcanbeusedasacomponentofimpermeablecoatingforcardboard.
简介:摘要:国有企业职工家属区供水、供电、供热(供气)及物业管理(统称“三供一业”)分离移交,是深化国有企业改革的一项重要任务,是剥离企业办社会职能,减轻国有企业历史负担、精干主业发展,整合资源改造提升基础设施、改善民生的重要举措。本文介绍了DL公司在供热分离移交工作中的主要做法及三点工作体会,以供参考。
简介:Anewbiodegrablehydrogelbasedonα,β-poly-aspartamidewassynthesizedbypolycondensationofDL-asparticacidand85%phosphoricacidinvacuityat180°C,andthenbyring-openingwith3-aminopropanoltogetherwithcross-linkingreactionwithethanediamimo.
简介:摘要:DL166H扁钢,在线预硬后下坑缓冷,辊底炉回火后精整检查发现侧面纵裂。裂纹断续,未延伸至端面,裂纹取料分析,有裂纹源,裂纹源有脱碳。
简介:Objective:ToexplorethepreparativemethodandstudythedegradationcharacteristicsofbonerepaircompositeofDL-polylacticacid(PDLLA)/hydroxyapatite(HA)/decalcifyingbonematrix(DBM)invitro.Methods:AnemulsionblendmethodwasdevelopedtopreparethecompositeofPDLLA/HA/DBMinweightratioofPDLLA:HA:DBM=1.5-2:1-1.5:1.Thedynamicchangesofweight,biomechanicalpropertyandpHvalueofPDLLA/HA/DBMandPDLLAinphosphatebufferedsaline(PBS,pH7.4)werestudiedrespectivelythroughdegradationtestsinvitro.Results:Withoutbeingheated,PDLLA,HAandDBMcouldbesynthesizedwiththeemulsionblendmethodasbonecompositeofPDLLA/HA/DBM,whichhadbothosteoconductiveandosteoinductiveeffects.Thediameteroftheaperturewas100-400μmandthegapratewas71.3%.Duringdegradation,thepHvalueofPDLLAsolutiondecreasedlightlywithin2weeks,butdecreasedobviouslyattheendof4weeksandthevaluewas4.0.WhilethepHvalueofPDLLA/HA/DBMkeptquitesteadyandwas6.4attheendof12weeks.TheweightofPDLLAchangedlittlewithin4weeks,thenchangedobviouslyandwas50%ofitsinitialweightattheendof12weeks.WhiletheweightofPDLLA/HA/DBMchangedlittlewithin5weeks,thenchangedobviouslyandwas60%oftheinitialweightattheendof12weeks.TheinitialbiomechanicalstrengthofPDLLAwas1.33MPa,decreasedlittlewithin3weeks,thenchangedobviouslyandkeptat0.11MPaattheendof12weeks.TheinitialbiomechanicalstrengthofPDLLA/HA/DBMwas1.7MPa,decreasedlittlewithin4weeks,thenchangedobviouslyandkeptat0.21MPaattheendof12weeks.Conclusions:Theemulsionblendmethodisanewmethodtopreparebonerepairmaterials.Asanewbonerepairmaterial,PDLLA/HA/DBMismoresuitableforregenerationandcellimplantation,andtheenvironmentduringitsdegradationisadvantageoustothegrowthofbonecells.
简介:摘要目的分析DL-96II微生物检测系统在临床的应用效果。方法选取卫生部临床检验中心下发的30株室间质控菌株(2016年~2018年)作为检测对象,运用DL-96II微生物检测系统与API微生物鉴定系统进行细菌鉴定和药敏分析,并将结果与卫生部临检中心回报的结果进行比较,分别比较两种检测系统的菌种鉴定符合率和DL-96II系统的药敏结果符合率。结果DL-96II系统的菌种鉴定符合率为86.67%,API系统的菌种鉴定符合率为96.67%,二者没有明显的差异(p值>0.05),DL-96II系统的药敏结果符合率为97.83%。结论DL-96II微生物检测系统的菌种鉴定准确率与API系统的相近,且药敏结果符合率很高,值得在基层医院推广使用。
简介:【摘要】:目的:分析 DL-96II 微生物检测系统在临床的应用效果 。 方法:选取卫生部临床检验中心下发的 30 株室间质控菌株( 2016 年 ~2018 年)作为检测对象,运用 DL-96II 微生物检测系统与 API 微生物鉴定系统进行细菌鉴定和药敏分析,并将结果与卫生部临检中心回报的结果进行比较,分别比较两种检测系统的菌种鉴定符合率和 DL-96II 系统的药敏结果符合率 。 结果:DL-96II 系统的菌种鉴定符合率为 86.67% , API 系统的菌种鉴定符合率为 96.67% ,二者没有明显的差异 ( p 值 > 0.05 ) , DL-96II 系统的药敏结果符合率为 97.83% 。 结论: DL-96II 微生物检测系统的菌种鉴定准确率与 API 系统的相近,且药敏结果符合率很高,值得在基层医院推广使用 。