简介:OnApril12,2011,Mr.WangPei’an,ViceMinisterofNationalPopulationandFamilyPlanningCommissionofChina(NPFPC)attendedthe44thSessionofUNCommissiononPopulationandDevelopmentinNewYork.Duringthesession,hepaidavisittoUNFPAheadquartersandhadaconversationwithDr.BabatundeOsotimehin,ExecutiveDirectorofUNFPA.ViceMinisterWangPei’anreviewedthecooperationbetweenChinaandUNFPAoverthepastthirtyyears.HeemphasizedthesubstantialcontributionsmadebythecooperationtothedevelopmentofChina’spopulationandfamilyplanning.HealsointroducedtheprogressbyChina
简介:Polyethyleneimine(PEI)functionalizedFe3O4MNPsweresynthesizedbyamodifiedhypothermaloxidativehydrolysismethod.Themagneticnanoparticlesshowedpositivelychargedsurface,strongmagneticresponsivityanduniformparticlesizedistributionat56.1±0.6nm.Aggregationofthesemagneticnanoparticleswereobservedonthesurfaceofdifferenttypeofbacteria.Magneticcapturingofbacteriawerefacilitatedbythesemagneticnanoparticles.Thecapturingefficiencycouldreach90%aftertworoundsofinteractionsof5minutes.ThemechanismandprocessofinteractionsbetweenbacteriaandpolyethyleneiminefunctionalizedFe3O4magneticnanoparticleswereexploredanddiscussed.ThepresentstudynotonlyprovidesinsightintointeractionsbetweenFe3O4@PEIMNPsandbacterialcells,butalsoopensanewavenuefordesigningandapplyingFe3O4@PEIMNPsasbiosensorsinmicrobiology,medicine,andenvironmentalscience.
简介:Thestraininducedcrystallizationbehaviourinpolyimidefrom1,4-bis(3’,4’-dicarboxyphenoxy)benzeneand4,4’-oxydianiline(PEI-E)hasbeeninvestigatedbyWAXD,DSCandFTIR.TheresultsobtainedshowthatcrystallizationinPEI-Edidtakeplacejustaftertensileyielding.Meanwhile,theeffectofstraininducedcrystallizationonthethermomechanicalpropertieswasstudiedbyDMAandTMA,theresultsofwhichindicatethatthecrystallizationandhotstretchinghaveacertaininfluenceonthedynamicmechanicalproperties,suchasweakeningtheβrelaxationanddecreasingtheglasstransitiontemperature.TheTMAresultsconfirmtheshiftingofglasstransitiontemperaturetolowertemperatureregionafterhotstretching.ThisphenomenoncouldbewellexplainedbytheeffectofresidualstressaccordingtoEyring’stheory.
简介:Inthispaper,quartzcrystalmicrobalance(QCM)gassensorscoatedwithpolyehtyleneimine(PEI)wasutilizedforcarbondioxide(CO2)detection.Thesensingmechanismisbasedontheavailabilityofreversibleacid-basereactionsbetweenCO2moleculesandPEIatroomtemperature.TheexperimentalresultsrevealedthatthePEI/starchsensorexhibitedmuchhighersensitivitythanthatofpurePEI,andshowedapproximatelinearityoveraconcentrationregionrangingfrom500ppmto8000ppm.Theinfluenceofhumidityhadalsobeeninvestigated.Furthermore,theresponseandrecoverytimedeceasedastheoperationtemperaturesincreased.Finally,sensitivitylossafterconservationforseveraldaysandreversibilityofthesensorshadbeendiscussed.
简介:Weldabilityofpolyetheretherketone(PEEK)withpolyetherimide(PEI)istested.AndcarbonfiberreinforcedPEEKlaminatesareresistanceweldedusingstainlesssteelmeshheatingelement.Theeffectsoftheweldingtimeandweldingpressureonthelapshearstrengthofjointsareinvestigated.ResultsshowthatPEEKcanhealwithPEIwellinweldingconditionandthelapshearstrengthofPEEK/CF(carbonfibre)jointincreaseslinearlywithweldingtime,butreachesamaximumvaluewhenweldingpressurerangingfrom0.3MPato0.5MPawithconstantweldingtime.ThefracturecharacteristicsofsurfaceareanalyzedbySEMtechniques,andfourtypesoffracturemodesoflapshearjointsaresuggested.
简介:在线教育资源是支持用户网络学习的重要组成部分,教育资源优劣直接影响用户学习质量。资源评价需要结合网络环境、网络交互行为、用户个体因素进行,促进资源与网络学习活动的有机融合。本研究借鉴三元交互理论,构建了在线教育资源PEI交互评价模型。基于对贵州省X市1032位中小学教师的调查数据,本研究运用SPSS22.0和AMOS18.0对模型进行因子和路径分析。研究结果证实,在线教育资源对用户个体、网络交互行为、网络学习环境的支持是影响资源评价的重要因素。实证研究发现:资源对用户个体因素的满足是影响用户评价资源的首要因素;用户个体因素与用户网络交互行为在资源评价中相互影响。研究建议:在线教育资源的设计与建设应注重对用户个体因素的满足,营造适宜的学习情境促进用户网络交互行为;将在线教育资源质量优化作为网络交互行为的一种形式,并设置在线教育资源优化奖励机制,进而满足用户个性化资源需求,更利于优质资源共享。
简介:摘要:在氧化石墨烯(GO)上合成了四氧化三铁纳米颗粒,然后与聚乙烯亚胺(PEI)混合,得到了GO/Fe3O4/ PEI纳米复合材料。由于GO的高比表面积、Fe3O4的超顺磁性以及PEI与Hg2+的优异配合能力,该纳米复合材料表现出极高的Hg2+去除效率。Hg2+的去除率为750 mg/g,高于大多数报道的结果。吸附动力学可用准二级模型描述。此外,GO/Fe3O4/PEI纳米复合材料可通过磁选回收。5次循环后,去除率仍为84%。
简介:Fertility,reproductivehealthanddevelopmentwerethethemesfordiscussioninthesession.Mr.WangPei'an,ViceMinisterofNationalPopulationandFamilyPlanningofChina(NPFPC)ledaChinesedelegationtoattendthe44thSessionofUNCommissiononPopulationandDevelopmentonApril11-15,2011atUNheadquartersinNewYork.Thethemesofthe44thsessionwereFertility,reproductivehealthanddevelopment.TheChairpersonofthe44thSessionwasBrianBowler(Malawi);TheVice-Chairpersonswere
简介:目的:探讨PEI作为免疫佐剂对G250抗原肽基因PVAX1/C-G250肽-C免疫保护效果的增强作用及联合应用CAIX蛋白疫苗进行PRIME—BOOST免疫程序免疫增强效果。方法:用EcoRI、XhoI和EcoRI、SalI分别双酶切PVAX1及既往构建的pET28a(+)/C-G250肽-C质粒。利用DNA重组技术构建重组质粒PVAX1/C-G250肽-C,酶切分析鉴定。大量提取质粒并分光光度计测质粒含量。将32只雌性昆明小鼠随机分为(A)裸DNA组,(B)DNA-PEI复合物组,(C)DNA-PEI+蛋白疫苗组,(D)空白对照组。按0,10,20,30天程序经股四头肌注射免疫。C组在第20天及第30天进行蛋白冲击。初次免疫前和第40天鼠尾取血,ELISA法检测抗体滴度。流式细胞术测淋巴细胞亚群CD4+和CD8+。结果:酶切及基因测序鉴定证实G250抗原肽cDNA正确插入PVAX1/C-G250肽-C真核表达的重组质粒中。昆明小鼠经4次免疫后,3个实验组都产生了特异性的体液和细胞免疫反应,B组的抗体滴度1:1.28×104及CD4+、CD8+达26.12%和12.60%,明显高于A组的1:3.2×103和CD4+,CD8+占到19.32%和10.74%。而蛋白冲击组的1:5.12×104和CD4+,CD8+占到41.96%和15.14%,明显高于B组(P〉0.05)。结论:成功构建重组质粒PVAX1/C-G250肽-C。该DNA疫苗与PEI和G250蛋白疫苗联合使用后产生极强的免疫原性,诱导产生了高滴度、高特异性抗体及细胞免疫反应。证实G250DNA疫苗联合PEI使用并进行蛋白疫苗冲击的免疫策略可产生强大的免疫保护作用。为恶性肿瘤的术后辅助治疗提供新的思路和方法。
简介:Twonewlybredhybridricecombinations,superhigh-yieldingLiangyoupeijiu(Pei'ai64S×9311)andPei'ai64S/E32(Pei'ai64S×E32)wereusedtoinvestigatethephotosyntheticcharacteristicsunderhightemperatureincomparisonwithhybridriceShangyou63.Hightemperaturecausedadecreasedphotosyntheticefficiencyandaggravatedphotoinhibition.TheoptimumtemperatureforphotosyntheticelectrontransportationandphotosyntheticCO2fixationwereabout28℃and35-40℃respectively.Linearelectrontransportationismoresensitivetohightemperaturethanthephotochemicalprocess.Themechanismofhightemperatureadaptationwaspossiblyasfollows:superhigh-yieldingricehasquicklyincreasingcarotenoid,whichactedasamorefavorableantioxidantsystemtoreducetheactiveoxygenproductionandavoiddamagetothephotosynthesissystem;superhigh-yieldingricehasahigherefficiencyofxanthophyllscycletodissipateexcessheatenergy;superhigh-yieldingricehasamorestablephotosyntheticfunction,higherphotosyntheticefficiencyandmoreheatstableproteincontent.
简介:摘要目的评估超声乳化白内障摘出人工晶状体植入术(PEI)联合房角分离术(GSL)及房角切开术(GT)治疗中晚期原发性闭角型青光眼(PACG)的有效性和安全性。方法采用系列病例观察性研究方法,于2020年8月至2021年6月在中山大学中山眼科中心连续纳入中晚期PACG患者50例50眼,所有患眼均接受PEI+GSL+GT,随访时间至少6个月,平均随访7.5(6,10)个月。采用Goldmann压平眼压计测定患者手术前后眼压;采用ETDRS视力表测定患眼最佳矫正视力(BCVA),并转换为LogMAR视力分析;收集抗青光眼用药种类及数量信息和手术并发症资料。计算患眼手术成功率,完全成功定义为术后不使用任何抗青光眼药物眼压为5~18 mmHg(1 mmHg=0.133 kPa)且眼压较基线下降20%,无威胁视力的并发症,无需接受额外的抗青光眼手术,无光感丢失;条件成功定义为使用或不使用抗青光眼药物达到上述条件。结果术眼术前平均眼压为(28.81±7.81)mmHg,末次随访平均眼压为(13.41±4.10)mmHg,术后眼压较术前显著下降,差异有统计学意义(t=12.260,P<0.001);与术前比较,术后眼压平均降低13.80(9.10,19.40)mmHg,降幅为51.1%(38.6%,67.1%)。术前平均BCVA为(0.92±0.11)LogMAR,术后末次随访时为(0.88±0.10)LogMAR,手术前后BCVA比较差异无统计学意义(t=-0.560,P=0.580)。术前平均使用降眼压药物2(1,3)种,术后为0(0,0)种。手术完全成功率为80%(40/50),条件成功率为94%(47/50)。术中和术后并发症主要包括前房积血7眼,一过性眼压升高7眼,角膜水肿3眼,未出现威胁视力的并发症。结论PEI+GSL+GT治疗中晚期PACG能够有效降低眼压、减少降眼压药物的使用种类和数量,手术安全性好。