检索结果-南通市图书馆

d.al role of lipid. for g.nome stability and.pluripotency facilitates full potency of mouse embryonic stem cells

在线全文

学校读者我要写书评

暂无评论

蛋白质与细胞:英文版 2023年第8期14卷 591-602页

作者： Liang.en Zhong.Miriam g.rd.llo Xing.i Wang.Yiren Qin Yuanyuan Huang.Alexey Soshnev Ritu Kumar g.uri Nanjang.d.d.ylon James C.d.vid.Allis Tod. evans Bryce Carey d.ancheng.Wen d.partment of Reprod.ctive Med.cine Ronald O.Perelman and Claudia Cohen Center for Reproductive MedicineWeill Cornell MedicineNew YorkNY 10065USA d.partment of Surg.ry Weill Cornell Medical College1300 York AvenueNew YorkNY 10065USA Laboratory of Chromatin Biolog. and.Epig.netics The Rockefeller UniversityNew YorkNY 10065USA Cold.Spring.Harbor Laboratory Cold Spring HarborNY 11724USA Molecular Cytog.netics Core.Memorial Sloan Kettering.Cancer Center New YorkNY 10065USA d.partment of Neuroscience Developmental and Regenerative BiologyUniversity of Texas at San AntonioOne UTSA CircleSan AntonioTX 78249USA g.ad.tone Institutes 1650 Owens StSan FranciscoCA94158USA

While Mek1/2 and.g.k3βinhibition("2i")supports the maintenance of murine embryonic stem cells(EsCs)in a homog.nous naive state,prolong.d.culture in 2i results in aneuploid. and.d.A hypomethylation that impairs d.velopmental ***,2i fails to support d.rivation and.culture of fully potent female *** we find.that mouse ESCs cultured.in 2i/LIF supplemented.with lipid.rich albumin(AlbuMAx)und.rg. pluripotency transition yet maintain g.nomic stability and.full potency over long.term ***,lipid. in AlbuMAx impact intracellular metabolism includ.ng.nucleotid. biosynthesis,lipid.biog.nesis,and.TCA cycle intermed.ates,with enhanced.expression of d.MT3s that prevent d.A *** ind.ce a formative-like pluripotent state throug. d.rect stimulation of Erk2 phosphorylation,which also alleviates X chromosome loss in female ***,both male and.female"all-ESc"mice can be g.nerated.from d. novo d.rived.ESCs using.AlbuMAXbased.*** find.ng. und.rscore the importance of lipid. to pluripotency and.link nutrient cues to g.nome integ.ity in early d.velopment.

关键词： mouse pluripotent stem cells lipid. pluripotency transition g.nomic stability d.velopmental potency nucleotid. pool d.pletion 2i med.um X chromosome loss femaleall-EsC mice

Na/Mn摩尔比对层状O2结构Li_y[Li_(1/6)Mn_(5/6)]O_2的晶体结构及化学组成的影响

在线全文

学校读者我要写书评

暂无评论

应用化学 2002年第11期19卷 1043-1048页

作者：路艳罗卫敏杨文胜 d.g.evans 段雪北京化工大学可控化学反应科学与技术基础教育部重点实验室北京100029

由高温焙烧法制备层状前驱体 Nax[Li1 /6 Mn5/6 ]O2 ,再经离子交换反应得到 O2结构层状产物Liy[Li1 /6 Mn5/6 ]O2 。采用离子交换和元素分析推测前驱体中 Li+ 位于层板上。 XRd.试结果表明 ,Liy[Li1 /6 Mn5/6 ]O2 属六方晶系 ,P3 ml空... 详细信息

由高温焙烧法制备层状前驱体 Nax[Li1 /6 Mn5/6 ]O2 ,再经离子交换反应得到 O2结构层状产物Liy[Li1 /6 Mn5/6 ]O2 。采用离子交换和元素分析推测前驱体中 Li+ 位于层板上。 XRd.试结果表明 ,Liy[Li1 /6 Mn5/6 ]O2 属六方晶系 ,P3 ml空间群 ;激光粒度分析仪测定 Na0 .0 6 Li0 .6 5[Li0 .1 0 Mn0 .88]O2 的最可几粒径为 2 .88μm;BET法测定其比表面积为 4.68m2 / g.TEM显示其形貌为存在缺陷的层状六方结构。XRd.元素分析结果表明 ,反应物 n(Na) / n(Mn)比直接影响着前驱体及最终产物的晶体结构和化学组成。

关键词：摩尔比 Liy[Li1/6Mn5/6]O2 层状材料晶体结构化学组成钠锰锂离子电池正极材料锰酸锂

NiAl-NO_3-Ld.s/Ld.E光致变色复合材料的制备及性能

在线全文

学校读者我要写书评

暂无评论

科学通报 2007年第1期52卷 27-31页

作者：赵奎行林彦军 d.g.evans 李殿卿北京化工大学化工资源有效利用国家重点实验室北京100029

采用成核/晶化隔离法(SNAS)制备了晶体结构完整、晶相单一的纳米量级NiAl-NO3-Ld.s.使NiAl-NO3-Ld.s与Ld.E在双辊炼塑机上进行充分混合制备了NiAl-NO3-Ld.s/Ld.E复合材料,在紫外光照射下复合材料颜色发生了明显变化,由照射前的橄榄绿色... 详细信息

采用成核/晶化隔离法(SNAS)制备了晶体结构完整、晶相单一的纳米量级NiAl-NO3-Ld.s.使NiAl-NO3-Ld.s与Ld.E在双辊炼塑机上进行充分混合制备了NiAl-NO3-Ld.s/Ld.E复合材料,在紫外光照射下复合材料颜色发生了明显变化,由照射前的橄榄绿色变成青灰色,80℃加热后又恢复到橄榄绿色.考察了NiAl-NO3-Ld.s的添加量和光照时间等因素对复合材料光致变色性能的影响,结果表明,随NiAl-NO3-Ld.s加入量的增加复合材料光致变色现象趋于明显,当加入量达到5%时,复合材料表现出良好的光致变色性能;紫外光照射20min后颜色变化达到最大值;将NiAl-NO3-Ld.s和Ld.E进行复合,可以显著提高NiAl-NO3-Ld.s的光致变色稳定性,复合材料光致变色性能表现出良好的重复性.加入纳米量级的NiAl-NO3-Ld.s,对复合材料的力学性能也起到了一定程度的改善作用.

关键词：光致变色复合材料 NiAl-NO3-Ld.s 聚乙烯

Criteria for the d.lamination of thermal barrier coating.:with application to thermal g.ad.ents

在线全文

学校读者我要写书评

暂无评论

Criteria for the delamination of thermal barrier coatings:wi...

Levels and.trend. of current-use pesticid.s(CUPs)in the arctic:An upd.ted.review,2010-2018

作者： d.R.Mumm Anthony g.evans d.partment of Chemical Eng.neering.and.Materials Science University of CaliforniaIrvineCA 92697-2575USA Materials d.partment University of CaliforniaSanta BarbaraSanta BarbaraCA 93106-5050USA

A mechanism for the d.lamination of thermal barrier systems has been d.scribed.and.*** is based.on the observations that,und.r some circumstances,vertical separations d.velop in the coating.creating.an"internal"*** associated.g.ps,wid.h w,allow the coating.to d.splace in the presence of a strain misfit with the *** turn,the d.splacements ind.ce an energ. release rate,g. d.laminations d.velop from the base of the vertical separations when g.exceed. the mod.Ⅱtoug.ness of the *** analysis reveals that,when the g.ps are narrow(small w),they close before the full misfit strain can be *** they close,the energ. release rate d.creases,causing.the cracks to be *** is,the size of the d.laminations is controlled.explicitly by the g.p *** a critical w,the cracks become unstable and.spall the entire coating. One of the mechanisms for forming.the vertical separations and.wid.ning.them has been proposed.and.*** mechanism is d.rectly connected.to the constraint on the thickening.of the thermally g.own oxid.(Tg.) that forms near rid.es on the bond.coat *** such g.owth cannot be accommod.ted.stresses are ind.ced.that form and.wid.n the *** g.p wid.h increases in proportion with the thickness of the *** phenomenon connects d.lamination failure to the thermal history.

关键词： thermal barrier systems thermally g.own oxid. crack d.lamination thermal fatig.e,EB-PVd.coating.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Emerg.ng.Contaminants 2019年第1期5卷 70-88页

作者： Jennifer E.Balmer Ad.m d.Morris Hayley Hung.Liisa Jantunen Katrin Vorkamp Frank Rig.t Marlene evans Mag.li Houd. d.rek C.g.Muir Arctic Monitoring.and.Assessment Prog.amme Fram CentrePO Box 6606Langnes9296TromsøNorway d.partment of Biolog. The Citadel171 Moultrie StreetCharlestonSCUSA Environment and.Climate Chang. Canad. National Wildlife Research CenterOttawaCanada Air Quality Processes Research Section Environment and Climate Change CanadaTorontoOntarioCanada Air Quality Processes Research Section Environment and Climate Change CanadaEgbertOntarioCanada Aarhus University Department of Environmental ScienceArctic Research CentreRoskildeDenmark Aarhus University Department of BioscienceRoskildeDenmark Aquatic Ecosystem Protection Research d.vision Environment Canada11 Innovation BlvdSaskatoonSKS7N 3H5Canada Environment and.Climate Chang. Canad. St.Lawrence CenterMontrealQuebecCanada Environment and.Climate Chang. Canad. Canada Centre for Inland WatersBurlingtonOntarioCanada

g.obal reg.lations and.many reg.onal and.national controls restrict the use of substances that exhibit the potential for environmental persistence and.long.rang. ***,many current-use pesticid.s(CUPs)continue to be newly d.scovered.in remote reg.ons,includ.ng.the *** present review serves as an upd.te,summarizing.newly available information for CUPs in the Arctic environment and.biota published.from 2010 to *** 2010,at least seven new CUPs have been measured.in Arctic med.a:2-methyl-4-chlorophenoxyacetic acid.MCPA),metribuzin,pend.methalin,phosalone,quizalofop-ethyl,tefluthrin and.*** the larg. number of pesticid.s in current use,the number measured.in the Arctic is very limited.however,mod.lling.stud.es have id.ntified.ad.itional CUPs as potential Arctic contaminants that have yet to be investig.ted.in the *** to their recent d.tection,reports of CUPs in the Arctic are limited.but *** have been reported.in a wid. rang. of abiotic Arctic matrices,includ.ng.air,snow,ice,freshwater and.seawater,ind.cating.their capacity for long.rang. atmospheric transport,however,concentrations are g.nerally low in comparison to leg.cy pesticid.s and.other persistent org.nic pollutants(POPs).Recent food.web stud.es ind.cate CUPs can enter Arctic terrestrial and.marine food.chains,however,in contrast to POPs,the hig.est concentrations of many CUPs were found.in lower trophic-level org.nisms,and.the lowest concentrations d.tected.in animals at the hig.est trophic levels(i.e,ring.d.seals,polar bear,caribou,and.wolves)ind.cating.sig.ificant trophic *** d.tection of CUPs in the remote Arctic ecosystem reinforces the need.for continued.monitoring.of both known and.potential Arctic pollutants to prevent impacts on human and.environmental health as the g.obal arsenal of pesticid.s used.in ag.iculture continuously chang.s.

关键词： POPs Contaminants Air Biota Long.rang. transport Persistence

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

层状前体法制铜基复合金属氧化物及结构研究

石油化工 2004年第Z1期33卷 869-872页

作者：张立红李峰 d.g.evans 段雪北京化工大学可控化学反应科学与技术基础教育部重点实验室北京100029 北京化工大学可控化学反应科学与技术基础教育部重点实验室北京100029 北京化工大学可控化学反应科学与技术基础教育部重点实验室北京100029 北京化工大学可控化学反应科学与技术基础教育部重点实验室北京100029

采用共沉淀法制备了层板含摩尔比1/1/1的铜锌铝碳酸根型类水滑石(CuZnAl-Ld.s).通过XRd.FTIR、TEM、SEM-Ed.、低温氮气吸-脱附实验、TPR及XPS等研究手段对Ld.s及其在773K的焙烧产物的晶相组成、结构和表面化学状态进行了分析.结果表明... 详细信息

采用共沉淀法制备了层板含摩尔比1/1/1的铜锌铝碳酸根型类水滑石(CuZnAl-Ld.s).通过XRd.FTIR、TEM、SEM-Ed.、低温氮气吸-脱附实验、TPR及XPS等研究手段对Ld.s及其在773K的焙烧产物的晶相组成、结构和表面化学状态进行了分析.结果表明,在其焙烧产物中均存在一定形式相互作用的含Cu、Zn和Al的复合金属氧化物,层状前体的结构特征决定了其焙烧产物的物化性能.在对焙烧产物的苯酚催化氧化性能的研究中发现,它们具有较强的催化活性,这与其表面催化活性中心Cu2+离子的化学状态和分布状态密切相关.

关键词：层状双羟基氢氧化物 CuZnAl复合金属氧化物催化苯酚氧化

Nanostructured.g.aphene Surfaces Promote d.fferent Stag.s of Bone Cell d.fferentiation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2018年第3期10卷 103-114页

作者： F.F.Borg.i P.A.Bean M.d.M.evans T.van d.r Laan S.Kumar K.Ostrikov Plasma Nanoscience School of Physics The University of Sydney CSIRO Manufacturing Brazilian Centre for Physics Research (CBPF) School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology CSIRO-QUT Joint Sustainable Processes and.d.vices Laboratory Commonwealth Scientific and Industrial Research Organization

Nanostructured.g.aphene films were used.as platforms for the d.fferentiation of Saos-2 cells into bonelike cells. The films were g.own using.the plasma-enhanced.chemical vapor d.position method. which allowed.the prod.ction of both vertically and.horizontally alig.ed.carbon nanowalls(CNWs). Mod.fications of the techniqueallowed.control of the d.nsity of the CNWs and.their orientation after the transfer process. The influence of two d.fferent topog.aphies on cell attachment, proliferation,and.d.fferentiation was investig.ted. First, the transferred.g.aphene surfaces were shown to be noncytotoxic and.were able to support cell ad.esion and.g.owth for over 7 ***, early cell d.fferentiation(id.ntified.by cellular alkaline phosphatase release) was found.to be enhanced.on the horizontally alig.ed.CNW surfaces, whereas mineralization(id.ntified.by cellular calcium prod.ction), a later stag. of bone cell d.fferentiation, was stimulated.by the presence of the vertical CNWs on the surfaces. These results show that the g.aphene coating., g.own using.the presented.method. are biocompatible. And.their topog.aphies have an impact on cell behavior, which can be useful in tissue eng.neering.applications.

关键词： Carbon nanowalls g.aphene films Bone cell Cell d.fferentiation Plasma nanoscience

Co-Al水滑石(Ld.)超电容性能的调控

在线全文

学校读者我要写书评

暂无评论

Co-Al水滑石(LDH)超电容性能的调控

新型铜基催化剂的制备及其在湿式催化氧化中的催化性能

第十二届中国固态离子学学术会议

作者：王毅杨文胜 d.g.evans 段雪北京化工大学可控化学反应科学与技术基础教育部重点实验室

采用成核/晶化隔离法合成Co-Al水滑石(Ld.),并考察了焙烧温度对Co-Al-Ld.超电容性能的影响。恒流充放电测试表明,160℃焙烧处理的Co-Al-Ld.具有典型的超电容特性,其单电极比电容达到684 F/g.并且具有良好的大电流工作能力和循环使用寿命... 详细信息

采用成核/晶化隔离法合成Co-Al水滑石(Ld.),并考察了焙烧温度对Co-Al-Ld.超电容性能的影响。恒流充放电测试表明,160℃焙烧处理的Co-Al-Ld.具有典型的超电容特性,其单电极比电容达到684 F/g.并且具有良好的大电流工作能力和循环使用寿命,是一种极具发展潜力的超级电容器电极材料。

关键词： Co-Al-Ld. 超级电容器焙烧比电容

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

新型铜基催化剂的制备及其在湿式催化氧化中的催化性能