检索结果-南通市图书馆

The pa.erna. epigenome a.d embryogenesis： poising mecha.isms for development

a.ia. Journa. of a.drology 2011年第1期13卷 76-80页

作者： Timothy G Jenkins douglas T Ca.rell a.drology a.d IVF La.ora.ories Department of Surgery University of Utah Salt Lake City UT 84108 USA Depa.tment of Obstetrics a.d Gynecology University of Utah School of Medicine Salt Lake City UT 84108 USA Depa.tment of Physiology University of Utah School of Medicine Salt Lake City UT 84108 USA

The scope of pa.erna. contributions during ea.ly embryonic development ha. long been considered limited. Dra.a.ic cha.ges in chroma.in structure throughout sperma.ogenesis ha.e been thought to lea.e the sperm void of complex la.ers of epigenetic regula.ion over the DNa.blueprint, thus lea.ing the ba.a.ce of tha. regula.ion to the oocyte. However, recent work in the fields of epigenetics a.d ma.e fa.tor infertility ha. pla.ed this long-held, a.d now controversia. dogma. in a.new light. Elega.t studies investiga.ing chroma.in a.d epigenetic modifica.ions in the developing sperm cell ha.e provided new insights tha. ma. esta.lish a.more critica. role for the pa.erna. epigenome in the developing embryo. DNa.methyla.ion, histone ta.l modifica.ions, ta.geted histone retention a.d prota.ine incorpora.ion into the chroma.in ha.e grea. influence in the developing sperm cell. Perturba.ions in the esta.lishment a.d/or ma.ntena.ce of a.y of these epigenetic ma.ks ha.e been demonstra.ed to a.fect fertility sta.us, ra.ging in severity from mild to ca.a.trophic. Sperm require this myria. of chroma.in structura. cha.ges not only to serve a.protective role to DNa.throughout sperma.ogenesis a.d future delivery to the egg, but a.so, it a.pea.s, to contribute to the developmenta. progra. of the future embryo. This review will focus on our current understa.ding of the epigenetics of sperm. We will discuss sperm-specific chroma.in modifica.ions tha. result in genes essentia. to development being poised for a.tiva.ion ea.ly in embryonic development, the disruption of which ma. result in reduced fecundity.

关键词： chroma.in DNa.methyla.ion embryogenesis epigenetics histone modifica.ion ma.e infertility

来源：

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

a.sessing Potentia. Ea.thqua.e Loss in Me′rida.Sta.e, Venezuela.Using Ha.us

引用

Interna.iona. Journa. of Disa.ter Risk Science 2014年第3期5卷 176-191页

作者： a.érica.Bendito Jesse Rozelle douglas Ba.sch Civil Engineering Depa.tment Universidad de Los AndesMe´rida 5101Venezuela Mitiga.ion Division Federal Emergency Management Agency(FEMA)Region VIIIDenverCO 80225USA

The focus of the Ha.us ea.thqua.e model ha. been la.gely U.S. centric due to a.la.k of sta.da.dized building-infra.tructure da.a.forma.s a.plica.le *** a.combined effort between FEMa.Region VIII a.d the Universida. de Los a.des, Venezuela. the present study uses the Ha.us 2.1 softwa.e to simula.e ea.thqua.e loss estima.ions for Venezuela. Popula.ion tota.s a.d demogra.hic distributions were developed using Oa. Ridge Na.iona. La.s La.dsca. 2008 popula.ion da.a.a.d the census 2011 for Venezuela. The a.cura.y of the model wa. further enha.ced for Me′rida.Sta.e, loca.ed in western Venezuela. by collecting, incorpora.ing, a.d developing region a.d specific inventories including soil ma.s, liquefa.tion a.d la.dslide susceptibility studies, demogra.hic da.a. a.d building inventory informa.ion. We used USGS Sha.e Ma.s scena.ios for two potentia. ea.thqua.e events with pea. ground a.celera.ions proposed within Performa.ce Ba.ed Seismic Engineering of Buildings, VISION 2000 recommenda.ions. The region ha. not witnessed a. ea.thqua.e with a.ma.nitude grea.er tha. M 7 in the la.t120 yea.s. Given the historica. record of seismicity a.d the seismotectonics in the region, it becomes increa.ingly importa.t to understa.d the potentia. implica.ions from modera.e to la.ge ea.thqua.es in Me′rida.Sta.e, Venezuela.

关键词： Disa.ter loss estima.ion Ea.thqua.e da.a.e Ha.us Seismic risk Venezuela

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HYERS-ULa. STa.ILITY OF SECOND-ORDER LINEa. DYNa.IC EQUa.IONS ON TIME SCa.ES

引用

a.ta.Ma.hema.ica.Scientia 2021年第5期41卷 1809-1826页

作者： douglas R.a.DERSON Ma.a.a.u ONITSUKA Depa.tment of Ma.hema.ics Concordia CollegeMoorheadMN 56562 USA Depa.tment of a.plied Ma.hema.ics kayama University of ScienceOkayama700-0005Japan

We investiga.e the Hyers-Ula. sta.ility(HUS)of certa.n second-order linea. consta.t coefficient dyna.ic equa.ions on time sca.es,building on recent results for first-order consta.t coefficient time-sca.e *** pa.ticula.,for the ca.e where the roots of the cha.a.teristic equa.ion a.e non-zero rea. numbers tha. a.e positively regressive on the time sca.e,we esta.lish tha. the best HUS consta.t in this ca.e is the reciproca. of the a.solute product of these two *** for insta.ility a.e a.so given.

关键词： sta.ility second order Hyers-Ula. time sca.es

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spa.iotempora. Evolution of West a.rica.s Urba. La.dsca.e Cha.a.teristics a.plying Ha.monized DMSP-OLS a.d NPP-VIIRS Nighttime Light(NTL)Da.a

引用

Chinese Geogra.hica. Science 2022年第6期32卷 933-945页

作者： SONO douglas WEI Ye CHEN Zuoqi JIN Ying School of Geogra.hica. Sciences Northeast Normal UniversityChangchun 130024China Na.ura. Resources Institute of Jilin Province Changchun 130024China Key La.ora.ory of Spa.ia. Da.a.Mining a.d Informa.ion Sha.ing of Ministry of Educa.ion National&Local Joint Engineering Research Center of Satellite Geospatial Information TechnologyFuzhou UniversityFuzhou 35002China The a.a.emy of Digita. China Fuzhou UniversityFuzhou 350002China School of Huma.ities a.d La. Northeastern UniversityShenyang 110169China

Investiga.ing urba. expa.sion pa.terns a.ds in the ma.a.ement of urba.iza.ion a.d in a.eliora.ing the socioeconomic a.d environmenta. issues a.socia.ed with economic tra.sforma.ion a.d susta.na.le *** Ha.monized Defense Meteorologica. Sa.ellite Progra.-Opera.iona. Line-sca. System(DMSP-OLS)a.d the Suomi Na.iona. Pola.-Orbiting Pa.tnership-Visible Infra.ed Ima.ery Ra.iometer Suite(NPP-VIIRS)Nighttime Light(NTL)da.a.this pa.er investiga.ed the cha.a.teristics of urba. la.dsca.e in West *** the ha.monized NTL da.a.spa.ia. compa.ison a.d empirica. threshold methods were employed to detect urba. cha.ges from 1993 to *** exa.ined the ra.e of urba. cha.ge a.d ca.cula.ed the direction of the urba. expa.sion of West a.rica.using the center-of-gra.ity method for urba. *** a.dition,we used the la.dsca.e expa.sion index method to a.sess the processes a.d sta.es of urba. growth in West *** a.cura.y of urba. a.ea.extra.tion ba.ed on NTL da.a.were R^(2)=0.8314 in 2000,R^(2)=0.8809 in 2006,R^(2)=0.9051 in 2012 for the DMSP-OLS a.d the simula.ed NPP-VIIRS wa. R^(2)=0.8426 in 2018,by using Google Ea.th ima.es a. *** results indica.ed tha. there wa. a.high ra.e a.d a.celera.ion of urba. la.dsca.es in West a.rica.with ra.es of 0.0160,0.0173,0.0189,a.d 0.0686,a.d a.celera.ions of 0.31,0.42,0.54,a.d 0.90 for the periods of 1998–2003,2003–2008,2008–2013,a.d 2013–2018,*** expa.sion direction of urba. a.glomera.ion in West a.rica.during 1993–2018 wa. ma.nly from the coa.t to ***,cities loca.ed in the Sa.el Region of a.rica.a.d in the middle zone expa.ded from north to ***,the results showed tha. the urba. la.dsca.e of West a.rica.wa. ma.nly in a.sca.tered a.d disordered’diffusion’process,wherea. only a.few cities loca.ed in coa.ta. a.ea. experiencing the process of’coa.escence’a.cording to urba. growth pha.e *** study provides urba. pla.ners with releva.t insights for the urba. expa.sion cha.a.ter

关键词： urba. expa.sion nighttime light remote sensing DMSP-OLS(Defense Meteorologica. Sa.ellite Progra.-Opera.iona. Line-sca. System) NPP-VIIRS(Suomi Na.iona. Pola.-Orbiting Pa.tnership-Visible Infra.ed Ima.ery Ra.iometer Suite) spa.iotempora. evolution West a.rica

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

a. interview with douglas Biber

引用

语料库语言学 2018年第1期5卷 1-13页

作者： Jia.in Xu douglas Biber 不详

JX:Jia.in Xu;DB:douglas Biber JX:It is a.grea. honor tha. you ha.e so kindly a.reed to be interviewed. This interview is pa.t of my resea.ch project on the history of a.erica.corpus linguistics. I ha.e prepa.ed some questions concerning your persona. history in corpus linguistics, corpus linguistics a. Northern a.izona.University (Na.),a.d corpus linguistics in the United Sta.es a. la.ge.

关键词： a. interview with douglas Biber Na. DB

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effectiveness of a.fixed-depth sensor deployed from a.buoy to estima.e wa.er-column cya.oba.teria. bioma.s depends on wind speed

引用

Journa. of Environmenta. Sciences 2020年第7期32卷 23-29页

作者： Justin D.Cha.fin douglas D.Ka.e a.ex Johnson F.T Stone La.ora.ory a.d Ohio Sea.Gra.t the Ohio State UniversityOH 43456USA Division of Na.ura. Science Applied Scienceand MathematicsDefiance CollegeDefiance OHF.T Stone LaboratoryThe Ohio State University and Ohio Sea GrantOH 43456USA

Wa.er qua.ity sondes ha.e the a.va.ta.e of conta.ning multiple sensors,extended deployment times,high tempora. resolution,a.d telecommunica.ion with sta.eholder a.cessible da.a.***,sondes tha. a.e pa.t of buoy deployments often suffer from typica.ly being fixed a. one *** wa.er trea.ment pla.ts a.e interested in wa.er qua.ity a. a.depth of the wa.er inta.e a.d other sta.eholders(*** a.d swimmers)a.e interested in the surfa.e,we exa.ined whether a.fixed depth of a.proxima.ely 1 m could ca.se over-or under-estima.ion of cya.oba.teria. *** sa.pled the vertica. distribution of cya.oba.teria.a.ja.ent to a.wa.er qua.ity sonde buoy in the western ba.in of La.e Erie during the summers of 2015–2017.a.compa.ison of buoy cya.oba.teria.RFU(Rela.ive Fluorescence Unit)a. 1 m to cya.oba.teria.chlorophyll a.chla.mea.ured throughout the wa.er column showed occurrences when the buoy both under a.d overestima.ed the cya.oba.teria.chl a.a. specific *** differences between buoy mea.urements a.d a.-depth gra. sa.ples occurred during low wind speeds(a.se low winds a.lowed cya.oba.teria.to a.cumula.e a. the surfa.e a.ove the buoy’s *** wind speeds(>4.5 m/sec)resulted in better a.reement between the buoy a.d a.-depth *** wind speeds 12 hr before sa.ple collection decrea.ed the difference between the buoy a.d a.-depth sa.ples for high wind speeds but not low *** suggest tha. sondes should be pla.ed a. a.depth of interest for the a.propria.e sta.eholder group or deploy sondes with the a.ility to sa.ple a. va.ious depths.

关键词： Buoya.cy Ha.mful a.ga. bloom La.e Erie Microcystis Wa.er qua.ity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Eva.ua.ion of a.cestry from huma. skeleta. rema.ns: a.concise review

引用

Forensic Sciences Resea.ch 2020年第2期5卷 89-97页

作者： Eugenia.Cunha.douglas HUbela.er Na.iona. Institute of Lega. Medicine a.d Forensic Sciences LisbonPortugal La.ora.ory of Forensic a.thropology Centre for Functional EcologyDepartment of Life SciencesUniversity of CoimbraCoimbraPortugal Depa.tment of a.thropology National Museum of Natural HistorySmithsonian InstitutionWashingtonDCUSA

a.cestry a.sessment represents a.ma.or component of forensic a.thropologica. a.a.ysis of recovered huma. *** of a.cestry,together with other a.pects of the biologica. profile,ca. help na.row the sea.ch of missing persons a.d contribute to eventua. positive *** informa.ion ca. prove useful to a.thorities involved in the identifica.ion a.d investiga.ive process since ma.y lists of missing persons ha.e a.reference to this *** resea.ch ha. strengthened a.a.la.le methodologies involving metric,non-metric morphologica. a. well a. chemica. a.d genetic *** review a.dresses the new a.thropologica. techniques tha. a.e now a.a.la.le,a. well a. the complex historica. context rela.ed to a.cestry eva.ua.ion.

关键词： Forensic sciences forensic a.thropology a.cestry estima.ion skeleta. rema.ns

来源：

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

Potentia. influence of wildfire in modula.ing clima.e-induced forest redistribution in a.centra. Rocky Mounta.n la.dsca.e

引用

Ecologica. Processes 2017年第1期6卷 52-68页

作者： John L.Ca.pbell douglas J.Shinnema. Depa.tment of Forest Ecosystems a.d Society Oregon State UniversityCorvallisORUSA U.S.Geologica. Survey Forest and Rangeland Ecosystem Science CenterBoiseIDUSA.

Introduction:Clima.e cha.ge is expected to impose significa.t tension on the geogra.hic distribution of tree ***,tree species ra.ge shifts ma. be dela.ed by their long life spa.s,ca.a.ity to withsta.d long periods of physiologica. stress,a.d dispersa. *** could theoretica.ly brea. this biologica. inertia.by killing forest ca.opies a.d fa.ilita.ing species redistribution under cha.ging *** investiga.ed the ca.a.ity of wildfire to modula.e clima.e-induced tree redistribution a.ross a.monta.e la.dsca.e in the centra. Rocky Mounta.ns under three clima.e scena.ios(contempora.y a.d two wa.mer future clima.es)a.d three wildfire scena.ios(representing historica.,suppressed,a.d future fire regimes).Methods:Distributions of four common tree species were projected over 90 yea.s by pa.ring a.clima.e niche model with a.forest la.dsca.e simula.ion model tha. simula.es species dispersa.,esta.lishment,a.d morta.ity under a.terna.ive disturba.ce regimes a.d clima.e ***:Three species(douglas-fir,lodgepole pine,suba.pine fir)declined in a.unda.ce over time,due to clima.e-driven contra.tion in a.ea.suita.le for esta.lishment,while one species(ponderosa.pine)wa. una.le to exploit clima.e-driven expa.sion of a.ea.suita.le for *** fire frequency a.celera.ed declines in a.ea.occupied by douglas-fir,lodgepole pine,a.d suba.pine fir,a.d it ma.nta.ned loca. a.unda.ce but not ra.ge expa.sion of ponderosa.***:Wildfire ma. pla. a.la.ger role in elimina.ing these conifer species a.ong tra.ling edges of their distributions tha. fa.ilita.ing esta.lishment a.ong lea.ing edges,in pa.t due to dispersa. limita.ions a.d interspecific competition,a.d future popula.ions ma. increa.ingly depend on persistence in loca.ions unfa.ora.le for their esta.lishment.

关键词： Forest disturba.ce Wildfire Clima.e cha.ge Centra. Rocky Mounta.ns Clima.e niche Species migra.ion Species distribution

来源：

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

Mea.uring the Effectiveness of the Chinese Innova.ion System:a.Globa. Va.ue Cha.n a.proa.h

引用

Interna.iona. Journa. of Innova.ion Studies 2017年第1期1卷 57-71页

作者： douglas Zhihua.Zeng Tia.jin Norma. University 393 West Binshui Ave.Tianjin 300387China World Ba.k 1818 H St.WashingtonDC 20433USA University of Interna.iona. Business&Economics 10 Huixin DongjieChaoyang DistrictBeijing 100029China Xi’a. Jia.tong‐Liverpool University No.111 RenʹailuSuzhouJiangsu 215123China

This pa.er study a.gues tha. some disruptive new trends a.e surfa.ing with the emergence of new technologies,which ma.es a. efficient a.d effective R&D a.d innova.ion system even more releva.t for a.y country to compete a. a.globa. *** this ba.kdrop,the study tries to mea.ure the effectiveness of the Chinese innova.ion system,using the“R&D spending a. percenta.e of GDP”a. the input va.ia.le a.d the“contribution of R&D a.d rela.ed business a.tivities to the va.ue‐a.ded ma.ufa.turing exports”a. the output *** on a.59‐country sa.ple in the OECD‐WTO TiVa.da.a.a.e,the regression results show a.significa.t a.d positive correla.ion between the two *** findings a.so complement with other existing empirica. a.d qua.ita.ive studies in this *** overa.l findings show tha. China.ha. a.hieved significa.t efficiency a.d effectiveness in its innova.ion system compa.ed with ma.y other countries;in fa.t,since 2009,the efficiency ha. ***,it still la.s behind the ma.or globa. *** mea.s China.still ha. some room to improve in order to tra.sform its increa.ing inputs in R&D a.d technology innova.ion into commensura.e *** situa.ion ca.ls for further improvements in its innova.ion ecosystem.

关键词： Innova.ion China Globa. Va.ue Cha.n R&D Tra.e

来源：

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

Ionic liquid/tetra.lyme hybrid Mg[TFSI]_2 electrolytes for recha.gea.le Mg ba.teries

引用

Green Energy & Environment 2019年第2期4卷 146-153页

作者： Zheng Ma.Ma.ia.Forsyth douglas R.Ma.Fa.la.e Mega.Ka. School of Chemistry Faculty of Science Monash University a.C Centre of Excellence for Electroma.eria.s Science IFM – Institute for Frontier Materials Deakin University

The electrochemica. reversibility of Mg in hybrid electrolytes ba.ed on mixtures of ionic liquid a.d glyme ba.ed orga.ic solvents wa. investiga.ed for a.plica.ions in recha.gea.le ma.nesium ba.teries(RMBs). The electrolytes demonstra.e reversible reduction a.d oxida.ion of Mg only a.ter being pre-trea.ed with the dehydra.ing a.ent, ma.nesium borohydride, Mg[BH_4]_2, highlighting the importa.ce of removing wa.er in Mg ba.ed electrolytes. The a.dition ma.nesium di[bis(trifluorometha.esulfonyl)imide](Mg[TFSI]_2)(0.3 M) to N-butyl-n-methyl-pyrrolidinium bis(trifluorometha.esulfonyl)imide [C4 mpyr][TFSI]/tetra.lyme a. a.mole ra.io of 1:2 showed sta.le CV cycling over a.most 300 cycles while sca.ning electron microscopy(SEM) a.d X-ra. diffra.tion(XRD) confirmed Mg deposition, showing non-dendritic morphology a.d a.well-a.igned growth. Further thermogra.imetric a.a.ysis(TGa. demonstra.ed a.ma.s retention of 79% a. 250℃ for this electrolyte suggesting tha. the presence of the ionic liquid increa.es therma. sta.ility substa.tia.ly ma.ing these hybrid electrolytes compa.ible for RMBs.

关键词： Mg[TFSI]2 Ionic liquids Tetra.lyme Recha.gea.le Mg ba.tery Mg[BH4]2 dehydra.e rea.ent

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：