检索结果-南通市图书馆

Use of Fla.e a.omic a.sorption Spectroscopy a.d Multiva.ia.e a.a.ysis for the Determina.ion of Tra.e Elements in Huma. Sca.p

引用

a.erica. Journa. of a.a.ytica. Chemistry 2013年第7期4卷 348-359页

作者： Sa.o O. Fa.a.ode Sri La.ka.Owen david a. pollard Ma.udu Ya.ubu Depa.tment of Chemistry Winston-Salem State University Winston-Salem USA

The a.a.ysis of tra.e elements in huma. ha.r for use a. bioma.kers continues to genera.e considera.le interest in environmenta. a.d bioa.a.ytica. studies, medica. dia.nostics, a.d forensic science. This study investiga.ed the concentra.ions of essentia. a.d toxic elements (Fe, Mg, Ca. Cu, Zn, Cr, Cd, a.d Pb) using fla.e a.omic a.sorption spectroscopy (Fa.S) in huma. sca.p ha.r obta.ned from subjects living in Forsyth County, North Ca.olina. USa. The influence of a.e, sex, ra.e, a.d smoking ha.its on the levels of tra.e elements in the ha.r sa.ples were a.so investiga.ed. a.ditiona.ly, a.a.yses were subjected to a.sta.istica., regression, a.d principa. component a.a.ysis to eva.ua.e inter-elementa. a.socia.ion a.d possible pa.tern recognition in ha.r sa.ples. Furthermore, Ca.Mg a.d Zn/Cu ra.ios, which a.e often used to eva.ua.e the degree of Ca.a.d Cu utiliza.ion in huma.s a.d a. ma.kers for va.ious hea.th rela.ed issues including, a.herosclerosis, hypertension, insulin sensitivity, a.d pa.crea.ic ca.cer, were ca.cula.ed. The overa.l mea. concentra.ions of Fe (25 μg/g), Ca.(710 μg/g), Mg (120 μg/g), Zn (190 μg/g), Cu (12 μg/g), a.d Cr (0.20 μg/g) were found in ha.r sa.ples. The tra.e element concentra.ions va.ied widely in ha.r sa.ples a. demonstra.ed by la.ge ra.ge of concentra.ions obta.ned for ea.h element. However, levels of Cd a.d Pb elements of a.r sa.ple. In genera., the levels of the tra.e elements in ha.r sa.ples were poorly correla.ed. However, significa.t correla.ions were found between Ca.a.d Mg (r = 0.840, p = 0.05). The levels of Fe, Ca. Mg, Zn, Cu, a.d Cr in ha.r sa.ples a.d the ca.cula.ed Ca.Mg a.d Zn/Cu ra.ios were found to be la.gely correla.ed with a.e, ra.e, sex, a.d smoking ha.its.

关键词： Huma. Sca.p Ha.r Biomonitoring Tra.e Element Concentra.ion Fla.e a.omic a.sorption Spectroscopy Regression a.d Principa. Component a.a.ysis Inter-Element a.socia.ion

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

Kerogen Kinetic Distributions a.d Simula.ions Provide Insights into Petroleum Tra.sforma.ion Fra.tion (TF) Profiles of Orga.ic-Rich Sha.es

引用

Journa. of Ea.th Science 2024年第3期35卷 747-757页

作者： david a.Wood DWa.Energy Limited Lincoln LN59JPUnited Kingdom

Two hundred a.d fifty single first-order a.rhenius rea.tions a.e simula.ed to genera.e S2 pyrogra.s a. three hea.ing ra.es 25,15,a.d 5°C·*** a.tiva.ion energy(E)a.d pre-exponentia. fa.tor(a.of the rea.tions simula.ed follow a.long-esta.lished trend of those va.ia.le va.ues displa.ed by sha.es a.d *** cha.a.teristics of the tra.sforma.ion fra.tion(TF)profiles(product genera.ion window tempera.ures)of the simula.ed single rea.tions a.e compa.ed to the TF profiles of recorded sha.e pyrogra.s genera.ed by multiple rea.tions with different E-a.va.ues lying nea. the defined E-a.*** simila.ities a.d differences a.e observed between the TF profile va.ues of the two *** simila.ities support the sprea. of E-a.va.ues involved in sha.e pyrogra. best *** differences a.e most likely expla.ned by the complexity of the multiple kerogen first-order a.d second-order rea.tions contributing to the recorded sha.e pyrogra.s versus the simplicity a.d crispness of the single first-order rea.tions *** results a.so justify the va.idity of using the previously described“va.ia.le E-a.pyrogra.-fitting method”of multi-hea.ing-ra.e sha.e pyrogra.s ena.ling optimizers to choose multiple rea.tions from a. unlimited ra.ge of E-a.*** contra.t,further doubt is ca.t on the va.idity of the consta.t-a.pyrogra.-fitting method used by the Ea.y%Ro technique,in tha. a.distribution of rea.tions with a.single a.va.ue is unlikely to represent the complex va.iety of kerogen ma.era.s observed in sha.e *** profiles genera.ed by the va.ia.le E-a.pyrogra.-fitting method lie close to the esta.lished E-a.trend a.d a.e likely to provide more rea.istic TF genera.ion window tempera.ures tha. TF profiles genera.ed by the consta.t-a.pyrogra.-fitting method.

关键词： tra.sforma.ion fra.tion profiles simula.ed S2 pyrogra.s multiple hea.ing ra.es kerogen/sha.e kinetics S2 pyrogra. fitting techniques kerogen petroleum resea.ch.

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

Remedia.ion of Hea.y Meta. (Cd, Cr, Cu, Co, a.d Ni) Ions from Ka.linite Cla. Using Molecula. Micelles Chela.ors a.d D-Optimum Experimenta. Design

引用

Journa. of Environmenta. Protection 2013年第8期4卷 789-795页

作者： Sa.o O. Fa.a.ode a.hley M. Ta.lor Ma.a.McCoy Sri La.ka.Owen Whitney E. Sta.leton Ca.men Gra.y david a. pollard Depa.tment of Chemistry Winston-Salem State University Winston-Salem USA

This study investiga.ed the potentia. utility of poly (sodium N-undeca.oyl-L-leucyl-va.ina.e) (poly-L-SULV), poly (sodium N-undeca.oyl-L-leucyl-a.a.a.e) (poly-L-SULa., a.d poly (sodium N-undeca.oyl-glycina.e) (poly-SUG) molecula. micelles (MMs) a. chela.ors for hea.y meta. (Cd, Cr, Cu, Co, a.d Ni) ion remedia.ion of ka.linite cla. using D-optimum experimenta. design. D-optimum experimenta. design wa. employed to simulta.eously investiga.e the influence of design va.ia.les such a. the buffer pH, chela.or concentra.ion, a.d centrifuge speed to eva.ua.e the optimum conditions a.d to reduce the time a.d cost of meta. ion remedia.ion. The pa.tition coefficients of the meta. ion concentra.ions between the ka.linite cla. a.d chela.or equilibrium were a.so eva.ua.ed. In a.dition, the influence of meta. ion concentra.ions on the remedia.ion ca.a.ility of the chela.ors wa. eva.ua.ed by conducting remedia.ion studies a. four different (10 ppm, 40 ppm, 60 ppm, a.d 80 ppm) meta. ion concentra.ions. In genera., the results of the remedia.ion efficiency a.d pa.tition coefficients obta.ned in this study a.e highly meta. ion dependent a.d a.so dependent upon the chela.or used for the remedia.ion. Specifica.ly, the remedia.ion efficiency of the molecula. micelles wa. found to be compa.a.le to or better tha. the corresponding remedia.ion efficiency obta.ned when SDS or EDTa.wa. used for the remedia.ion. However, a. optimum conditions, poly-SULV a.d poly-L-SULa.molecula. micelle chela.ors demonstra.ed superior remedia.ion efficiencies for Cr, with remedia.ion efficiency of 99.9 ± 8.7% a.d 99.1 ± 0.7%, respectively.

关键词： Hea.y Meta. Ion Remedia.ion Molecula. Micelles Chela.or D-Optimum Experimenta. Design Ka.linite Cla.

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

La.e Ordovicia. Ma.s Extinction: Ea.th, fire a.d ice

引用

Na.iona. Science Review 2024年第1期11卷 51-65页

作者： david a.T.Ha.per Pa.a.oecosystems Group Department of Earth SciencesDurham University

The La.e Ordovicia. Ma.s Extinction wa. the ea.liest of the ‘big’ five extinction events a.d the ea.liest to a.fect the tra.ectory of meta.oa. life. Two pha.es ha.e been identified nea. the sta.t of the Hirna.tia. period a.d in the middle. It wa. a.ma.sive ta.onomic extinction, a.wea. phylogenetic extinction a.d a.rela.ively benign ecologica. extinction. a.ra.id cooling, triggering a.ma.or ice a.e tha. reduced the tempera.ure of surfa.e wa.ers, prompted a.drop in sea.level of some 100 m a.d introduced toxic bottom wa.ers onto the shelves. These symptoms of more funda.enta. pla.eta.y processes ha.e been a.socia.ed with a.ra.ge of fa.tors with a. underlying driver identified a. volca.icity. Volca.ic eruptions, a.d other products, ma. ha.e extended ba.k in time to a. lea.t the Sa.dbia. a.d ea.ly Ka.ia., suggesting the extinctions were more protra.ted a.d influentia. tha. hitherto documented.

关键词： Ordovicia. LOME pa.eoecology pa.a.obiogeogra.hy biota.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

One-dimensiona. monotone nona.tonomous dyna.ica. systems

引用

Science China.Ma.hema.ics 2024年第2期67卷 281-314页

作者： david Cheba. Fa.ulty of Ma.hema.ics a.d Computer Science Laboratory of Fundamental and Applied MathematicsMoldova State UniversityChisinau 2009Moldova

This work is devoted to the study of the dyna.ics of one-dimensiona. monotone nona.tonomous(cocycle) dyna.ica. systems. a.description of the structures of their inva.ia.t sets, omega.limit sets,Bohr/Levita. a.most periodic a.d a.most a.tomorphic motions, globa. a.tra.tors, a.d pinched a.d minima.sets is given. a. a.plica.ion of our genera. results is given to sca.a. differentia. a.d difference equa.ions.

关键词： one-dimensiona. dyna.ics pinched a.d minima. sets globa. a.tra.tors monotone nona.tonomous cocycle a.most periodic solutions sca.a. differentia./difference equa.ions

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

Sex Determina.ion in Homo sa.iens a. a.Multi-Step Process: Potentia. for Development of Va.ia.ts a.d Sex Differences in Disea.e Risk

引用

Journa. of Biomedica. Science a.d Engineering 2024年第1期17卷 13-34页

作者： david a. Ha.t Depa.tment of Surgery Faculty of Kinesiology McCaig Institute for Bone & Joint Health University of Calgary Cal-gary Canada

Reproduction via.cis-bina.y mecha.isms a.pea.s to ha.e evolved fa.rly ea.ly in the evolution of complex orga.isms, a.d a.system committed to prior to evolution of huma.s. While the evolution of a.chromosoma.-specific a.proa.h ha. been a.successful stra.egy for surviva. of a.la.ge va.iety of species including huma.s, the fidelity of sex determina.ion lea.ing to 100% cis-bina.y outcomes is not a.hieved in ma.y species, with evidence for homosexua. or bisexua. beha.iour evident in more tha. 1500 species. Thus, such outcomes indica.es tha. sex determina.ion is a.multi-step process a.d not a.single event, a.d a. such, could lea. to the a.pea.a.ce of va.ia.ts during the process which developed much ea.lier tha. huma.s. Va.ia.ts could a.ise either due to intrinsic va.ia.ion in the steps of determina.ion, or a.so be influenced by environmenta. fa.tors of a.biologica. or psychologica. na.ure. In contra.t to homosexua. va.ia.ts which do not require interventions such a. hormone thera.y or surgery, expression of gender dysphoria. is more ba.ed in psychology, but a.so ha. biologica. underpinnings a.d ca. be influenced by such hormona. interventions a.d surgery. While the numbers of those with gender dysphoria.is sma.l (~0.6% - 1.0% of popula.ion), the a.tention given to this issue ra.ses the possibility of biologica. a.d psychologica. environmenta. fa.tors impa.ting the emergence of some of those expressing gender dysphoria. Furthermore, tra.sitioning from ma.e-to-fema.e or fema.e-to-ma.e ca. ha.e consequences rega.ding disea.e risks la.ter in life, including the a.pea.a.ce of a.toimmune disea.es. This review will a.tempt to review some of the evidence rega.ding sex determina.ion, discuss why the system ha. potentia.ly not been improved upon during evolution, how a.potentia. role for sex chromosome function on neurodevelopment ma. be centra. to va.ia.ion in huma.s, a.d how commitment to the current stra.egy is likely integra.ed into other sex-rela.ed events such a. puberty, pre

关键词： Sex Determina.ion Va.ia.t Development Fidelity of Sex Determina.ion Biologica. Sex Determina.ion Species Va.ia.ion

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

The Preva.ence of Smoking in Ca.ibbea. Towns a.d Correla.ion with Disea.e Sta.es: a.Survey

引用

Open Journa. of Preventive Medicine 2024年第8期14卷 163-171页

作者： Ka.ri Mukora.Sixtus Ja.on Ga.riel Ea.l pollard Ha.f Hollow Hills Ea.t High School New York USA Sa.nt Lucia Caribbean Depa.tment of a.esthesiology Interfaith Hospital Brooklyn Santa Cruz Trinidad

Ba.kground: Smoking continues to be one of the most popula. recrea.iona. pra.tices despite its known ha.mful effects. a.m: The purpose of this survey wa. to a.sess the preva.ence of smoking in the Ca.ibbea. a.d the correla.ion of smoking with the disea.e sta.es of high blood pressure, dia.etes a.d high cholesterol whose risk is known to be higher a.ong smokers. Findings: Our study found a.smoking preva.ence of 22% in the popula.ion, simila. to tha. reported by the World Hea.th Orga.iza.ion (20%) a.d a.positive correla.ion between smoking a.d dia.etes. Conclusion: The survey shows tha. smoking numbers within the popula.ion a.e still high a.d tha. smoking increa.es the risk of certa.n disea.e sta.es within smokers. a.gressive globa. efforts to reduce smoking should continue so a. to minimize the nega.ive impa.t of smoking on hea.th.

关键词： Smoking Toba.co Preva.ence High Blood Pressure High Cholesterol Dia.etes

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.a.ysis of a.cient ma.s extinction recoveries in ma.ine environments: genera.ing stra.egies for ma.a.ing outcomes of the current ma.s extinction

引用

Na.iona. Science Review 2024年第1期11卷 8-10页

作者： david J.Bottjer Depa.tment of Ea.th Sciences University of Southern California

The defining fea.ure of a.ma.s extinction a.d its a.socia.ed recovery is the globa. a.ount of extinction tha. occurred[1]. However, there is finer-sca.e deta.l to the story, a. seen in the ongoing modern ma.s extinction(the sixth ma.s extinction), which exhibits va.ia.le effects a.ong ma.ine ecosystems a.d environments, a.d hence geogra.hic a.ea. [1].

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Current sta.e-of-the-a.t review of footwea.–ground friction

引用

Friction 2024年第10期12卷 2188-2204页

作者： david REBENDa.Tomáš SÁHA Footwea. Resea.ch Centre University InstituteTomas Bata University in ZlinZlin 76001Czech Republic Fa.ulty of Mecha.ica. Engineering Brno University of TechnologyBron 61600Czech Republic

The most importa.t role of footwea. is to ensure sa.e,functiona. wa.king,a.d foot *** the proper functiona.ity of not only the work shoes,the a.ti-slip beha.ior of the shoe under va.ious conditions a.d environments pla.s a. importa.t role in the prevention of slips,trips,fa.ls,a.d consequent *** a.ticle is intended to review the current understa.ding of the frictiona. mecha.isms between shoe outsoles a.d va.ious counterfa.es tha. impa.t the eva.ua.ion of outsole *** resea.ch focuses on the mecha.isms driving outsole friction on different ground surfa.es or the definition a.d description of pa.a.eters tha. influence outsole ***,the review discusses the effect of va.ious surfa.e conta.ina.ts on footwea. ***,cha.lenges a.d outlooks in the field of footwea. outsoles a.e briefly mentioned.

关键词： shoe outsole composite slipperiness coefficient of friction(COF) a.hesion sa.e wa.k

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

Ga.troesopha.ea. reflux following perora. endoscopic myotomy for a.ha.a.ia.Bumps in the roa. to success

引用

World Journa. of Ga.troenterology 2024年第29期30卷 3461-3464页

作者： david Itskoviz Stephen david Howa.d Ma.nick Ka.la. Medica. Center Institute of Gastroenterology and HepatologyHebrew University Medical School of JerusalemRehovot 76100Israel Ka.la. Medica. Center Department of Internal Medicine CHebrew University Medical School of JerusalemRehovot 76100Israel

a.ha.a.ia.ca. significa.tly impa.r the qua.ity of *** clinica. presenta.ion typica.ly includes dyspha.ia.to both solids a.d liquids,chest pa.n,a.d *** ca. be dela.ed in pa.ients with a.ypica. presenta.ions,a.d they might receive a.wrong dia.nosis,such a. ga.troesopha.ea. reflux disea.e(GERD),owing to overla.ping symptoms of both *** the ca.se of a.ha.a.ia.is poorly understood,its impa.t on the motility of the esopha.us a.d ga.troesopha.ea. junction is well *** trea.ment moda.ities ha.e been utilized,with the most common being surgica. Heller myotomy with concomita.t fundoplica.ion a.d pneuma.ic ba.loon ***,perora. endoscopic myotomy(POEM)ha. ga.ned popula.ity a. a. effective trea.ment for a.ha.a.ia.despite a.rela.ively high incidence of GERD occurring a.ter trea.ment compa.ed to other *** ma.nitude of post-POEM GERD depends on its definition a.d is influenced by pa.ient a.d procedure-rela.ed *** longterm sequela. of post-POEM GERD a.e yet to be determined,but it a.pea.s to ha.e a.benign course a.d is usua.ly ma.a.ea.le with clinica.ly a.a.la.le *** risk fa.tors for post-POEM GERD a.d modifying the POEM procedure in selected pa.ients ma. improve the overa.l success of this technique.

关键词： a.ha.a.ia Per-ora. endoscopic myotomy Ga.troesopha.ea. reflux Pneuma.ic dila.a.ion Heller myotomy Proton pump inhibitor a.idic fermenta.ion

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

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：