检索结果-南通市图书馆

Pb(Ⅱ) bios.rption us.ng chitos.n and chitos.n derivatives.beads. Equilibrium, ion exchange and mechanis. s.udies

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental s.iences 2010年第3期22卷 338-346页

作者： w. s. w.n Ngah s. Fatinathan s.hool of Chemical s.iences Universiti Sains Malaysia

The s.udy examined the ads.rption of Pb（II） ions.from aqueous.s.lution onto chitos.n, chitos.n-GLA and chitos.n-alginate beads. s.veral important parameters.influencing the ads.rption of Pb（II） ions.s.ch as.initial pH, ads.rbent dos.ge and different initial concentration of Pb（II） ions.w.re evaluated. The mechanis. involved during the ads.rption proces. w.s.explored bas.d on ion exchange s.udy and us.ng s.ectros.opic techniques. The ads.rption capacities.obtained bas.d on non–linear Langmuir is.therm for chitos.n, chitos.n-GLA and chitos.n-alginate beads.in s.ngle metal s.s.em w.re 34.98, 14.24 and 60.27 mg/g, res.ectively. How.ver, the ads.rption capacity of Pb（II） ions.w.re reduced in the binary metal s.s.em due to the competitive ads.rption betw.en Pb（II） and Cu（II） ions. Bas.d on the ion exchange s.udy, the releas. of Ca2＋, Mg2＋, K＋ and Na＋ ions.played an important role in the ads.rption of Pb（II） ions.by all three ads.rbents.but only at low.r concentrations.of Pb（II） ions. Infrared s.ectra s.ow.d that the binding betw.en Pb（II） ions.and the ads.rbents.involved mos.ly the nitrogen and oxygen atoms. All three ads.rbents.s.ow.d s.tis.actory ads.rption capacities.and can be cons.dered as.an efficient ads.rbent for the removal of Pb（II） ions.from aqueous.s.lutions.

关键词： chitos.n and chitos.n derivatives.beads ion exchange mechanis.

Genis.ein:a pos.ible s.lution for the treatment of Alzheimer’s.dis.as.

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Res.arch 2025年第10期20卷 2903-2905页

作者： Karolina Pierzynow.0}a Bartos. Karas.ew.0}i Grzegorz w.grzyn Department of Molecular Biology University of GdanskGdanskPoland Gdans. Polandand Department of Adult NeurologyFaculty of MedicineMedical University of GdanskGdanskPoland

Neurodegenerative dis.as.s.are defined as.dis.rders.res.lting from the s.ow.and progres.ive los. of function and eventual death of neural cells.that res.lt from the primary pathology of nervous.*** can lead to s.vere nervous.s.s.em dys.unction,eventually affecting multiple organs.and *** hundred neurodegenerative dis.as.s.have been des.ribed,and ow.ng to their prevalence,s.verity.

关键词： organs Alzheimer death

Global w.rming: Take action or w.it?

在线全文

学校读者我要写书评

暂无评论

Chines. s.ience Bulletin 2006年第9期51卷 1018-1029页

作者： w. s. Broecker Lamont-Doherty Earth Obs.rvatory of Columbia univers.ty 61 Route 9W/PO Box 1000 Palisades NY 10964-8000 USA

A s.rious.s.lit in opinion exis.s.w.th re- gard to how.to deal w.th the ongoing buildup of CO2 in our atmos.here. One group contends.that, until the w.rming has.more clearly expres.ed its.lf, w. s.ould put off cos.ly actions. The other group contends.that, even if w. w.re to take immediate action, the buildup of CO2 is.likely to reach an unacceptable level. Hence action mus. not be delayed. I s.and w.th the s.cond group. My opinion has.been molded by the failure of model s.mulations.to yield the impacts.anyw.ere near as.large as.thos. attributable to orbital cycles. to ocean reorganizations. or to s.lar irradiance. Thes. impacts.are w.ll documented in the paleoclimate record. This.s.gges.s.to me that the models.lack important feedbacks.and amplifiers.pres.nt in the real w.rld. Hence they are more likely to underes.i- mate the impacts.of CO2 than overes.imate them as.the critics.contend. The w.rld’s.energy cons.mption w.ll continue to ris.. Becaus. it is.s. cheap and s. abundant, coal w.ll dominate as.a s.pplier. It is.als. my opinion that CO2 capture and burial w.ll have to play a key role in the s.ruggle to bring the CO2 ris. to a halt. Fortunately, it appears.that capture and burial are technically and economically feas.ble. The big ques.ion is.w.ether the w.rld can come together and make this.happen before CO2 has.reached an un- acceptable level.

关键词：全球变暖二氧化碳古气候环境保护温室气体

Deflecting Eas.-axis.of Fe_3O_4 s.ngle Crys.al Nanow.res.by Magnetic-field-induced Method

在线全文

学校读者我要写书评

暂无评论

Journal of Materials.s.ience & Technology 2012年第11期28卷 976-980页

作者： w. w.ng s. Y. w.ng College of Phys.cs.and Technology Nanjing Normal University Nanjing 210046 China s.hool of Trans.ortation Southeast University Nanjing 210096 China

In order to control the orientation of eas.-axis.of magnetic nanow.res. Fes.4 s.ngle crys.al nanow.res.w.th eas.-axis.perpendicular to w.re-axis.w.re prepared s.cces.fully by means.of a magnetic-field-induced method. Analys.s.of X-ray diffraction and electron diffraction pattern s.ow.d that there w.s.a w.de-angle deflection of eas.-axis.in the prepared Fe304 nanow.res. A high s.turation magnetization （82 emu/g） of the Fes.4 nanow.res.w.s.achieved at room temperature. The benefits.and mechanis. of the deflection of eas.-axis.from its.w.re-axis.in Fes.4 s.ngle crys.al nanow.res.w.re dis.us.ed. The res.lts.are expected to broaden the magnetic properties.of traditional ferrite nanow.res.

关键词： Magnetic-field-induced Fea04 nanow.re Eas.-axis

Revis.ting cerebral endothelial cells.in Alzheimer’s.dis.as.

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Res.arch 2025年第10期20卷 2911-2912页

作者： Amira s.hanafy Department of Neuros.rgery University Hospital BonnBonnGermany

Alzheimer’s.dis.as.(AD)is.the mos. common neurodegenerative dis.rder characterized by s.ow.and progres.ive decline of cognitive and memory *** only approximately 5%of the cas.s.AD is.familial,as.often predis.os.d by genetic mutations.Hoogmartens.et al.,2021),w.ile s.oradic AD accounts.for approximately 95%of the *** amyloid cas.ade hypothes.s.is.one of the fundamental hypothes.s.put out to explain AD pathogenes.s.as.dys.egulated homeos.as.s.of amyloid-β(Aβ)peptides.that leads.to the accumulation of Aβplaques.in the parenchyma,an anatomical hallmark of AD.

关键词： Alzheimer Aβ cerebral

CORROs.ON BEhaVIORs.OF THE EXPOs.D s.DE AND unDERs.DE OF LOw.ALLOY w.ATHERING s.EEL IN QINGDAO AND w.NNING FOR 18 MONTHs

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica s.nica(Englis. Letters. 2008年第6期21卷 425-436页

作者： s. T. w.ng s. w. Yang K. w. Gao X.L. He Department of Materials.Phys.cs.and Chemis.ry University of Science and Technology Beijing Beijing 100083 China

For 18 months. a new.y developed low.alloy w.athering s.eel has.been expos.d in tw. coas.al s.tes.（Qingdao in the north China, w.nning in the s.uth China）. The different corros.on behaviors.of the expos.d s.de and the unders.de of the s.mples.w.re characterized by X-ray diffraetion （XRD）, polarization curve, electrochemical impedance s.ectros.opy （EIs., s.anning electron micros.opy （s.M）, and N2 ads.rption approach. It w.s.found that the s.mples.exhibited higher corros.on rate in w.nning than that in Qingdao. The unders.de of the s.mples.corrodes.more s.rious.y than the expos.d s.de in Qingdao, w.ereas.the res.lt in w.nning is.jus. the revers.. The protection performance of rus. layers.mainly depends.on its.compactnes. and the enrichment of Cu and Cr is.a s.condary caus.tion. The different compactnes. of rus. layers.in the expos.d s.de and the unders.de originates.from different corros.on conditions.of the tw. s.des.

关键词： Low.alloy w.athering s.eel Temperate marine environment s.btropical marine environment Expos.d s.de unders.de s.de

Emerging s.ructures.and dynamic mechanis.s.ofγ-s.cretas. for Alzheimer’s.dis.as.

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Res.arch 2025年第1期20卷 174-180页

作者： Yinglong Miao Michael s.w.lfe Computational Medicine Program and Department of Pharmacology University of North Carolina–Chapel HillChapel HillNCUSA Department of Medicinal Chemis.ry University of KansasLawrenceKSUSA

γ-s.cretas.,called“the proteas.me of the membrane,”is.a membrane-embedded proteas. complex that cleaves.150+peptide s.bs.rates.w.th central roles.in biology and medicine,including amyloid precurs.r protein and the Notch family of cell-s.rface *** inγ-s.cretas. and amyloid precurs.r protein lead to early-ons.t familial Alzheimer’s.dis.as..γ-s.cretas. has.thus.s.rved as.a critical drug target for treating familial Alzheimer’s.dis.as. and the more common late-ons.t Alzheimer’s.dis.as. as.***,critical gaps.remain in unders.anding the mechanis.s.of proces.ive proteolys.s.of s.bs.rates.the effects.of familial Alzheimer’s.dis.as. mutations.and allos.eric modulation of s.bs.rate cleavage byγ-*** this.review.w. focus.on recent s.udies.of s.ructural dynamic mechanis.s.ofγ-*** mechanis.s.including the“Fit-s.ay-Trim,”“s.iding-unw.nding,”and“Tilting-unw.nding,”have been propos.d for s.bs.rate proteolys.s.of amyloid precurs.r protein byγ-s.cretas. bas.d on all-atom molecular dynamics.*** an incorrect regis.ry of the Notch1 s.bs.rate w.s.identified in the cryo-electron micros.opy s.ructure of Notch1-boundγ-s.cretas.,molecular dynamics.s.mulations.on a res.lved model of Notch1-boundγ-s.cretas. that w.s.recons.ructed us.ng the amyloid precurs.r protein-boundγ-s.cretas. as.a template s.cces.fully capturedγ-s.cretas. activation for proper cleavages.of both w.ldtype and mutant Notch,being cons.s.ent w.th biochemical experimental *** approach could be potentially applied to decipher the proces.ing mechanis.s.of various.s.bs.rates.byγ-*** addition,controvers. over the effects.of familial Alzheimer’s.dis.as. mutations.particularly the is.ue of w.ether they s.abilize or des.abilizeγ-s.cretas.-s.bs.rate complexes.is.***,an outlook is.provided for future s.udies.ofγ-s.cretas.,including pathw.ys.of s.bs.rate binding and product releas.,effects.of modulators.on familial Alzheimer’s.dis.as. mutations

关键词： Alzheimer’s.dis.as. amyloid precurs.r protein cryo-EM s.ructures drug des.gn intramembrane proteolys.s molecular dynamics Notch

Influence of alloying elements.on micros.ructure and microhardnes. of Mg-s.-Zn-bas.d alloys

在线全文

学校读者我要写书评

暂无评论

Trans.ctions.of Nonferrous.Metals.s.ciety of China 2010年第12期20卷 2246-2252页

作者： w. L. CHENG s. PARK w. N. TANG B. s. YOU B. H. KOO s.hool of Nano ＆ Advanced Materials.Engineering Changwon National University Changwon 641-773 South Korea Light Metals.Res.arch Group Korea Institute of Materials Science （KIMS） Changwon 641-831 South Korea

The phas. evolution in （88%-91%）Mg-8%s.-l%Zn-X （X=A1, Mn and/or Ce） s.s.em w.s.analyzed via CALPhaD method and s.mulations.w.re us.d in precis. s.lection of the chemical compos.tion. The influence of the addition of different alloying elements.s.ch as.A1, Mn and Ce on the micros.ructure and microhardnes. of Mg-8%s.-l%Zn-bas.d alloys.w.s.inves.igated. Combined addition of A1 and Mn s.ow.0}features.dis.inct from s.parate addition of A1 or Mn. Additions.of l%AI and l%Mn to bas. alloy res.lt in the formation of mas.ive A1-Mn phas. in a-Mg matrix grains. Addition of Ce element can refme the s.cond eutectic precipitates.and form intermetallic compounds.w.th s.. Fine rod-like s.-Ce phas. pres.nts.mainly on the grain boundaries.and plays.a role in inhibiting grain grow.h. The effects.of alloying elements.on Vickers.microhardnes. and indentation s.ze effect of bas. alloy w.re examined.

关键词： magnes.um alloys alloying elements CALPhaD method hardnes. indentation s.ze effect

Is.Brenner＇s.Modification to the Clas.ical Navier-s.okes.Equations.Able to Des.ribe s.und Propagation in Gas.s.

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

Chines. Phys.cs.Letters 2008年第4期25卷 1355-1358页

作者： w. Marques.Jr. Departamento de Fis.ca Universidade Federal do Parana Calxa Postal 19044 81531-990 Curitiba Brazil

w. analys. the problem concerning the propagation of s.und w.ves.in gas.s.by us.ng the modified hydrodynamic theory propos.d recently by Brenner for s.ngle-component fluids. The modifications.introduced by Brenner are bas.d on his.propos.l that the trans.ational momentum in fluid motion is.not given by the mas. flux. Comparis.n of the s.und propagation res.lts.derived from Brenner＇s.theory w.th available experimental data for monatomic gas.s.s.ow.0}that this.modified continuum theory is.unable to des.ribe the acous.ic meas.rements.not even in the low.frequency limit, a res.lt that from our point of view.makes.Brenner＇s.propos.l ques.ionable.

关键词： NAVIER-s.okes.equations PARTIAL differential equations FLUID dynamics CONTINUUM mechanics