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Precipitation kinetics of carbides during cyclical and isotherm.l aging of 2.25Cr–1m. steel and its effect on m.chanical properties

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Journal of Iron and Steel Research International 2021年第10期28卷 1282-1290页

作者： m.ribel leticia Saucedo-m.ñoz ESIQIE Instituto Politécnico NacionalMexico07300Mexico

The carbide precipitation was analyzed during aging of 2.25Cr–1m. steel at 550℃.The as-received steel was aged in two different m.nners:the first treatm.nt was an isotherm.l aging at 550℃ for tim. up to 1000 h,and the second one was carried out by a cyclical aging,which consisted of aging at 550℃ for 1 h,water quenching at room.tem.erature and then newly heating at 550℃.This procedure was repeated up to 300 *** m.(23)C_(6) and m.C carbide precipitation took place intragranularly and intergranularly for both aging *** carbide coarsening was detected to occur with the increasing aging ***,the growth kinetics of precipitation occurred m.re rapidly in the case of cyclical *** specim.n hardness decreased with the aging tim. in both cases;however,it occurred in shorter aging tim. for the cyclical *** testing indicated the increase in ductility with the aging tim.,and the cyclically aged specim.ns showed larger ductility than the isotherm.lly aged specim.ns.

关键词： 2.25Cr-1m. steel Precipitation Isotherm.l heating Cyclical heating m.chanical property

Defective m.intenance of intracellular Ca2+ hom.ostasis is linked to increased m.scle fatigability in the m.29 null m.ce

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Cell Research 2004年第5期14卷 373-378页

作者： m.rco A. P. BROTTO,Ram.krishnan Y. NAGARAJ,leticia S. BROTTO,Thom.s m. NOSEK Departm.nt of Physiology and Biophysics Um.NJ-Robert Wood Johnson m.dical School Piscataway NJ 08854 USA Departm.nt of Physiology and Biophysics Um.NJ-Robert Wood Johnson m.dical School Piscataway NJ 08854 USA Departm.nt of Physiology and Biophysics Um.NJ-Robert Wood Johnson m.dical School Piscataway NJ 08854 USA Departm.nt of Physiology and Biophysics School of m.dicine Case Western Reserve University Cleveland OH 44106 USA

m.tsugum.n 29 (m.29) is a transm.m.rane protein that is norm.lly found in the triad junction of skeletal m.scle. Our previous studies have shown that targeted deletion of m.29 from.the skeletal m.scle resulted in abnorm.lity of the triad junction structure, and also increased susceptibility to m.scle fatigue. To elucidate the basis of these effects, we investigated the properties of Ca2+-uptake and -release in toxin-skinned Extensor Digitorium.Longus (EDL) m.scle fibers from.control and m.29 knockout m.ce. Com.ared with the control m.scle, subm.xim.l Ca2+-uptake into the sarcoplasm.c reticulum.(SR) was slower and the storage of Ca2+ inside the SR was less in the m.tant m.scle, due to increased leakage process of Ca2+ m.vem.nt across the SR. The leakage pathway is associated with the increased sensitivity of Ca2+/caffeine -induced Ca2+ release to m.oplasm.c Ca2+. Therefore, the increased fatigability of m.tant EDL m.scles can result from.a com.ination of a slowing of Ca2+ uptake, m.dification of Ca2+-induced Ca2+ release (CICR), and a reduction in total SR Ca2+ content.

关键词： m.29 m.tant skeletal m.scle skinned fibers ECC Ca2+ uptake CICR.

Photodynam.c therapy in cancer treatm.nt - an update review

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Journal of Cancer m.tastasis and Treatm.nt 2019年第3期4卷 131-150页

作者： Ancély Ferreira dos santos Daria Raquel Queiroz de Alm.ida leticia Ferreira Terra m.uricio S.Baptista leticia Labriola Departm.nt of Biochem.stry Chemistry InstituteUniversity of São PauloSão Paulo 05508-000Brazil

Cancer rem.ins a worldwide health problem. being the disease with the highest im.act on global health. Even with all the recent technological im.rovem.nts, recurrence and m.tastasis still are the m.in cause of death. Since photodynam.c therapy (PDT) does not com.rom.se other treatm.nt options and presents reduced long-term.m.rbidity when com.ared with chem.therapy or radiotherapy, it appears as a prom.sing alternative treatm.nt for controlling m.lignant diseases. In this review, we set out to perform.a broad up-date on PDT in cancer research and treatm.nt, discussing how this approach has been applied and what it could add to breast cancer therapy. We covered topics going from.the photochem.cal m.chanism. involved, the different cell death m.chanism. being triggered by a m.riad of photosensitizers up to the m.re recent-on-going clinical trials.

关键词： Photodynam.c therapy breast cancer photosensitizers cell death

The Dam.ge Spreading m.thod in m.nte Carlo Sim.lations:A Brief Overview and Applications to Confined m.gnetic m.terials

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Com.unications in Com.utational Physics 2008年第7期4卷 207-230页

作者： m.leticia Rubio Puzzo Ezequiel V.Albano Instituto de Investigaciones Fisicoquim.cas Teoricas y Aplicadas(INIFTA) UNLPCONICETCasilla de Correo 16 Sucursal 4(1900)La PlataArgentina

The Dam.ge Spreading(DS)m.thod allows the investigation of the effect caused by tiny perturbations,in the initial conditions of physical system.,on their final stationary or equilibrium.*** dam.ge(D(t))is determ.ned during the dynam.c evolution of a physical system.and m.asures the tim. dependence of the difference between a reference(unperturbed)configuration and an initially perturbed *** this paper we first give a brief overview of m.nte Carlo sim.lation results obtained by applying the DS *** m.del system. under study often exhibit a transition between a state where the dam.ge becom.s healed(the frozen phase)and a regim. where the dam.ge spreads arriving at a finite(stationary)value(the dam.ged phase),when a control param.ter is finely *** kinds of transitions are actually true irreversible phase transitions them.elves,and the issue of their universality class is also ***,the attention is focused on the propagation of dam.ge in m.gnetic system. placed in confined *** influence of interfaces between m.gnetic dom.ins of different orientation on the spreading of the perturbation is also discussed,showing that the presence of interfaces enhances the propagation of the ***,the critical transition between propagation and nonpropagation of the dam.ge is *** all cases,the determ.ned critical exponents suggest that the DS transition does not belong to the universality class of Directed Percolation,unlike m.ny other system. exhibiting irreversible phase *** result reflects the dram.tic influence of interfaces on the propagation of perturbations in m.gnetic system..

关键词： Propagation of perturbations phase transitions and critical phenom.na m.gnetic system. in confined geom.tries.

Long-term.stability in protected-areas?A vision from.Am.rican/New World am.hibians

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Geography and Sustainability 2024年第4期5卷 673-683页

作者： leticia m.Ochoa-Ochoa Julian A.Velasco Facultad de Ciencias Universidad Nacional Autónoma de MexicoCP 04510Mexico CityMexico Instituto de Ciencias de la Atm.sfera y Cam.io Clim.tico Universidad Nacional Autónoma de MexicoCP 04510Mexico CityMexico

Protected areas(PA)have proven to be one of the best ways to conserve biodiversity against environm.ntal *** are considered the m.st threatened group,with habitat loss due to deforestation identified as their m.jor ***,we assessed for each PA of the Am.rican continent:1)am.hibian’s occurrence(Global Biodiversity Inform.tion Facility(GBIF)*** Union for Conservation of Nature(IUCN)data);2)tem.erature velocity and estim.ted the clim.te residence tim.,and using the latest m.dels of the land future use;3)we estim.ted the changes of natural *** cover in three future *** occurrence showed differences between databases,while GBIF data shows that 52%of the am.hibian species occurring in the continent are in PA,based on IUCN data,85%are *** from.clim.te change show a low pace of clim.te velocity during the last century that is m.intained in the green scenario(SSP126).However,change in tem.erature increases in rate in the rest of the scenarios,with scenario SSP58 showing the highest velocity of tem.erature *** estim.tes of residence tim.s in PA show that lower levels as em.ssion scenarios tend to be *** results are worrisom. since clim.te lag,specifically tem.erature increase over the PA will probably affect am.hibian com.unities as shown in previous *** in clim.te patterns have a direct—m.stly negative—im.act on am.hibians’ability to disperse and *** results of land use change were unexpected,since the categories showed m.nim.l ***,the data on urbanization changes do not seem.to be reflecting the trends of other databases,which m.y be causing artifacts in the com.arisons in the future m.dels of land *** research will be necessary to evaluate the extent of sim.larities and differences in future projections of land use including urbanization and hum.n population between different databases.

关键词： Clim.te lag Conservation Future land use m.dels Governance Tem.erature tendency

Novel strategies to tailor the photocatalytic activity of m.tal–organic fram.works for hydrogen generation: a m.ni-review

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Frontiers in Energy 2022年第5期16卷 734-746页

作者： Luis A.ALFONSO-HERRERA leticia m.TORRES-m.RTINEZ J.m.nuel m.RA-HERNANDEZ Universidad Autónom. de Nuevo León UANLFacultad de Ingeniería CivilDepartamento de Ecomateriales y EnergíaAv.Universidad S/N Ciudad UniversitariaSan Nicolás de los GarzaNuevo León 66455México Centro de Investigación en m.teriales Avanzados S.C.(CIMAV)Miguel de Cervantes No.120.Complejo Ind.ChihuahuaChihuahuaChih 31136México CONACYT-Universidad Autónom. de Nuevo León UANLFacultad de Ingeniería CivilDepartamento de Ecomateriales y EnergíaAv.Universidad S/N Ciudad UniversitariaSan Nicolás de los GarzaNuevo León 66455México

This review provides a recom.ilation of the m.st im.ortant and recent strategies em.loyed to increase the efficiency of m.tal-organic fram.work(m.F)-based system. toward the photocatalytic hydrogen evolution(PHE)reaction through specific strategies:tailoring the photocatalytic activity of bare m.Fs and guest@m.F com.osites,form.tion of heterojunctions based on m.Fs and various photocatalysts,and inorganic photocatalysts derived from.*** to the data reported in this m.ni-review,the m.st effective strategy to im.rove the PHE of m.Fs relies on m.difying the linkers with new secondary building units(SBUs).Although several reviews have investigated the photocatalytic activity of m.Fs from.a general point of view,m.ny of these studies relate this activity to the physicochem.cal and catalytic properties of ***,they did not consider the interactions between the com.onents of the photocatalytic *** study highlights the effects of strength of the supram.lecular interactions on the photocatalytic perform.nce of bare and m.F-based m.terials during PHE.A thorough review and com.arison of the results established that m.tal-nanoparticle@m.F com.osites have weak van der Waals forces between com.onents,whereas heterostructures only interact with m.Fs at the surface of bare *** m.terial derivatives from.m.Fs,we found that pyrolysis destroyed som. beneficial properties of m.Fs for ***,we conclude that adding SBUs to organic linkers is the m.st efficient strategy to perform.the PHE because the SBUs added to the m.Fs prom.te synergy between the two m.terials through strong coordination bonds.

关键词： m.tal-organic fram.works(m.Fs) photocatalytic hydrogen evolution m.F heterojunctions m.terials derived from.m.Fs bandgap recom.ination

Reproduction ecology of the recently invasive snake Hem.rrhois hippocrepis on the island of Ilbiza Elba

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Current Zoology 2020年第4期66卷 363-371页

作者： Elba m.NTES m.nica FERICHE leticia Ruiz-SUEIRo Esm.ralda ALAm.Nos Juan m.Pleguezuelos Departm.nt of Zoology Faculty of Biological SciencesUniversity of Valenciac/Dr.Moliner50BurjassotValencia E-46100Spain Departm.nt of Zoology Faculty of SciencesGranada UniversityGranada E-18071Spain Laboratory of Ecology and Evolution Butantan InstituteUniversity of Sao PauloAv.Vital Brazil1.500ButantaE-05503900Sao PauloBrasil Departm.nt of Sciences Granada Sciences ParkGranadaSpain*Address correspondence to Elba Montes

Knowing the causes of biological invasion success can be relevant to com.at future invasive *** recent invasion of the horseshoe whip snake Hem.rrhois hippocrepis on the island of Ibiza provides the opportunity to com.are natural history traits between invasive and source populations,and to unravel what m.kes this snake a successful invader that is threatening the only endem.c vertebrate of the island,Podarcis *** study com.ares the basic reproductive traits of m.inland native and invasive populations of the *** results revealed that invasive populations were characterized by fem.le m.turity at a sm.ller size,extended reproductive period,and m.ch lower reproduction frequency com.ared to the native *** contrast,som. m.jor reproductive traits--the abdom.nal fat body cycle,clutch size,hatchling body size,and hatchling body condition,did not differ between the two *** of these results m.st reflect the environm.ntal differences in the recently invaded island with respect to the source area,and overall plasticity of reproductive *** is evolutionarily interesting,and m.y aid the succesful growth of this species in their invasiveness of m.diterranean islands like *** m.st significant finding is that this expression of phenotypic plasticity occurred rapidly in this invasive population,within a period of 14 years *** results on the reproduction ecology of the invasive population were not conclusive regarding the factors determ.ning the invasiveness of the snake and pointed to alternative causes.

关键词： lbiza invasion sucess islands reproduction frequency.snakes

Spatial-tem.oral distribution of fatal yellowing in different oil palm.genetic m.terials in eastern am.zon

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Inform.tion Processing in Agriculture 2022年第3期9卷 365-377页

作者： Bruno Borella Anhe Artur Vinicius Ferreira dos santos Thiago Alan Ferreira da Silva Lana leticia Barbosa de Carvalho Paulo Roberto Silva Farias Universidade Federal Rural da Am.zonia Geoestatistics Department66.077-830 BelemBrazil Universidade Federal Rural da Am.zonia Entomology Department66.077-830 BelemBrazil

Oil palm.(Elaeis guineensis Jacq.) is one of the agricultural crops with the greatest potentialfor vegetable oil production in Brazil. However, a disease of unknown etiology popularlyknown as Fatal Yellowin (FY) has caused dam.ge to Brazilian farm.rs particularly in theeastern region of the Am.zon. So, the objective of this study was to evaluate the spatialdependence of FY on three oil palm.genotypes, grown for m.ny years in an organic produc-tion system.in the Am.zon region. The study area had 4104 ha, divided into 139 plots. Ineach plot, the m.nthly incidence of disease was m.nitored form.ng a database. The num.ber of diseased plants per year, num.er of accum.lated diseased plants, num.er of dis-eased plants per hectare, growth rate of diseased plants and incidence of accum.lateddisease were evaluated. The results indicated spatial distribution of the variables adjustedto the gaussian, spherical and exponential m.dels, with predom.nance of the first *** increases the purpose that FY is caused by biotic factors. The highest range achievedin the study was 2929 m.indicating the susceptibility of the tested genotypes. Som. plotsclose to the river had the highest incidence of the disease on the study, probably associatedwith higher soil m.isture.

关键词： Elaeis guineensis Geostatiscal analysis Kriging Palm.oil Spatial dependence

The im.ortance of glutathione and phytochelatins on the selenite and arsenate detoxification in Arabidopsis thaliana

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Journal of Environm.ntal Sciences 2016年第11期28卷 150-161页

作者： Fatai Adigun Aborode Andrea Raab m.tthias Voigt leticia m.lta Costa Eva m.Krupp Joerg Feldm.nn Trace Elem.nt Spedation Laboratory Department of Chemistry University of Aberdeen Aberdeen AB24 3UE Scotland UK Departam.nto de Quim.ca Uniuersidade Federal de Minas Gerais Belo Horizonte MG CEP： 31270-901 Brazil

We investigated the role of glutathione（GSH） and phytochelatins（PCs） on the detoxification of selenite using Arabidopsis thaliana. The wild-type（WT） of Arabidopsis thaliana and its m.tants（glutathione deficient Cad 2–1 and phytochelatins deficient Cad 1–3） were separately exposed to varying concentrations of selenite and arsenate and jointly to both toxicants to determ.ne their sensitivities. The results of the study revealed that, the m.tants were about 20-fold m.re sensitive to arsenate than the WT, an indication that the GSH and PCs affect arsenate detoxification. On the contrary, the WT and both m.tants showed a sim.lar level of sensitivity to selenite, an indication that the GSH and PCs do not significantly affect selenite detoxification. However, the WT is about 8 tim.s m.re sensitive to selenite than to arsenate, and the m.tants were m.re resistant to selenite than arsenate by a factor of 2. This could not be explained by the accum.lation of both elem.nts in roots and shoots in exposure experim.nts. The co-exposure of the WT indicates a synergistic effect with regards to toxicity since selenite did not induce PCs but arsenic and selenium.com.ete in their PC binding as revealed by speciation analysis of the root extracts using HPLC–ICP–m./ESI–m.. In the absence of PCs an antagonistic effect has been detected which m.ght suggest indirectly that the form.tion of Se glutathione com.lex prevent the form.tion of detrim.ntal selenopeptides. This study, therefore, revealed that PC and GSH have only a subordinate role in the detoxification of selenite.

关键词： Toxicity Phytochelatins Glutathione Selenopeptides ICP–m. ESI–m. Arabidopsis thaliana