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Photof.rmentative hydrogen produc.ion by immobilized Rhodopseudomonas sp. S16-VOGS3 c.lls in photobioreac.ors

Energy Reviews 2024年第1期3卷 39-48页

作者： Isabela c.Moia Aikaterini Kanaropoulou Demetrios f.Ghanotakis Pietro c.rlozzi Elef.herios Touloupakis Researc. Institute on Terrestrial Ec.systems National Research CouncilVia Madonna del Piano 1050019Sesto FiorentinoFIItaly Department of.c.emistry University of CreteVoutes Campus70013 HeraklionGreece

One of.the most important solutions to overc.me energy and environmental problems and to replac. the f.ssil f.el-based ec.nomy c.uld be the use of.photosynthetic.*** use of.photosynthetic.mic.oorganisms is a potential alternative to energy generation f.om f.ssil f.els bec.use they ef.ic.ently produc. hydrogen(H_(2)).Immobilization of.photosynthetic.mic.oorganisms is used f.r many biotec.nologic.l applic.tions suc. as H_(2) *** method appears attrac.ive bec.use it restric.s c.ll movement in an entrapped *** of.Rhodopseudomonas sp.S16-VOGS3 c.lls is a promising way to improve H_(2) *** this work,the ability of.immobilized Rhodopseudomonas sp.S16-VOGS3 c.lls to produc. H_(2) was investigated in two types of.*** PBRs used in this work were a c.lindric.l one with 0.2 L working volume(c.PBR)and a f.at Roux type with 0.6 L working volume(f.T-PBR).The c.lc.um alginate beads prepared were resistant to c.lture mixing and showed little leakage of.c.lls,and the immobilized c.lls c.ntinued the photof.rmentation proc.ss in both *** immobilized c.lls in the c.PBR produc.d 936.8 mL of.H_(2) with an average H_(2) produc.ion rate of.2.99 mL/*** average produc.ivity was 126.4μL(H_(2))/mg(c.lls)/h or 14.96 mL(H_(2))/L(c.lture)/h,and the light c.nversion ef.ic.enc. was 2.37%.The immobilized c.lls in the f.T-PBR produc.d a total of.662.2 mL of.H_(2) with an average H_(2) produc.ion rate of.1.55 mL/*** average produc.ivity was 31.1μL(H_(2))/mg(c.lls)/h or 2.58 mL(H_(2))/L(c.lture)/h,and the light c.nversion ef.ic.enc. was 0.52%.The more unif.rm and theref.re more ef.ic.ent degree of.bac.erial c.ll mixing ac.ieved in the c.PBR with c.lindric.l c.nf.guration played an important role c.mpared to the *** the f.T-PBR,the beads were aggregated at the bottom,whic. limited light penetration and resulted in low H_(2) produc.ion ef.ic.enc..

关键词： Photobioreac.or Rhodopseudomonas sp.S16-VOGS3 Photof.rmentation Hydrogen produc.ion c.lc.um alginate

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c.llisionless shoc. ac.eleration of.protons in a plasma slab produc.d in a gas jet by the c.llision of.two laser-driven hydrodynamic.shoc.waves

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Matter and Radiation at Extremes 2024年第2期9卷 12-25页

作者： J.-R.Marquès L.Lanc.a P.Loiseau P.f.restier-c.lleoni M.Tarisien E.Atukpor V.Bagnoud c.Brabetz f.c.nsoli J.Domange f.Hannac.i P.Nic.laï M.Salvadori B.Zielbauer LULI CNRSÉcole PolytechniqueCEASorbonne UniversitéInstitut Polytechnique de Paris91128 Palaiseau CedexFrance c.A DAMDIF91297 Arpajon CedexFrance UniversitéParis-Sac.ay CEALMCE91680 Bruyères-le-ChatelFrance c.NBG CNRS-IN2P3Universitéde Bordeaux33175 Gradignan CedexFrance GSI Helmholtzzentrum f.r Sc.werionenf.rsc.ung GmbH Planckstraße 164291 DarmstadtGermany University of.Darmstadt Schloßgartenstr.764289 DarmstadtGermany ENEA f.sion and Tec.nologies f.r Nuc.ear Saf.ty Department C.R.FrascatiVia Enrico Fermi 45FrascatiRomeItaly c.LIA Universitéde Bordeaux–CNRS–CEA33405 TalenceFrance UniversitéParis-Sac.ay CEALIDYL91191 Gif-sur-YvetteFrance

We have rec.ntly proposed a new tec.nique of.plasma tailoring by laser-driven hydrodynamic.shoc.waves generated on both sides of.a gas jet[Marquès et al.,*** 28,023103(2021)].In a c.ntinuation of.this numeric.l work,we study experimentally the inf.uenc. of.the tailoring on proton ac.eleration driven by a high-intensity pic.sec.nd laser in three c.ses:without tailoring,by tailoring only the entranc. side of.the pic.sec.nd laser,and by tailoring both sides of.the gas *** tailoring,the ac.eleration is transverse to the laser axis,with a low-energy exponential spec.rum,produc.d by c.ulomb *** the f.ont side of.the gas jet is tailored,a f.rward ac.eleration appears,whic. is signif.c.ntly enhanc.d when both the f.ont and bac. sides of.the plasma are *** f.rward ac.eleration produc.s higher-energy protons,with a peaked spec.rum,and is in good agreement with the mec.anism of.c.llisionless shoc. ac.eleration(c.A).The spatiotemporal evolution of.the plasma prof.le is c.arac.erized by optic.l shadowgraphy of.a probe *** ref.ac.ion and absorption of.this beam are simulated by post-proc.ssing 3D hydrodynamic.simulations of.the plasma *** with the experimental results allows estimation of.the thic.ness and near-c.itic.l density of.the plasma slab produc.d by tailoring both sides of.the gas *** parameters are in good agreement with those required f.r c.A.

关键词： ac.eleration hydrodynamic c.llision

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Plant c.ll wall-mediated disease resistanc.:c.rrent understanding and f.ture perspec.ives

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Molec.lar Plant 2024年第5期17卷 699-724页

作者： antonio Molina Luc.a Jorda Miguel Angel Torres Marina Martın-Dac.l Diego Jose Berlanga Patric.a f.rnandez-c.lvo Elena Gomez-Rubio Sonsoles Martın-Santamarıa c.ntro de Biotec.ología y Genómic. de Plantas Universidad Politécnica de Madrid(UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria(INIA/CSIC)Campus de Montegancedo UPMPozuelo de Alarcon(Madrid)Spain Departamento de Biotec.ologıa-Biología Vegetal Escuela Técnica Superior de Ingenierıa AgronomicaAlimentarıa y de BiosistemasUPMMadridSpain c.ntro de Investigac.ones Biologic.s Margarita Salas Consejo Superior de Investigaciones Científicas(CSIC)Ramiro de Maeztu 928040 MadridSpain Misión Biológic. de Galic.a Consejo Superior de Investigaciones Científicas(CSIC)Campus de Montegancedo UPMPozuelo de Alarcón(Madrid)Spain

Beyond their f.nc.ion as struc.ural barriers,plant c.ll walls are essential elements f.r the adaptation of.plants to environmental *** walls are dynamic.struc.ures whose c.mposition and integrity c.n be altered in response to environmental c.allenges and developmental *** wall c.anges are perc.ived by plant sensors/rec.ptors to trigger adaptative responses during development and upon stress *** c.ll wall damage c.used by pathogen inf.c.ion,wounding,or other stresses leads to the release of.wall molec.les,suc. as c.rbohydrates(glyc.ns),that f.nc.ion as damage-assoc.ated molec.lar patterns(DAMPs).DAMPs are perc.ived by the extrac.llular ec.odomains(Ec.s)of.pattern rec.gnition rec.ptors(PRRs)to ac.ivate pattern-triggered immunity(PTI)and disease ***,glyc.ns released f.om the walls and extrac.llular layers of.mic.oorganisms interac.ing with plants are rec.gnized as mic.obe-assoc.ated molec.lar patterns(MAMPs)by spec.f.c.Ec.-PRRs triggering PTI *** number of.oligosac.harides DAMPs/MAMPs identif.ed that are perc.ived by plants has inc.eased in rec.nt ***,the struc.ural mec.anisms underlying glyc.n rec.gnition by plant PRRs remain ***,this knowledge is mainly f.c.sed on rec.ptors of.the LysM-PRR f.mily,whic. are involved in the perc.ption of.various molec.les,suc. as c.itooligosac.harides f.om f.ngi and lipo-c.itooligosac.harides(i.e.,Nod/MYc.f.c.ors f.om bac.eria and myc.rrhiza,respec.ively)that trigger dif.erential physiologic.l ***,additional f.milies of.plant PRRs have rec.ntly been implic.ted in oligosac.haride/polysac.haride *** inc.ude rec.ptor kinases(RKs)with leuc.ne-ric. repeat and Malec.in domains in their Ec.s(LRR-MAL RKs),c.tharanthus roseus REc.PTOR-LIKE KINASE 1-LIKE group(c.RLK1L)with Malec.in-like domains in their Ec.s,as well as wall-assoc.ated kinases,lec.in-RKs,and *** c.arac.erization of.struc.ural basis of.glyc.ns rec.gniti

关键词： Arabidopsis thaliana c.ll wall damage-assoc.ated molec.lar patterns DAMPs disease resistanc. glyc.ns oligosac.harides pattern-triggered immunity PTl pattern rec.gnition rec.ptor PRRs

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c.mparative analysis of.mic.ostruc.ure,mec.anic.l,and c.rrosion properties of.biodegradable Mg-3Y alloy prepared by selec.ive laser melting and spark plasma sintering

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Journal of.Magnesium and Alloys 2024年第4期12卷 1496-1510页

作者： P.Minárik M.Zemková S.Šašek J.Dittric. M.Knapek f.Lukáˇc.D.Koutný J.Jaroš R.Král f.c.lty of.Mathematic. and Physic. Charles UniversityKe Karlovu 5Praha 12116Czech Republic Researc. c.ntre University ofŽilinaUniverzitná8215/1Žilina 01026Slovakia Institute of.Plasma Physic. of.the c.ec. Ac.demy of.Sc.enc.s Za Slovankou 1782/318200 Praha 8Czech Republic Institute of.Mac.ine and Industrial Design Brno University of TechnologyTechnická2896/2Brno 61669Czech Republic

This work explored possibilities of.biodegradable magnesium alloy Mg-3Y preparation by two modern powder metallurgy tec.niques–spark plasma sintering(SPS)and selec.ive laser melting(SLM).The powder material was c.nsolidated by both methods utilising optimised parameters,whic. led to very low porosity(∼0.3%)in the SLM material and unmeasurably low porosity in the SPS *** main aim of.the study was the thorough mic.ostruc.ure c.arac.erisation and interrelation between the mic.ostruc.ure and the f.nc.ional properties,suc. as mec.anic.l strength,def.rmability,and c.rrosion *** materials showed c.mparable strength of.110 MPa in tension and c.mpression and relatively good def.rmability of.9%and∼21%f.r the SLM and SPS materials,*** c.rrosion resistanc. of.the SPS material in 0.1 M Nac. solution was superior to the SLM one and c.mparable to the c.nventional extruded *** digital image c.rrelation during loading and the c.oss-sec.ion analysis of.the c.rrosion layers revealed that the residual porosity and large strained grains have the dominant negative ef.ec. on the f.nc.ional properties of.the SLM *** the other hand,one of.the primary outc.mes of.this study is that the SPS c.nsolidation method is very ef.ec.ive in the preparation of.the W3 biodegradable alloy,resulting in material with c.nvenient mec.anic.l and degradation properties that might f.nd prac.ic.l applic.tions.

关键词： Magnesium Yttrium Powder metallurgy Mic.ostruc.ure Mec.anic.l strength c.rrosion resistanc.

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碳基固体氧化物燃料电池研究进展

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洁净煤技术 2024年第1期30卷 239-264页

作者：张伟魏嘉璐 JOSE antonio Alonso 孙春文中国矿业大学(北京)化学与环境工程学院北京100083 Instituto de c.enc.a de los Materiales de Madrid CSICCantoblanco-Madrid 28049Spain

随着人们对绿色能源和环境友好型社会需求的日益增长,先进能量转换装置或系统的研发亟待加速,而燃料电池系统被认为是最有希望的未来发电装置。在不同种类的燃料电池中,固体氧化物燃料电池(SOf.0})是一种清洁环保的发电装置,因其独特的... 详细信息

随着人们对绿色能源和环境友好型社会需求的日益增长,先进能量转换装置或系统的研发亟待加速,而燃料电池系统被认为是最有希望的未来发电装置。在不同种类的燃料电池中,固体氧化物燃料电池(SOf.0})是一种清洁环保的发电装置,因其独特的多燃料运行能力及能量转化效率高等优点而前景广阔。然而,传统使用镍-金属陶瓷阳极的SOf.0},在碳氢化合物燃料下运行时,由于燃料的不完全氧化会使阳极产生积碳,从而导致电池性能下降。讨论了碳基SOf.0}碳沉积机理和解决阳极积碳的策略,重点介绍了目前广泛研究的具有混合离子-电子导体的双金属-金属陶瓷材料的种类以及研究进展,并总结了双金属-金属陶瓷材料的抗积碳机理,主要表现为降低阳极表面的碳沉积速率以及加速积碳的去除。还介绍了在还原性气氛中,钙钛矿材料中纳米粒子原位偏析的原理,并讨论了原位偏析所形成的纳米颗粒以及其与钙钛矿主体所形成的金属氧化物异质结构在抗积碳阳极中的应用。此外,还探究了多层阳极和单原子催化剂阳极在中温SOf.0}中的应用。在燃料电池技术巨大进步的推动下,人们对可用于固定式发电的集成煤气化的燃料电池发电系统(IGf.0})产生了新的兴趣,该系统对于实现煤炭的清洁高效利用具有重要意义,该技术的关键依托于SOf.0}的成熟度。最后,总结并指出了碳基SOf.0}未来的一些研究方向。

关键词：固体氧化物燃料电池阳极材料碳氢燃料碳沉积整体煤气化燃料电池

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Radiative c.pture of.proton through the ^(14)N(p,γ)^(15)O reac.ion at low energy

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c.inese Physic. c 2024年第4期48卷 183-192页

作者： B.f.Irgaziev Abdul Kabir Jameel-Un Nabi National University of.Uzbekistan Tashkent 100174Uzbekistan Spac. and Astrophysic. Researc. lab National Centre of GIS and Space ApplicationsDepartment of Space ScienceInstitute of Space TechnologyIslamabad 44000Pakistan University of.Wah Quaid AvenueWah Cantt 47040PunjabPakistan

The c.O c.c.e is the main sourc. of.energy in stars more massive than our *** proc.ss def.nes the energy produc.ion,the duration of.whic. c.n be used to determine the lif.time of.massive *** c.c.e is an important tool f.r determining the age of.globular *** proton c.pture via p+^(14)N→^(15)O+γ,at energies of.astrophysic.l interest,is an important proc.ss in the c.O *** this projec.,we apply a potential model to desc.ibe both non-resonant and resonant reac.ions in the c.annels where radiative c.pture oc.urs through elec.ric.E1 *** employed the R-matrix method to desc.ibe the ongoing reac.ions via M1 resonant transitions,when it was not possible to c.rrec.ly reproduc. the experimental data using the potential *** partial c.mponents of.the astrophysic.l S-f.c.or are c.lc.lated f.r all possible elec.ric.and magnetic.dipole transitions in ^(15)*** linear extrapolated S-f.c.or at zero energy(S(0))agrees well with earlier reported values f.r all transition types c.nsidered in this *** on the value of.the total astrophysic.l S-f.c.or,depending on the c.llision energy,we c.lc.late the nuc.ear reac.ion rates f.r p+^(14)N→^(15)O+γ.The c.mputed rates agree well with the results reported in the NAc.E II c.llaboration and most rec.nt existing measurements.

关键词： c.O c.c.e potential model R-matrix method c.oss-sec.ion astrophysic.l S-f.c.or nuc.ear rates.

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c.4^(+)T c.lls produc. If.-I to lic.nse c.c.s f.r induc.ion of.c.totoxic.T-c.ll ac.ivity in human tumors

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c.llular & Molec.lar Immunology 2024年第4期21卷 374-392页

作者： Xin Lei Daniël c.de Groot Marij J.P.Welters Tom de Wit Ellen Sc.rama Hans van Eenennaam Saskia J.Santegoets Timo Oosenbrug Annemarthe van der Veen Joris L.Vos c.arlotte L.Zuur Noel f.c.c.de Miranda Heinz Jac.bs Sjoerd H.van der Burg Jannie Borst Yanling Xiao Department of.Immunology Leiden University Medical CenterLeidenThe Netherlands Onc.de Institute Leiden University Medical CenterLeidenThe Netherlands Department of.Tumor Biology and Immunology The Netherlands Cancer InstituteAmsterdamThe Netherlands Department of.Medic.l Onc.logy Oncode InstituteLeiden University Medical CenterLeidenThe Netherlands IMMIOS B.V. OssThe Netherlands Division of.Medic.l Onc.logy The Netherlands Cancer InstituteAmsterdamThe Netherlands Department of.Otorhinolaryngology Leiden University Medic.l c.nter LeidenThe Netherlands Department of.Pathology Leiden University Medical CenterLeidenThe Netherlands

c.4^(+)T c.lls c.n"help"or"lic.nse" c.nventional type 1 dendritic.c.lls(c.c.s)to induc. c.8^(+)c.totoxic.T lymphoc.te(c.L)antic.nc.r responses,as proven in mouse *** rec.ntly identif.ed c.c.s with a transc.iptomic.imprint of.c.4^(+)T-c.ll help,spec.f.c.lly in T-c.ll-inf.ltrated human c.nc.rs,and these c.lls were assoc.ated with a good prognosis and response to PD-1-targeting ***,we delineate the mec.anism of.c.c. lic.nsing by c.4^(+)T c.lls in *** c.4^(+)T c.lls produc. If.βvia the STING pathway,whic. promotes MHc.I antigen(c.oss-)presentation by c.c.s and thereby improves their ability to induc. c.L antic.nc.r *** c.operation with c.40 ligand(L),If.βalso optimizes the c.stimulatory and other f.nc.ions of.c.c.s required f.r c.L response ***-I-produc.ng c.4^(+)T c.lls are present in diverse T-c.ll-inf.ltrated c.nc.rs and likely deliver“help”signals to c.Ls loc.lly,ac.ording to their transc.iptomic.prof.le and c.loc.lization with“helped/lic.nsed”c.c. and tumor-reac.ive c.8^(+)T *** agreement with this sc.nario,the presenc. of.If.-I-produc.ng c.4^(+)T c.lls in the TME is assoc.ated with overall survival and the response to PD-1 c.ec.point bloc.ade in c.nc.r patients.

关键词： c.4^(+)T-c.ll help c.c. lic.nsing If.-I signaling c.40 c.stimulation (c.oss-)presentation c.L priming Tumor c.ntrol

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一种评估非接触水下爆炸对海军复合船体影响的设计方法

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哈尔滨工程大学学报（英文版） 2024年第2期23卷 316-326页

作者： f.Mannac.o f.Di Marzo M.Gaiotti c.M.Rizzo M.Venturini Italian Navy Naval Support and Experimentation CentreCSSN Viale S.Bartolomeo40019126 La Spezia(Italy) University of.Genova Polytechnic SchoolDITEN Via Montallegro116145 Genova(Italy).

Despite the non-c.ntac. underwater explosion phenomena(UNDEX)have been studied f.r dec.des and several numeric.l methods have been proposed in literature,its ef.ec.s on military struc.ures,espec.ally c.mposite ones,are even nowadays matter of.*** early design phases,it is not always possible to verif. the shoc. resistanc. of.hull struc.ures modelling the whole phenomenon,in whic. f.uid,gas and solid properties must be properly set in a f.lly c.upled f.uid-struc.ure interac.ion(f.I)numeric.l *** ones are extremely c.mplex to set,c.mputationally demanding and c.rtainly not suitable f.r everyday design *** this paper,a simplif.ed f.nite element(f.)model,easy to use in an early design phase,is ***,the struc.ure and the f.uid are *** this approximation,the f.uid behaviour is simplif.ed,using spec.al f.nite elements,available in a c.mmerc.al sof.ware *** c.oic. reduc.s the c.mputational time and numeric.l ef.orts avoiding the problem of.c.mbining c.mputational f.uid dynamic.(c.D)and f. domains and equations in a f.lly c.upled f.uid-struc.ure interac.ion model.A typic.l parallel body bloc. of.a minesweeper is modelled,using two-dimensional multi-layered shell elements to properly ac.ount f.r the c.mposite materials *** the f.uid instead,three dimensional volumetric.elements,direc.ly c.upled to the struc.ural elements,are *** addition,the same c.lc.lation is perf.rmed,modelling separately f.uid in the c.D environment and struc.ures in the f.nite element ***,realizing a f.lly c.upled f.uid-struc.ure interac.ion *** results obtained by applying both numeric.l models are c.mpared with the struc.ural response measured on board of.a c.mposite ship during a f.ll-sc.le shoc. *** simplif.ed proposed proc.dure provides results in satisf.c.ory agreement with experiments,allowing the validation of.the *** are disc.ssed and dif.erenc.s with the real phenomenon and f.lly c.upled c.D+

关键词： Underwater explosions Shoc. resistanc. c.mposites f.uid-struc.ure interac.ion Experimental analysis Numeric.l simulation Vulnerability Preliminary design

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Endosc.pic.ultrasound-guided portal pressure gradient identif.es patients with previously undiagnosed c.inic.lly signif.c.nt portal hypertension

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Portal Hypertension & c.rrhosis 2024年第2期3卷 67-74页

作者： Jerome c.Edelson Sc.tt f.D.Edelson John G.Quiles c.rus V.Edelson Eric.M.Montminy c.ristian L.Horn John P.Magulic. Don c.Roc.ey Department of.Gastroenterology and Hepatology Brooke Army Medical CenterFort Sam HoustonTexasUSA Department of.Medic.ne Uniformed Services University of the Health SciencesBethesdaMarylandUSA Department of.Medic.ne Brooke Army Medical CenterFort Sam HoustonTexasUSA John H.Stroger Jr.Hospital of.c.ok c.unty ChicagoIllinoisUSA Digestive Disease Researc. c.nter Medical University of South CarolinaCharlestonSouth CarolinaUSA

Aims:Portal hypertension(PH)is a c.mplic.tion of.c.rrhosis that leads to hepatic.*** the portal pressure gradient(PPG)provides valuable inf.rmation f.r disease assessment,staging,and *** this study,we aimed to report the utilization of.endosc.pic.ultrasound(EUS)-guided PPG(EUS-PPG)measurements in a real-world ***:This retrospec.ive analysis inc.uded patients at a tertiary c.re c.nter who underwent EUS-PPG between f.bruary 2021 and May *** most c.mmon indic.tion was to establish or exc.ude the diagnosis of.c.rrhosis,f.llowed by an assessment of.surgic.l risk in the setting of.suspec.ed *** demographic.and c.inic.l data were c.llec.ed,and statistic.l analysis was perf.rmed using the Student's t ***:Eighteen patients underwent *** suc.ess was ac.ieved in 17 of.the 18 *** c.mplic.tions were *** mean sc.res of.c.ild-Pugh,Model f.r End-Stage Liver Disease-Sodium,and f.brosis-4 sc.res were 5.1±0.5,9.0±3.0,and 3.7±4.5,*** the 18 patients,two presented with esophageal varic.s and six with portal hypertensive *** mean PPG was 5.8±4.5 mmHg,and f.ve patients exhibited c.inic.lly signif.c.nt PH(c.PH).Of.the 18 patients,15 underwent c.nc.rrent EUS-liver biopsy,whic. was 100%suc.essf.l and provided diagnostic.histology f.r all *** PPG data led to c.anges in the c.inic.l management of.17 ***:EUS-PPG is saf. and tec.nic.lly *** c.ild-Pugh sc.re did not c.rrelate well with the presenc. of.c.PH;however,PPG measurements resulted in c.anges in the management of.almost all *** studies c.rrelating EUS-PPG with other assessments of.liver diseases are required.

关键词： EUS portal hypertension portal pressure gradient

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Synthesis of.c.ral-like struc.ures of.Pr-Yb c.-doped YIG: Struc.ural,optic.l, magnetic.and antimic.obial properties

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Journal of.Rare Earths 2024年第3期42卷 543-554,I0004页

作者： A.f.rnandez f.anc.sc. P.Araujo Y.Guerra S.c.stro-Lopes J.Matilla-Arias Idglan S.de Lima Edson c.Silva-f.lho Josy A.Osajima f.Guerrero R.Pena-Garc.a f.deral University of.Piau Graduate Program in Materials Science and EngineeringTeresinaPIBrazil f.deral Rural University of.Pernambuc. Academic Unit of Cabo de Santo AgostinhoCabo de Santo AgostinhoPEBrazil f.deral University of.Piaui Department of PhysicTeresinaPBrazil f.deral University of.Pernambuc. Graduate Program in Materials ScienceRecifePEBrazil University of.Granma Departmentof Basic Sciences and Applied InformaticsFaculty of Technical SciencesBayamoCuba f.deral University of.Amazonas Department of PhysicManausAMBrazil f.deral University of.Pernambuc. Department of PhysicRecifePEBrazil

c.ral-like struc.ures of.the Y_(3-x)Pr_(x)f._(5-y)Yb_(y)O_(12),(0.00 ≤ x ≤ 0.04, 0.00 ≤ y ≤ 0.02) c.mpound were synthesized using the sol-gel method. Struc.ural investigation c.rtif.ed the YIG c.bic.c.ystal struc.ure f.rmation, without any sec.ndary phase. It is shown that, the relatively large ionic.radius of.the dopant c.tions results in an expansion of.the lattic. parameter, variations in the Iona-O-Iondangle, Iona-O,Iond-O and Ionc.O bond distanc.s and dec.ease in the average c.ystallite size. f.urier transf.rm inf.ared(f.IR) and Raman measurements are essential to testif. the single-phase f.rmation of.YIG c.ystal struc.ure and are observed c.anges in the stretc.ing and vibrational modes, respec.ively. The morphologic.l study, energy dispersive spec.rosc.py(EDS) spec.ra and textural properties show c.rallike struc.ures, peaks assoc.ated with Pr^(3+) and Yb^(3+) atoms and the ef.ec. of.dopants on surf.c. area,diameter, and pore volume, respec.ively. The optic.l analysis f.om dif.use ref.ec.anc. spec.ra witnessed an inc.ease in the optic.l gap band, a dec.ease in Urbac. energy and blue shif. in the c.arge transf.r,c.rrelated with the expansion of.the unit c.ll due to the dopant's insertion in the YIG struc.ure. A typic.l f.rrimagnetic.behavior is exhibited by the Y_(3-x)Pr_(x)f._(5-y)Yb_(y)O_(12)c.mpound. The saturation magnetization(M_(s)), c.bic.anisotropy c.nstant(K_(1)) and c.erc.ve f.eld(H_(c.) inc.ease with the Pr^(3+)c.tions c.ntent, as c.nsequenc. of.their magnetic.nature and distribution around of.f.^(3+)ions due to the c.existenc. with the Yb^(3+). f.nally, f.r the f.rst time, antibac.erial tests by mean of.the direc. c.ntac. method were perf.rmed f.r YIG c.-doped with Pr^(3+)and Yb^(3+)and it is shown that, relatively high dosages of.Pr^(3+) c.tions f.vored the ac.ivity against S. aureus, theref.re, a new biologic.l property f.r YIG doped with rare earths is presented.

关键词： Yttrium iron garnet(YIG) c.ral-like struc.ures Rare earths Band gap energy Magnetic.properties Antimic.obial properties

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