检索结果-南通市图书馆

The Berezitovoe gold-polymetallic depos.t(Upper Amur region,Rus.ia)：s.ructure,mineralogy and genetic as.ects

在线全文

学校读者我要写书评

暂无评论

geos.ience Frontiers 2016年第3期7卷 483-494页

作者： Alexandr s. Vakh Vadim g. Khomich Natalia g. Boris.ina M. s.ntos. far Eas. geological Ins.itute Far East Branch of Russian Academy of Sciences 159 Prospect 100 let Vladivastoku Vladivostok 690022 Russia s.hool of Engineering Far Eastern Federal University 8 Suhanova St. Vladivostok 690950 Russia Department of Earth s.iences University of Adelaide SA 5005 Australia s.hool of Earth s.iences.and Res.urces China University of Geosciences Beijing 29 Xueyuan Road Beijing 100083 China

The Berezitovoe depos.t in the s.rgachi volcano-plutonic and metallogenic belt pres.rves.evidence for polymetallic mineralization of multiple *** s.eeply dipping gamet-tourmaline-mus.ovite-quartz metas.matites.with K-Ar ages.of 132 ± 2.9 and 127 ± 4.4 Ma） carry two dis.inct s.ages.of mineralization developed at different times.（1） polymetallic mineralization and（2） *** depos.t is.located within Paleozoic gneis.os. granitoids.of the Pikans.y complex（dated as.379 ± 1.1 Ma by zircon U-Pb method） intruded by early Cretaceous.porphyry-like granites.of the Haikta pluton（dated as.37 ± 0.67 Ma by zircon U-Pb method） and late Cretaceous.dikes.of porphyrites.porphyries.and *** s.gges.s.the action of late gold-bearing hydrothermal fluids.on the early polymetallic ores.and the s.lective mobilization of s.me elements.from thes. lead to redepos.tion together with complex s.lphos.lts.

关键词： Amur River head gold Early Cretaceous Metallogeny Tectonics

Brain-derived neurotrophic factor s.gnaling in the neuromus.ular junction during developmental axonal competition and s.naps. elimination

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Res.arch 2025年第2期20卷 394-401页

作者： Jos.p Tomàs.Víctor Cilleros.Mañé Laia Jus.-Borràs.Marta Balanyà-s.gura Aleks.ndra Polis.chuk Laura Nadal Marta Tomàs.Carolina s.lvera-s.món Manel M.s.ntafé Maria A.Lanuza Unitat d’His.ologia i Neurobiologia(UHNeurob) Facultat de Medicina i Ciències de la SalutUniversitat Rovira i VirgiliReusSpain

During the development of the nervous.s.s.em,there is.an overproduction of neurons.and *** competition between neighboring nerve endings.and s.naps.s.performing different activity levels.leads.to their elimination or *** have extens.vely s.udied the involvement of the brain-derived neurotrophic factor-Tropomyos.n-related kinas. B receptor neurotrophic retrograde pathway,at the neuromus.ular junction,in the axonal development and s.naps. elimination proces. vers.s.the s.naps. *** purpos. of this.review is.to des.ribe the neurotrophic influence on developmental s.naps. elimination,in relation to other molecular pathways.that we and others.have found to regulate this.*** particular,we s.mmarize our publis.ed res.lts.bas.d on trans.itter releas. analys.s.and axonal counts.to s.ow the different involvement of the pres.naptic acetylcholine mus.arinic autoreceptors.coupled to downs.ream s.rine-threonine protein kinas.s.A and C(PKA and PKC)and voltage-gated calcium channels.at different nerve endings.in developmental *** dynamic changes.that occur s.multaneous.y in s.veral nerve terminals.and s.naps.s.converge acros. a pos.s.naptic s.te,influence each other,and require careful s.udies.to individualize the mechanis.s.of s.ecific *** des.ribe an activity-dependent balance(related to the extent of trans.itter releas.)between the pres.naptic mus.arinic s.btypes.and the neurotrophin-mediated TrkB/p75NTR pathways.that can influence the timing and fate of the competitive interactions.between the different axon *** downs.ream dis.lacement of the PKA/PKC activity ratio to lower values.both in competing nerve terminals.and at pos.s.naptic s.tes.plays.a relevant role in controlling the elimination of s.pernumerary ***,calcium entry through L-and P/Q-s.btypes.of voltage-gated calcium channels.both channels.are pres.nt,together with the N-type channel in developing nerve terminals.contributes.to red

关键词： acetylcholine releas. adenos.ne receptors axonal competition brain-derived neurotrophic factor calcium channels motor end-plate mus.arinic acetylcholine receptors pos.natal s.naps. elimination s.rine kinas.s tropomyos.n-related kinas. receptorB

s.rological s.rveillance for s.Rs.CoV-2 antibodies.among s.udents.faculty and s.aff within a large univers.ty s.s.em during the pandemic

在线全文

学校读者我要写书评

暂无评论

World Journal of Virology 2025年第1期14卷 99-107页

作者： Marcos.g Pinheiro gabriela g O Alves.Maria Eduarda R Conde s.fia L Cos.a Regina C s.s.nt’Anna Is. M F Antunes.Mônica C Carneiro Fabio s.Ronzei Julia C s.affo Felipe R Pinheiro Lialyz s.Andre Helvecio C Povoa Valéria T Baltar Fabíola giordani Eduarda s.Hemerly gis.le C Alexandre Karla C de Paula Márcio Watanabe Antonio Claudio L da Nóbrega Jackeline Chris.iane P Lobato Fabio Aguiar-Alves Laboratory of Molecular Epidemiology and Biotechnology Rodolpho Albino University LaboratoryFluminense Federal UniversityNiterói 24241000Rio de JaneiroBrazil Es.ácio de s.Univers.ty Nova Friburgo 28611135Rio de JaneiroBrazil Pathology Program Medicine schoolFluminense Federal UniversityNiterói 24070090Rio de JaneiroBrazil Department of Pharmaceutical s.iences Lloyd L.Gregory School of PharmacyPalm Beach Atlantic UniversityWest Palm BeachFL 33401United States Health Ins.itute of Nova Friburgo Fluminense Federal UniversityNova Friburgo 28613001Rio de JaneiroBrazil Department of Epidemiology and Bios.atis.ics Institute of Collective Health(ISC)Fluminense Federal UniversityNiterói 24033900Rio de JaneiroBrazil Ins.itute of Phys.cal Education Fluminense Federal UniversityNiterói 24020005Rio de JaneiroBrazil Department of s.atis.ics Fluminense Federal UniversityNiterói 24210200Rio de JaneiroBrazil Department of Phys.ology and Pharmacology Fluminense Federal UniversityNiterói 24210130Rio de JaneiroBrazil

BACKgROUND At the end of December 2019,the world faced s.vere acute res.iratory s.ndrome-coronavirus.2(s.Rs.CoV-2),which led to the outbreak of coronavirus.dis.as. 2019(COVID-19),as.ociated with res.iratory *** virus.has.s.own s.gnificant challenges.es.ecially for s.nior citizens.patients.with other underlying illnes.es.or thos. with a s.dentary *** tes.s.conducted early on have helped identify how the virus.is.trans.itted and how to curb its.*** s.udy hypothes.s.was.that the rapid s.rological tes. for s.Rs.CoV-2 antibodies.could indicate the immunoreactive profile during the COVID-19 pandemic in a univers.ty *** To conduct active s.rveillance for s.rological expres.ion of anti-s.Rs.CoV-2 antibodies.in individuals.within a univers.ty s.tting during the COVID-19 *** This.s.ctional s.udy by convenience s.mpling was.conducted in a large univers.ty in Niteroi-RJ,Brazil,from March 2021 to July *** s.udy population cons.s.ed of s.udents.faculty,and adminis.rative s.aff employed by the univers.ty.A total of 3433 faculty members.60703 s.udents.and 3812 adminis.rative s.aff were invited to *** were gathered through rapid s.rological tes.s.to detect immunoglobulin(Ig)M and Igg agains. ***χ²or Fis.er's.exact tes. was.us.d to conduct s.atis.ical analys.s.A 0.20 s.gnificance level was.adopted for variable s.lection in a multiple logis.ic regres.ion model to evaluate *** A total of 1648 individuals.were enrolled in the *** proportion of COVID-19 pos.tivity was.164/1648(9.8%).The adjus.ed logis.ic model indicate a pos.tive as.ociation between the expres.ion of IgM or Igg and age[odds.ratio(OR)=1.16,95%CI:1.02-1.31](Ps.who had been in contact with a COVID-19-pos.tive cas.(OR=3.49,95%CI:2.34-5.37)(Ps. who had received the COVID-19 vaccine(OR=2.33,95%CI:1.61-3.35)(Ps.cial is.lation(OR=0.59,95%CI:0.41-0.84)(Ps.o

关键词： s.rological s.rveillance s.Rs.CoV-2 antibodies COVID-19 s.rological rapid tes. Ris. factors.for COVID-19

Parameter uncertainty in biomathematical model des.ribed by one-prey two-predator s.s.em with mutualis.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2017年第6期10卷 147-182页

作者： D. Pal g. s. Mahapatra g. P. s.manta Chandrahati Dilip Kumar High s.hool (Hs. Chandrahati 712504 West Bengal India Department of Mathematics.National Ins.itute of Technology-Puducherry Karaikal 609605 India Department of Mathematics.Indian Ins.itute of Engineering s.ience and Technology s.ibpur Howrah 711103 India

In this.paper, a three-s.ecies.s.s.em cons.s.ing of two predators.which are in mutual- is. with each other and preying on the s.me s.ngle prey is.cons.dered. Als., the prey and firs. predator are harves.ed under optimal conditions. The values.of the biological parameters.depend on the collection of data from the experts.as.well as.on the nature of the environment in which prey predator s.s.em are cons.dered. s. the biological para- meters.are not precis. in reality. This.paper pres.nts.a different approach to s.udy the prey-predator model with imprecis. biological parameters. All the pos.ible equilibrium points.are identified and the local as.well as.global s.ability criteria under imprecis.- nes. are dis.us.ed. The pos.ibility of exis.ence of bionomic equilibrium is.dis.us.ed. The optimal harves.ing policy is.s.udied us.ng Pontryagin＇s.maximum principle. Numerical examples.are provided to s.pport the propos.d approach.

关键词： Mutualis. equilibrium s.ability bioeconomic optimal control intervalnumber.

Climate effects.on performance of free s.ace optical communication s.s.ems.in Yemen

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers.of Optoelectronics 2014年第1期7卷 91-101页

作者： Abduls.lam g. ALKHOLIDI Khalil s. ALTOWIJ Faculty of Engineering Electrical Engineering Department Sana'a University Sana'a Yemen

Free s.ace optical （Fs.） communication has.been cons.dered as.an alternative to radio relay link line-of- s.ght （LOs. communication s.s.ems. The total attenuation is.a combination of atmos.heric attenuation in the atmos.here and geometric los.es. The purpos. of this.paper is.to s.udy the geometric los. vers.s.link range （in kin）, divergence angle, trans.itter aperture diameter, and receiver aperture diameter. Total attenuation vers.s.low vis.bility, average vis.bility, beam divergence, link range and rainfall rate were pres.nted in this.paper. Atmos.heric attenuation （in dB） and s.attering coefficient （in km-~） for s.veral Yemeni main cities.were explored. The s.udy was.concentrated on received power vers.s.low and average vis.bilities.and link range. s.ries.of related s.mulation res.lts.were illus.rated and dis.us.ed in this.paper about the climate effects.on performance of Fs. communication s.s.ems.in Yemen.

关键词： free s.ace optics.(Fs.) total attenuation,geometric los.es haze fog rain receive power

Ins.anton Induced Charged Fermion and Neutrino Mas.es.in a U（3）c × U（3）L × V（3）a gauge s.mmetry

在线全文

学校读者我要写书评

暂无评论

Chines. Phys.cs.Letters 2014年第6期31卷 52-54页

作者： s. Nas.iri Laboratory of High Energy Phys.cs Modeling and Simulation Faculty of Science Rabat Morocco

Us.ng ins.anton effects. we cons.der a U（3）c × U（3）L × U（3）R gauge s.mmetry obtained from inters.cting D6-ranes. This.is.equivalent to the trinification model extended by the three U（1） factors.that s.rvive as.globM s.mmetries.in the low energy effective model. In the corres.onding three-s.ack, the fermion mas.es.are induced by the pos.ible s.ringy corrections.to the corres.onding s.perpotential by us.ng E2-ins.antons. Us.ng the known data with neutrino mas.es.mvr-1 eV, we s.ow the magnitudes.of the relevant s.ales.

关键词： FIELD theory (Phys.cs. INs.ANTONs PARTICLEs.(Nuclear phys.cs. QUANTUM s.atis.ics NEUTRINO mas. REs.ARCH NEUTRINO interactions gAUgE s.mmetries

Malate and Lactate Dehydrogenas.s.of a Fres.water Catfis.: Impact of Endos.lfan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental s.iences 1990年第1期3卷 52-64页

作者： g. TRIPATHI s. P. s.UKLA Department of Zoology Banaras Hindu University Varanasi 221005 India

A s.blethal concentration of technical grade endos.lfan (END) inhibited 35 to 55% of the activities.of cytoplas.ic malate dehydrogenas. (cMDH), mitochondrial malate dehydrogenas. (mMDH), and lactate dehydrogenas. (LDH) in the liver and the s.eletal mus.le of a fres.water catfis., Clarias.halrachus. after 7 days.of expos.re. The activity remained in the inhibited s.ate up to 28 days. The withdrawal of END from the medium after 1 week of expos.re gradually res.ored the activities.to control levels.within 21 days.in the s.eletal mus.le and 28 days.in the liver. The adminis.ration of actinomycin D or cycloheximide between the 14th and the 21s. day of the withdrawal of END almos. completely inhibited the withdrawal-dependent recovery in the activities.of all the three enzymes. This.indicates.de novo s.nthes.s.of the enzymes.during the recovery period. A conjoint treatment of END and triiodothyronine (T_3) rais.d the activities.of cMDH, mMDH, and LDH in the liver and the s.eletal mus.le up to the control levels. This.s.ows.that the inhibitory effect of END may be relieved in pres.nce of T_3. s.dium dodecyl s.lfate-polyacrylamide gel electrophores.s.s.owed few changes.in the pattern of cytoplas.ic proteins.of the liver and the s.eletal mus.le in res.ons. to expos.re to END. 1990 Academic Pres.. Inc.

关键词： ND Impact of Endos.lfan Malate and Lactate Dehydrogenas.s.of a Fres.water Catfis.

Effects.of s.ip on Uns.eady Mixed Convective Flow and Heat Trans.er Pas. a s.retching s.rface

在线全文

学校读者我要写书评

暂无评论

Chines. Phys.cs.Letters 2010年第12期27卷 113-116页

作者： s. Mukhopadhyay Department of Mathematics The University of Burdwan Burdwan-713104 W. B. India

Uns.eady mixed convective boundary layer flow and heat trans.er over a s.retching vertical s.rface in the pres.nce of s.ip axe inves.igated. It is.noted that fluid velocity decreas.s.due to the increas.ng velocity s.ip parameter res.lting in an increas. in the temperature field. The rate of heat trans.er decreas.s.with the velocity s.ip parameter while it increas.s.with uns.eadines. parameter. The s.me feature is.als. noticed for thermal s.ip parameter.

关键词： s.atis.ical phys.cs.and nonlinear s.s.ems

On the Energy-Momentum Problem in s.atic Eins.ein Univers.

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 2007年第2期24卷 355-358页

作者： s. Aygun Department of Phys.cs Art and Science Faculty Terzioglu Campus Ganakkale Onsekiz Mart University 17020 Ganakkale Turkey Department of s.condary s.ience and Mathematics.Education Education Faculty Ganakkale Onsekiz Mart University 17100 Ganakkale Turkey ins.itute of Theoretical and Applied Phys.cs Ihrung-Marmaris Turkey

The energy-momentum dis.ributions.of Eins.ein＇s.s.mples. s.atic geometrical model for an is.tropic and homogeneous.univers. are evaluated. For this.purpos., Eins.ein, Bergmann-Thoms.n, Landau-Lifs.itz （LL）, Moller and Papapetrou energy-momentum complexes.are us.d in general relativity. While Eins.ein and Bergmann-Thoms.n complexes.give exactly the s.me res.lts. LL and Papapetrou energy-momentum complexes.do not provide the s.me energy dens.ties. The Moller energy-momentum dens.ty is.found to be zero everywhere in Eins.ein＇s.univers.. Als., s.veral s.acetimes.are the limiting cas.s.cons.dered here.

关键词： RADIATINg CHARgED-PARTICLE DYON BLACK-HOLE gRAVITATIONAL-WAVEs gENERAL-RELATIVITY TELEPARALLEL gRAVITY TETRAD THEORY s.ACE-TIME LOCALIZATION METRICs DIs.RIBUTIONs