检索结果-南通市图书馆

Sexual Reproduction.On. Billion.Years Ago

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

n.tural Resources 2013年第5期4卷 383-386页

作者： petr n. kolosov Diamon. an. Precious Metal Geology In.titute Siberian.Bran.h Russian Academy of Sciences Yakutsk Russia

The facts regardin. to the early stages of algae evolution.in.the Precambrian.are very rare (more than.542 million.years ago). In.this paper, the author describes the first discovered eviden.e that the sexual reproduction.process took place on. billion.years ago. As it is kn.wn. sexual reproduction.led to the diversity of livin. organ.sms on.the Earth, an. in.gen.ral, accelerated the evolution.process.

关键词： Microorgan.sms Cyan.bacteria Algae Cells Sexual Reproduction Evolution n.oproterozoic Siberia

Microorgan.sms in.the Zon. of Submarin. Volcan.c Eruption. at 535-513 Ma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American.Journ.l of Plan. Scien.es 2014年第15期5卷 2464-2471页

作者： petr n. kolosov Len. S. Sofron.eva Diamon. an. Precious Metals Geology In.titute SB RAS Yakutsk Russia

n.w an.tomical features revealed in.some Early Cambrian.calcareous microfossils suggest comparison.with Rhodophyta (red algae), which makes it possible to defin. their taxon.mic position. A taxon.mically rich Early Cambrian.paleobiocoen.sis has been.discovered in.n.rthern.Tien.Shan. which exemplifies the existen.e on.earth at 535-513 Ma (million.years) of morphologically complex fun.iform microorgan.sms an. red algae in.a shallow-water biotope where en.iron.en.al con.ition. favorable for life were created as a result of submarin. volcan.c eruption..

关键词： Calcareous Microfossil Tetraspore Tetrasporan.ium Rhodophyta Cambrian Volcan.city Paleobiocoen.sis Tien Shan

Chan.es in.the adult sex ratio of six duck species breedin. population. over two decades

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian.Research 2024年第2期15卷 202-210页

作者： Mon.ka Homolkova petr Musil Diego Pavon.Jordan.Dorota Gajdosova Zuzan. Musilova Sarka n.uzilova Jan.Zouhar Departmen. of Ecology Faculty of Environmental SciencesCzech University of Life Sciences PragueKamýcka 129CZ-16521Prague–SuchdolCzech Republic Departmen. of Terrestrial Ecology Norwegian Institute for Nature Research(NINA)PO Box 5685 TorgardenTrondheimN-7485Norway Departmen. of Econ.metrics Faculty of Informatics and StatisticsUniversity of Economicsnam.W.Churchilla 4CZ-13067Prague 3Czech Republic

Despite all efforts,lon.-term chan.es in.the adult sex ratios of breedin. duck population. are still un.lear;this un.ertain.y is especially true for male-bias population.,which are often.un.er the scrutin. of researchers lackin. con.en.en. results for the active protection.of en.an.ered *** with male-bias population. are usually stron.ly affected by a declin. in.population.size that leads to a higher extin.tion.*** this study,we examin.d our lon.-term data of the abun.an.e of breedin. population. in.six duck species(Mallard An.s platyrhyn.hos,Gadwall Mareca strepera,Red-crested Pochard n.tta rufin.,Common.Pochard Aythya ferin.,Tufted Duck Aythya fuligula,an. Common.Golden.ye Bucephala clan.ula)from fishpon.s in.South Bohemia,Czechia,between.2004 an. *** eviden.e was used to assess lon.-term chan.es in.the adult sex ratio in.these breedin. population. an. in.estigate the possible effects of the n.O in.ex(n.rth Atlan.ic Oscillation.in.ex)on.them,in.icatin. climate con.ition. in.*** determin.d a lon.-term decrease of the proportion.of females in.the breedin. season.in.two of the six examin.d species:Common.Pochard an. Red-crested Pochard,which is driven.by the lon.-term in.rease in.the n.mber of males in.con.rast to the decreasin. or stable n.mber of females likely caused by differen. migration.behaviours between.females an. *** the case of Common.Pochard,in.breedin. population.,we estimated 60-65%of males in.the early 2000s risin. to 75-80%in.the early ***,we establish n. sign.fican. effects lin.ed to climate con.ition. of the previous win.er in.these species as a crucial cause of the chan.es of the proportion.of females in.the breedin. population.

关键词： Adult sex ratio Breedin. population Population.dyn.mics Red-listed species Waterfowl Win.er weather con.ition.

Cadaverin. an. putrescin. exposure in.luen.e carbon.an. n.trogen.cyclin. gen.s in.water an. sedimen. of the Yellow River

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

Journ.l of En.iron.en.al Scien.es 2024年第8期142卷 236-247页

作者： Wan.hon. Su Qiaolin. Yu Jiawei Yan. Qian.Han.Sijie Wan. petr Heden.c Xiaochen.Wan. Ruijun.Wan.Yan.Huan.Li School of Public Health Lanzhou UniversityLanzhou 730000China 2 Institute for Tropical Biodiversity and Sustainable DevelopmentUniversity Malaysia Terengganu21030Kuala NerusTerengganuMalaysia State Key Laboratory of Grasslan. Agro-ecosystems Center for Grassland MicrobiomeCollege of pastoral agriculture scien.e an. techn.logy Lanzhou UniversityLanzhou 730000China

The respon.e pattern. of microbial fun.tion.l gen.s in.olved in.biogeochemical cycles to cadaver decay is a cen.ral topic of recen. en.iron.en.al ***,the respon.e mechan.sms an. pathways of the fun.tion.l gen.s associated with the carbon.C)an. n.trogen.n.cyclin. to cadaveric substan.es such as cadaverin. an. putrescin. remain.*** study explored the variation.of fun.tion.l gen.s associated with C fixation.C degradation.an. n.cyclin. an. their in.luen.in. factors un.er cadaverin.,putrescin. an. mixed *** results showed on.y putrescin. sign.fican.ly in.reased the alpha diversity of C fixation.gen.s,while reducin. the alpha diversity of n.cyclin. gen.s in.*** the C cyclin.,the mixed treatmen. sign.fican.ly decreased the total abun.an.e of reductive acetyl-CoA pathway gen.s(i.e.,acsB an. acsE)an. lig gen. lin.ed to lign.n.degradation.in.water,while on.y sign.fican.ly in.reasin. the hydroxypropion.te-hydroxybutylate cycle(i.e.,accA)gen. abun.an.e in.*** the n.cyclin.,mixed treatmen. sign.fican.ly decreased the abun.an.e of the n.trification.i.e.,amoB),den.trification.i.e.,n.rS3)gen.s in.water an. the assimilation.pathway gen.(i.e.,gdhA)in.*** factors(i.e.,total carbon.an. total n.trogen.were all n.gatively associated with the gen.s of C an. n.***,cadaverin. an. putrescin. exposure may in.ibit the pathway in.C fixation.an. n.cyclin.,while promotin. C *** fin.in.s can.offer some n.w in.ight for the man.gemen. of amin. pollution.caused by an.mal cadavers.

关键词： Carbon.cyclin. n.trogen.cyclin. Cadaverin. Putrescin. Pollution.man.gemen.

An.in.egrated microfluidic platform for n.cleic acid testin.

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

Microsystems & n.n.en.in.erin. 2024年第3期10卷 181-194页

作者： An.ao Sun.petra Vopařilová Xiaochen. Liu Bin.qian.Kou TomášŘezn.ček TomášLedn.cký Shen. n. JiříKudr On.řej Zítka Zden.a Fohlerová petr Pajer Haoqin. Zhan. Pavel n.užil Min.stry of Education.Key Laboratory of Micro an. n.n. Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi’anShaanxi 710072P.R.China Departmen. of Chemistry an. Biochemistry Mendel University in BrnoZemědělská161300 BrnoCzech Republic ITD Tech s.r.o Osvoboditelů100573581 BohumínCzech Republic Cen.ral European.In.titute of Techn.logy Brno University of TechnologyPurkyňova 123Brno 61200Czech Republic Departmen. of Electron.c an. Computer En.in.erin. The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina Departmen. of Microelectron.cs Faculty of Electrical Engineering and CommunicationBrno University of TechnologyTechnická3058/10Brno 61600Czech Republic Military Health In.titute U Vojenskénemocnice 120016200 Praha 6Czech Republic The Key Laboratory of Biomedical In.ormation.En.in.erin. of Min.stry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’anShaanxi 710049P.R.China Bioin.pired En.in.erin. an. Biomechan.cs Cen.er(BEBC) Xi’an Jiaotong UniversityXi’an 710049P.R.China

This study presen.s a rapid an. versatile low-cost sample-to-an.wer system for SARS-CoV-2 *** system in.egrates the extraction.an. purification.of n.cleic acids,followed by amplification.via either reverse tran.cription.uan.itative polymerase chain.reaction.RT–qPCR)or reverse tran.cription.loop-mediated isothermal amplification.RT–LAMP).By meetin. diverse diagn.stic an. reagen. n.eds,the platform yields testin. results that closely align.with those of commercial RT-LAMP an. RT‒qPCR *** advan.ages of our system in.lude its speed an. *** assay is completed within.28 min.in.ludin. sample loadin.(5 min.,ribon.cleic acid(Rn.)extraction.3 min.,an. RT-LAMP(20 min..The cost of each assay is≈$9.5,an. this pricin. is competitive again.t that of Food an. Drug Admin.stration.FDA)-approved commercial *** some Rn. loss durin. on.chip extraction.is observed,the platform main.ain. a poten.ial limit of detection.lower than.297 *** makes the system particularly useful in.en.iron.en.s where cen.ralized laboratories are either un.vailable or in.on.en.en.ly *** key feature is the platform’s versatility,allowin. users to choose between.RT‒qPCR or RT‒LAMP tests based on.specific requiremen.s.

关键词： testin. main.ain versatile

The Role of Red Algae in.Abrupt Appearan.e of An.mals in.the Early Cambrian.on.Siberian.Platform

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American.Journ.l of Plan. Scien.es 2013年第12期4卷 60-64页

作者： P. n. kolosov Diamon. an. Recious Metal Geology In.titute SB RAS Yakutsk Russia

Calcified rock-formin. marin. filamen.ed ben.hic micro- an. macrophytes of Dzhelin.ia kolosov, 1970 (Figure 1(а)) an. Chaptchaica kolosov, 1975 (Figure 1(b)) gen.ra, thrived in.n.oproterozoic (1000-541 million.years ago) Siberia together with cyan.bacteria. Their belon.in. to Rhodophyta is well-groun.ed. These an. other n.oproterozoic rodofits, as well as Epiphyton.Born.man. 1886 (Figure 1(c)) an. other Early Cambrian.(541-513 million.years ago) ben.hic algae, oxygen.tin. floor of epicon.in.n.al sea basin. formed con.ition., favorable for the an.mals. In.combin.tion.with other biotic, an. such abiotic factors as: equatorial position.an. tecton.c feature of Siberian.platform;volcan.sm;tran.gression.of the sea;diversity of ecologic n.ches, these con.ition. were prerequisites of skeleton.an. shell acquisition.by Early Cambrian.an.mals, an. as a con.equen.e, accelerated morphologic evolution. in.reased diversity of taxon. of differen. groups of an.mals.

关键词： Cyan.bacteria Rhodophyta Symbios Skeleton Biodiversity n.oproterozoic Cambrian Siberian

Experimen.al an. n.merical in.estigation.of con.rolled disturban.es developmen. from two sources in.superson.c boun.ary layer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advan.es in.Aerodyn.mics 2019年第1期1卷 288-300页

作者： G.L.kolosov A.D.Kosin.v A.n.Semen.v A.A.Yatskikh Khristian.vich In.titute of Theoretical an. Applied Mechan.cs SB RAS Novosibirsk 630090Russia

The paper presen.s the experimen.al results an. the results of direct n.merical simulation.of the developmen. an. in.eraction.of two wave train. from two poin. sources of con.rolled disturban.es in.a superson.c boun.ary layer on.a flat plate with an.in.iden. flow Mach n.mber of *** were located parallel to the leadin. edge of the *** the in.roduction.of con.rolled disturban.es in.o the boun.ary layer,the n.rmal compon.n. of the mass flow rate was varied in.the *** the experimen.,periodic glow discharges at a frequen.y of 20 kHz were *** both cases,the disturban.es sources worked *** flow rate pulsation. were measured an. recorded in.section.,parallel to the leadin. edge of the model,n.ar the maximum of disturban.es alon. the boun.ary *** the experimen.,a con.tan.temperature hot-wire an.mometer was *** performin. a discrete Fourier tran.form,the spatial distribution. of disturban.es,the beta-spectra were determin.d,an. the wave characteristics of the developmen. of disturban.es down.tream were *** addition.direct n.merical simulation.of the down.tream developmen. of disturban.es from a sin.le source was *** work presen.s a comparison.of experimen.al an. theoretical calculated *** paper discusses the effects in.eren. in.the in.eraction.of un.table travelin. con.rolled disturban.es from two sources operatin. syn.hron.usly.

关键词： :Dn. Computation.l modelin. Superson.c boun.ary layer Compressibility Discharge Flat plate Hot-wire an.mometer In.tability Turbulen.e

n.merical Simulation.of Separated Flows in.Chan.els

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journ.l of Thermal Scien.e 2012年第2期21卷 145-153页

作者： petr Louda Jaromír Príhoda petr Sváek Karel Kozel Czech Techn.cal Un.versity in.Prague Fac. of Mechanical Engineering Karlovo nám. 13 CZ-121 35 Praha 2 In.titute of Thermomechan.cs AS CR v.v.i. Dolejkova 5 CZ-182 00 Praha 8

The work deals with n.merical modellin. of turbulen. flows in.chan.els with an.expan.ion.of the cross-section.where flow separation.an. reattachmen. occur. The performan.e of several eddy viscosity models an. an.explicit algebraic Reyn.lds stress model (EARSM) is studied. The used test cases are flows in.chan.els with various backward facin. steps where the step is perpen.icular or in.lin.d an. the top wall is parallel or deflected. Furthermore, a chan.el with the circular ramp is con.idered. The n.merical solution.is achieved by the fin.te volume method or by the fin.te elemen. method. The results of both n.merical approaches are compared.

关键词： backward facin. step flow EARSM model SST model

Accurate large-scale simulation. of siliceous zeolites by n.ural n.twork poten.ials

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

n.j Computation.l Materials 2022年第1期8卷 1662-1673页

作者： An.reas Erlebach petr n.chtigall LukášGrajciar Departmen. of Physical an. Macromolecular Chemistry Charles UniversityHlavova 812800Prague 2Czech Republic

The computation.l discovery an. design.of zeolites is a crucial part of the chemical *** highly accurate while computation.l feasible protocol for iden.ification.of hypothetical siliceous frameworks that could be targeted experimen.ally is a great *** tackle this challen.e,we train.d n.ural n.twork poten.ials(n.P)with the Schn.t architecture on.a structurally diverse database of den.ity fun.tion.l theory(DFT)*** database was iteratively exten.ed by active learn.n. to cover n.t on.y low-en.rgy equilibrium con.iguration. but also high-en.rgy tran.ition.*** demon.trate that the resultin. reactive n.Ps retain.DFT accuracy for thermodyn.mic stabilities,vibration.l properties,as well as reactive an. n.n.reactive phase *** a showcase,we screen.d an.existin. zeolite database an. revealed>20k addition.l hypothetical frameworks in.the thermodyn.mically accessible ran.e of zeolite ***,our n.Ps are expected to be essen.ial for future high-throughput studies on.the structure an. reactivity of siliceous zeolites.

关键词： syn.hesis zeolite zeolites