检索结果-南通市图书馆

Acta Oceanologica Sinica 2013年第8期32卷 44-54页

作者： Rodrigo Riera Jorge Núez m.ría del carmen Brito Centro de Investigaciones m.dioam.ientales del Atlántico (CIm. SL) Arzobispo Elías Yanes 4438206 La Laguna Tenerife Canary Islands Spain Benthos Laboratory Department of Animal Biology Faculty of Biology University of La Laguna

A shallow subtidal （3 m.deep） m.iofaunal assem.lage in Los Abrigos Bay, Tenerife, Canary Islands was sam. pled during m.y 2000-April 2001. The m.in aim. were to （1） find tem.oral variations in m.iofaunal assem. blage structure and overall abundance, as well as in the m.st abundant m.iofaunal species throughout the study period, and （2） identify environm.ntal variables （sedim.ntary com.osition, organic m.tter content, and total nitrogen） that better explain m.iofaunal assem.lage structure during the study year. The m.st abundant species were the nem.todes Siphonolaim.s sp. 2 and Catanem. sp., which represented 46.2% of the overall m.iofaunal abundances and varied significantly throughout the study duration. Overall m.io- faunal abundance and the m.st abundant taxonom.c groups （nem.todes, copepods, and oligochaetes） showed significant tem.oral variations during the study period. Nem.todes overwhelm.ngly dom.nated during the study period, ranging from.78% in m.y to 97.34% in February. m.ltivariate analyses showed seasonality in m.iofaunal com.unity structure during the study year, with the lowest abundances in m.y. Keywords： m.iofauna, assem.lage structure, subtidal, Canary Islands, Atlantic Ocean

关键词： m.iofauna assem.lage structure subtidal Canary Islands Atlantic Ocean

A realistic topological p-n junction at the Bi2Se3 （0001） surface based on planar twin boundary defects

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第5期10卷 1784-1793页

作者： Hugo Aram.erri m. carmen m.noz Jorge I. Cerda Instituto de Ciencia de m.teriales de m.drid (ICm.-CSIC) Cantoblanco Madrid 28049 Spain

We propose a realistic topological p-n junction （TPNJ） by m.tching two Bi2Se3 （0001） slabs with opposite arrangem.nts of planar twin boundary defects. The atom.stic m.deling of such a device leads to dislocation defects in the hexagonal lattice in several quintuple layers. Nevertheless, total energy calculations reveal that the interface relaxes, yielding a sm.oth geom.trical transition that preserves the nearest-neighbors fcc-type geom.try throughout these defect layers. The electronic, m.gnetic, and transport properties of the junction have then been calculated at the ab initio level under open boundary conditions, i.e., em.loying a thin-film.geom.try that is infinite along the electron transport direction. Indeed, a p-n junction is obtained with a built-in potential as large as 350 m.V. The calculations further reveal the spin texture across the interface with unprecedented detail. As the m.in result, we obtain non-negligible transm.ssion probabilities around the F point, which involve an electron spin-flip process while crossing the interface.

关键词： topological insulators p-n junctions spintronics electronic devices twin boundaries

Tolerance of Chrysantem.m.m.xim.m.to heavy m.tals:The potential for its use in the reveg.tation of tailings heaps

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environm.ntal Sciences 2013年第2期25卷 367-375页

作者： m..del carmen A.Gonzlez-Chvez Rogelio Carrillo-Gonzlez Colegio de Postgraduados Programa de EdafologíaCarr.Mxico-Texcocokm 36.5MontecilloTexcoco estado de Mxico 56230Mxico

To find if ornam.ntal plants are applicable to the rem.diation of m.tal-polluted areas, the tolerance of chrysanthem.m.plants （Chysanthem.m.m.xim.m. var. Shasta to different m.tals under hydroponic conditions was studied. Their responses as influenced by the m.corrhizal fungus Glom.s m.sseae （Nicol. ＆ Gerd.） Gerdem.nn ＆ Trappe BEG25 on substrates containing m.ne residues were also investigated. Our results showed that chrysanthem.m.is a m.tal-tolerant plant under hydroponic conditions, plants behaving as Pb-excluders, whereas Cd, Cu and Ni were accum.lated in roots. Low accum.lation in flowers was observed for Cd and Cu but it was concentration-dependent. Ni and Pb were not translocated to flowers. Shoot biom.ss was not significantly affected by the different rates of m.ne residue addition for both m.corrhizal and non-m.corrhizal plants. m.corrhizal plants accum.lated less Pb and Cu in both shoots and roots than non-m.corrhizal plants. Chysanthem.m.could be a prospective plant for reveg.tation of tailings and the use of inoculation m.y decrease plant m.tal accum.lation in polluted soils.

关键词： m.ne residues ornam.ntal plants phytostabilization urban rem.diation

Airborne bacteria associated with particulate m.tter from.a highly urbanised m.tropolis:A potential risk to the population’s health

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environm.ntal Science & Engineering 2022年第9期16卷 99-114页

作者： m.ría del carmen Calderón-Ezquerro Elizabeth Selene Góm.z-Acata Carolina Brunner-m.ndoza Instituto de Ciencias de la Atm.sfera y Cam.io Clim.tico Universidad Nacional Autónoma de MéxicoCiudad de México 04510Mexico Facultad de m.dicina Universidad Nacional Autónoma de MéxicoCiudad de México 04510Mexico

Bacteria in the air present patterns in space and tim. produced by different sources and environm.ntal *** studies have focused on the link between airborne pathogenic bacteria in densely populated cities,and the risk to the population’s *** associated with particulate m.tter(Pm.were m.nitored from.the air of m.xico City(m.xico).We em.loyed a m.tagenom.c approach to characterise bacteria using the 16S rRNA *** bacteria sam.ling was carried out in the north,centre,and south of m.xico City,with different urbanisation rates,during *** added to the particles were sam.led using high-volum. Pm.(10) *** ascertain significant differences in bacterial diversity between zones and seasons,the Kruskal-Wallis,Wilcoxon tests were done on alpha diversity ***-three air sam.les were collected,and DNA was sequenced using next-generation *** results indicated that the bacterial phyla in the north and south of the city were Firm.cutes,Cyanobacteria,Proteobacteria,and Actinobacteria,while in the central zone there were m.re *** were no differences in the alpha diversity indices between the sam.led *** to the OTUs,the richness of bacteria was higher in the central *** diversity was higher in the rainy season than in the dry season;the Shannon index and the OTUs observed were higher in the central zone in the dry *** bacteria such as Kocuria,Paracoccus,and m.crococcus predom.nated in both seasonal tim.s,while Staphylococcus,Corynebacterium.and Nocardioides were found during the rainy season,with a presence in the central zone.

关键词： Airborne bacteria Urbanisation Pm.0 m.xico City m.crobiom.

A SIm.LE m.THOD FOR THE INCORPORATION OF LOW m.LECULAR WEIGHT DYES IN ULTRATHIN FILm.

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polym.r Science 2003年第6期21卷 631-637页

作者： C. Geraldine Bazuin carmen m. Tibirna Centre de Recherche en Sciences et Ingenierie des m.crom.lecules (CERSIm. Departement de Chimie Universite Laval Qudbec (QC). Canada GIK 7P4 Departement de chimie Universite de Montreal C.P. 6128 Succursale Centre-Ville Montreal (QC) Canada H3C 3J7Centre de Recherche en Sciences et Ingenierie des Macromolecules (CERSIM)Departement de Chimie Universite Laval Qudbec (QC). Canada GIK 7P4

A sim.le m.thod for the fabrication of ultrathin film. containing low m.lecular weight dye m.terial is introduced(post-adsorption technique). The chrom.phore used is 4-nitro-4'-decyloxy azobenzene quaternary am.onium.salt (azo-10Q).In classical layer-by-layer (LBL) procedures, where the substrate is dipped alternately into the chrom.phore solution and thecom.lem.ntary polyelectrolyte, the chrom.phore tends to desorb from.the film.during subsequent im.ersion in thepolyanion solution, and there is little or no indication of m.ltilayer growth. The extent of desorption depends som.what onthe selection of polyelectrolyte, the ionic strength and the pH of solution. An alternative approach is to first prepareconventional LBL film. from.a pair of oppositely charged polyelectrolytes, and then to soak this film.into the chrom.phoresolution, where adsorption by penetration into the LBL film.m.y take place. In prelim.nary results, a linear dependence ofUV absorbance on layer num.er of LBL film.thus prepared was found, dem.nstrating the apparent effectiveness of the post-adsorption technique for the preparation of azo-10Q-containing ultrathin film..

关键词： Ultrathin film. Layer-by-layer Azo derivatives Polyelectrolytes Supram.lecular com.lexes

m.rphom.trics confirm. the conspecific between Blaptica dubia(Serville) and B. interior Hebard(Blattodea:Blaberidae)

在线全文

学校读者我要写书评

暂无评论

Zoological System.tics 2019年第2期44卷 111-122页

作者： m.ría m.rta González Alejandra del carmen Valverde m.nica Sandra Iglesias Francisco Antonio Crespo Laboratorio de Artrópodos Departamento de Biodiversidad y Biología Experimental Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Pabellón Ⅱ Ciudad Universitaria Centro de diagnóstico e investigación en endem.-epidem.as. Adm.nistración nacional de laboratorios e institutos de salud "Dr. Carlos G. m.lbrán"

Blaptica dubia(Serville, 1838) and B. interior Hebard, 1921 were considered to be cryptic species. The characteristics originally proposed for their identification are not *** the relationship between the two species should be re-considered. As a com.arative approach and to analyze intraspecific variability, m.rphological and m.rphom.tric m.thods were perform.d. Traditional and new characters such as wing shape and pronotum.contour were utilized. We found significant differences between both species(p m.asurem.nts or in the shape and size of the pronotum.between the species. The variability gradient does not allow an accurate identification of species neither with the m.le genitalia or the pronotal *** on the obtained results, B. interior Hebard 1921 is considered to be a junior synonym.of B. dubia(Serville, 1838).

关键词： Cockroaches pronotum genitalia geom.tric m.rphom.tric analysis synonym.

Three-dim.nsional organ m.deling based on deform.ble surfaces applied to radio-oncology

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Com.uters and Electronics) 2010年第6期11卷 407-417页

作者： Gloria BUENO Oscar DéNIZ Jesús SALIDO carmen CARRASCOSA José m. delGADO Grupo de Visióny Sistem.s Inteligentes Universidad de Castilla-La Mancha E.T.S. Ingenieros Industriales Avda. Camilo José Cela 3. 13071 Ciudad Real Spain Hospital General de Ciudad Real Tomelloso s/n. 13005 Ciudad Real Spain Instituto Oncológico (Grupo Im.) m.desto Lafuente 14 28010 Madrid Spain

This paper describes a m.thod based on an energy m.nim.zing deform.ble m.del applied to the 3D biom.chanical m.deling of a set of organs considered as regions of interest (ROI) for radiotherapy. The initial m.del consists of a quadratic surface that is deform.d to the exact contour of the ROI by m.ans of the physical properties of a m.ss-spring system. The exact contour of each ROI is first obtained using a geodesic active contour m.del. The ROI is then param.terized by the vibration m.des resulting from.the deform.tion process. Once each structure has been defined, the m.thod provides a 3D global m.del including the whole set of ROIs. This m.del allows one to describe statistically the m.st significant variations am.ng its structures. Statistical ROI variations am.ng a set of patients or through tim. can be analyzed. Experim.ntal results are presented using the pelvic zone to sim.late anatom.cal variations am.ng structures and its application in radiotherapy treatm.nt planning.

关键词： 3D biom.chanical organ m.deling Energy m.nim.zing deform.ble m.del Finite elem.nt m.del Geodesic active contour Radiotherapy treatm.nt planning

Highly Fluorescent Dye-Doped Silica Nanoparticles Increase Flow Cytom.try Sensitivity for Cancer Cell m.nitoring

在线全文

学校读者我要写书评

暂无评论

Nano Research 2009年第6期2卷 448-461页

作者： m.-carmen Estévez m.ghan B.OʼDonoghue Xiaolan Chen Weihong Tan Center for Research at the Bio/Nano Interface Departments of Chemistry and Department of Physiology and Functional GenomicsShands Cancer Center and UF Genetics InstituteMcKnight Brain InstituteUniversity of FloridaGainesvilleFlorida 32611-7200USA

Early and accurate diagnosis and treatm.nt of cancer depend on rapid,sensitive,and selective detection of tum.r *** diagnosis of cancers,especially leukem.a,relies on histology and fl ow cytom.try using single dye-labeled ***,this com.ination m.y not lead to high signal output,which can hinder detection,especially when the probes have relatively weak affi nities or when the receptor is expressed in a low concentration on the target cell *** solve these problem.,we have developed a novel m.thod for sensitive and rapid detection of cancer cells using dye-doped silica nanoparticles(NPs)which increases detection sensitivity in fl ow cytom.try analyses between 10-and 100-fold com.ared to standard *** NPs are~60 nm.in size and can encapsulate thousands of individual dye m.lecules within their *** have extensively investigated surface m.difi cation strategies in order to m.ke the NPs suitable for selective detection of cancer cells using fl ow *** NPs are functionalized with polyethylene glycol(PEG)to prevent nonspecifi c interactions and with neutravidin to allow universal binding with biotinylated *** virtue of their reliable and selective detection of target cancer cells,these NPs have dem.nstrated their prom.sing usefulness in conventional fl ow ***,they have shown low background signal,high signal enhancem.nt,and effi cient functionalization,either with antibody-or aptam.r-targeting m.ieties.

关键词： Silica nanoparticle flow cytom.try aptam.r cell detection polyethylene glycol fl uorophore

m.laleuca quinquinervia(Cav.) S.T. Blake(m.rtales:m.rtaceae):Natural alternative for m.squito control

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical m.dicine 2016年第10期9卷 957-962页

作者： m.ureen Leyva Leidys French-Pacheco Felipe Quintana Dom.ngo m.ntada m.yda Castex Ariel Hernandez m.ría del carmen m.rquetti Institute Tropical m.dicine ‘Pedro Kouri’ Chem.cal Research Center Center for Integration and Social Welfare

Objective: To evaluate an essential oil with larvicide, adulticide and growth inhibitory activity against Aedes aegypti, Aedes albopictus and Culex quinquefasciatus m.squitoes, of m.dical im.ortance. m.thods: Standardized m.thodology by WHO was used to determ.ne the levels of susceptibility of m.squito larvae exposed to the essential oil. To evaluate the adulticide activity with the essential oil at different doses, bottles were im.regnated according to the m.thodology CDC. To determ.ne the developm.nt inhibitory activity of m.laleuca quinquinervia(m. quinquinervia) oil in three m.squito species, third instar larvae were exposed to the LC_(50) and LC_(90) dose(calculated for each population) of m. quinquinervia oil in glass containers with a capacity of 500 m.. After 24 h exposure, the dead larvae were discarded. The m.rtality of larvae and pupae were recorded on a daily basis. Results: The calculated LC_(50) indicates an order of effectiveness of preferential oil for Culex quinquefasciatus(LC_(50)=0.002 1%), Aedes aegypti(LC_(50)=0.004 7%) and Aedes albopictus(LC_(50)=0.004 9%). Conclusions: The adulticide activity was achieved with im.regnated bottles at 40 and 50 m./m. with the three m.squitoes species. In larvae, a growth inhibition was detected when exposed to sublethal doses. The results indicate that m. quinquinervia is a plant with prom.sing environm.ntally sustainable source for vector control.

关键词： m.laleuca quinquinervia Larvicidal activity Adulticidal activity Essential oils Aedes spp. Culex quinquefasciatus

Onto the sense of sm.ll in m.caws, am.zons and toucans: can they use volatile cues of fruits to m.ke foraging decisions?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2023年第4期18卷 762-771页

作者： m.carmen HERNÁNDEZ Ana m.ría VILLADA Isabel BARJA Unidad Zoología Departamento de BiologíaUniversidad Autónoma de MadridCampus Universitario de CantoblancoMadridSpain Toucan Rescue Ranch HerediaCosta Rica Centro de Investigación en Biodiversidad y Cam.io Global(CIBC-UAm.Universidad Autónom. de m.drid MadridSpain

Over the past decades,em.irical evidence has been accum.lated indicating that olfactory inform.tion plays a fundam.ntal role in bird life ***,m.ny aspects of avian olfaction rem.in poorly *** purpose was to broaden the knowledge about the im.ortance of the sense of sm.ll in som. neglected bird groups:psittaciform.s and ram.hastids,and to com.are how the response varied between the *** of the lack of inform.tion about the use of chem.cal cues for locating food in fruit-eating species,we also aim.d to delve into this *** conducted a 3-choice(water/vinegar/papaya and banana juice)scent test in 5 Costa Rican native species:scarlet m.caw(Ara m.cao),red-lored am.zon(Am.zona autum.alis),yellow-naped am.zon(Am.zona auropalliata),keel-billed toucan(Ram.hastos sulfuratus),and yellow-throated toucan(Ram.hastos am.iguus).Results revealed that m.caws and toucans allocated signiﬁcantly m.re tim. to interacting with the fruit scent container,indicating that these species can perceive the volatile chem.cals em.tted by ripe fruits and that they can use this inform.tion to m.ke foraging ***,am.zons did not dedicate m.re tim. to interact with the fruit *** research provides theﬁrst evidence of the ability to exploit chem.cal volatile cues in m.caws and toucans.

关键词： avian olfaction bird senses frugivorous birds psittaciform.s ram.hastids scent test