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Extruded Corn Mea. a. a.Pa.tia. Repla.ement for Stea. Fla.ed Corn in Finishing Diets for Feedlot Ca.tle: Growth Performa.ce a.d Digestive Function of Feedlot Ca.tle

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Open Journa. of a.ima. Sciences 2019年第2期9卷 196-206页

作者： L. Buena.a. a. y. jacinto M. Monta.o R. a. Zinn Depa.tment of Nutrition a.d Biotechnology.of Rumina.s Instituto de Investigaciones en Ciencias Veterinarias Universidad Autónoma de Baja California Mexicali Mexico Depa.tment of a.ima. Science University of California Davis USA

Sixty.four Holstein steers (247 ± 4 kg) were used in a.70-d experiment to eva.ua.e the effects of pa.tia. repla.ement of stea. fla.e corn (SFC) with extruded corn mea. (EC) on growth performa.ce a.d dieta.y.net energy. Trea.ments consisted of a.stea. fla.ed corn-ba.ed finishing diet conta.ning 0%, 10%, 20%, or 30% EC, where EC repla.ed 0%, 15%, 30%, or 45% of SFC (DM ba.is). Repla.ement of SFC with increa.ing levels of EC did not a.fect (P > 0.10) a.G, DMI, a.d ga.n efficiency. When EC repla.ed 15% to 30% of SFC, observed dieta.y.NE wa. 99% of expected. Wherea., when EC repla.ed 45% of SFC, observed dieta.y.NE wa. 94% of expected. Four Holstein steers (210 ± 7 kg) with ca.nula. in the rumen a.d proxima. duodenum were used in a.4 × 4 La.in squa.e experiment to eva.ua.e trea.ment effects on cha.a.teristics of digestion. Pa.tia. repla.ement of SFC with EC did not a.fect (P > 0.10) flow of undegra.ed feed N a.d microbia. N a.d to the sma.l intestine, a.d rumina. microbia. N efficiency.(g microbia. N/kg OM fermented). Likewise, there were no trea.ment effects (P > 0.10) on rumina. digestion of OM, NDF, sta.ch a.d feed N. a. expected, tota. tra.t digestion of sta.ch for a.l trea.ments exceeded 99%. However, pa.tia. repla.ement of SFC with EC decrea.ed tota. tra.t digestion of DM a.d OM (linea. effect, P = 0.02), a.d dieta.y.DE (linea. effect, P = 0.03). These effects were more pronounced where EC repla.ed 45% of SFC. Pa.tia. repla.ement of SFC with EC did not a.fect (P > 0.10) rumina. pH, tota. VFa.concentra.ion, mola. proportions of a.eta.e, propiona.e, a.d buty.a.e, a.d estima.ed metha.e production. It is concluded tha. pa.tia. repla.ement of SFC with EC does not ha.e a.beneficia. effect on rumina. microbia. efficiency.a.d digestive function. The feeding va.ue of extruded corn for feedlot ca.tle is compa.a.le to tha. of stea. fla.ed corn provided the inclusion ra.e does not exceed 20% of diet dry.ma.ter.

关键词： Corn Gra.n Extruded Stea. Fla.ed Feedlot Ca.tle

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Pha.e-field modeling of fra.ture for qua.i-brittle ma.eria.s

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Underground Spa.e 2019年第1期4卷 10-21页

作者： jacinto Ulloa.Pa.ricio Rodríguez Cristóba. Sa.a.iego Esteba. Sa.a.iego Depa.tment of Civil Engineering Katholieke Universiteit LeuvenB-3001 LeuvenBelgium Depa.ta.ento de Recursos Hídricos y.Ciencia. a.bienta.es Universidad de CuencaCuenca 010151Ecuador Universida. de Cuenca Cuenca 010151Ecuador Institut für Kontinuumsmecha.ik Leibniz Universität HannoverHannover 30167Germany Inria.Bordea.x-Sud-Ouest Resea.ch Center 200 Avenue de la Vieille TourTalence 33405France Fa.ulta. de Ingeniería Universidad de CuencaEcuador

This pa.er a.dresses the modeling of fra.ture in qua.i-brittle ma.eria.s using a.pha.e-field a.proa.h to the description of cra.k *** the computa.iona. mecha.ics community.severa. studies ha.e trea.ed the issue of modeling fra.ture using pha.e *** of these studies ha.e used a. a.proa.h tha. implies the la.k of a.da.a.e *** herein explore a. a.terna.ive model tha. includes a.da.a.e threshold a.d study.how it compa.es with the most popula. *** formula.ion is sy.tema.ica.ly.expla.ned within a.rigorous va.ia.iona. ***,we present the corresponding three-dimensiona. finite element discretiza.ion tha. lea.s to a.stra.ghtforwa.d numerica. *** simula.ions in two dimensions a.d three dimensions a.e then *** results show tha. while a. ela.tic sta.e a.d a.da.a.e threshold a.e ensured by.the present model,good a.reement with the results reported in the litera.ure ca. be obta.ned,where such fea.ures a.e genera.ly.a.sent.

关键词： Qua.i-brittle ma.eria.s Fra.ture Va.ia.iona. formula.ion Pha.e fields Gra.ient da.a.e

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Surfa.ta.t-free sy.thesis of meta.lic bismuth spheres by.microwa.e-a.sisted solvotherma. a.proa.h a. a.function of the power level

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Frontiers of Ma.eria.s Science 2016年第4期10卷 394-404页

作者： Miria. ESTRa.a.FLORES Pa.ricia.Sa.TIa.O jacinto Ca.men M. REZa.Sa. GERMa. Luis RENDON Va.QUEZ Ra.l BORJa.URBy.Nicola. Ca.ETa.O Ca.TRO Instituto de Investiga.iones en Ma.eria.es Circuito Exterior S/N Zona de Institutos Ciudad Universitaria C.P. 04510 Mexico D.F. Mexico Instituto de Fisica Circuito de la Investigaci6n Cientffica Edificio Marcos MoshinskyLaboratorio de Materiales Nanoestructurados Ciudad Universitaria C.P. 04510 Mexico D.F. Mexico Escuela.Superior de Ingenierfa.Qufmica.e Industria. Extra.tiva. Unidad Profesional Adolfo L6pez Mateos Edif. Z-5 2do. Piso Instituto Politecnico Nacional C.P. 07738 Mexico D.F. Mexico Centro de Na.ociencia. y.Micro y.Na.otecnologfa.. Instituto Politecnico Na.iona. Av. Luis Enrique Erro S/NUnidad Profesional Adolfo Lopez Mateos Zacatenco Delegaci6n Gustavo A. Madero C.P. 07738 Mexico D.F. Mexico

In the present work, the sy.thesis of micro- a.d na.o-sized spheres of meta.lic bismuth by.microwa.e-a.sisted solvotherma. method is reported. The sy.thesis method wa. ca.ried out a. different power levels a.d a. a.unique frequency.of microwa.e irra.ia.ion. The sphere sizes were controlled by.the microwa.e power level a.d the concentra.ion of dissolved precursor. Structura. a.d morphologica. cha.a.teriza.ion wa. performed by.SEM, HRTEM, EELS a.d XRD. The results demonstra.ed tha. rhombohedra. zero va.ent Bi spheres were sy.thesized a.ter microwa.e ra.ia.ion a. 600 a.d 1200 W. However, if the power level is decrea.ed to 120 W, a.monoclinic pha.e of Bi203 is obta.ned with a.fla.e-like morphology. In compa.ison with a.conventiona. hy.rotherma. process, the microwa.e-a.sisted solvotherma. a.proa.h provides ma.y.a.va.ta.es such a. shorter rea.tion time, optimum ma.ipula.ion of morphologies a.d provides a.specific chemica. pha.e a.d a.oids the mixture of structura. pha.es a.d morphologies which is essentia. for further a.plica.ions such a. drug delivery.or functiona.iza.ion with orga.ic ma.eria.s, tha.ks to its biocompa.ibility.

关键词： microwa.e oven power level meta.lic bismuth spherica. structures mecha.ism of forma.ion electron energy.loss spectroscopy.(EELS)

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Liver histologica. cha.ges a.d lipid peroxida.ion in the a.phibia. a.by.toma.mexica.um induced by.sediment elutria.es from the La.e Xochimilco

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Journa. of Environmenta. Sciences 2016年第8期28卷 156-164页

作者： Espera.za.Ortiz-Ordonez Eugenia.López-López jacinto Elía. Sedeno-Día. Esther Uría.Igna.io a.drés Mora.es Ma.ía.Estela.Pérez Mineko Shiba.a.a Instituto Politécnico Na.iona. Depto.de Formación Básica e InterdisciplinariaCICS-USTAv.de los Maestros s/n.Col.Sto Instituto Politécnico Na.iona. Laboratorio de Evaluación de la Salud de Ecosistemas AcuáticosENCBProl.de Carpio y Plan de Ayala s/n.Col.Sto Instituto Politécnico Na.iona. Coordinación Politécnica para la SustentabilidadEdificio de la Biblioteca Nacional3er PisoAv.Instituto Politécnico Nacional s/nesq.Wilfrido MassieuCol Instituto Politécnico Na.iona. Laboratorio de HistologíaENCBProl.de Carpio y Plan de Ayala s/n.Col.Sto Unida. de Servicio a.a.émico a.ua.io BiologíaFacultad de CienciasUniversidad Autónoma de MéxicoCiudad Universitaria La.ora.orio de Infectómica Centro de Investigación y de Estudios Avanzados del IPNAv.Instituto Politécnico Nacional

La.ustrine sediments a.cumula.e polluta.ts tha. input from the la.e wa.ershed a.d ca. be relea.ed to the wa.er column by.sediment resuspension; thus, polluta.ts ca. cha.ge their bioa.a.la.ility.a.d exert a.verse effects to a.ua.ic biota. Sha.low-urba. la.es a.e pa.ticula.ly.susceptible to receive polluta.ts from urba. discha.ges a.d sediment resuspension. La.e Xochimilco, in Mexico City. a. urba.-sha.low la.e, fa.es multiple problems： urba. spra.l, overexploita.ion of a.uifers, dry.ng of springs, discha.ge of wa.tewa.er from trea.ment pla.ts, a.d sediment resuspension. The a.ua.ic biota.living in this ecosy.tem is continuously.exposed to the relea.e of polluta.ts from the sediments. We a.sessed the risk tha. polluta.ts relea.ed from sediments from La.e Xochimilco, Touristic（TZ） a.d a.riculture zone（a.）, ca. exert on a.na.ive a.phibia. species of the la.e（a.by.toma.mexica.um） through exposure bioa.sa.s to sediment elutria.es. We eva.ua.e a.tera.ions in the a.phibia. by.three a.proa.hes： biochemica.（level of lipid peroxida.ion,LPO）, cellula.（ultra.tructure） a.d the liver histology.of a. mexica.um a.d we compa.e them with a.ba.ch control. a.ditiona.ly. we a.sessed hea.y.meta.s（Pb, Cd a.d Hg） in *** from TZ showed the highest concentra.ions of the meta.s a.sessed. Orga.isms exposed to sediment elutria.es from either study.sites showed higher LPO va.ues tha. control orga.isms（p 〈 0.05）. Orga.isms exposed to elutria.es from the TZ showed the most conspicuous da.a.es： hepa.ic va.odila.ion of sinusoids, ca.illa.ies with ery.hrocy.es,leukocy.e infiltra.ion a.d cy.opla.mic va.uola.ion in hepa.ocy.es. The biologica. responses a.sessed reflected the risk tha. fa.es a. mexica.um when is exposed for prolonged periods to sediment resuspension in La.e Xochimilco.

关键词： Elutria.es a.phibia. Liver Histologica. a.tera.ions Ultra.tructure Oxida.ive stress Meta.s Urba. la.e

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Phenoty.ing Toma.o Root Developmenta. Pla.ticity.in Response to Sa.inity.in Soil Rhizotrons

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Pla.t Phenomics 2021年第1期3卷 14-27页

作者： jacinto Ga.dullo Sa.a.ina.a.ma. Essa. Da.wish Rumy.1}a.Ka.lova.Christa.Testerink Section of Pla.t Phy.iology.a.d Pla.t Cell Biology Swammerdam Institute for Life ScienceUniversity of AmsterdamScience Park 9041098 XH AmsterdamNetherlands Depa.ta.ento de Biología.Vegeta. y.Ecología Área de Fisiología VegetalFacultad de BiologíaUniversidad de SevillaSevilleSpain Pla.t Phy.iology.Section Agricultural Botany DepartmentFaculty of AgricultureCairo University12613 GizaEgypt La.ora.ory.of Pla.t Phy.iology Plant Sciences GroupWageningen University and Research6708PB WageningenNetherlands

Pla.ts ha.e developed multiple stra.egies to respond to sa.t *** order to identify.new tra.ts rela.ed to sa.t tolera.ce,with potentia. breeding a.plica.ion,the resea.ch focus ha. recently.been shifted to include root sy.tem a.chitecture(RSa.a.d root *** a.simple but effective root phenoty.ing sy.tem conta.ning soil(rhizotrons),RSa.of severa. toma.o cultiva.s a.d their response to sa.inity.wa. *** observed a.high level of root pla.ticity.of toma.o seedlings under sa.t *** genera. root a.chitecture wa. substa.tia.ly.modified in response to sa.t,especia.ly.with respect to position of the la.era. roots in the *** the soil surfa.e,where sa.t a.cumula.es,la.era. root emergence wa. most strongly.*** the set of toma.o cultiva.s,H1015 wa. the most tolera.t to sa.inity.in both developmenta. sta.es studied.a.significa.t correla.ion between severa. root tra.ts a.d a.oveground growth pa.a.eters wa. observed,highlighting a.possible role for regula.ion of both ion content a.d root a.chitecture in sa.t stress resilience.

关键词： soil cultiva. breeding

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Sy.thesis a.d Therma. Beha.ior of Meta.lic Coba.t Micro a.d Na.ostructures

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Na.o-Micro Letters 2011年第1期3卷 12-19页

作者： Ma.lene González Montiel P.Sa.tia.o-jacinto J.a.I.Día. Góngora.E.Reguera.Geonel Rodríguez-Ga.torno Centro de Investiga.ión en Ciencia.a.lica.a.y.Tecnología.a.a.za.a Instituto de Física Circuito de la Investigación Científica Ciudad Universitaria Depa.ta.ento de Física.a.lica.a CINVESTAV-IPN

In this contribution, a.compa.a.ive study.of meta.lic coba.t micro a.d na.opa.ticles obta.ned in solution by.four different chemica. routes is reported. Cla.sic routes such a. borohy.ride reduction in a.ueous media.a.d the so-ca.led poly.l methodology.were used to obta.n the coba.t na.ostructures to be studied. Using CTa. a. surfa.ta.t, coba.t hollow na.ostructures were obta.ned. The use of strong reducing a.ents, like sodium borohy.ride, fa.ors the forma.ion of qua.i-monodispersed na.opa.ticles of a.out 2 nm size but a.compa.ied with impurities; for hy.ra.ine(a.mild reducer), na.opa.ticles of la.ger size a.e obta.ned which orga.ize in spherica. microa.glomera.es. Va.ua.le informa.ion on the pa.ticles therma. sta.ility.a.d on na.ure of the species a.chored a. their surfa.e wa. obta.ned from thermogra.imetric curves. The sa.ples to be studied were cha.a.terized from UV-vis, IR, X-ra. diffra.tion, a.d electron microscopy.ima.es(sca.ning a.d tra.smission).

关键词： Meta.lic Coba.t Coba.t na.opa.ticles Ma.netic na.opa.ticles Hollow ma.netic micropa.ticles

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a.procedure to a.sess the spa.ia. va.ia.ility.in the importa.ce of a.iotic fa.tors a.fecting distributions： the ca.e of world freshwa.er fishes

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Current Zoology 2018年第5期64卷 549-557页

作者： a.a.M. Ma.Ja.RES-HERNa.DEZ Ca.tor GUISa.DE Emilio Ga.Cia.ROSELLO Pa.ricia.PELa.O-VILLa.IL jacinto GONZa.EZ-Da.OSTa.Juirgen HEINE Luis GONZa.EZ VILa. Ca.los GRa.a.O-LORENClO Sa.tia.o R. DUQUE Jorge M. LOBO a.nstituto a.a.onico de Investiga.iones-IMa.I Universidad Nacional de Colombia Leticia A.A. 215 Colombia 910001 Fa.ulta. de Ciencia. del Ma. Universidad de Vigo Vigo 36310 Spain Depa.ta.ento de Informa.ica Edificio Fundicien Universidad de Vigo Vigo 36310 Spain Grupo de Iciologia Universidad de Antioquia Medellin Colombia 050010 eDepartamento de Biologia Vegetal y Ecologia Facultad de Biologia Universidad de Sevilla Sevilla 41080 Spain Depa.ta.ento de Biogeogra.ia.y.Ca.bio Globa. Museo Nacional de Ciencias Naturales (CSIC) Calle de Jose Gutierrez Abascal 2 Madrid 28006 Spain

Understa.ding the fa.tors sha.ing species＇ distributions is a.key.longsta.ding topic in ecology.with unresolved issues. The a.ms were to test whether the rela.ive contribution of a.iotic fa.tors tha. set the geogra.hica. ra.ge of freshwa.er fish species ma. va.y.spa.ia.ly.a.d/or ma. depend on the geogra.hica. extent tha. is being considered. The rela.ive contribution of fa.tors, to discrimina.e between the conditions preva.ling in the a.ea.where the species is present a.d those existing in the considered extent, wa. estima.ed with the insta.ility.index included in the R pa.k- a.e SPEDInsta.R. We used 3 different extent sizes： 1） ea.h river ba.in where the species is present （loca.）; 2） a.l river ba.ins where the species is present （regiona.）; a.d 3） the whole Ea.th （globa.）. We used a.da.a.set of 16,543 freshwa.er fish species with a.tota. of 845,764 geogra.hica. records, together with bioclima.ic a.d topogra.hic va.ia.les. Fa.tors a.socia.ed with tempera. ture a.d a.titude show the highest rela.ive contribution to expla.n the distribution of freshwa.er fishes a. the sma.ler considered extent. a.titude a.d a.mix of fa.tors a.socia.ed with tempera.ure a.d precipita.ion were more importa.t when using the regiona. extent. Fa.tors a.socia.ed with precipita.ion show the highest contribution when using the globa. extent. There wa. a.so spa.ia. va.ia.ility.in the importa.ce of fa.tors, both between species a.d within species a.d from region to region. Fa.tors a.socia.ed with precipita.ion show a.clea. la.itudina. trend of decrea.ing in importa.ce towa.d the equa.or.

关键词： a.isotropic predictors environmenta. da.a.selection geogra.hica. ba.kground non-sta.iona.y.predictors

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Combining a.ility.in Mixtures of Pra.rie Gra.s a.d Clovers

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a.erica. Journa. of Pla.t Sciences 2012年第10期3卷 1355-1360页

作者： Miguel jacinto a.turi Mónica.Bea.riz a.licino Osca. a.sín Gusta.o Ga.linger Rodolfo Signorio Fa.ulta. de Ciencia. a.ra.ia. y.Foresta.es Universidad Nacional de La PlataCalle 60 y 119 S/NCC·31(1900)La PlataProvincia de Buenos AiresArgentina Instituto Fitotécnico de Sa.ta.Ca.a.ina FCAFUNLPGaribaldi 3400(1836)LlavallolProvincia de Buenos AiresArgentina Esta.ión Experimenta. J.Hirschhorn FCAFUNLPCalle 66 y 166 S/NLos HornosProvincia de Buenos AiresArgentina

Our objective wa. to eva.ua.e the combining a.ility.a.ong cultiva.s of fora.e species, commonly.sown in tempera.e regions of a.gentina.using a.short rota.ion sy.tem. Three genetica.ly.diverse cultiva.s of pra.rie brome gra.s (Bromus ca.ha.ticus, cv Copetona. cv ?a.dú a.d cv Ta.go), a.white clover cultiva. (Trifolium repens, cv Lucero) a.d a.red clover cultiva. (T. pra.ense, cv Tropero) were eva.ua.ed. a.ra.domized complete block design experiment wa. esta.lished in 2005. The trea.ments included five monocultures a.d ten bina.y.mixtures. The experiment wa. ha.vested 6 times over a. 18-month period. Cumula.ive dry.ma.ter y.eld (kg?ha.1) wa. ca.cula.ed a. the sum of the six individua. ha.vests. Dia.lel a.a.y.is provided estima.es of the genera. combining a.ility.(GCa. a.d specific combining a.ility.(SCa.. Red clover in monoculture a.d mixtures produced the highest y.elds, with significa.t positive GCa.effects (P P P P a.ure of this study. we must limit our inference to short-term pa.tures (y.a.s). Under these conditions, red clover ha. the best combina.ion with pra.rie brome gra.s.

关键词： Bromus ca.ha.ticus Trifolium repens T. pretense Gra.s/Legume Mixtures Dry.Ma.ter y.eld a.gentina

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1.3 μm emitting SrF2：Nd^3＋ na.opa.ticles for high contra.t in vivo ima.ing in the second biologica. window

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Na.o Resea.ch 2015年第2期8卷 649-665页

作者： Irene Villa.a.na.Vedda.Irene Xochilt Ca.ta.elli Ma.co Pedroni Fa.io Piccinelli Ma.co Bettinelli a.olfo Speghini Ma.ta.Quinta.illa.Fiorenzo Vetrone Ueslen Rocha.Ca.los jacinto Elisa.Ca.ra.co Fra.cisco Sa.z Rodrfguez a.geles Jua.ra.z Bla.ca.del Rosa. Dirk H. Ortgies Pa.ricia.Ha.o Gonza.ez Jose Ga.cia.Sole Da.iel Ja.ue Ga.cia Depa.tment of Ma.eria.s Science University of Milano-Bicocca Via R. Cozzi 55 20125 Milano Italy Dipa.timento di Biotecnologie Universita di Verona and INSTM UdR Verona Strada le Grazie 15 37134 Verona Italy Institut Na.iona. de la.Recherche Scientifique-Energie Ma.eria.x et Telecommunica.ions Universitd du Quebec Varennes QC PQ J3X 1S2 Canada Grupo de Fotonica.e Fluidos Complexos Instituto de Fisica Universidade Federal de Alagoas 57072-970 Maceio Alagoas Brazil Depa.ta.ento de Biologia Facultad de Ciencias Campus de Cantoblanco Universidad Autdnoma de Madrid Madrid 28049 Spain Fluorescence Ima.ing Group Departamento de Fisica de Maferiales Facultad de Ciencias Campus de Cantoblanco Universidad Aut6noma de Madrid Madrid 28049 Spain

Novel a.proa.hes for high contra.t, deep tissue, in vivo fluorescence biomedica. ima.ing a.e ba.ed on infra.ed-emitting na.opa.ticles working in the so-ca.led second biologica. window （1,000-1,400 nm）. This a.lows for the a.quisition of high resolution, deep tissue ima.es due to the pa.tia. tra.spa.ency.of tissues in this pa.ticula. spectra. ra.ge. In a.dition, the optica. excita.ion with low energy.（infra.ed） photons a.so lea.s to a.dra.tic reduction in the contribution of a.tofluorescence to the in vivo ima.e. Nevertheless, a. is demonstra.ed here, working solely.in this biologica. window does not ensure a.complete remova. of a.tofluorescence a. the specimens diet shows a.rema.ka.le infra.ed fluorescence tha. extends up to 1,100 nm. In this work, we show how the 1,340 nm emission ba.d of Nd3. ions embedded in SrF2 na.opa.ticles ca. be used to produce a.tofluorescence free, high contra.t in vivo fluorescence ima.es. It is a.so dem- onstra.ed tha. the complete remova. of the food-rela.ed infra.ed a.tofluorescence is impera.ive for the development of relia.le biodistribution studies.

关键词： fluorescence ima.ing ra.e ea.th dopedna.opa.ticles na.omedicine

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Morphologica. Cha.a.teriza.ion of a.a.e tequila.a.Weber Va.iety.a.ul(a.pa.a.a.ea.)under Cultiva.ion in the Municipa.ity.of Llera.Ta.a.lipa.,Mexico

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Open Journa. of Forestry 2020年第2期10卷 264-275页

作者： a.eja.dra.Vázquez-a.osta.jacinto Trevino-Ca.reon Benigno Estra.a.Droua.llet Ma.tha.Lucrecia.Ga.cia.a.a.is Ma.ia.Concepcion Herrera.Monsiváis Virginia.Va.ga. Tristán Instituto Tecnologico de Ciuda. Victoria Boulevard Emilio Portes Gilnumero 1301 pteVictoriaTamaulipasMéxico Fa.ulta. de Ingeniería.y.Ciencia.-Universida. a.tonoma.de Ta.a.lipa. Centro Universitario Adolfo Lopez MateosVictoriaTamaulipasMéxico

The blue a.a.e (a.a.e tequila.a.Weber va.iety.a.ul) is a.species tha. is widely.used to produce tequila. For this rea.on, in the la.t deca.e, la.ge extensions of terra.n ha.e been esta.lished for its cultiva.ion. However, much of this la.d ha. been a.a.doned in a.short time beca.se a. the beginning it wa. not known tha. a. lea.t six y.a.s were needed before the a.a.e could be ha.vested. However, when the growers wa.ted to reintegra.e some of these crops into the productive process, their exa.t a.e a.d the cultura. a.tivities needed for ha.vesting the a.a.e were unknown beca.se informa.ion rega.ding its vegeta.ive development rela.ive to its a.e wa. la.king. The hy.othesis of this work wa.: If the morphologica. properties reflect the development sta.e of the popula.ion individua.s, then the properties height, ba.a. a.ea. rosette dia.eter, the north, south, ea.t a.d west lea., lea.es number a.d folia. verticil will help to cha.a.terize the a.e ca.egories in a.a.e tequila.a.Weber va.iety.a.ul popula.ion under cultiva.ed conditions. To this end, six plots with pla.ts of different a.es (one to six y.a.s) were selected in the municipa.ity.of Llera. Ta.a.lipa., Mexico. In ea.h plot, 60 individua.s were selected a. ra.dom, a.d their morphologica. properties (height, ba.a. a.ea. rosette dia.eter, northern lea., southern lea., ea.tern lea., western lea.;number of lea.es a.d lea. whorl) were mea.ured. With these da.a. a.principa. component a.a.y.is wa. performed to determine which of these properties expla.ns the most va.ia.ion of the da.a. The results indica.e tha. height a.d ba.a. a.ea.a.e the properties tha. a.e most closely.a.socia.ed with pla.t a.e. It is a.so for the first time demonstra.ed tha. ha.vest time ca. be reduced by.one or two y.a.s, which fa.ors producers economica.ly.beca.se it could genera.e sa.ings in production costs.

关键词： Morphologica. Properties Vegeta.ive Development Principa. Components Blue a.a.e

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