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A Characterization of Generalized Monotone normed Cones

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Acta Mathematica Sinica,English Series 2007年第6期23卷 1067-1074页

作者： S.ROMAGUERA E.A.SnCHEZ-PREZ O.VALERO Escuela de Caminos Departamento de Matemdtiea Aplicada Universidad Politdcnica de Valencia46071 ValenciaSpain departamento de Ciencias Matématicas e Informática Universidad de las Islas BalearesEdificio Anselm Turmeda07122 PalmaBalearesSpain

Let C be a cone and consider a quasi-norm p defined on it. We study the structure of the couple （C, p） as a topological space in the case where the function p is also monotone. We characterize when the topology of a quasi-normed cone can be defined by means of a monotone norm. We also define and study the dual cone of a monotone normed cone and the monotone quotient of a general cone. We provide a decomposition theorem which allows us to write a cone as a direct sum of a monotone subcone that is isomorphic to the monotone quotient and other particular subcone.

关键词： quasi-norm monotone cones

Effect of interfacial properties on mechanical stability of ash deposit

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第2期8卷 187-197页

作者： A.Ontiveros-Ortega J.A.Moleon I.Plaza C.Guillén department of Physics Campus Universitario de las Lagunillas s/nEdificio A-3University of JaénJaén23071Spain Instituto Andaluz de Geofísica University of GranadaGranada18071Spain department of Geography Campus Universitario de Guajara s/nUniversity of La LagunaIslas Canarias38071Spain

The paper presents a study on the cohesion of volcanic ash particles using surface free energy determination and zeta potential *** is a subject of great interest in physical volcanology,as many researches on volcanic particle aggregation are frequently *** this case,special attention is paid to the role of structural or hydration forces between hydrophilic surfaces,which are a consequence of the electron-donor/electron-acceptor character of the *** this point of view,the results are potentially interesting as they could give valuable insights into this *** results are presented in terms of the total energy of interaction between dispersed particles,computed from the extended DLVO *** to the total free energy of interaction were determined from the zeta potential and surface free energy of ash,measured under different experimental *** samples of basaltic volcanic ash(black and white)with silica contents of 44% and 63% respectively are *** surface free energy and zeta potential were analysed for ashes immersed in different electrolytes(naCl,CaCl,FeCl).The presence of electrolytes changes the surface properties of the solid *** analysis of total interaction energy between the ash particles in aqueous medium shows that soil cohesion strongly depends on ash surface properties,chemical nature,the adsorbed cation on the surface,and p H value.

关键词： Zeta potential Surface free energy Volcanic ash deposits stability El Hierro Island

OSCILLATIOn AnD VARIATIOn OF THE LAGUERRE HEAT AnD POISSOn SEMIGROUPS AnD RIESZ TRAnSFORMS

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Acta Mathematica Scientia 2012年第3期32卷 907-928页

作者： J.J.Betancor R.Crescimbeni J.L.Torrea departamento de An'aisis Matema'ico Universidad de La Laguna38271-La LagunaTenerifeIslas CanariasSpain departamento de Matema'ica Universidad Nacional del ComahueBuenos Aires 14008300 Neuqu'enArgentina departamento de Matem'aticas Facultad de CienciasUniversidad Auto'noma de Madrid28049 MadridSpain

In this article, we study LP-boundedness properties of the oscillation and vari- ation operators for the heat and Poissson semigroup and Riesz transforms in the Laguerre settings. Also, we characterize Hardy spaces as... 详细信息

关键词： Oscillation variation heat Laguerre semigroup Riesz transforms

Hypertension effects on p73 expression in the rat circumventricular organs and cerebrospinal fluid

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World Journal of neuroscience 2012年第2期2卷 68-73页

作者： Emilia M.Carmona-Calero Ibrahim González-Marrero Manuela Castaneyra-Martin Juan M.Gonzalez-Toledo Leandro Castaneyra-Ruiz Hector de Paz-Carmona Agustín Castaneyra-Ruiz Lidia Ruiz-Mayor Agustín Castaneyra-Perdomo departamento de Anatomía Facultad de MedicinaUniversidad de La LagunaTenerifeIslas CanariasSpain departamento de Biotecnología Instituto de Investigacion y Ciencias de Puerto del RosarioFuerteventuraIslas CanariasSpain

It has been reported that spontaneously hypertensive rats (SHR) show ventricular dilation, changes in CSF proteins and variations in the circumventricular organs (CVO) such as: the subcommissural organ (SCO), the subfornical organ (SFO) and the area postrema (AP) which are located in the walls of the third and fourth ventricles. On the other hand, p73 proteins are present in cells of the central nervous system (CnS) such as circumventricular structures and the neuroepithelium which are altered in ventricular dilation. The purpose of the present work is to study the TAp73 isoform expression in the circumventricular organs (CVO) and their variations in ventricular dilatation and arterial hypertension. Brains and cerebrospinal fluid (CSF) from control Wistar-Kyoto rats (WKY) and SHR were used. The paraffin sections containing the CVO were immunohistochemically proc-essed with anti-TAp73 and by western blot, p73 bands in the CSF and circumventricular organ extract were also identified. The western blot study showed bands marked with p73 in the CSF and CVO, the p73 band expression was bigger in the SHR than in the WKY rats. We also found stronger markings in the SFO, SCO and AP of the hypertensive rats than in the WKY rats. It could be concluded that hypertension in the SHR produces altera-tions in the relationship between the p73 protein, circumventricular structures and CSF.

关键词： Circumventricular Organs p73 CSF Hypertensive Rats

Inflammatory effect on the gastrointestinal system associated with COVID-19

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World Journal of Gastroenterology 2021年第26期27卷 4160-4171页

作者： Paulina delgado-Gonzalez Carlos A Gonzalez-Villarreal Jorge A Roacho-Perez Adriana G Quiroz-Reyes Jose Francisco islas Juan Luis delgado-Gallegos Daniel Arellanos-Soto Kame A Galan-Huerta Elsa n Garza-Treviño departamento de Bioquimica y Medicina Molecular UANLMonterrey 64610Nuevo LeónMexico Universidad de Monterrey UDEM Vicerrectoria de Ciencias de la SaludMonterrey 66238Nuevo LeonMexico

The severe acute respiratory syndrome-coronavirus-2(SARS-CoV-2)that causes coronavirus disease-2019(COVID-19)has provoked a global pandemic,mainly affecting the respiratory tract;however,a percentage of infected individuals can develop gastrointestinal(GI)*** studies describe the development of GI symptoms and how they affect the progression of *** this review,we summarize the main mechanisms associated with gut damage during infection by SARS-CoV-2 as well as other organs such as the liver and *** only are host factors associated with severe COVID-19 but intestinal microbiota dysbiosis is also observed in patients with severe disease.

关键词： SARS-CoV-2 Gastrointestinal symptoms COVID-19 Gastrointestinal system

Biogeographic diversification in nolana(Solanaceae),a ubiquitous member of the Atacama and Peruvian deserts along the western coast of South America

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Journal of Systematics and Evolution 2009年第5期47卷 457-476页

作者： Michael O.DILLOn Victor QUIPUSCOA SILVESTRE department of Botany The Field Museum1400 South Lake Shore DriveChicagoIL 60605USA departamento de Botánica Universidad Nacional de San Agustín

The present paper reconstructs the biogeographic diversification for nolana L.f.(Solanaceae),a genus of 89 endemic species largely restricted to fog-dependent desert lomas formations of coastal Peru and *** efforts have reconstructed a phylogenetic estimate for nolana using a combination of molecular ***,we expand on those results to examine hypotheses of biogeographic origins and diversification *** occupies habitats within a continuous coastal desert and forms a terrestrial archipelago of discrete "islands" unique in size,topography,and species *** locality contains at least one nolana species and many contain multiple species in *** genus has a Chilean origin,with the basal clades confined to Chile with wide geographic and ecological *** contains two strongly supported clades,suggesting two introductions with subsequent radiation.A Chilean clade of shrubby,small-flowered species appears to have had its origins from the same ancestors of the second line that radiated in Peru and northern *** galapagensis is endemic to the islas Gala’pagos,with origins traced to Peruvian taxa with a divergence time of 0.35 *** of diversification over the past 4.02 mya in nolana,in one of the driest habitats on Earth,suggest rapid adaptive radiation in several *** in nolana may be attributed to characters that confer a competitive advantage in unpredictable and water-dependent environments,such as succulent leaf anatomy and ecophysiology,and the reproductive mericarp unique to *** processes affecting or shaping the biota of western South America are discussed.

关键词： Atacama desert biogeography chloroplast DnA LEAFY second intron nolana Peruvian desert Solanaceae South America.

In Vitro Activity of Squaramides and Acyclic Polyamine derivatives against Trophozoites and Cysts of Acanthamoeba castellanii

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Journal of Biosciences and Medicines 2018年第8期6卷 1-14页

作者： M.J.Rosales M.Ximenis A.Costa C.Rotger D.Romero F.Olmo E.delgado M.P.Clares E.Garcia-Espana C.Marin MSanchez departamento de Parasitologia Facultad de CienciasUniversidad de GranadaGranadaSpain Universidad de las islas Baleares Palma de MallorcaSpain Universidad de Valencia ValenciaSpain

Pathogenic strains of Acanthamoeba cause keratitis (AK), granulomatous amoebic encephalitis (GAE), amoebic pneumonitis (AP), and skin infection in human and animals. The treatment of an Acanthamoeba infection is invariably very difficult and not always effective, and compounds that are amebicidic or amebistatic are frequently toxic and/or irritating for humans. Squaramides and polyamine derivatives have been demonstrated to have antitumor and antiprotozoal activity. The aim of this study was to investigate the activity of 5 squaramides and 5 acyclic polyamines against trophozoites and cysts of A. castellanii neff. Amoebicidal activity against the trophozoites and cytotoxicity against Vero cells were evaluated with a colorimetric assay, using Alamar Blue?, and chlorhexidine digluconate was assayed as the reference drug. The squaramides 3 and 5 and the acyclic polyamine 6 appeared to be the most active against the trophozoites and their cytotoxicity was low, showing selectivity indexes of 28.3, 26, and 25.7, respectively, similar to the control drug, chlorhexidine digluconate (27.6). But only the squaramide 3 showed complete cysticidal activity at the concentrations of 100 and 200 μM, as the chlorhexidine digluconate. Further studies of the mechanism of action and in vivo assays are needed, but squaramide 3 could be used for developing novel therapeutic approaches against Acanthamoeba infections.

关键词： Acanthamoeba Squaramides Acyclic Polyamines Amoebicidal Cysticidal

Masting effect on alpha and beta avian diversity in fragmented forests of relict?endangered Mexican Beech(Fagus grandifolia ***)

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Avian Research 2021年第4期12卷 576-590页

作者： Ernesto CRodríguez-Ramírez Levinn Camacho-islas Ana Paola Martínez-Falcón Isolda Luna-Vega Pilar Carbó-Ramírez Laboratorio de dendrocronología Universidad ContinentalHuancayoPerú Laboratorio de Biogeografía y Sistemática Universidad Nacional Autonoma de MéxicoCiudad de MéxicoMexico Centro de Investigaciones Biológicas Universidad Autónoma de Estado de HidalgoHidalgoMexico Independent Researcher OuluFinland

Background:Tropical montane cloud forests are one of the most important hotspots on Earth and show presence of relict-endemic and endangered species,representing about 14%of the total tropical forest *** seed production or masting in tropical montane cloud tree species is a widespread reproductive strategy of decidu-ous and evergreen broad-leaved tree associations to decrease costs of reproduction and ensure *** event maintains a high avian diversity,which can be modified by phenological process(seed production and non-seed production).Methods:The main aim of this study was to assess alpha and beta avian diversity and whether the composition of the trophic guild modifies among phenological processes and between two fragmented relict-endangered Mexican Beech(Fagus grandifolia ***)forests(Medio Monte and El Gosco)in the Mexican state of *** addi-tion,we evaluated beechnut ***:We recorded 36 bird species,11 of them included in some conservation risk status,and 5 endemic *** diversity values were dissimilar in avian richness(q=0)among phenological processes and between frag-mented beech *** communities among three phenological processes and between fragmented forests were structurally similar,dominated during immature seeds the Brown-backed Solitaire(granivores-insectivores-frugivores);during mature seeds the White-crowned Parrot(Pionus senilis,granivores-frugivores);and the Dwarf Jay(Cyanolyca nana,insectivores)was abundant during low seed *** complementarity index was high among phenological processes and low between *** found a high bird turnover value between immature seeds—mature seeds and during mature seeds—low seed ***,a similar pattern was recorded between the two study *** production showed a high number of undamaged beechnuts in Medio Monte,while in El Gosco beechnuts were attacked by ***:Our results reflect that masting

关键词： Avian seed consumers Bird species Synchronous seed production Tropical montane cloud forest Turnover Zentrygon albifacies

Microhardness,Microstructure and Electrochemical Efficiency of an Al(Zn/xMg) Alloy after Thermal Treatment

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Journal of Materials Science & Technology 2012年第3期28卷 255-260页

作者： Socorro Valdez M.Suarez O.A.Fregoso J.A.Juárez-islas Instituto de Ciencias Fisicas-UnAM Av.Universidad S/N Col.Chamilpa062210CuernavacaMorelosMéxico Instituto de Investigaciones en Materiales-UnAM Circuito escolar S/NCd.Universitaria04515MéxicoD.F.México

The influence of Mg on the microhardness,microstructure and electrochemical efficiency of Al（Zn/xMg） alloys have been ***（Zn/xMg） alloys were prepared by metal mould casting method to diminish the process cost and to generate an alloy with homogenous microstructure and less casting *** hardness,X-ray diffraction,scanning electron microscopy and transmission electron microscopy were performed to determine the Mg influence on the AlZn *** efficiency was used to relate the influence of Mg with the thermal treatment on the corrosion behavior of the Al（Zn/xMg） *** results reveals the presence of Al 32（MgZn） 49 phase for two events;the first is when the Mg content is above 5.49% in as-cast condition,and the second after the thermal treatment is carried out at 450℃ for 5 *** results also show that the microhardness and electrochemical efficiency have been influenced by the presence of Al 32（MgZn） 49 *** addition of Mg modifies the microstructure,increases the content of Al 32（MgZn） 49 phase and improves the electrochemical efficiency.

关键词： Al(Zn/xMg) alloy Microhardness Electrochemical efficiency Microstructures