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Search Results: 1 - 10 of 224454 matches for " de Salazar y Acha "
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Relación de las publicaciones periódicas de los Centros que integran la CECEL
de Salazar y Acha, Eduardo
Arbor : Ciencia, Pensamiento y Cultura , 2008, DOI: 10.3989/arbor.2008.ia1.305
Abstract: A list of magazines published by the centres of the CECEL arranged according to Autonomous Communities and Provinces. Data related to their ISSNs, their periodicity or the dates of the launching of each magazine are given too. Se relacionan las revistas editadas por los Centros de la CECEL ordenadas por autonomías y provincias. Se suministran los datos de sus ISSN’s, Periodicidad y fecha de inicio de cada publicación.
Estado de conservación de los peces de la familia Goodeidae (Cyprinodontiformes) en la mesa central de México
De la Vega-Salazar,Marina Y;
Revista de Biología Tropical , 2006,
Abstract: conservation status of goodeidae familiy fishes (cyprinodontiformes) from the mexican central plateau. to establish the conservation status and threats for goodeidae fishes in the high plateau of mexico, i assessed limnological descriptions,and the reduction in range and in number of localities where they are found, in 53 localities (58.8% of historically reported localities). this assessment included the comparison of current collections with historical records. a principal component analysis of limnological variables showed that most remnant goodeid species inhabit localities characterised by low environmental degradation: few appear to have a high tolerance to environmental degradation. overall, 65% of species suffered a reduction in number of localities where they are found. almost all species face some conservation threat,considering the criteria and categories established by the international union for the conservation of nature (iucn). data suggest that one species is extinct (allotoca catarinae), one more is extinct in the wild (skiffia francesae), eight are critically endangered (allodontichthys hubbsi, allotoca goslinei, allotoca regalis, allotoca zacapuensi, ameca splendens, characodon audax,hubbsina turneri,and zoogoneticus tequila), eleven are endangered, eight can be regarded as vulnerable, four are "near threatened" and only two appear to under "least concern". habitat loss, introduction of exotic fish, and being species with restricted physiographic range or ecologically specialised, are the main factors leading to the threat of extinction of the goodeidae family. recovery actions are needed for the conservation of this fish group. rev. biol.trop. 54(1): 163-177. epub 2006 mar 31.
Estado de conservación de los peces de la familia Goodeidae (Cyprinodontiformes) en la mesa central de México
Marina Y De la Vega-Salazar
Revista de Biología Tropical , 2006,
Abstract: Se estableció el estado de conservación y se identificaron los riesgos que presentan los peces de la familia Goodeidae en la Mesa Central de México. Para ello se evaluó la disminución en el número de localidades y el área de distribución, y se incorporó una descripción limnológica en 53 localidades. Esta evaluación incluyó una comparación de las colecciones actuales con registros históricos de la distribución de la familia. Un análisis de componentes principales de las variables limnológicas indicó que la mayoría de las especies de goodeidos habitan localidades caracterizadas por tener poca degradación ambiental, y sólo pocas especies parecen tener elevada tolerancia a dicho estado de contaminación. Los resultados de la disminución histórica de localidades y del área de distribución sugieren que el estado de conservación de las especies (de acuerdo con los criterios de la IUCN) es el siguiente: una especie está extinta (Allotoca catarinae), una especie está extinta en la naturaleza (Skiffia francesae, ya que existen ejemplares en cautiverio, ocho están en peligro crítico (Allotoca goslinei, Allotoca regalis, Allotoca zacapuensis, Allodontichthys hubbsi, Ameca splendens, Characodon audax, Hubbsina turneri y Zoogoneticus tequila, once están en peligro, ocho se consideran como vulnerables, cuatro se pueden considerar en riesgo próximo y sólo dos parecen no enfrentar ningún riesgo. En conclusión, la pérdida de hábitat, la introducción de especies exóticas de peces, el ámbito geográfico restringido y la especialización ecológica de las especies son los principales factores de riesgo para las especies estudiadas de la familia Goodeidae. La supervivencia de este grupo requiere acciones para su conservación. Conservation status of Goodeidae familiy fishes (Cyprinodontiformes) from the Mexican Central Plateau. To establish the conservation status and threats for Goodeidae fishes in the high plateau of Mexico, I assessed limnological descriptions,and the reduction in range and in number of localities where they are found, in 53 localities (58.8% of historically reported localities). This assessment included the comparison of current collections with historical records. A principal component analysis of limnological variables showed that most remnant Goodeid species inhabit localities characterised by low environmental degradation: few appear to have a high tolerance to environmental degradation. Overall, 65% of species suffered a reduction in number of localities where they are found. Almost all species face some conservation threat,considering the criteria and c
Enfoques del trasplante pancreático y de Islotes de Lanngerhans en el tratamiento de la Diabetes
Rafael De Acha Torrez
Revista Científica Ciencia Médica , 2011,
Abstract: La diabetes es una enfermedad con gran repercusión a nivel mundial, los objetivos de una terapia prolongada, en pacientes con cierta limitación en la terapia exógena convencional son mejorar la calidad de vida con niveles normoglicemicossustentables. Los trasplantes de órgano o de islotes son alternativas promisorias para este fin. Por lo que el enfoque de las técnicas, historia y perspectivas a futuro es de gran interés dentro de múltiples campos como la cirugía, la endocrinología, la medicina interna, finalmente y más importante la vida del paciente.
Hematocrit and mean arterial blood pressure in pre- and postmenopause women
Beatriz Y Salazar Vázquez, Miguel A Salazar Vázquez, Marcos Intaglietta, Ulf de Faire, et al.
Vascular Health and Risk Management , 2009, DOI: http://dx.doi.org/10.2147/VHRM.S5798
Abstract: tocrit and mean arterial blood pressure in pre- and postmenopause women Original Research (5390) Total Article Views Authors: Beatriz Y Salazar Vázquez, Miguel A Salazar Vázquez, Marcos Intaglietta, Ulf de Faire, et al. Published Date May 2009 Volume 2009:5 Pages 483 - 488 DOI: http://dx.doi.org/10.2147/VHRM.S5798 Beatriz Y Salazar Vázquez1,2, Miguel A Salazar Vázquez3,4, Marcos Intaglietta2, Ulf de Faire5, Bengt Fagrell6, Pedro Cabrales2 1Facultad de Medicina, 3Department of Physical Chemistry, Universidad Juárez del estado de Durango, Durango, México; 2Department of Bioengineering, University of California, San Diego, La Jolla, CA, USA; 4Department of Pediatrics, Instituto Mexicano del Seguro Social, Durango, México; 5Division of Cardiovascular Epidemiology, Institute of Environmental Medicine, Department of Cardiology, Karolinska Institutet, Solna, Stockholm, Sweden; 6Department of Medicine, Karolinska Institutet at Karolinska Hospital, Solna, Stockholm, Sweden Abstract: The relationship between mean arterial blood pressure (MAP) and hematocrit (Hct) was studied in pre- and postmenopause women in the city of Durango, Mexico. Premenopause women show a negative trend between parameters that is not statistically significant. MAP and Hct are directly related in postmenopause women (p < 0.01). It is proposed that that this MAP/Hct relationship is in part due to differences in endothelial function where menopause decreases the capacity of the endothelium to respond to increased blood viscosity and shears stress, leading to the increased production of vasodilator mediators to compensate for changes in blood viscosity due to changes in Hct. Comparison with a large group of postmenopause women in the city of Stockholm showed identical trends.
Hematocrit and mean arterial blood pressure in pre- and postmenopause women
Beatriz Y Salazar Vázquez,Miguel A Salazar Vázquez,Marcos Intaglietta,Ulf de Faire
Vascular Health and Risk Management , 2009,
Abstract: Beatriz Y Salazar Vázquez1,2, Miguel A Salazar Vázquez3,4, Marcos Intaglietta2, Ulf de Faire5, Bengt Fagrell6, Pedro Cabrales21Facultad de Medicina, 3Department of Physical Chemistry, Universidad Juárez del estado de Durango, Durango, México; 2Department of Bioengineering, University of California, San Diego, La Jolla, CA, USA; 4Department of Pediatrics, Instituto Mexicano del Seguro Social, Durango, México; 5Division of Cardiovascular Epidemiology, Institute of Environmental Medicine, Department of Cardiology, Karolinska Institutet, Solna, Stockholm, Sweden; 6Department of Medicine, Karolinska Institutet at Karolinska Hospital, Solna, Stockholm, SwedenAbstract: The relationship between mean arterial blood pressure (MAP) and hematocrit (Hct) was studied in pre- and postmenopause women in the city of Durango, Mexico. Premenopause women show a negative trend between parameters that is not statistically significant. MAP and Hct are directly related in postmenopause women (p < 0.01). It is proposed that that this MAP/Hct relationship is in part due to differences in endothelial function where menopause decreases the capacity of the endothelium to respond to increased blood viscosity and shears stress, leading to the increased production of vasodilator mediators to compensate for changes in blood viscosity due to changes in Hct. Comparison with a large group of postmenopause women in the city of Stockholm showed identical trends.Keywords: menopause, endothelial dysfunction, blood viscosity, blood pressure, hematocrit
Study of the Phase Diagram and the Tc Pressure Dependence for HgBaCuO Superconductors
E. V. L. de Mello,C. Acha
Physics , 1997, DOI: 10.1016/S0921-4534(97)01035-6
Abstract: We apply a method recently derived based on the extended Hubbard Hamiltonian and the BCS approach to obtain the superconducting critical temperature dependence with carrier density for the HgBaCuO compounds. We show that this procedure can be used to study pressure effect with the assumption that pressure changes the supercondutor gap. The results reproduce well the experimental data for the whole doping regime and the high and low pressure dependence.
The extended Hubbard model applied to study the pressure effects for High Temperature Superconductors
E. V. L. de Mello,C. Acha
Physics , 1997, DOI: 10.1103/PhysRevB.56.466
Abstract: We make use of a BCS type approach based on the extended Hubbard Hamiltonian to study the superconductor transition and to give a microscopic interpre- tation of the pressure effects on Tc in high temperature superconductors. This novel method suggests that the applied pressure causes an increase of the superconducting gap and this effect is explored in order to explain the variations of Tc. Our approach is therefore beyond the scope of previously phenomenological models which basically postulate a pressure-induced charge transfer and an intrinsic term linear on the pressure. We obtain a microscopic interpretation of this intrinsic term and a general expansion of Tc in terms of the pressure. To demonstrate the efficiency of the method we apply it to the experimental data of the Hg-base superconductors.
Proceso de internacionalización de servicios: Un estudio en una cadena de restaurantes del nordeste brasile?o
Santos Salazar,Viviane; Araújo de Moraes,Walter Fernando; Pereira Leite,Yákara Vasconcelos;
Estudios y perspectivas en turismo , 2012,
Abstract: the restaurants have an important role in tourist destinations. the development of appropriate business strategies can support the delivery of appropriate services to consumers and expansion. this paper is a theoretical and empirical research in order to analyze the process of internationalization of the bonaparte group. in the theoretical framework identifies the main concepts related to the internationalization of enterprises, the service features and how they impact the process of international expansion. the methodology used was qualitative case study as the unit of analysis was the brand of the brazilian group bossa grill bonaparte. the results show that the main reason was to expand the search for new markets and for this, we developed a totally different product that the company was already operating in brazil. the choice by the united states was due to maturity and size of the market for food away from home, beyond the political and economic stability that allows for greater planning firms. it is also evident that the social networks of executives were instrumental in the early development and internationalization of the supply chain, seeking partners in brazil and the united states for the design of society. as input mode, the company chose the franchise system. it is noticed that despite their idiosyncrasies the process of internationalization of the group does not differ from bonaparte conducted by manufacturing companies.
Ri?ón en herradura asociado a poliquistosis renal
Rodríguez Palomo,David; de la Paz García,Yéssica; Salazar Villanea,Roberto;
Medicina Legal de Costa Rica , 2010,
Abstract: this work describes the anatomic variation from an incidental case of dissection found at universidad de ciencias medicas, which presents horseshoe kidney with a right arteriovenous variant which consists of five renal arteries and four renal veins, related to polycystic kidney.
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