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Search Results: 1 - 10 of 271662 matches for " H. Reyes-Vázquez "
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Melatonin Avoids Anatomofunctional Changes Associated to Aging in a Rat Model  [PDF]
Bertha Prieto Gómez, Cruz Reyes-Vázquez, Mireya Velázquez-Paniagua
Advances in Aging Research (AAR) , 2014, DOI: 10.4236/aar.2014.34041
Abstract: Melatonin is a hormone synthesized and released primarily by the pineal gland. Its secretion fol-lows a circadian rhythm with a peak overnight. Its secretion is initiated approximately to the three months of age and continues to rise during the childhood. Previous to the puberty there is a de-crease of melatonin secretion that continues until the old age. Melatonin has effects in the body and acts through at least four mechanisms: membrane receptors, orphan nuclear receptors, calmodulin and free radicals. It has been suggested that aging can be a consequence of the oxidation of cells that eventually become vulnerable to injury and die. This work reviews the antioxidant effects of melatonin in a rodent model, on the formation of free radicals, on the MAP2 protein expression and on the electrophysiology of the hippocampus at different ages. The results indicate that melatonin maintains in a “best” state to the experimental animals compared to controls. It suggests the use of melatonin as a therapy to prevent or delay the aging effects on the cells.
Breastfeeding Recommendations. Pediatricians Mexicans Survey  [PDF]
H. Reyes-Vázquez, C. Lopez-Enriquez, F. Bribiesca-Godoy, A. Espinosa-Aguilera, B. M. Morfin-Maciel, N. E. Martínez-Aguilar
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1102816
Objective: To know recommendations on breastfeeding by Mexican pedia-tricians. Methods: Cross-sectional, descriptive study conducted through a survey of Mexican pediatricians. Results: Two hundred and fifty-four pedi-atricians (range 27 to 72 years) were surveyed. Most of them worked in public hospital or private practice or both. Among them 94.5% recom-mended newborn early contact with mother and 54.3% rooming. Exclusive breastfeeding was suggested by 89.8%, out of them 51.9% for 6 months. Breastfeeding on demand was counseled by 88.2% and 84.6% without fixed schedules. Pacifier use was rejected by 86.6%. 51.2% used iron supplements and 59.5% used other vitamins. Stopping breastfeeding in special situations was suggested by 87.4%; of them, 86.6% in case of infection with AIDS; 74.4% if the mother used drugs; 74.4% by infection with hepatitis B virus; 49.6% in case of mastitis; 17.3% in newborns with jaundice; and 18.5% in other situations. Finally, 93.3% of pediatricians surveyed reported interest in breastfeeding; 54.7% obtained information in medical journals; 54.7% through medical courses, and 31.9% in books. 58.3% of respondents oriented on breastfeeding according to WHO recommendations; 31.5% did so regularly and 10.2% did not. Conclusions: Pediatricians play a major role in breastfeeding promotion, but their formation is scarce and they are not prepared to counsel patients. Governments of developing countries should promote breastfeeding to ensure the health and proper development of infants.
Melatonin changes the electrical spontaneous activity of hippocampal rat neurons at different ages  [PDF]
Daniel Perez-Torres, Cruz Reyes-Vázquez, Mireya Velázquez-Paniagua, Bertha P rieto-Gómez
Advances in Aging Research (AAR) , 2014, DOI: 10.4236/aar.2014.31006

Melatonin, the pineal indole is characterized by being a compound that crosses all cell membranes and which has been attributed to several mechanisms of action. Among these it is the ability to reduce free radicals, thereby reducing the potential aging and cell death. Studies in different age Wistar rats have shown that chronic application of melatonin, in the hippocampus, reduces the concentration of free radicals and keeps its architecture. This study showed that melatonin increases the firing rate and favors the presence of bursting activity in animals of different ages. It is suggested that melatonin conserved hippocampal cells in good anatomical and physiological condition probably as a result of the elimination of free radicals.

Bulk anisotropic excitons in type-II semiconductors built with 1D and 2D low-dimensional structures
H. A. Coyotécatl,M. del Castillo-Mussot,J. A. Reyes,G. J. Vázquez
Revista mexicana de física , 2005,
Abstract: Utilizamos un método variacional para tomar en cuenta la diferencia entre las masas efectivas del electrón y del hueco en excitonesWannier- Mott en heteroestructuras semiconductoras tipo II en las que el electrón está constre ido en un alambre cuántico unidimensional (AC1D) y el hueco en un pozo cuántico bidimensional (PC2D) perpendicular al alambre o viceversa. La ecuación de Schr dinger resultante es similar a la de un excitón en el bulto en 3D porque el número de variables libres (no confinadas) es tres; dos que provienen del PC2D y una del AC1D. En este sistema interacción efectiva electrón-hueco depende de los potenciales de confinamiento.
Tree Species Composition in Tropical Forest Remnants of Highly Deforested Regions: The Case of the Huasteca Potosina Region, Mexico  [PDF]
Humberto Reyes, Blanca M. Vázquez, Carmen Jasso, Miguel Aguilar
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.516086
Abstract: Deforestation and fragmentation of tropical forest are the most serious threats to biodiversity. In the lowlands of the Huasteca Potosina region, Mexico, more than 95,000 ha of tropical forest have disappeared. This paper analyses tree species composition in tropical forest patches of this highly deforested region, located in northeast of Mexico. At present, only 57 remnants of arboreal vegetation larger than ten hectares still remain standing, which cover 6117 ha. These decreasing fragments host 140 floristic species, representing 42 families and 85 genera. Compared with previous inventories, these data show a sharp drop in species composition. Most of the forest remnants contain less than 50% of the floristic diversity recorded by previous surveys, particularly in the medium subperennial tropical forest.
Modified HPMs Inspired by Homotopy Continuation Methods
Héctor Vázquez-Leal,Uriel Filobello-Ni o,Roberto Casta eda-Sheissa,Luis Hernández-Martínez,Arturo Sarmiento-Reyes
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/309123
Abstract: Nonlinear differential equations have applications in the modelling area for a broad variety of phenomena and physical processes; having applications for all areas in science and engineering. At the present time, the homotopy perturbation method (HPM) is amply used to solve in an approximate or exact manner such nonlinear differential equations. This method has found wide acceptance for its versatility and ease of use. The origin of the HPM is found in the coupling of homotopy methods with perturbation methods. Homotopy methods are a well established research area with applications, in particular, an applied branch of such methods are the homotopy continuation methods, which are employed on the numerical solution of nonlinear algebraic equation systems. Therefore, this paper presents two modified versions of standard HPM method inspired in homotopy continuation methods. Both modified HPMs deal with nonlinearities distribution of the nonlinear differential equation. Besides, we will use a calcium-induced calcium released mechanism model as study case to test the proposed techniques. Finally, results will be discussed and possible research lines will be proposed using this work as a starting point.
Géneros fúngicos aislados de pacientes con rinitis alérgica y su relación con la prueba de hipersensibilidad subcutánea de Prick
Rodríguez Orozco, Alain R.;Vargas Villegas, Elvia;Tafolla Mu?oz, Liliana;Ruiz Reyes, Héctor;Hernández Chávez, Liliam A.;Vázquez Garcidue?as, Soledad;
Revista mexicana de micología , 2008,
Abstract: skin prick test was applied to 108 patients with allergic rhinitis from the hospital vasco of quiroga, issste, placed in morelia, michoacan. for the isolation of strains on pda, nasal and pharyngeal swabs were obtained from patients had a positive skin prick tests for allergenic fungi, being the specimens identified by morphological methods and using a biotypification system (biolog). the frequencies of positive skin prick test to allergic fungi genera were the following: candida 65.7%, aspergillus 15.7%, cladosporium 13.89%, alternaria 10.2%, rhizopus 9.3%, helminthosporium 6.5%, penicillium 5.6% and mucor 4.6%. statistical correlation between the results of the different methods was not significant (p> 0,05), due to several fungal genera identified did not induce detectable hypersensitivity reactions in the subcutaneous test, and the allergenicity of some fungi detected by biolog system is not known. it is required to continue studying the relation between apparently non allergenic fungi with the atopic host and his pathogenic microbiota.
Solvent-Free Synthesis of Carboxylic Acids and Amide Analogs of CAPE (Caffeic Acid Phenethyl Ester) under Infrared Irradiation Conditions  [PDF]
Pablo A. Martínez-Soriano, José R. Macías-Pérez, Ana María Velázquez, Brígida del Carmen Camacho-Enriquez, Gustavo Pretelín-Castillo, Mónica B. Ruiz-Sánchez, Víctor H. Abrego-Reyes, Saúl Villa-Trevi?o, Enrique Angeles
Green and Sustainable Chemistry (GSC) , 2015, DOI: 10.4236/gsc.2015.52011
Abstract: A convenient and easy method is described for the formation of carboxamides from carboxylic acids and primary amines in solventless conditions using infrared (IR) light. Thus, under IR light, cinnamic acid derivatives and amines can produce yields ranging from 50% to 85% of the resulting amide.
Control sociocultural, reivindicaciones étnicas y movilización entre los tobas-qom asentados en el barrio Los Pumitas. Rosario. Argentina
Papeles de trabajo - Centro de Estudios Interdisciplinarios en Etnoling???-stica y Antropolog?-a Socio-Cultural , 2007,
Abstract: from a critical historical view the author reflects on the sociocultural control process among the tobas- qom- settled at los pumitas (rosario city, argentina).
Procesos identitarios, “minorías” étnicas y etnicidad: los mapuches de la República Argentina
Héctor Vázquez
Amnis , 2002, DOI: 10.4000/amnis.167
Abstract: En prenant l’exemple des Mapuches d’Argentine, l’auteur de l’article établit une réflexion sur certains concepts clés de l’anthropologie socioculturelle contemporaine tels que: processus identitaires, ethnie, ethnicité, minorités ethniques, résistance ethnique, autonomie et autodétermination. In this paper the author considers several key concepts concerning socio-cultural anthropology such as the identity process, ethnic minorities, autonomy and self-determination. The author focuses on the Argentine Mapuches. El autor establece una reflexión crítica sobre algunos conceptos claves de la antropología sociocultural contemporánea tales como: procesos identitarios, etnia, etnicidad, minorías étnicas, resistencia étnica, autonomía y autodeterminación. Encarnándolos en un caso concreto: Los Mapuches de la Argentina.
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