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Search Results: 1 - 10 of 586303 matches for " N;Valadez-Oma?a "
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Ethnobotanic study of Randia aculeata (Rubiaceae) in Jamapa, Veracruz, Mexico, and its anti-snake venom effects on mouse tissue
Gallardo-Casas, CA;Guevara-Balcázar, G;Morales-Ramos, E;Tadeo-Jiménez, Y;Gutiérrez-Flores, O;Jiménez-Sánchez, N;Valadez-Omaa, MT;Valenzuela-Vargas, MT;Castillo-Hernández, MC;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2012, DOI: 10.1590/S1678-91992012000300006
Abstract: in mexico, medicinal plants are widely used. the use of randia aculeata by healers against snakebites has never been scientifically tested in relation to possible effects on blood parameters and muscle tissue damage. interviews were carried out in jamapa, veracuz, mexico, with local residents to collect information about the traditional use of randia aculeata. in this locality, seven pieces of fruit from the plant are mixed in a liter of alcohol, and then administered orally against snakebites. by using histological techniques and a murine model, we explored its cytoprotective properties against the effects of crotalus simus and bothrops asper venoms. possible protections provided by the plant against tissue damage to skeletal and cardiac muscles and against the typical loss of red blood cells were analyzed. randia aculeata caused an increase in microhematocrit and total hemoglobin, parameters that are often decremented in association with the loss of red blood cells, which is a characteristic effect of animal venom. randia aculeata was also shown to protect against the lowering of platelet levels caused by bothrops asper venom. finally, randia aculeata produced a partial inhibition of necrosis following administration of snake venom in skeletal and myocardial muscles. the present results provide solid evidence for the traditional use of randia aculeata against snakebites, as demonstrated by protection against muscular tissue damage and the diminution of red blood cells.
The administration of Chlorella vulgaris protects against nefrotoxicity caused by CCl4
Valadez-Omaa María Teresa,Gutiérrez-Flores Octavio,Jiménez-Sánchez Nayelly,Romero-Valdéz Mayumi
RETEL : Revista de Toxicología en Línea , 2011,
Abstract: Chlorella vulgaris microalgae, is used as nourishment in aquaculture because of its high nutritional content. Recent researches had found anti-oxidative and cito-protective qualities in microalgae of this genus. The aim of this research was to study if cell damage in the kidney induced by intoxication with CCl4 which damages renal tissue, is prevented with the administration of this microalgae. For this, we used 32 male NIH mice, that were divided in 4 groups: a) Control, which received salt solution i.g + Corn-oil (i.p), b) Intoxicated with CCl4 (2.5 mL/Kg) i.p + s.s i.g, c) Chlorella vulgaris (1000 mg/Kg) i.g+ Corn-oil (i.p) and d) Chlorella vulgaris (1000 mg/Kg) i.g + CCl4 i.p. The kidneys were extracted, embeded in paraffin and stained by conventional method H-E. The lipoperoxidation, Catalase, γ-Glutamil transferase were also measured in kidney, and LDH activity in serum. The CCl4 produced glomeruloesclerosis, atrophy, loss of cell continuity and changes in the nuclei - cytoplasm relation in marrow and renal cortex, while Chlorella vulgaris reduced the mortality and kidney morphological damage and the per-oxidation, the increase of the LDH activity and also an increase of the γ-Glutamil transferase is promoted. With these results we conclude that this microalgae is a good citoprotector against CCl4 which causes renal damage.
Ciudadanía, espacio público y ciudad
María Concepción Martínez Omaa
Secuencia , 2011,
Abstract:
La zooarqueología dentro de la universidad nacional autónoma de méxico
Raúl Valadez Azúa,Gilberto Pérez Roldán
Antipoda. Revista de Antropología y Arqueología , 2011,
Abstract:
Fuentes de fuerza, diversidad tecnológica y rentabilidad de la producción de maíz en México
Artemio Cruz León,Tomás Martínez Salda?a,José Miguel Omaa Silvestre
Ciencia Ergo Sum , 2004,
Abstract: Para estudiar la rentabilidad media de la producción de maíz en México, se sintetizó la diversidad tecnológica de su producción según la fuente de fuerza usada en las diferentes prácticas agrícolas. Se eligieron cuatro formas representativas de producción de maíz: bajo roza tumba y quema (RTQ), con tracción animal, mixta (donde se usan animales y tractor), y con tractor. El agrupamiento de tecnología de acuerdo con el tipo de fuerza permitió abordar la intensidad del uso del suelo y de insumos y capital. Los resultados indicaron que los costos de producción fueron mayores cuando la fuente de fuerza fue el tractor, y disminuyeron progresivamente hasta alcanzar el mínimo en las tecnologías con RTQ. Esta situación no se refleja en la producción, ganancias y relación beneficio/costo, que presentan valores muy cercanos entre los cuatro grupos de tecnologías sin manifestar alguna tendencia.
Late Cretaceous (Maastrichtian) foraminiferal assemblage from the inoceramid beds, Ocozocoautla Formation, central Chiapas, SE Mexico
Omaa, Lourdes;
Revista mexicana de ciencias geológicas , 2006,
Abstract: foraminifera from samples collected in the lower part of the ocozocoautla formation were studied. this sequence crops out north-west of tuxtla gutiérrez in central part of chiapas state in south-eastern mexico. the lower part of the unit consists mostly of argillaceous and marly sandstone with inoceramids. this horizon yields a poorly preserved but biostratigraphically useful foraminiferal assemblage. the upper part of the gansserina gansseri zone is defined on the basis of the planktic foraminiferal association. an early maastrichtian age has been assigned, rather than late campanian-maastrichtian as previously determined in the literature. the environment was interpreted as outer shelf-upper slope with tethyan affinities, on the basis of the benthic and planktic foraminiferal association.
NEW EPIDEMIOLOGICAL AND CLINICAL DATA ON SCORPION ENVENOMATION IN THE CENTRAL NORTH REGION OF VENEZUELA
B. Omaa
Journal of Venomous Animals and Toxins , 1999, DOI: 10.1590/s0104-79301999000100021
Abstract:
Morphometry of Pedicle and Vertebral Body in a Mexican Population by CT and Fluroscopy
Urrutia Vega,Edgar; Elizondo Omaa,Rodrigo E; De la Garza Castro,Oscar; Guzmán López,Santos;
International Journal of Morphology , 2009, DOI: 10.4067/S0717-95022009000400052
Abstract: it is necessary to have precise anatomical knowledge of lumbar pedicles for the safe placement of screws. there are not reports about the morphometry of lumbar pedicles in a mexican population exist. a descriptive, observational and cross-sectional study was done in 60 cadavers from the dissection lab of the human anatomy department of the medicine school. the aim of the study was to quantify the morphometric characteristics of the pedicles of the lumbar spine in a mexican population. a total of 60 cadavers were evaluated by fluoroscopy and ct from l1 to l5, in the age range of 40 to 78 years. each vertebral pedicle was measured in the axial, sagittal and coronal planes. the measurements included the minimum pedicle width, the pedicle angle, the distance to anterior cortex, and anteroposterior and interpedicular spinal canal diameters. ct evaluation showed a progressive and gradual increase in the width of the pedicles from l1 (7.81 ±1.30 mm) to l5 (14.36 ±14.36 mm). a progressive and gradual decrease of pedicle length from l1 (20.92 ±2.62 mm) to l5 (17.23 ±1.35 mm). when fluoroscopy was used there was the same relationship, but the values were higher than those obtained by ct. the values for widths and lengths are slightly higher in males than in females, but do not reveal any significant difference (p<0.05). the data in this study indicates that pedicle screws (5.5-6.5mm) may be used in the lumbar region.
Morphometry of Pedicle and Vertebral Body in a Mexican Population by CT and Fluroscopy Morfometría del Cuerpo Vertebral y Pedículo en una Población Mexicana Mediante TC y Fluoroscopía
Edgar Urrutia Vega,Rodrigo E Elizondo Omaa,Oscar De la Garza Castro,Santos Guzmán López
International Journal of Morphology , 2009,
Abstract: It is necessary to have precise anatomical knowledge of lumbar pedicles for the safe placement of screws. There are not reports about the morphometry of lumbar pedicles in a Mexican population exist. A descriptive, observational and cross-sectional study was done in 60 cadavers from the dissection lab of the Human Anatomy Department of the Medicine School. The aim of the study was to quantify the morphometric characteristics of the pedicles of the lumbar spine in a Mexican population. A total of 60 cadavers were evaluated by fluoroscopy and CT from L1 to L5, in the age range of 40 to 78 years. Each vertebral pedicle was measured in the axial, sagittal and coronal planes. The measurements included the minimum pedicle width, the pedicle angle, the distance to anterior cortex, and anteroposterior and interpedicular spinal canal diameters. CT evaluation showed a progressive and gradual increase in the width of the pedicles from L1 (7.81 ±1.30 mm) to L5 (14.36 ±14.36 mm). A progressive and gradual decrease of pedicle length from L1 (20.92 ±2.62 mm) to L5 (17.23 ±1.35 mm). When fluoroscopy was used there was the same relationship, but the values were higher than those obtained by CT. The values for widths and lengths are slightly higher in males than in females, but do not reveal any significant difference (p<0.05). The data in this study indicates that pedicle screws (5.5-6.5mm) may be used in the lumbar region. Es necesario tener un conocimiento anatómico preciso de la morfología de los pedículos en la region lumbar para la colocación segura de tornillos intrapediculares. No existen reportes de la morfometría de los pedículos lumbares en la población Mexicana. Se desarrolló un estudio descriptivo, observacional y transversal en 60 cadaveres en el laboratorio del Departamento de Anatomía Humana de la Facultad de Medicina. El objetivo del estudio fue determinr las características morfométricas de los pedículos de la region lumbar en una muestra de población Mexicana. Se evaluaron las regiones lumbares (L1-L5) de un total de 60 cadaveres por fluroscopía y TC en un rango de edad entre 40 y 78 a os. Cada pedículo fue medido en los planos axial, sagital y coronal. La evaluacion por TC muestra un aumento progresivo y gradual de la anchura de los pedículos de L1 (7,81 ±1,30 mm) a L5 (14,36 ±14,36 mm). También se observó una disminución gradul de la longitud del pedículo de L1 (14,36 ±14,36 mm) a L5 (17,23 ±1,35 mm). Al realizar las mediciones por fluroscopia se observaron las mismas condiciones, pero los valores fueron proporcionalmente mayores que los obtenidos po
Caracterización de ADN de clones de papa e identificación de fitoplasmas asociados al síndrome de la punta morada
Alarcón-Rodríguez, Norma M.;Lozoya-Salda?a, Héctor;Valadez-Moctezuma, Ernestina;
Agrociencia , 2009,
Abstract: in many potato growing areas in méxico, there is presence of purple top syndrome, which reduces the yield and quality of this tuber. a main factor of this syndrome is the presence of phytoplasms and inadequate management of its insect vector. one option for controlling this disease is to generate resistant potato genotypes and early diagnosis to prevent its disemination. therefore, the objectives of the present study were to detect phytoplasms associated with purple top present in asymptomatic potato clones, but which were exposed to the disease for four seasons, and to identify the host-pathogen relationship. at the end of the 2005 growing season, leaves of 18 asymptomatic potato clones, in toluca, state of méxico, were collected, originating from two breeding programs of the united states department of agriculture (usda/ars). also included were the alpha cultivar with symptoms of the disease as positive control and plants free of phytoplasm. the detection of the pathogen was made with direct pcr, nested pcr and rflp markers, using the enzymes alu 1, hinf 1, kpn 1, eco r1, tru 9, taq 1, and identifying the presence of three groups of phytoplasm in all of the clones. the clones were clustered in three groups related to the positive control, using five primers of rapds markers. a limited specific host-pathogen relationship was detected as a function of the dna fingerprints of both host and pathogen.
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