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Search Results: 1 - 10 of 6154 matches for " Leticia Medina-Esparza "
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Neospora caninum: Detección de ADN en sangre durante la primera gestación de vaquillas infectadas naturalmente
Omar Iván Santana,Carlos Cruz-Vázquez,Leticia Medina-Esparza,Miguel Ramos Parra
Veterinaria México , 2010,
Abstract: El objetivo del trabajo fue detectar la presencia de ADN de N. caninum en animales infectados naturalmente, en dos tiempos de su primera gestación y al parto, así como registrar la presentación de abortos. Se seleccionó, en un establo, con presencia de parasitosis, un lote de 20 hembras de entre 12 y 14 meses de edad, seropositivas en ELISA, las hembras fueron inseminadas artificialmente y se tomaron muestras de sangre en el primero y segundo tercios de gestación y al parto; se aisló ADN y se sometió a PCR anidado en un solo tubo con iniciadores específicos. En el muestreo correspondiente al primer tercio de la gestación, se observaron 7/20 casos positivos (35%), en el segundo 15/20 (75%) y al parto 10/20 casos positivos (50%). De los animales incluidos en el estudio, tres se mantuvieron negativos a la prueba en los tres muestreos (15%), cuatro fueron siempre positivos (20%), ocho fueron positivos en el segundo muestreo pero negativos en el primero (40%) y cinco fueron positivos en el segundo y negativos en el primero y tercero muestreos (25%). No se presentó seroconversión en ningún animal durante el estudio; cuatro de ellos presentaron aborto en el último tercio de gestación. Todas las crías nacidas vivas resultaron seropositivas a N. caninum.
Neospora caninum infection in beef cattle reared under grazing conditions in north-central Mexico
Karina Mondragón-Zavala,Carlos Cruz-Vázquez,Leticia Medina-Esparza,Miguel Ramos-Parra
Revista MVZ Córdoba , 2011,
Abstract: Objetive. To determine the seroprevalence of N. caninum antibodies and prevalence of parasite DNA in blood, and estimate the association between seroprevalence and the potential risk of some factors in beef cattle under grazing conditions in north-central Mexico. Materials and methods. Blood samples from 139 cows and only 10 bulls belonging to 13 farms were collected and evaluated by ELISA test to detect antibodies against N. caninum. Furthermore, to determine the presence of parasite DNA, nested PCR probe was performed on blood samples. Association between potential risk factors and seroprevalence was estimated. Results. Overall seroprevalence was 23% (35/149 samples), while the prevalence of parasite DNA in blood was 28% (42/149 samples). Of the 149 animals examined 28 (19%) were positive to both tests (25 cows and 3 bulls). Concordance between tests was k = 0.63. All herds had seropositive animals with positive parasite DNA detection in blood. The only risk factor identified was the presence of dogs (OR= 2.65). Conclusions. This study showed that bovine neospososis should be considered as an important infectious disease in north-central Mexico herds. Therefore, an epidemiological control should be taken into consideration to avoid the negative effect of this disease on mexican beef industry.
Neospora caninum infection in beef cattle reared under grazing conditions in north-central Mexico
Mondragón-Zavala,Karina; Cruz-Vázquez,Carlos; Medina-Esparza,Leticia; Ramos-Parra,Miguel; García-Vázquez,Zeferino;
Revista MVZ Córdoba , 2011,
Abstract: objetive. to determine the seroprevalence of n. caninum antibodies and prevalence of parasite dna in blood, and estimate the association between seroprevalence and the potential risk of some factors in beef cattle under grazing conditions in north-central mexico. materials and methods. blood samples from 139 cows and only 10 bulls belonging to 13 farms were collected and evaluated by elisa test to detect antibodies against n. caninum. furthermore, to determine the presence of parasite dna, nested pcr probe was performed on blood samples. association between potential risk factors and seroprevalence was estimated. results. overall seroprevalence was 23% (35/149 samples), while the prevalence of parasite dna in blood was 28% (42/149 samples). of the 149 animals examined 28 (19%) were positive to both tests (25 cows and 3 bulls). concordance between tests was k = 0.63. all herds had seropositive animals with positive parasite dna detection in blood. the only risk factor identified was the presence of dogs (or= 2.65). conclusions. this study showed that bovine neospososis should be considered as an important infectious disease in north-central mexico herds. therefore, an epidemiological control should be taken into consideration to avoid the negative effect of this disease on mexican beef industry.
Neospora caninum: Detección de ADN en sangre durante la primera gestación de vaquillas infectadas naturalmente
Santana, Omar Iván;Cruz-Vázquez, Carlos;Medina-Esparza, Leticia;Ramos Parra, Miguel;Castellanos Morales, Ciro;Quezada Gallardo, Daniel;
Veterinaria México , 2010,
Abstract: the aim of the study was to detect the dna presence of n. caninum in naturally infected animals, at two moments of their first gestation and at parturition, as well as to record the presentation of abortions. twenty females between 12 to 14 months of age, seropositive to elisa test, were selected from a dairy farm with presence of this parasitosis. the females were artificially inseminated and blood samples were taken in the first and second third of gestation and during parturition; dna was isolated and it was analyzed by a single tube nested pcr with specific primers. in the sampling corresponding to the first third of gestation, 7/20 positive cases were observed (35%), in the second 15/20 (75%) and during parturition 10/20 positive cases (50%). from the total of the animals included in this study, three stayed negative to the test in the three samplings (15%), four were always positive (20%), eight were positive in the second sampling but negative in first (40%) and five were positive in the second and negative in first and the third sampling (25%). all animals remained seropositive during the study; four aborted in the last third of gestation. all the live born calves were seropositive to n. caninum.
Seroprevalence of Neospora caninum Antibodies in Cattle in Veracruz, Mexico
D. Romero-Salas,Z. Garcia-Vazquez,F. Montiel-Palacios,T. Montiel-Pena,M. Aguilar-Dominguez,L. Medina-Esparza,C. Cruz-Vazquez
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2010.1445.1451
Abstract: The objective of this study was to determine the seroprevalence of Neospora caninum antibodies in 863 female cattle 1 to ≥6 years old from 78 herds of dairy, beef and crossbred cattle in Veracruz, Mexico. Serum samples were tested for the presence of N. caninum antibodies using an ELISA assay. Overall seroprevalence of N. caninum antibodies was 26%. By municipality, the highest prevalence was 47.4% and the lowest 6% (p<0.05). By age, the highest prevalence was found in 5 year olds (28%) and the lowest (11.1%) in 1 year olds (p<0.05). Regarding the breed, the highest seroprevalence was observed in crossbred females (p<0.05). Considering the reproductive status, the highest seroprevalence was in cows with >5 calvings (32.1%) and the lowest was in pubertal heifers (11.1%; p<0.05). Seroprevalence was 26.2% in homebred and 23% in purchased animals (p>0.05). Prevalence in females with a history of abortions was 40 and 26.2% in females with no records of previous abortions (p<0.05). The results show that bovine neosporosis is widespread in the State of Veracruz, Mexico, as in other regions of the country.
Factores de manejo asociados con la seroprevalencia a la infección por Neospora caninum, en ganado lechero de Aguascalientes, México
José de J. Gutiérrez González,Carlos Cruz Vázquez,Leticia Medina Esparza,Arturo Valdivia Flores
Veterinaria México , 2007,
Abstract: Con el objetivo de determinar la posible asociación entre algunos factores de manejo y la seroprevalencia a la infección por N. caninum en ganado lechero de Aguascalientes, México, se tomaron muestras de suero sanguíneo de 381 vacas Holstein distribuidas en 29 establos localizados en ocho de los once municipios de Aguascalientes. Las muestras fueron analizadas por la técnica de ELISA y se estimó la asociación entre la seroprevalencia y los antecedentes de aborto en las vacas, el origen de los reemplazos, la presencia de perros domiciliados en los establos y la disposición de fetos abortados, así como de desechos placentarios. La seroprevalencia a la infección por N. caninum fue de 57.5%, y en los diferentes municipios se observó una variación de 22% a 67%; la seroprevalencia en el grupo de vacas con antecedentes de aborto fue de 69%, mientras que en el grupo sin antecedentes de aborto fue de 48%; la razón de prevalencia fue de 1.4 (P < 0.001), ello sugiere una asociación entre el aborto y la seropositividad. La seroprevalencia de acuerdo con el origen de los reemplazos (propio o adquirido) fue de 57% y 58%, respectivamente; la presencia y ausencia de perros fue de 61% y 54%, respectivamente; por último, para los establos que tenían un programa de manejo de disposición de fetos abortados y desechos placentarios, la seroprevalencia fue de 61%, y 55%, para los que no lo tenían. Con ninguno de estos tres factores fue posible identifi car asociación con la seroprevalencia.
La telenovela en el mundo
Medina,Mercedes; Barrón,Leticia;
Palabra Clave , 2010,
Abstract: transnationalization and globalization of the latin american soap opera industry are examined in this article from an economic perspective, with a special emphasis on development of the industry in terms of production and distribution by the major exporters of this genre, and the industry's influence on the emergence of new producers in other parts of the world, such as the united states and europe
La telenovela en el mundo
Mercedes Medina,Leticia Barrón
Palabra Clave , 2010,
Abstract: Este artículo examina la transnacionalización y globalización de la industria de la telenovela latinoamericana desde una perspectiva económica, con una particular atención al desarrollo de esta industria relacionada con la producción y distribución de los principales exportadores de este género, y la influencia que ha tenido esta industria en el surgimiento de nuevos productores en otras partes del mundo, como Estados Unidos y Europa
Efecto de la densidad de plantación sobre el desarrollo y rendimiento del cultivo de la yuca Manihot esculenta Crantz, bajo las condiciones agroecológicas de la Altiplanicie de Maracaibo Planting density effect of the cassava (Manihot esculenta crantz) crop development and yielding under agroecological conditions of Maracaibo plain
R Rojas,W Gutiérrez,D Esparza,B Medina
Revista de la Facultad de Agronomía , 2007,
Abstract: Con la finalidad de evaluar el efecto de la densidad de plantación sobre el desarrollo y rendimiento de la yuca Manihot esculenta Crantz, bajo las condiciones agroecológicas de la Altiplanicie de Maracaibo, se realizó un ensayo en la Granja Experimental "Ana María Campos" de la Universidad del Zulia. Zona de vida caracterizada como bosque muy seco tropical, con precipitación de 400 600 mm.a o-1, temperatura media de 28oC suelos franco arenosos y pH de 5 a 6. Se evaluaron dos factores de estudio: 1. Distancia entre hileras (DEH): 1,5 m; 2,0 m, 2,5 m y 2. Distancia entre plantas (DEP): 0,8 m; 1,0 m y 1,2 m. El dise o estadístico utilizado fue un arreglo en parcelas divididas en bloques al azar con 5 repeticiones. El análisis de la varianza determinó efecto significativo (P<0,01) del factor de estudio DEH sobre las variables altura de planta, diámetro del tallo, ancho de copa, número de hojas, peso de raíces comerciales por planta y peso de raíces comerciales por hectárea. La DEP afecto significativamente (P<0,01) las variables ancho de copa, número de hojas, peso de raíces comerciales por planta y peso de raíces comerciales por hectárea. La DEH de 2,0 m y la DEP de 0,8 m permitió el mayor rendimiento de raíces comerciales por hectárea con 22.867 kg.ha-1 y 20.788 kg.ha-1, respectivamente. With the purpose of evaluating the planting density effect on the development and yielding of cassava Manihot esculenta Crantz crop, under agro ecological conditions of Maracaibo plain, an essay it was made in the Experimental Farm "Ana Maria Campos" of the University of Zulia. A life region considered as very dry tropical forest with a rainfall of 400 600 mm.year-1, an average temperature of 28°C, sandy loam soils and ph 5 - 6. Two study factors were evaluated: 1.Distance between rows (DBR): 1.5 m, 2 m, 2.5 m and 2. Distance between plants (DBP): 0.8 m, 1.0 m, and 1.2 m). The statistical analysis used was an arrangement in plots divided into blocks at random with five repetitions. Variance analysis determined a signifficative effect (P<0.01) of the study factor DBR on the plant height, stem diameter, canopy width, leaves number, weight of commercial roots per plant and weight of commercial roots per hectare. DBP affected in a signifficative way (P<0.01) the canopy width, the leaves number, plant and weight of commercial roots per hectare variables. DBR of 2 m, and DBP of 0.8 m, gave the major yielding of commercial roots per hectare with 22867 kg.ha-1 and 20788 kg.ha-1, respectively.
Adenoma del oído medio
Medina,Edwin Abraham; Arias,Viviana Leticia;
Biomédica , 2009,
Abstract: middle ear neoplasms are rare lesions and difficult to diagnose due to limited information about their biology and the lack of standard criteria for their analysis. herein, a middle ear neoplasm is described that became apparent because of its appearance in the external ear duct as it protruded from the middle ear through the eardrum. following resection, the specimen was determined to be a benign epithelial tumor. absence of adequate clinical information complicated the diagnosis; therefore,histochemistry and immunohistochemistry analyses were necessary to reach the final diagnosis of middle ear adenoma. diagnostic criteria are proposed to properly diagnose these types of lesions.
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