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Search Results: 1 - 10 of 155176 matches for " Hugo H; Ulloa-Arvizu "
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Genetic polymorphism of the αs1-casein locus in five populations of goats from Mexico
Torres-Vázquez,José Antonio; Vázquez Flores,Felícitas; Montaldo,Hugo H; Ulloa-Arvizu,Raúl; Valencia Posadas,Mauricio; Gayosso Vázquez,Amanda; Alonso Morales,Rogelio Alejandro;
Electronic Journal of Biotechnology , 2008,
Abstract: with the objective of estimating allele frequencies, and testing for population divergence for the csn1s1 locus, genotypes of animals from five goat populations; saanen (n = 97), alpine (n = 81) toggenburg (n = 92), local goats with external appearance similar to the murciana-granadina breed from central mexico (n = 26) and heterogeneous local animals denominated mosaico lagunero (n = 30), from northern mexico, were identified using pcr and xmn1 pcr-rflp methodology. for saanen, alpine and toggenburg, the sum of e and f alleles had the largest frequencies (from 0.468 to 0.789), while for the groups local murciana-granadina and mosaico lagunero the sum of the most frequent allelic groups (a* and b*), were 0.385 and 0.533 respectively. both local murciana-granadina and mosaico lagunero populations showed heterozygote excess (p < 0.08). the percentage of the total genetic variation (fst) explained by population differences was 5.16. there was genetic differentiation for most pair comparisons between populations (p < 0.05), excepting for alpine versus toggenburg, and toggenburg versus mosaico lagunero (p > 0.05). for saanen and alpine the frequencies of alleles e and f were similar to the same breeds previously analyzed in europe. therefore there are opportunities of increasing the frequency of the strong alleles for protein content gene assisted selection (gas) in these two breeds. for toggenburg the most frequent allelic groups were f (0.32) and b* (0.21). results indicate differentiation between most populations for this locus. moreover, heterozygote excess in local populations indicated breed admixture.
Caracterización de la curva de crecimiento en dos especies de pez blanco Chirostoma estor, C. promelas y sus híbridos
Ana Carmen Delgadillo-Calvillo,Carlos Antonio Martínez-Palacios,José Manuel Berruecos-Villalobos,Raúl Ulloa-Arvizu
Veterinaria México , 2012,
Abstract: El objetivo del presente estudio fue estimar parámetros de las curvas de crecimiento del peso y la longitud en el pez blanco Chirostoma estor (EE), el pez blanco pico negro Chirostoma promelas (PP) y de sus híbridos recíprocos (EP y PE) hasta los 300 días de edad a partir de un cruzamiento dialélico completo bajo condiciones de cultivo en Morelia, Michoacán, México. La longitud se midió mensualmente desde la eclosión, mientras que el peso se midió mensualmente a partir de los 120 días. Los números totales de observaciones (muestras) analizadas para longitud fueron 1006 (26), 771 (22), 513 (22) y 421 (21) para los grupos EP, PE, PP y EE, respectivamente. Los números totales de observaciones (muestras) analizadas para peso fueron 630 (16), 521 (14), 263 (13) y 256 (13) para los grupos EP, PE, PP y EE, respectivamente. Las curvas de crecimiento para peso y longitud se estimaron con modelos de regresión no lineal. El grupo EE alcanzó un peso estimado de 7.89 g a los 300 días de edad, 65% mayor que el de PP (4.78 g) y 57% mayor que el promedio de los híbridos (P < 0.01); EE tuvo una longitud de 9.31 cm (14%) mayor que PP (7.97 cm) y 13% mayor que la del promedio de los híbridos (P < 0.01). Los cuatro grupos, mostraron un crecimiento de tipo alométrico positivo con valores de 3.2 a 3.3 (P < 0.05). Los resultados de este estudio son las primeras estimaciones comparativas de las características de crecimiento hasta los 300 días de edad para estas especies y sus híbridos en cautiverio.
Efecto del zeranol sobre la maduración de piel en chinchilla lanígera (Eryomis laniger)
Ignacio Albano Badillo Briones,René Fernández Román,Raúl Ulloa Arvizu
Veterinaria México , 1999,
Abstract: Con el objeto de evaluar el efecto de la lactona del ácido resorcílico (zeranol) sobre la maduración de la piel de chinchilla, se realizó un experimento en un dise o completamente al azar por grupo de edad y sexo. El estudio duró 4 meses en la época de verano-oto o (junio-septiembre). Se incluyeron 33 hembras vírgenes de 12 a 24 meses de edad, 60 machos de 12 a 18 meses; y 29 hembras en producción de 24 a 48 meses de edad; a la mitad de los animales se les implantó subcutáneamente 12 mg de zeranol. La evaluación visual se hizo cada 2 semanas y se obtuvieron las pieles cuando las 3 franjas del color del pelo presentaban el mismo nivel en toda la superficie del cuerpo, momento en el cual se considera como piel madura. Se realizó un análisis de sobrevida mediante el método de Log Rank ajustado por grupos, en el cual se encontró un efecto anagénico significativo (P<0.01) del zeranol. El porcentaje de maduración en los animales implantados fue 84%, 94% y 50% en los machos, hembras jóvenes y hembras adultas, respectivamente; mientras que para los no tratados la maduración fue de 20%, 38% y 13.3%, para los mismos grupos. Se hicieron dos análisis de Log Rank ajustado por grupos de tratamiento, los cuales mostraron un efecto de edad y sexo; en ambos casos las hembras jóvenes presentaron un mayor porcentaje de maduración que las hembras adultas y que los machos (P < 0.01).
Large Wood Volume and Longitudinal Distribution in Channel Segments Draining Catchments with Different Land Use, Chile  [PDF]
A. Iroumé, L. Mao, H. Ulloa, C. Ruz, A. Andreoli
Open Journal of Modern Hydrology (OJMH) , 2014, DOI: 10.4236/ojmh.2014.42005
Abstract:
The storage, longitudinal distribution and recruitment processes of in-stream large wood (LW) were studied comparing channel segments draining four Chilean mountain catchments with different land use. The segments were divided into relatively uniform reaches of different lengths and surveyed for LW (piece dimensions, position in the channel, orientation to flow and aggregation) and stream morphology (slope and bank full channel width and depth) characterizations. LW volume stored in the Pichun, El Toro and Vuelta de Zorra study channels are within the range informed in international researches from streams draining catchments with similar forest covers. However, the 1057 m3/ha of LW stored in Tres Arroyos is extremely high and in the same order of magnitude than the reports from old-growth forests in the Pacific Northwest of USA. The size of the area that can potentially provide wood to streams depends on the wood supply mechanisms within any catchment, and the LW stored in the study segments increases as the size of this area increases. This study aims to contribute to the knowledge on the effects of LW in mountain channels, gathering new information and expanding investigations developed in Chile since 2008. This research was carried out within the framework of Project FONDECYT 11106209.
Brotes epizoóticos de triquinosis en dos criadores de cerdos de la Región Metropolitana, Chile. Epizootic outbreaks of trichinosis in two pig farms from the Metropolitan Region, Chile.
Hugo Schenone,Marisol Burgos,Marcelo Ulloa,Pedro Acu?a
Boletín chileno de parasitología , 1999,
Abstract: In Chile swine trichinosis has presented a progressive decreasing in the last two decades of XX century. T. Spiralis pig infection descended from an average of 0.683 per 1000 in 1980-1984 to 0.315 in 1985-1989 andto 0.115 in 1990-1996. In the particular case of Metropolitan Region this decreasing has been more marked: from an average of 0.058 per 1000 in 1990-1994to 0.003 in 1995-1999. Between the end of June 1999 and middle January 2000 in MetropolitanRegion abattoirs T. spiralis was detected in 15 (4.9%) out of 306 swine from two pigsties located in El Monte (E.M.) and Padre Hurtado (P.H.) 45 and 30 km south-west from Santiago. In the same period another four pigs from the same premises were found infected in abattoirs of other regions. During inspection visits it was stated that both pig farms had deficient sanitary conditions. Phototrichinoscopy was positive in three out of five Rattus norvegicus collected in E.M. In pigsty PH the examination of diaphragm samples of 25 dogs and 17 cats resulted negative. In the premises originating T. spirali infected swine the Metropolitan Environmetal Health Service Abattoirs Progam carries out an epidemiological vigilance consisting in the follow-up of animls destined for slaughteringin order to initiate prophylactic actions oriented to eliminate eventual sources of trichinosis infection for human and rearing pigs
Polymorphism of locus DRB3.2 in populations of Creole Cattle from Northern Mexico
Fernández, Ilda G.;Ramírez, José Gonzalo Ríos;Vázquez, Amanda Gayosso;Arvizu, Raúl Ulloa;Morales, Rogelio A. Alonso;
Genetics and Molecular Biology , 2008, DOI: 10.1590/S1415-47572008005000020
Abstract: keywords : bola-drb3.2; polymorphism; creole cattle; pcr-rflp.
Colour behaviour on mango (Mangifera indica) slices self stabilized in glass jars by hurdle technology during storage
JA Ulloa, H Escalona, L Díaz
African Journal of Biotechnology , 2008,
Abstract: The effect of the syrup composition on behaviour colour of self stabilized mango slices in glass jars by hurdle technology during 180 days of storage was studied through 26-2 fractional factorial design. L* (lightness), a* (redness and greenness), and b* (yellowness and blueness) values were measured with a colorimeter and then hue angle (H*) and chroma (C*) calculated, each 30 days. At the end of storage period, the pH and ascorbic acid influenced significantly (p < 0.05) the b* and C* values, while potassium sorbate the L*, b* and H* values, and sodium bisulphite the a* and H* values. These results could help to select the better syrup formulation for the self stabilization of mango slices in glass jars by hurdle technology in terms of colour quality.
Brotes epizoóticos de triquinosis en dos criadores de cerdos de la Región Metropolitana, Chile.
Schenone,Hugo; Burgos,Marisol; Ulloa,Marcelo; Acu?a,Pedro; Ojeda,Julio; Silva,José Rolando; Ibá?ez,Oscar; Schenone,Hugo;
Boletín chileno de parasitología , 1999, DOI: 10.4067/S0365-94021999000300014
Abstract: in chile swine trichinosis has presented a progressive decreasing in the last two decades of xx century. t. spiralis pig infection descended from an average of 0.683 per 1000 in 1980-1984 to 0.315 in 1985-1989 andto 0.115 in 1990-1996. in the particular case of metropolitan region this decreasing has been more marked: from an average of 0.058 per 1000 in 1990-1994to 0.003 in 1995-1999. between the end of june 1999 and middle january 2000 in metropolitanregion abattoirs t. spiralis was detected in 15 (4.9%) out of 306 swine from two pigsties located in el monte (e.m.) and padre hurtado (p.h.) 45 and 30 km south-west from santiago. in the same period another four pigs from the same premises were found infected in abattoirs of other regions. during inspection visits it was stated that both pig farms had deficient sanitary conditions. phototrichinoscopy was positive in three out of five rattus norvegicus collected in e.m. in pigsty ph the examination of diaphragm samples of 25 dogs and 17 cats resulted negative. in the premises originating t. spirali infected swine the metropolitan environmetal health service abattoirs progam carries out an epidemiological vigilance consisting in the follow-up of animls destined for slaughteringin order to initiate prophylactic actions oriented to eliminate eventual sources of trichinosis infection for human and rearing pigs
Genetic engineering applications in animal breeding
Montaldo,Hugo H.;
Electronic Journal of Biotechnology , 2006,
Abstract: this paper discusses the use of genetic engineering applications in animal breeding, including a description of the methods, their potential and current uses and ethical issues. genetic engineering is the name of a group of techniques used to identify, replicate, modify and transfer the genetic material of cells, tissues or complete organisms. important applications of genetic engineering in animal breeding are: 1) marker-assisted selection (mas). the objective of this technology is to increase disease resistance, productivity and product quality in economically important animals by adding information of dna markers to phenotypes and genealogies for selection decisions. 2) transgenesis, the direct transfer of specific genes/alleles between individuals, species, or even kingdoms, in order to change their phenotypic expression in the recipients. compared to the 'traditional' improvement techniques based on phenotypic information only, these gene-by-gene techniques allow theoretically a more complete management of animal genomes for animal breeding. in spite of high expectations and new technical developments, its actual efficiency is not always high, as they require a thorough knowledge of functional genomics, and pose additional technical, economical and ethical problems. the possible role for cloning adult animals in breeding is also discussed.
Producción de conocimientos e integración sudamericana: Poder pensar una universidad de la UNASUR
Trinchero,Héctor Hugo;
Papeles de trabajo - Centro de Estudios Interdisciplinarios en Etnoling???-stica y Antropolog?-a Socio-Cultural , 2011,
Abstract: this article refers to and supports the need of forming a university project for the unasur. this is still an idea-proposal that has been taken into consideration by intellectuals, academicians, political and social leaders. this idea-proposal is an initial contribution to a debate that should involve not only members of the latin american academic community but also and mainly the political and social leadership which is leading today the transformation model of south american countries.
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