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Search Results: 1 - 10 of 37421 matches for " Juárez-Mosqueda "
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Sperm Quality in Holstein Bulls Friesian and Brahmans of Frozen Semen Commercially  [PDF]
Alejandro Córdova-Izquierdo, Gustavo Ruiz-Lang, Román Espinosa-Cervantes, Adrían Emmanuel Iglesias-Reyes, Maximino Méndez-Mendoza, Rubén Huerta-Crispín, Abel Edmundo Villa-Mancera, Ma. De Lourdes Juárez-Mosqueda, Pedro Sánchez-Aparicio, Jaime Olivares-Pérez, Juan Eulogio Guerra-Liera, Gerardo Cansino-Arroyo
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.53026
Abstract: The aim of this study was to assess sperm quality (motility, viability and acrosomal integrity) sperm from commercially frozen semen straws two breeds of bulls Bos taurus (holstein Frisian) and Bos indicus (Brahman). 9 commercial straws 0.5 ml of Holstein bull semen and 9 Brahman bull were thawed, they were kept for two hours at room temperature and motility, viability and acrosomal integrity (NAR) was assessed. The results were 30% motility, viability 40% and 30% of NAR in the Holstein breed. Brahma race for motility 40%, 50% and 40% viability was obtained NAR. In conclusion, according to the results of the variables analyzed, the Brahman breed in sperm quality was better than the Holstein breed; however, the results of both races meet minimum standards of quality sperm for use in artificial insemination (AI) field level.
Participación de enzimas translocasas en la reacción acrosomal del espermatozoide de conejo
Mayren-Mendoza, Félix de Jesús,Juárez-Mosqueda, María de Lourdes,Vergara-Onofre, Marcela,Toledano-Olivares, ángel
REDVET , 2012,
Abstract: ResumenEste estudio se realizó con la finalidad de evaluar la participación de enzimas translocadoras de fosfolípidos en el proceso de reacción acrosomal, en espermatozoides de conejo obtenidos de la región caudal del epidídimo, utilizando la progesterona como inductor de reacción acrosomal y NEtilmaleimida como inhibidor de translocasas.SummaryThis study was conducted in order to evaluate the participation of translocating enzymes of phospholipids in the reaction process acrosomal in rabbit sperm obtained from the caudal region of epididymis, using progesterone as inducer of acrosome reaction and N-ethylmaleimide as an inhibitor of translocase.
Reproductive parameters of the southern stingray Dasyatis americana in southern gulf of Mexico
Ramírez-Mosqueda,Edith; Pérez-Jiménez,Juan Carlos; Mendoza-Carranza,Manuel;
Latin american journal of aquatic research , 2012,
Abstract: the southern stingray dasyatis americana (hildebrand & schroeder, 1928) is the most landed elasmobranch by small-scale fleets in southern gulf of mexico. however, little is known of its life history parameters in this region. in this study, a total of 900 specimens were collected from february 2006 to december 2008 to determine the reproductive parameters needed for population assessments by means of ecological risk assessments or demographic analysis. results suggested that females of d. americana reproduce annually, with a gestation of 7-8 months. the reproductive cycle of females is asynchronous, with ovulation and parturition occurring throughout the year. females and males matured at 764 and 517 mm disc width (dw50) respectively. d. americana has one of the highest fecundity among dasyatids, from 2 to 7 embryos, with a sex ratio of embryos of 1:1. a linear relationship between maternal dw and fecundity was estimated, the larger females contain more embryos. the status of the population of d. americana is a cause of concern in the southern gulf of mexico due to its high frequency of capture in artisanal fisheries and its apparently low biological productivity.
Reproductive parameters of the southern stingray Dasyatis americana in southern gulf of Mexico Parámetros reproductivos de la raya látigo americana Dasyatis americana en el sur del golfo de México
Edith Ramírez-Mosqueda,Juan Carlos Pérez-Jiménez,Manuel Mendoza-Carranza
Latin american journal of aquatic research , 2012,
Abstract: The southern stingray Dasyatis americana (Hildebrand & Schroeder, 1928) is the most landed elasmobranch by small-scale fleets in southern gulf of Mexico. However, little is known of its life history parameters in this region. In this study, a total of 900 specimens were collected from February 2006 to December 2008 to determine the reproductive parameters needed for population assessments by means of ecological risk assessments or demographic analysis. Results suggested that females of D. americana reproduce annually, with a gestation of 7-8 months. The reproductive cycle of females is asynchronous, with ovulation and parturition occurring throughout the year. Females and males matured at 764 and 517 mm disc width (DW50) respectively. D. americana has one of the highest fecundity among dasyatids, from 2 to 7 embryos, with a sex ratio of embryos of 1:1. A linear relationship between maternal DW and fecundity was estimated, the larger females contain more embryos. The status of the population of D. americana is a cause of concern in the southern gulf of Mexico due to its high frequency of capture in artisanal fisheries and its apparently low biological productivity. La raya látigo americana Dasyatis americana (Hildebrand & Schroeder, 1928), conocida como balá en México, es el elasmobranquio más capturado y desembarcado por flotas artesanales en el sur del golfo de México. Sin embargo, se conoce poco de sus parámetros de historia de vida en esta región. En este estudio, fueron analizados 900 ejemplares entre febrero 2006 y diciembre 2008 para determinar los parámetros reproductivos necesarios para evaluaciones poblacionales por medio de análisis demográficos o evaluaciones de riesgo ecológico. Los resultados sugieren que las hembras de D. americana se reproducen anualmente, con una gestación de 7-8 meses aproximadamente. El ciclo reproductivo de las hembras es asincrónico, con la ovulación y alumbramiento ocurriendo a lo largo de todo el a o. Las hembras y los machos maduran a los 764 y 517 mm de ancho de disco (AD50), respectivamente. D. americana tiene una de las fecundidades más altas entre los dasyatidos, de 2 a 7 embriones, y con una proporción de sexos de 1:1 en los embriones. Existe relación significativa lineal entre la longitud de las hembras y la fecundidad, las hembras más grandes contenían más embriones. El estado de la población de D. americana es motivo de preocupación en el sur del golfo de México debido a que es muy frecuente en las capturas de pesquerías artesanales y a que su productividad biológica es aparentemente baja.
Alteraciones en la integridad del acrosoma y de la teca perinuclear en semen criopreservado de verraco
Barrientos Morales,Manuel; Juárez Mosqueda,María De L; Trujillo Ortega,María E; Montiel Palacios,Felipe;
Zootecnia Tropical , 2009,
Abstract: the objective of this study was to investigate the effect of cryopreservation on the integrity of the acrosome and the perinuclear theca substructure (pts) of boar spermatozoa. semen from six boars was used. the semen was collected, diluted, and sperm motility and concentration determined. only ejaculates showing ≥70% motility were used in this study. diluted semen was divided in two samples: one to be evaluated fresh, and other to be evaluated after freezing-thawing. fresh and frozen-thawed semen samples were used to assess sperm viability and acrosome integrity by light microscopy using the triple staining technique and to evaluate the pts integrity by electron microscopy. the frozen-thawed semen had a greater proportion (p<0.05) of acrosome reacted live spermatozoa, compared to the fresh semen. the freezing-thawing process reduced (p<0.05) the proportion of intact pts spermatozoa. the value of acrosome reacted spermatozoa was correlated with the proportion of spermatozoa with altered or absent pts, both in fresh (r=0.93; p<0.05) and in frozen-thawed (r=0.71; p<0.05) semen. in conclusion, cryopreserved boar semen showed some alterations in the integrity of the acrosome and the pts that might be due to cryocapacitation.
Qué son las células troncales o células madre ?
Santiago René Anzaldúa Arce,María de Lourdes Juárez Mosqueda,Héctor Villase?or Gaona,María Cristina Ríos Mas
Veterinaria México , 2007,
Abstract: En el presente trabajo se realiza una revisión actualizada sobre los principales aspectos generales de las células troncales: antecedentes históricos, defi nición de las células troncales con base en sus principales características (grado de indiferenciación, pluripotencialidad, capacidad de autorrenovación y reintegración a tejidos embriona-rios); clasifi cación de las células troncales por su grado de diferenciación (células troncales totipotenciales, células troncales pluripotenciales, células troncales multipotenciales y células troncales de tejidos y órganos específi cos); origen de las células troncales pluripotenciales (células de carcinoma embrionario, células troncales embrionarias y células germinales embrionarias); principales métodos para obtener células troncales embrionarias (utilización de mórulas, blastocistos completos e inmunocirugía del macizo celular interno); principales métodos para obtener células troncales de tejidos adultos (purifi cación de sangre periférica, de sangre de cordón umbilical, de médula ósea completa y de tejido nervioso).
Desarrollo de simuladores para procesos industriales. Parte II (Colada continua)
Ramírez, A.,Mosqueda, A.,Sauce, V.,Morales, R.
Revista de Metalurgia , 2006,
Abstract: The understanding of steel thermal behavior is very important in order to take care the quality of the products like billets and slabs due to these; this work shows the join of a subroutine to simulate the heat transfer conditions during the continuous casting process to the model for simulating the process described by the present authors in a previous work[1]; the result is the temperature profiles and surface temperature graphics of the steel, then they are compared with data carried out of real operating conditions. El estudio del comportamiento térmico del acero es de gran importancia para controlar la calidad de productos como perfiles colados, por lo que el presente trabajo muestra el acoplamiento de una subrutina, para simular las condiciones de extracción de calor que ocurren durante el proceso de colada continua, a la rutina de simulación del proceso descrita por los presentes autores en un trabajo previo[1]; como resultado se obtienen los perfiles de temperatura del acero y las graficas de temperatura superficial de este y, posteriormente, se procede a la validación del sistema con datos de condiciones reales de operación.
Rectas perpendiculares
rez Juárez, ángel;
Educación matemática , 2010,
Abstract: a proof of the orthogonality condition between two lines without using trigonometric functions is presented. the alternative proof consists in developing a second degree equation and working with quadratic equations properties, such as the relationship between the number of solutions and the discriminant sign. this approach shows as well the usefulness of some of the properties of a quadratic polynomial.
Jurisdicción espa ola y poligamia islámica: un matrimonio forzoso?
Pilar Juárezrez
Revista Electrónica de Estudios Internacionales , 2012,
Abstract: This paper analyzes the treatment that polygamous marriage receives in the various orders of the Spanish jurisdiction. Remarkable differences can be appreciated between different orders: from its typification as a criminal offence in the criminal order to the granting of significant legal rights in the social order. This disparity has highlighted, over recent years, that the lack of legal regulation of polygamy may be a very relevant matter if it causes legal uncertainty. Our judges are forced to respond to claims that the Spanish legislator has not foreseen or regulated for, being the first affected by a legislative gap that raises important objections from the point of view of legal certainty.
El legado de Durkheim en Schutz: Hacia un horizonte en común
Juárez,Benjamín;
Enfoques , 2008,
Abstract: the relation between the works of alfred schutz and emile durkheim guides the interest of this article. we are interested in finding the contributions with which durkheim has enlightened schutz intellectual growth. the plan is to read schutz′s texts looking for vestiges of the french author, going from the level of the explicit quotes to the implicit and the potentialities. (first we will see the way in which schutz weighs conceptual schemes; and afterwords makes considerations on group, communication, formation of categories and even of war and inheritance.) furthermore, observations shall be given in order to clarify the common aspects between both authors as well as the gap that separates them. towards the end we will make some suggestions for future readings in which the two thinkers combine and articulate.
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