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Search Results: 1 - 10 of 305923 matches for " Jhon J. Ca?as-álvarez "
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ESTUDIO DEL POLIMORFISMO HINFI DEL GEN PIT-1 Y SU ASOCIACIóN CON CARACTERíSTICAS DE TIPO, PRODUCCIóN DE LECHE Y DíAS ABIERTOS DE VACAS HOLSTEIN EN EL DEPARTAMENTO DE ANTIOQUIA, COLOMBIA STUDY OF HINFI POLYMORPHISMS OF THE PIT-1 GENE AND THEIR ASSOCIATIONS WITH TYPE TRAITS, MILK YIELD AND DAYS OPEN IN HOLSTEIN COWS FROM ANTIOQUIA, COLOMBIA
Juan D. Corrales-álvarez,Mario F. Cerón-Mu?oz,Jhon J. Ca?as-álvarez,Cristina Acevedo-Valladarez
Actualidades Biológicas , 2010,
Abstract: El objetivo de este estudio fue determinar las frecuencias alélicas y fenotípicas del polimorfismo de nucleótido simple (SNP) del exón VI del gen Pit-1 y su asociación con características de tipo, producción de leche y días abiertos. Se muestrearon un total de 390 vacas Holstein del departamento de Antioquia (Colombia), genotipificadas para el polimorfismo Hinfi de Pit-1 por PCR-RFLP. Se encontraron los genotipos AA, AB y BB con frecuencia de 0,03, 0,43 y 0,53, respectivamente. El alelo A tuvo frecuencia de 0,35 y su presencia en el genotipo se asoció con mayor producción de leche, profundidad de la ubre y del cuerpo; la ausencia del alelo A en el genotipo se asoció con menores días abiertos. Este estudio indica que es posible desarrollar programas de selección usando el gen Pit-1 en bovinos Holstein del departamento de Antioquia. The aim of this study was to determine allele and phenotypic frequencies for single nucleotide polymorphism (SNP) of exon VI in the Pit-1 gene and their associations with type traits, milk yield, and days open. A total of 390 Holstein cows from Antioquia (Colombia) were genotyped for the Pit-1 Hinfi polymorphism by PCR-RFLP. We found AA, AB, and BB genotypes with a frequency of 0.03, 0.43, and 0.53, respectively. The A allele frequency was 0.35 and its presence in the genotype was associated with higher milk production, udder depth and body depth; the absence of the A allele in the genotype was associated with fewer days open. This study indicates that it is possible to develop breeding programs using the Pit-1 gene in Holstein cattle in the department of Antioquia.
ESTUDIO DEL POLIMORFISMO HINFI DEL GEN PIT-1 Y SU ASOCIACIóN CON CARACTERíSTICAS DE TIPO, PRODUCCIóN DE LECHE Y DíAS ABIERTOS DE VACAS HOLSTEIN EN EL DEPARTAMENTO DE ANTIOQUIA, COLOMBIA
Corrales-álvarez,Juan D.; Cerón-Mu?oz,Mario F.; Ca?as-álvarez,Jhon J.; Acevedo-Valladarez,Cristina; Sepúlveda-Restrepo,Jeannie C.; Calvo-Cardona,Samir J.; Moreno-Ochoa,Manuel;
Actualidades Biológicas , 2010,
Abstract: the aim of this study was to determine allele and phenotypic frequencies for single nucleotide polymorphism (snp) of exon vi in the pit-1 gene and their associations with type traits, milk yield, and days open. a total of 390 holstein cows from antioquia (colombia) were genotyped for the pit-1 hinfi polymorphism by pcr-rflp. we found aa, ab, and bb genotypes with a frequency of 0.03, 0.43, and 0.53, respectively. the a allele frequency was 0.35 and its presence in the genotype was associated with higher milk production, udder depth and body depth; the absence of the a allele in the genotype was associated with fewer days open. this study indicates that it is possible to develop breeding programs using the pit-1 gene in holstein cattle in the department of antioquia.
Estimación de las curvas de lactancia en ganado Holstein y BON x Holstein en trópico alto colombiano
Jhon J Ca?as A,Luis F Restrepo B,Jorge Ochoa S,Alex Echeverri
Revista Lasallista de Investigación , 2009,
Abstract: Introducción. Los cambios en la producción de leche en un tiempo determinado pueden ser representados gráficamente por una curva de lactancia que permite la caracterización de los diferentes sistemas productivos. Objetivo. Estimar curvas de lactancia en ganado Holstein y Holstein x BON por medio del modelo Gamma Incompleto y explicar el efecto del grupo genético y algunos factores ambientales sobre los coeficientes de la curva de lactancia. Materiales y métodos. Se utilizaron 1835 datos de producción de leche de las dos primeras lactancias de 23 vacas. Se determinó el efecto de la raza, el parto y la época sobre los diferentes coeficientes estimados a partir del modelo Gamma Incompleto y otras características productivas y reproductivas de interés. Resultados. Entre los grupos raciales se encontraron diferencias significativas para las características: producción inicial, producción total, duración de la lactancia, producción de leche en el pico y en la semana 33, producción por día, pendiente o grado de inclinación posterior al pico, número de semanas por encima de 15 litros, intervalo entre partos y producción de leche por día de intervalo entre partos (P<0.05). Entre partos se presentó diferencia significativa en las características producción inicial, desaceleración de la curva, producción de leche en el pico, producción por día, pendiente o grado de inclinación posterior al pico, persistencia, porcentaje de persistencia y número de semanas por encima de 15 litros (P<0.05). Entre las épocas no hubo diferencias significativas (P>0.05), a excepción del número de semanas por encima de 15 litros (P<0.05). Conclusión. Los coeficientes estimados a partir del modelo Gamma Incompleto están altamente influenciados por el grupo genético, por el número de partos, y en menor medida por la época climática.
Estimación de las curvas de lactancia en ganado Holstein y BON x Holstein en trópico alto colombiano
Ca?as A,Jhon J; Restrepo B,Luis F; Ochoa S,Jorge; Echeverri,Alex; Cerón-Mu?oz,Mario;
Revista Lasallista de Investigación , 2009,
Abstract: introduction. changes in milk production in a given time can be graphically represented by using a lactation curve, which allows the characterization of the different production systems. objective. to estimate lactation curves in holstein and bon x holstein cattle by using the incomplete gamma model and explain the effects of the genetic group and of some environmental factors on the coefficients of the lactation curve. materials and methods. 1835 milk production records from the first and second lactations of 23 cows were used. the effects of the race, the birth and the time on the different coefficients estimated from the incomplete gamma model and other production and reproduction characteristics of interest were determined. results. significant differences among the racial groups were evident for the following characteristics: initial production, total production, duration of the lactation period, milk production at the peak and in the 33rd week, production per day, post-peak slope, number of weeks with production above 15 litters, calving interval and the milk production per day of calving interval (pconclusion. the coefficients estimated by using the incomplete gamma model are highly influenced by the genetic group, the number of births and, in a lower measure, by the weather.
Búsqueda activa de casos de sobrecarga de hierro en un hospital universitario
Khosravi Shahi,P.; Ca?o Hortoneda,M.; Castillo Rueda,A. del; Portugal álvarez,J. de;
Anales de Medicina Interna , 2003, DOI: 10.4321/S0212-71992003000200004
Abstract: background: the epidemiologic importance of iron overload disorders and the clinical lack of its diagnosis led us to an active search of cases among the hospitalized patients in a general university hospital. this situation will make it possible to have a larger and earlier number of diagnosis together with a preventive intervention and an effective treatment. patients and methods: a transverse study was performed on patients admitted to a fifteen bedsward in the internal medicine department. they have all been applied, without exclusion criteria, the iron metabolism parameters survey. the transferrin saturation (ts), due to its sensitivity, specificity and positive predictive value, has been considered appropriate for the phenotypic screening of the iron overload disorders. subjects with fasting ts of 45% or more were considered as risk population. results: the study comprised 117 patients with an average age of 69.9±15.04. the high-risk population rate was 13.8% with an average age of 60.8±20.17, as compared to the low-risk population with an average age of 71.3±13.7 (p<0.05). the most outstanding illnesses associated to the high-risk population are chronic hepatitis and diabetes mellitus (31.25%). an 18.7% of the cases show undernourishment. conclusions: the iron overload is a prevalent illness whose early diagnosis requires a high clinical suspicion. the active search among the hospitalized patients, who have been made a ts, benefits the new cases detection. the ts is a screening technique with a high diagnostic profitability if you evaluate correctly the false positives. for that reason, we think the ts has to be included within the analytic requests which patients are made when admitted to hospital.
SCAVENGING ACTIVITY OF DICLOFENAC: INTERACTION WITH ABTS RADICAL CATION AND PEROXYL RADICALS
C ROJO,M. J áLVAREZ-FIGUEROA,M SOTO,A CA?ETE
Journal of the Chilean Chemical Society , 2009,
Abstract: The scavenging activity of diclofenac was estimated by its capability to bleach ABTS radical cation, and ORAC (oxygen radical absorbance capacity) methodology. In addition, GC-MS technique was used to establish if the lactamic derivative of diclofenac was formed as final product in the interaction with peroxyl radicals. Diclofenac bleached ABTS radical cation in a concentration-dependent way. In ORAC assays, diclofenac inhibited the consumption of fluorescein and c-phycocyanin mediated by peroxyl radicals. An ORAC-fluorescein, and ORAC-c-phycocyanin value of 0.3, and 0.004 was estimated, respectively. From the downcurvature observed in Stern-Volmer-like plots, we postulated that the low protection of c-phycocyanin is related to secondary damage of c-phycocyanin by the secondary radical of diclofenac. By GC-MS studies only a 2,6-dichloroaniline derivative was detected as product afterthe reaction with peroxyl radicals.
Efectos del uso de la tecnología computacional sobre la articulación de los sistemas de representación de la parábola en un grupo de alumnos
Carlos J. Rojas álvarez,Navis M. Londo?o Camargo,Dorleys E. Ca?ate Salinas,Ricky N. Abuabara Cortés
Zona Próxima , 2009,
Abstract: El presente artículo se basa en los resultados de la investigación sobre la importancia del uso de la tecnología computacional sobre los diferentes sistemas de representación de la parábola en un grupo de alumnos. Se le aplicó el pretest al grupo experimental y al grupo control, de un total de 91 estudiantes correspondientes al grado décimo. El instrumento incluía actividades en la articulación de los sistemas de representación: primero, conversión del sistema algebraico al gráfico, el cual es el sistema que los estudiantes manejan con mayor facilidad; segundo, conversión del sistema gráfico al algebraico en donde se encontraron mayores dificultades. Al grupo experimental se les ense ó la articulación de los sistemas de representación de la parábola mediante el uso del software educativo Winlab. Posteriormente, se le aplicó un postest a ambos grupos el cual arrojó como resultado que el grupo experimental mostró una mejoría significativa en la conversión del sistema de representación algebraico al gráfico. De igual manera los resultados reflejaron que se debe tener en cuenta, en el proceso de ense anza de la parábola, la conversión del sistema gráfico al algebraico para una mejor compresión del tema en estudio, por lo que el docente debe dise ar actividades donde emplee la articulación de los sistemas de representación algebraico y gráfico; todo esto apoyado en el uso de la tecnología computacional como una herramienta facilitadora de la actividad cognitiva empleada en el área de las matemáticas.
Tratamiento en domicilio de trombosis venosa profunda con heparinas de bajo peso molecular: Experiencia de un a?o
Suárez álvarez,C. G.; García Ca?ete,J.; Herrero Mendoza,M. D.; Bellver álvarez,T. M.; Arboiro Pinel,R.;
Anales de Medicina Interna , 2003, DOI: 10.4321/S0212-71992003000300005
Abstract: treatment of patients with proximal vein thrombosis with low molecular weight heparins is effective and safe. so it allows "hospital at home" care. among low molecular weight heparins tinzaparin is given once daily, making the compliance easier. the twenty patients with deep vein thrombosis who were assisted in the "hospital at home" unit of the clínica nuestra se?ora de la concepción in madrid from december 1999 to december 2000. the mean of age was 71 + 15. the most frequent risk factors were surgery in past three months (19%), known tumour (15%) and previous venous thrombosis (15%). eighteen patients were treated with tinzaparin. no patients showed adverse effects nor complications. low molecular weight heparins, specially tinzaparin, are a safe and effective treatment for deep vein thrombosis in our unit.
Transitional Cell Carcinoma of the Kidney Graft: An Extremely Uncommon Presentation of Tumor in Renal Transplant Recipients
Vital Hevia,Victoria Gómez,Sara álvarez,Víctor Díez Nicolás,Carmen Gómez del Ca?izo,Andrea Orosa,Cristina Galeano álvarez,F. J. Burgos Revilla
Case Reports in Transplantation , 2013, DOI: 10.1155/2013/196528
Abstract: Purpose. Transitional cell carcinoma (TCC) affecting the graft after renal transplantation is a very infrequent way of presentation of this tumor. Our aim is to present our single institution experience with 2 cases, as well as to perform a review of the literature about this tumor after the transplant. Materials and Methods. TCC of the graft developed in 2 of 1365 patients from 1977 to 2010, both cases in women. Data were analyzed for incidence, clinical presentation, treatment, and outcomes. Results. Both cases occurred in 2 mid-age women and resulted to be high grade and locally advanced TCCs, representing an incidence of 0,14% (2/1365). Clinical presentation was urinary obstruction for the first case and incidental ultrasound finding for the second. Preoperative staging was made with CT, cytology, pyelography, ureterorenoscopy, and biopsy. Treatment performed was nephroureterectomy of the graft with bladder cuff and regional lymphadenectomy. Pathological examination showed in both cases a locally advanced and high grade urothelial carcinoma of the pelvis allograft. After 24 and 14 months of followup, both patients are disease free. Conclusions. TCC of the kidney graft is an infrequent tumor that has only been reported in a few cases in the literature. It usually appears at a lower age, more often locally advanced, and with poor differentiation. A multidisciplinary approach to treatment should be required in these cases. 1. Introduction Nowadays, it is widely known that renal transplantation (RT) is the optimal treatment for end stage renal disease. However, after solid organ transplantation, there is a significant increased risk of developing a malignant neoplasm that varies based on cancer type [1]. This condition after RT is believed to depend on the length and type of immunosuppression or is associated with some viral infections. This risk is especially high for nonmelanoma skin cancer, hematological neoplasms, renal cell carcinoma, and thyroid cancer. Instead of this, prostate, testicular, or breast cancers have a lower risk [2]. Other tumors associated to viral infections and induced by that condition—such as hepatobiliary, cervical, or vulvovaginal neoplasms—have a higher incidence on transplant recipients. Transitional cell carcinoma (TCC) of the urinary tract is one of those tumors that appear also more commonly on transplanted population than nontransplanted, varying its incidence according to the series from 0,07% [3] to 1,9% [4]. The possible cause for the increased risk of cancer in this population is due to immunosuppression, which
Youth homelessness: prevention and intervention efforts in Psychology
Sanabria,Jhon J;
Universitas Psychologica , 2006,
Abstract: in this paper, i review the prevention and intervention efforts addressing youth homelessness in the field of psychology between 1994 and 2004. analyses of the literature revealed that the majority of papers including homeless youth as a population for study have focused on issues other than homelessness. these issues include hiv/aids and substance abuse prevention. eleven journal articles addressing youth homelessness were reviewed. these articles focused on outcomes, interventions, and recommendations for clinical practice. literature findings revealed that demographic variables did not predict outcomes for homeless youth; youth returning home with their parents have more positive outcomes than youth moving into other locations, emergency shelter services improve youth’s mental health and social condition, and services should be comprehensive and move beyond the individuals. implications for community psychology, policy makers, and shelters are discussed.
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