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Papers by Gilberto Yong Angel

CIENCIA ergo sum, 2018

Se evaluó el comportamiento productivo de bovinos doble propósito en un sistema silvopastoril int... more Se evaluó el comportamiento productivo de bovinos doble propósito en un sistema silvopastoril intensivo (SSPi) en Apatzingán, Michoacán. La actividad se llevó a cabo mediante seguimiento técnico-económico. Asimismo, se monitorearon variables productivas y económicas (consumo de forraje, producción de leche, peso, ingresos y egresos) de 60 vacas de la raza Gyr analizadas mediante estadística descriptiva y presupuestos por actividad. La carga animal empleada fue de 2.06 UA ha-1 y la producción de leche obtenida fue 9.15 kg vaca-1 día-1. El manejo de vacas Gyr en un SSPi favorece la producción de leche y carne y el ingreso económico a la unidad de producción (UP).

La pro duccion de leche en Mexico se desarrolla en condiciones heterogeneas, desde el punto de vi... more La pro duccion de leche en Mexico se desarrolla en condiciones heterogeneas, desde el punto de vista tecnologico, socio economico, y de las explotaciones. El objetivo de este estudio fue tipicar los sistemas campesinos de produccion de leche (SCPL) del municipio de Tejupilco en el sur del Estado de Mexico. Se aplicaron encuestas considerando variables productivas, sociales y economicas en 50 unidades campesinas productoras de leche. El analisis estadistico de los resultados se realizo por medio de analisis de factores y un analisis conglomerados. Se obtuvieron tres factores que explican el 67 % de la variacion total. El analisis de conglomerados identifico cuatro grupos de productores, los cuales presentan diferencias en volumen de produccion de leche, tamano de la unidad de produccion y numero de vacas. El analisis economico mostro que 60 % de los costos de produccion se debe a la compra de alimento concentrado para las vacas. La fuente principal de ingresos es la venta de leche en...

Current Topics in Medicinal Chemistry, 2020

Aims: The present study aims to determine the phototoxic and haemolytic activity of organophospho... more Aims: The present study aims to determine the phototoxic and haemolytic activity of organophosphorus. The use of alternative in vitro assays with human erythrocytes is suggested to predict the polluting effect of these products on health. Methodology: Human erythrocytes from Toluca Blood Bank were used. Sodium dodecyl sulfate was employed as a positive control. Additionally, the haemolysis percentage of three organophosphate (Acetate, Chlorpyrifos, Malathion, Methamidophos, Methyl Parathion) induced photo haemolysis formulated with surfactants on a concentration of 2 x 109 erythrocytes were evaluated. Finally, the products were classified as irritant or phototoxic. Results: Results showed that the HC50 red blood cells were similar for each organophosphate (Malathion and Methamidophos) indicating very irritant action with ratio classification (L/D) of 0.041 and 0.053, respectively. On the other hand, Chlorpyrifos was classified as an irritant with L/D= 0.14. On the other hand, the HC...

Microbial Pathogenesis, 2018

Drug-resistant Salmonella is frequently detected in most parts of the world, and its rate of resi... more Drug-resistant Salmonella is frequently detected in most parts of the world, and its rate of resistance has increased significantly in recent years. However, this study aimed to evaluate the minimum inhibitory concentration (MIC, determined with the Kirby-Bauer method) of quinolones in 86 Salmonella spp. strains isolated from pigs. Both the inside and outside of the QRDR region of strains were sequenced. The DNA sequence of the QRDR region of Salmonella spp. revealed the mutations S83F, D87N and S83Y. The region outside the QRDR showed a mutation in L582G. Forty-five isolates of Salmonella ssp. were categorized as quinolone-resistant; out of these, 16 corresponded to Salmonella enterica and isolates showed intermediate resistance (6.25 %) to nalidixic acid. Three isolats (18.6 %) were resistant to ampicillin; two (12.5%) were resistant to carbenicillin. Moreover, three (18.7%) isolates were resistant to gentamicin, nitrofurantoin and pefloxacin, and 8 (50 %) were resistant to trimethoprim/sulfamethoxazole.. Six percent of Salmonella spp. strains showed less resistance to antimicrobial agents compared to S. Thyphimurium (18 %). The resistance to individual quinolones varied by serotypes. For S. anatum and S. Reading, it was 12.25 %, and for S. choreaeaesuis, S. typhimurium monofasica, 6.25 %. In contrast, S. agona, S. bredeney and S. london were sensitive to these antibiotics. In conclusion, quinolones have become the drugs of choice for the treatment of severe Salmonella infections.The study of mutations outside the QRDR region opens up new insights about the resistance of Salmonella to fluoroquinolones.

Current Pharmaceutical Design, 2016

Trabajo relacionado con la evaluacion financiera de unidades de produccion de ganado bovino

Trabajo relacionado con la sostenibilidad de sistemas ganaderosEn la actualidad, el sector agrope... more Trabajo relacionado con la sostenibilidad de sistemas ganaderosEn la actualidad, el sector agropecuario atraviesa uno de los momentos más controversiales de su historia a nivel mundial, con la disyuntiva de aumentar la producción de alimento para consumo humano y, a su vez, reducir el impacto ambiental relacionado con sus actividades. De acuerdo con lo reportado por la FAO, la demanda de proteínas de origen animal se duplicará para el año 2050, debido al incremento de la población mundial (FAO, 2011: 78). Una de las opciones para cubrir la demanda de alimentos para la población, es la intensificación sostenible de las actividades agropecuarias (Riar, Coventry, 2013: 64), debido al efecto de las actividades antropogénicas sobre los agroecosistemas (Steinfeld et al., 2006: 2

Ciência Rural, 2014

The objective of the present study was to simulate the effect of the seasonal variation of climat... more The objective of the present study was to simulate the effect of the seasonal variation of climate on the nutritional value and dry matter yield of star grass and its capacity to support milk production alone or with concentrate supplementation in small-scale milk production systems in the tropical regions of Mexico. Two mathematical simulation models were used, the first model simulates the growth and yield of star grass (Cynodon plectostachyus), and the second model simulates the productive performance of dairy cows. Both models were integrated in a decision-making support system (DSSTROP). Model's predictions were validated by a calibration exercise for each data set from three experiments on the effect of concentrate supplementation on milk yield. The DSSTROP predictions and the results from the experiments were compared by regression analysis. The results suggest that the DSSTROP adequately predicts milk production (R2=0.74). The DSSTROP predictions suggest that milk produc...

CIENCIA ergo sum, 2018

Se evaluó el comportamiento productivo de bovinos doble propósito en un sistema silvopastoril int... more Se evaluó el comportamiento productivo de bovinos doble propósito en un sistema silvopastoril intensivo (SSPi) en Apatzingán, Michoacán. La actividad se llevó a cabo mediante seguimiento técnico-económico. Asimismo, se monitorearon variables productivas y económicas (consumo de forraje, producción de leche, peso, ingresos y egresos) de 60 vacas de la raza Gyr analizadas mediante estadística descriptiva y presupuestos por actividad. La carga animal empleada fue de 2.06 UA ha-1 y la producción de leche obtenida fue 9.15 kg vaca-1 día-1. El manejo de vacas Gyr en un SSPi favorece la producción de leche y carne y el ingreso económico a la unidad de producción (UP).

La pro duccion de leche en Mexico se desarrolla en condiciones heterogeneas, desde el punto de vi... more La pro duccion de leche en Mexico se desarrolla en condiciones heterogeneas, desde el punto de vista tecnologico, socio economico, y de las explotaciones. El objetivo de este estudio fue tipicar los sistemas campesinos de produccion de leche (SCPL) del municipio de Tejupilco en el sur del Estado de Mexico. Se aplicaron encuestas considerando variables productivas, sociales y economicas en 50 unidades campesinas productoras de leche. El analisis estadistico de los resultados se realizo por medio de analisis de factores y un analisis conglomerados. Se obtuvieron tres factores que explican el 67 % de la variacion total. El analisis de conglomerados identifico cuatro grupos de productores, los cuales presentan diferencias en volumen de produccion de leche, tamano de la unidad de produccion y numero de vacas. El analisis economico mostro que 60 % de los costos de produccion se debe a la compra de alimento concentrado para las vacas. La fuente principal de ingresos es la venta de leche en...

Current Topics in Medicinal Chemistry, 2020

Aims: The present study aims to determine the phototoxic and haemolytic activity of organophospho... more Aims: The present study aims to determine the phototoxic and haemolytic activity of organophosphorus. The use of alternative in vitro assays with human erythrocytes is suggested to predict the polluting effect of these products on health. Methodology: Human erythrocytes from Toluca Blood Bank were used. Sodium dodecyl sulfate was employed as a positive control. Additionally, the haemolysis percentage of three organophosphate (Acetate, Chlorpyrifos, Malathion, Methamidophos, Methyl Parathion) induced photo haemolysis formulated with surfactants on a concentration of 2 x 109 erythrocytes were evaluated. Finally, the products were classified as irritant or phototoxic. Results: Results showed that the HC50 red blood cells were similar for each organophosphate (Malathion and Methamidophos) indicating very irritant action with ratio classification (L/D) of 0.041 and 0.053, respectively. On the other hand, Chlorpyrifos was classified as an irritant with L/D= 0.14. On the other hand, the HC...

Microbial Pathogenesis, 2018

Drug-resistant Salmonella is frequently detected in most parts of the world, and its rate of resi... more Drug-resistant Salmonella is frequently detected in most parts of the world, and its rate of resistance has increased significantly in recent years. However, this study aimed to evaluate the minimum inhibitory concentration (MIC, determined with the Kirby-Bauer method) of quinolones in 86 Salmonella spp. strains isolated from pigs. Both the inside and outside of the QRDR region of strains were sequenced. The DNA sequence of the QRDR region of Salmonella spp. revealed the mutations S83F, D87N and S83Y. The region outside the QRDR showed a mutation in L582G. Forty-five isolates of Salmonella ssp. were categorized as quinolone-resistant; out of these, 16 corresponded to Salmonella enterica and isolates showed intermediate resistance (6.25 %) to nalidixic acid. Three isolats (18.6 %) were resistant to ampicillin; two (12.5%) were resistant to carbenicillin. Moreover, three (18.7%) isolates were resistant to gentamicin, nitrofurantoin and pefloxacin, and 8 (50 %) were resistant to trimethoprim/sulfamethoxazole.. Six percent of Salmonella spp. strains showed less resistance to antimicrobial agents compared to S. Thyphimurium (18 %). The resistance to individual quinolones varied by serotypes. For S. anatum and S. Reading, it was 12.25 %, and for S. choreaeaesuis, S. typhimurium monofasica, 6.25 %. In contrast, S. agona, S. bredeney and S. london were sensitive to these antibiotics. In conclusion, quinolones have become the drugs of choice for the treatment of severe Salmonella infections.The study of mutations outside the QRDR region opens up new insights about the resistance of Salmonella to fluoroquinolones.

Current Pharmaceutical Design, 2016

Trabajo relacionado con la evaluacion financiera de unidades de produccion de ganado bovino

Trabajo relacionado con la sostenibilidad de sistemas ganaderosEn la actualidad, el sector agrope... more Trabajo relacionado con la sostenibilidad de sistemas ganaderosEn la actualidad, el sector agropecuario atraviesa uno de los momentos más controversiales de su historia a nivel mundial, con la disyuntiva de aumentar la producción de alimento para consumo humano y, a su vez, reducir el impacto ambiental relacionado con sus actividades. De acuerdo con lo reportado por la FAO, la demanda de proteínas de origen animal se duplicará para el año 2050, debido al incremento de la población mundial (FAO, 2011: 78). Una de las opciones para cubrir la demanda de alimentos para la población, es la intensificación sostenible de las actividades agropecuarias (Riar, Coventry, 2013: 64), debido al efecto de las actividades antropogénicas sobre los agroecosistemas (Steinfeld et al., 2006: 2

Ciência Rural, 2014

The objective of the present study was to simulate the effect of the seasonal variation of climat... more The objective of the present study was to simulate the effect of the seasonal variation of climate on the nutritional value and dry matter yield of star grass and its capacity to support milk production alone or with concentrate supplementation in small-scale milk production systems in the tropical regions of Mexico. Two mathematical simulation models were used, the first model simulates the growth and yield of star grass (Cynodon plectostachyus), and the second model simulates the productive performance of dairy cows. Both models were integrated in a decision-making support system (DSSTROP). Model's predictions were validated by a calibration exercise for each data set from three experiments on the effect of concentrate supplementation on milk yield. The DSSTROP predictions and the results from the experiments were compared by regression analysis. The results suggest that the DSSTROP adequately predicts milk production (R2=0.74). The DSSTROP predictions suggest that milk produc...