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Search Results: 1 - 10 of 188760 matches for " Víctor Manuel;González Rodríguez "
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Computational Method for Extracting and Modeling Periodicities in Time Series  [PDF]
Eduardo González-Rodríguez,ctor Villalobos, Víctor Manuel Gómez-Mu?oz, Alejandro Ramos-Rodríguez
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.56062
Abstract:

Periodicity is common in natural processes, however, extraction tools are typically difficult and cumbersome to use. Here we report a computational method developed in MATLAB through a function called Periods with the aim to find the main harmonic components of time series data. This function is designed to obtain the period, amplitude and lag phase of the main harmonic components in a time series (Periods and lag phase components can be related to climate, social or economic events). It is based on methods of periodic regression with cyclic descent and includes statistical significance testing. The proposed method is very easy to use. Furthermore, it does not require full understanding of time series theory, nor require many inputs from the user. However, it is sufficiently flexible to undertake more complex tasks such as forecasting. Additionally, based on previous knowledge, specific periods can be included or excluded easily. The output results are organized into two groups. One contains the parameters of the adjusted model and their F statistics. The other consists of the harmonic parameters that best fit the original series according to their importance and the summarized statistics of the comparisons between successive models in the cyclic descent process. Periods is tested with both, simulated and actual sunspot and Multivariate ENSO Index data to show its performance and accuracy.

Un análisis de los efectos de la crisis de Banesto sobre la banca y la industria
Víctor Manuel González Méndez,Francisco González Rodríguez
Investigaciones Económicas , 2000,
Abstract:
Procedimientos de resolución de insolvencia financiera en Espa a: Costes de insolvencia y transferencias de riqueza
Víctor Manuel González Méndez,Francisco González Rodríguez
Investigaciones Económicas , 2000,
Abstract:
Hexavalent Chromium Removal by Citrus limonium Shell  [PDF]
Juan Manuel Vargas-Morales, Diana Bautista-Mata, Juan F. Cárdenas-González, Ismael Acosta-Rodríguez, Víctor Manuel Martínez-Juárez
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2012, DOI: 10.4236/ojinm.2012.23003
Abstract: We studied the Chromium(VI) removal capacity in aqueous solution by the lemon shell, using the diphenylcarbazide method to evaluate the metal concentration. So, the highest biosorption of the metal (50 mg/L) occurs within 100 minutes, at pH of 1.0, and 28°C. According to temperature, the highest removal was observed at 60°C, in 11 minutes, when the metal (1 g/L) is completely adsorbed. At the analyzed concentrations of Cr(VI), lemon shell, showed excellent removal capacity, besides it removes efficiently the metal in situ (97.2% removal, 7 days of incubation, 5 g of biomass). After 1 hour of incubation the studied biomass reduces 1.0 g of Cr(VI) with the simultaneous production of Cr(III); so it can be used to eliminate it from industrial wastewater.
Induction of Extracellular Lytic Enzymes by Fusarium solani  [PDF]
María de Guadalupe Moctezuma-Zárate, Juan Manuel Vargas-Morales, Juan F. Cárdenas-González, Víctor Manuel Martínez-Juárez, Ismael Acosta-Rodríguez
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.38A005
Abstract:

Fusarium solani is a necrotrophic parasitic fungus that causes wilt in some plants, causing severe economic losses in some areas of the country. The objective of this work was to analyze the induction of extracellular lytic enzymes produced by a strain of F. solani, isolated from a culture of tomato, in Villa de Arista, S.L.P. México. Polygalacturonase activity has a greater induction time at 10 days, and the xylanase has two times higher activity at 8 and 13 days of incubation at 28?C. Also, the xylanase activities A and B were very stable at 4?C. After 7 days of incubation, it has an activity of 100% and 96%, respectively, while polygalacturonase retains 61% of its initial activity. Both activities are better induced with glutamate and urea as nitrogen sources respectively, and both exhibit an initial pH optimum of 5.5. Finally, we didnt find cellulase activity in the analyzing conditions.

Análisis transcripcional de la región genética RvD1 de Mycobacterium bovis Transcriptional analysis of genetic region RvD1 of Mycobacterium bovis
Tibatá R. Víctor Manuel,González Clara Eugenia,Rodríguez Juan Germán,del Portillo Patricia
Revista Colombiana de Biotecnología , 2004,
Abstract: Mycobacterium bovis comparte una identidad del 99,9% con los genomas de M. tuberculosis, M. africanum y M. microti. Dentro del 0,1% de esta diferencia se encuentran dos regiones genéticas propias de M. bovis: RvD1 y RvD2, las cuales se encuentran delecionadas del genoma de M. tuberculosis H37Rv y, según el análisis bioin-formático, contienen probables marcos abiertos de lectura (Open Reading Frames: ORF). Con el fin de deter-minar si la región RvD1, transcribe los ORF predichos por bioinformática: ORF1, ORF2 y Rv2024, se extrajeron muestras de ARN total de M. bovis BCG Pasteur, en diferentes puntos de una curva de crecimiento micobacteriano, las cuales fueron analizadas mediante la técnica de Transcripción Reversa y Reacción en Ca-dena de la Polimerasa (RTq-PCR) en tiempo real. Los hallazgos obtenidos en esta cinética de transcripción por RTq-PCR en tiempo real demostraron que los probables marcos de lectura abiertos ORF1, ORF2 y Rv2024 de la región RvD1 de M. bovis, sí se transcriben y lo hacen de manera constitutiva, hecho que no había sido repor-tado. Los resultados de esta investigación sirven como un primer paso para determinar la función que desem-pe a la región RvD1 de M. bovis, y su posible papel en la patogénesis y en la interacción huésped-patógeno de la tuberculosis bovina y humana. Palabras clave: Mycobacterium bovis, BCG, RNA, RT-PCR, RvD1. Mycobacterium bovis, shares 99.9% of genomic identity with M. tuberculosis, M. africanum and M. microti. Within this 0.1 % of difference, there are two genetic regions characteristics of M. bovis that are deleted in M. tuberculo-sis H37Rv: RvD1 and RvD2. According to bioinformatic analysis, these regions contain Open Reading Frames (ORFs). With the purpose of determining if the RvD1 region transcribes the ORFs predicted by bioinformatics (ORF1, ORF2 and Rv2024); total RNA was extracted from a culture of M. bovis BCG Pasteur, at different time points along the growth curve. The RNA samples were analyzed by Real Time Reverse Transcription - Poly-merase Chain Reaction (RTq-PCR). The findings show that ORF1, ORF2 and Rv2024, were transcribed consti-tutively, something that has not been reported previously. These results are a first step in order to determine the function of M. bovis RvD1 region, its possible role in pathogenesis and its interaction with both cattle and humans. Key words: Mycobacterium bovis, BCG, RNA, Real Time, RT-PCR, RvD1
Desarrollo de un modelo de aterosclerosis inducida por inmunocomplejos de forma activa en ratones BALB/CBJ
Liudmila López Matilla,Lien López Matilla,Antonio González Griego,Víctor Manuel Rodríguez Sosa
Revista Cubana de Investigaciones Biom??dicas , 2002,
Abstract: Se emplearon ratones isogénicos de la línea BALB/CBJ, de 6 semanas de edad y un régimen de agua y comida ad libitum. Estos se dividieron en 2 grupos, a uno de ellos se les realizó el esquema de inmunización de 0-1-4 semanas por vía intraperitoneal con la vacuna cubana anti hepatitis. El otro grupo fue el control y se inmunizó de la misma forma empleando el excipiente de la vacuna, sin el antígeno de superficie de la hepatitis B (AgsHB). El grupo tratado inhaló diariamente durante 1 mes humo de cigarillo. Después de cuantificar los Ac anti-HBs y la ausencia de estos en los controles, se llevaron a cabo 7 inmunizaciones con un intervalo de 5 d entre ellas por la vena caudal, se utilizó como inmunógeno en el grupo tratado AgsHB recombinante con una dosis que duplicó la concentración de anti-HBs de cada animal. Al grupo control se le suministró solución salina con la misma metodología que en el grupo tratado. Se determinó la presencia de inmunocomplejos circulantes en plasma. Se practicó eutanasia y se comprobó la presencia de lesiones ateroscleróticas de forma macroscópica y microscópica. Con los resultados obtenidos se concluyó que se logró obtener un modelo de aterosclerosis en ratones isogénicos BALB/CBJ por formación de inmunocomplejos de manera activa. 6-week-old BALB/CBJ isogenic mice were used in this study and an ad libitum regime of water and food was established. These mice were divided into 2 groups.One of them was applied the immunization scheme of 0-1-4 weeks with the Cuban anti-hepatitis vaccine by intraperitoneal route. The control group was immunized by the same way, using the excipient of the vaccine without the hepatitis B surface antigen (AgsHB). The treated group inhaled cigarrete smoke daily during a month. After quantifying the anti-hepatitis B antibodies and proving their absence in the controls, 7 immunizations were performed with an interval of 5 days between them by the caudal vein. Recombinant AgsHB was used as an immunogen in the treated group at a dose that dobled the concentration of anti-hepatitis-B antibodies of every animal. The control group was adminstered a saline solution with the same methodology than the treated group. It was determined the presence of circulating immunocomplexes in plasma. Euthanasia was practiced and the presence of atherosclerotic injuries was proved in a macroscopic and microscopic way. According to the results obtained, it was concluded that it was possible to obtain a model of atherosclerosis in BALB/CBJ isogenic mice by the formation of immunocomplexes in an active way.
Caracterización fenotípica y molecular de cepas de Pasteurella multocida aisladas de exudado nasal de bovinos, en dos cuencas lecheras de México
Víctor Manuel Campuzano Ocampo,Alma Delia González Rodríguez,Rigoberto Hernández Castro,Francisco Suárez Güemes
Veterinaria México , 2011,
Abstract: Se obtuvieron 250 cepas de P. multocida aisladas de exudado nasal, 182 cepas de bovinos clínicamente sanos y 68 cepas de bovinos clínicamente enfermos de neumonía, de dos complejos lecheros, uno en la región de Tizayuca estado de Hidalgo (n = 81), y otro en la Región Lagunera de los estados de Coahuila y Durango (n = 169), México. Las cepas fueron identificadas mediante pruebas bioquímicas convencionales y el sistema comercial API 20NE. La tipificación capsular se realizó por medio de las pruebas de hiauloronidasa y acriflavina, así como por medio de una PCR múltiple para la amplificación de los genes hyaD-hyaC y dcbF. Los resultados globales mediante la prueba de hialuronidasa mostraron que 90.4% (226/250) de las cepas fueron del tipo capsular A y por medio de la prueba de acriflavina, 9.6% (24/250) fue del tipo capsular D. Por medio de la PCR múltiple, 92% (230/250) fue tipo capsular A y 8% (20/250) fue tipo capsular D. La comparación de los resultados entre las pruebas bioquímicas y la técnica de PCR concuerdan en la identificación de las cepas del tipo capsular A, pero no así con las del tipo capsular D. Se corrobora que en México el tipo capsular predominante de P. multocida es el A.
ESTRATEGIA DEL RENDIMENTO DE LA CALDAD COMO FACTOR COMPETITIVO EN EDUCACIóN A DISTANCIA Y EDUCACIóN SUPERIOR EN EDUCCIóN UNIVERSITARIA
Claudio Rafael Vásquez Martínez.,Víctor Manuel González Romero,,María Morfin Otero,María Candelaria Rodríguez Pérez
El Agora USB , 2009,
Abstract: Se ve, a lo largo de la evaluación como algunos criterios de rendimiento académico, considerados como los más avanzados en el proceso de aprendizaje, indicadores por lo mismo de mayor cualificación, presentan logros inferiores por parte de los estudiantes de EDI (Educación a Distancia). Esto no es gratuito y tiene origen en la orientación pedagógica de la educación primaria y secundaria preocupada más por informar y desarrollar destrezas elementales, que por generar en sus alumnos capacidades de observación, análisis, síntesis y desarrollo del pensamiento divergente, de conciencia social y de capacidad de liderazgo para orientar el proceso de cambio social.
Birding for and with People: Integrating Local Participation in Avian Monitoring Programs within High Biodiversity Areas in Southern Mexico
Rubén Ortega-álvarez,Luis Antonio Sánchez-González,Vicente Rodríguez-Contreras,Víctor Manuel Vargas-Canales,Fernando Puebla-Olivares,Humberto Berlanga
Sustainability , 2012, DOI: 10.3390/su4091984
Abstract: Biological monitoring is a powerful tool for understanding ecological patterns and processes, implementing sound management practices, and determining wildlife conservation strategies. In Mexico, regional long-term bird monitoring has been undertaken only over the last decade. Two comprehensive programs have incorporated bird monitoring as the main tool for assessing the impact of human productive activities on birds and habitats at local and regional levels: the Integrated Ecosystem Management (IEM) and the Mesoamerican Biological Corridor Mexico (CBMM). These programs are implemented in supremely important biodiverse regions in the southern and southeastern states of Mexico. Bird monitoring activities are based on the recruitment and participation of local people linked to sustainable productive projects promoted by the CBMM or IEM. Through a series of training workshops delivered by specialists, local monitors receive equipment and coordinate to become part of a large monitoring network that facilitates regional covertures. This data currently being obtained by local people will enable the mid- and long-term assessment of the impacts of sustainable human productive activities on birds and biodiversity. Community-based bird monitoring programs are a promising opportunity for enhancing scientific knowledge, improving sustainable practices, and supporting wildlife conservation in areas of high biodiversity.
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