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Search Results: 1 - 10 of 857 matches for " Betancourt "
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Microbiota and Mycotoxins in Trilinear Hybrid Maize Produced in Natural Environments at Central Region in Mexico  [PDF]
Pe?a Betancourt, Silvia Denise
Advances in Microbiology (AiM) , 2016, DOI: 10.4236/aim.2016.69066
Abstract: Mycotoxigenic fungi and mycotoxins in 3 inbred lines (hybrids resistant to corn ear rot) were identified in twenty samples. The maize (Zea mays) accessions were collected in five plots of two municipalities in High Valley, state of Hidalgo. The fungal population was determined with a microbiological dilution method used two culture media (PDA and ELA), for the detection of mycotoxins with thin layer chromatography with visual inspection in UV light and a direct competitive enzyme-linked immunosorbent (ELISA). The results showed high moisture content in all hybrids evaluated on an average of 38.3% and a 1.8 × 103 UFC/g fungus, values within the permitted limits by the Mexican legislation; however the most prevalent fungi were Fusarium sp. (76%), Alternaria sp. (14%), Penicillium sp. (4%) and Aspergillus sp. (5%), and the species Aspergillus nidulas, Aspergillus flavus, Fusarium verticillioides, Fusarium poae, and Penicillium ochraceum. The aflatoxin concentration was observed in a range from 2 to 13 ng/g and 370 to 660 ng/g to fumonisins. It is concluded that trilinear corn hybrids have a variety of pathogenic potential fungi. The two genetic hybrids showed levels of aflatoxins and fumonisin safe for human consumption, contrary to one hybrid, with a content not suitable for human consumption. A better understanding of genetic hybrids corn will improve predictive mycotoxin contamination.
Magnetization Dynamics of Amorphous Ribbons and Wires Studied by Inductance Spectroscopy
Israel Betancourt
Materials , 2011, DOI: 10.3390/ma4010037
Abstract: Inductance spectroscopy is a particular formulation variant of the well known complex impedance formalism typically used for the electric characterization of dielectric, ferroelectric, and piezoelectric materials. It has been successfully exploited as a versatile tool for characterization of the magnetization dynamics in amorphous ribbons and wires by means of simple experiments involving coils for sample holding and impedance analyzer equipment. This technique affords the resolution of the magnetization processes in soft magnetic materials, in terms of reversible deformation of pinned domain walls, domain wall displacements and spin rotation, for which characteristic parameters such as the alloy initial permeability and the relaxation frequencies, indicating the dispersion of each process, can be defined. Additionally, these parameters can be correlated with chemical composition variation, size effects and induced anisotropies, leading to a more physical insight for the understanding of the frequency dependent magnetic response of amorphous alloys, which is of prime interest for the development of novel applications in the field of telecommunication and sensing technologies. In this work, a brief overview, together with recent progress on the magnetization dynamics of amorphous ribbons, wires, microwires and biphase wires, is presented and discussed for the intermediate frequency interval between 10 Hz and 13 MHz.
Health & Life: A tribute to the late Edmundo Granda Ugalde
Zaida Betancourt
Social Medicine , 2009,
Abstract: At the initiative of several Ecuadorian organizations – the National Council of Health (CONASA), the University of Cuenca, the National University of Loja, and the National Council of Higher Education (CONESUP) – and with the collaboration of both the Pan-American Health Organization (PAHO) and the Latin American Social Medicine Association Social (ALAMES), we are publishing the selected writings of Edmundo Granda as well as a volume of tributes.
Edmundo Granda: Health and Life. Volume 2
Zaida Betancourt
Social Medicine , 2009,
Rese a de "De la brigada secundaria al cordón cerrillos" de Guillermo Rodríguez
Renard Betancourt
Polis : Revista de la Universidad Bolivariana , 2008,
Uso de las fuentes universales del derecho internacional del trabajo como guía para la interpretación del derecho interno: comentario a la sentencia de la Corte Constitucional C-695 de 2008
David Betancourt
Revista Derecho del Estado , 2009,
Early Neutrino Data in the NO$ν$A Near Detector Prototype
M. Betancourt
Physics , 2011,
Abstract: NOvA is a long-baseline neutrino experiment using an off-axis neutrino beam produced by the NuMI neutrino beam at Fermilab. The NOvA experiment will study neutrino $\nu_{\mu}\rightarrow\nu_{e}$ oscillations. A short term goal for the NOvA experiment is to develop a good understanding of the response of the detector. These studies are being carried out with the full Near Detector installed on the surface (NDOS) at Fermilab. This detector is currently running and will acquire neutrino data for a year. Using beam muon neutrino data, quasi-elastic charged-current interactions will be studied. Status of the NDOS running and early data will be shown.
A Unified Treatment of Predictive Model Comparison
Michael Betancourt
Statistics , 2015,
Abstract: The predictive performance of any inferential model is critical to its practical success, but quantifying predictive performance is a subtle statistical problem. In this paper I show how the natural structure of any inferential problem defines a canonical measure of relative predictive performance and then demonstrate how approximations of this measure yield many of the model comparison techniques popular in statistics and machine learning.
Limitación del esfuerzo terapéutico versus eutanasia: una reflexión bioética
Betancourt Betancourt,Gilberto de Jesús;
Humanidades M??dicas , 2011,
Abstract: the practice of limiting life-sustaining medical treatment is nothing new at intensive care units. euthanasia should be distinguished from limiting life-sustaining medical treatments, which is considered as a good practice. this paper presents a theoretical reflection based on a bioethical analysis of the main differences between both of them.
Limitación del esfuerzo terapéutico como movimiento de signo positivo y sus problemas actuales
Betancourt Betancourt,Gilberto de Jesús;
Humanidades M??dicas , 2011,
Abstract: the therapeutic effort limitation is considered by health professionals as a good clinical practice at both intensive and emergency care units. resulting from circumstances that favored its materialization in modern world, it currently presents serious problems, not only in cuba, but in other countries as well. such problem demand prompt solutions. this paper critically analyzes the emergence and historical development, as a positive sign move, of this medical practice, up to its current state.
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