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4 resultados encontrados para: AUTOR: Álvarez Buylla Roces, Elena R.
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1.
- Artículo de divulgación
Miel y transgénicos, ¿la imposible coexistencia?
Vandame, Rémy (autor) ; Álvarez Buylla Roces, María Elena (autora) ;
Disponible en línea
Contenido en: La Jornada Año 28, no. 10002 (Martes 12 de junio de 2012), p. 339-345
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Resumen en: Inglés |
Resumen en inglés

A possible consequence of planting genetically modified organisms (GMOs) in centres of crop origin is unintended gene flow into traditional landraces. In 2001, a study reported the presence of the transgenic 35S promoter in maize landraces sampled in 2000 from the Sierra Juarez of Oaxaca, Mexico. Analysis of a large sample taken from the same region in 2003 and 2004 could not confirm the existence of transgenes, thereby casting doubt on the earlier results. These two studies were based on different sampling and analytical procedures and are thus hard to compare. Here, we present new molecular data for this region that confirm the presence of transgenes in three of 23 localities sampled in 2001. Transgene sequences were not detected in samples taken in 2002 from nine localities, while directed samples taken in 2004 from two of the positive 2001 localities were again found to contain transgenic sequences. These findings suggest the persistence or re-introduction of transgenes up until 2004 in this area. We address variability in recombinant sequence detection by analyzing the consistency of current molecular assays. We also present theoretical results on the limitations of estimating the probability of transgene detection in samples taken from landraces. The inclusion of a limited number of female gametes and, more importantly, aggregated transgene distributions may significantly lower detection probabilities. Our analytical and sampling considerations help explain discrepancies among different detection efforts, including the one presented here, and provide considerations for the establishment of monitoring protocols to detect the presence of transgenes among structured populations of landraces.


4.
Tesis - Doctorado
Desarrollo y evaluación de un modelo dinámico espacial del crecimiento de cultivos asociados / Luis Enrique García Barrios
García Barrios, Luis Enrique ; Franco Baqueiro, Miguel (tutor) ; Álvarez Buylla Roces, Elena R. (asesora) ; Ezcurra Real de Azua, Exequiel (asesor) ; Vandermeer, John (asesor) ;
México : Universidad Nacional Autónoma de México, Instituto de Ecología, Unidad Académica de los Ciclos Profesionales y de Posgrado , 1998
Clasificación: TE/631.58 / G3
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010016270 (Disponible) , ECO010016269 (Disponible)
Disponibles para prestamo: 2