736 resultados para Caña de azúcar


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El presente es un trabajo de aplicación de la teledetección con el apoyo de la cartografía topográfica y de las fotografías aéreas para el levantamiento del uso del suelo en la zona cafetalera norte de la ciudad de Alajuela, Costa Rica.  La zona de estudio está situada en el Valle Central de Costa Rica.  Se trata de una zona agrícola destinada al cultivo del café, de la caña de azúcar, de pastos extensivos e intensivos y a la horticultura.  Las partes altas de montañas y cañones de ríos son cubiertas por el bosque natural.  Esta zona ha experimentado una transformación reciente de la utilización del suelo.  En efecto, los cultivos de exportación (flores y plantas ornamentales) hacen su aparición de manera violenta.  El objetivo de este trabajo es producir un mapa de uso del tierra aplicando métodos de investigación tradicionales y modernos de la Geografía, donde la teledetección juega un rol muy importante en la puesta al día de la información cartográfica.  Finalmente, está técnica espacial unida a la información extraída de los mapas topográficos, de las fotografías aéreas y del trabajo de campo, ha permitido generar dicha imagen- mapa del uso de la tierra. 

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Este artículo presenta la dinámica y articulación de las actividades agrícolas del cantón de Poás.Considera además los rasgos sobresalientes de dichas actividades a saber: café, caña de azúcar, fresas, plantas ornamentales, ganadería de leche y hortalizas. Asimismo, relaciona la dinámica de inserción de la población en este sector productivo, justificando las actividades agrícolas como relevantes en el desarrollo económico del cantón. La caracterización efectuada permitió identificar las tendencias de los sistemas agrícolas tradicionales, no tradicionales y las actividades agrícolas emergentes. La metodología involucra la revisión de datos secundarios de diversas fuentes, estadísticas y censales, enriquecidas con levantamiento de campo, visitas y entrevistas de campo a  productores. Este trabajo se enmarca dentro del plan regulador del cantón de Poás, realizado por la Escuela de Ciencias Geográficas de la Universidad Nacional. ABSTRACT This article presents the dynamics and articulation of agricultural activities in the canton of Poás. Also considered are the salient features of such activities, namely, coffee, sugar cane, strawberries, rnamental plants, dairy and vegetables. At the same time, the article relates the dynamics of inclusion of the population in the productive sector, justifying agricultural activities as relevant to the economic  evelopment of the canton. This characterization made it possible to identify trends in traditional farming systems as well as non-traditional and emerging agricultural activities. The methodology involves a review of secondary data from various sources, statistics and census, supplemented with field surveys, field visits and interviews about producer experiences. This work is part of the Poás regulatory plan onducted by the School of Geographical Sciences at Universidad Nacional, Costa Rica.

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The nucleotide sequence of a 714 bp BamHI-EcoRI fragment of cucumber chloroplast DNA was determined. The fragment contained a gene for tRNA(Leu) together with its flanking regions. The trnL(CAA) gene sequence is about 99% in similarity to broad bean, cauliflower, maize, spinach and tobacco corresponding genes. The relative expression level of the gene was determined by Northern (tRNA) gel blot and Northern (total cellular RNA) slot-blot analyses using the trnL gene probe in 6-day old etiolated cucumber seedlings and the seedlings that had been kept in the dark (dark-grown), treated with benzyladenine (BA) and kept in the dark (BA-treated dark-grown), illuminated (light-grown), and treated with BA and illuminated (BA-treated light-grown), for additional 4, 8 or 12 hr. The trnL transcripts and tRNA(Leu) levels in BA-treated dark-grown seedlings were 5 and 3 times higher, respectively after 4 hr BA treatment, while in the BA treated light-grown seedlings the level of trnL transcripts was only 3 times higher and had no detectable effect on mature tRNA(Leu) when compared to the time-4 hr dark-grown seedlings. However, the level of mature tRNA(Leu) did not show marked changes in the light-grown seedlings, whereas the level of trnL transcripts increases 3 times after 8 hr illumination of dark-grown seedlings. These data indicate that both light and cytokinin can signal changes in plastid tRNA gene expression. The possible regulatory mechanisms for such changes are discussed.

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The nucleotide sequence of a 714 bp BamHI-EcoRI fragment of cucumber chloroplast DNA was determined. The fragment contained a gene for tRNA(Leu) together with its flanking regions. The trnL(CAA) gene sequence is about 99% in similarity to broad bean, cauliflower, maize, spinach and tobacco corresponding genes. The relative expression level of the gene was determined by Northern (tRNA) gel blot and Northern (total cellular RNA) slot-blot analyses using the trnL gene probe in 6-day old etiolated cucumber seedlings and the seedlings that had been kept in the dark (dark-grown), treated with benzyladenine (BA) and kept in the dark (BA-treated dark-grown), illuminated (light-grown), and treated with BA and illuminated (BA- treated light-grown), for additional 4, 8 or 12 hr. The trnL transcripts and tRNA(Leu) levels in BA-treated dark-grown seedlings were 5 and 3 times higher, respectively after 4 hr BA treatment, while in the BA treated light-grown seedlings the level of trnL transcripts was only 3 times higher and had not detectable effect on mature tRNA(Leu) when compared to the time-4 hr dark-grown seedlings. However, the level of mature tRNA(Leu) did not show marked changes in the light-grown seedlings, whereas the level of trnL transcripts increases 3 times after 8 hr illumination of dark-grown seedlings. These date indicate that both light and cytokinin can signal changes in plastid tRNA gene expression. The possible regulatory mechanisms for such changes are discussed.

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[ES] El aumento del consumo de grasas y carbohidratos, así como dulces, refrescos, productos industriales y snacks, junto con la disminución de la ingesta de alimentos saludables, y el sedentarismo en los niños, infl uyen en su salud. Hay que prestar especial atención a alimentos que forman parte del estilo de vida actual: “snack”, dulces, bollería o picoteo entre comidas por sus importantes repercusiones.

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This report concerns the development of the AASK V4.0 database (CAA Project 560/SRG/R+AD). AASK is the Aircraft Accident Statistics and Knowledge database, which is a repository of survivor accounts from aviation accidents. Its main purpose is to store observational and anecdotal data from interviews of the occupants involved in aircraft accidents. The AASK database has wide application to aviation safety analysis, being a source of factual data regarding the evacuation process. It is also key to the development of aircraft evacuation models such as airEXODUS, where insight into how people actually behave during evacuation from survivable aircraft crashes is required. With support from the UK CAA (Project 277/SRG/R&AD), AASK V3.0 was developed. This was an on-line prototype system available over the internet to selected users and included a significantly increased number of passenger accounts compared with earlier versions, the introduction of cabin crew accounts, the introduction of fatality information and improved functionality through the seat plan viewer utility. The most recently completed AASK project (Project 560/SRG/R+AD) involved four main components: a) analysis of the data collected in V3.0; b) continued collection and entry of data into AASK; c) maintenance and functional development of the AASK database; and d) user feedback survey. All four components have been pursued and completed in this two-year project. The current version developed in the last year of the project is referred to as AASK V4.0. This report provides summaries of the work done and the results obtained in relation to the project deliverables.

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Dissertação de Mestrado em Gestão e Conservação da Natureza.

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Este documento contiene el plan de emprendimiento de Pizca de Azúcar, empresa que se dedicará a prestar un servicio de entretenimiento por medio de Clases de Cocina, dando la opción a los consumidores de escoger tanto el menú como el lugar. La empresa cuenta con 4 productos que se dividen en clases a domicilio para grupos o individual y clases en la sede para grupos o individual.