4 research outputs found

    Análisis de la movilidad de pesticidas en los suelos de la región centro-sur del estado de Chihuahua

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    Los pesticidas son ampliamente usados en la producción de alimentos en la región Centro-Sur del Estado de Chihuahua perteneciente al Distrito de Riego 005. La caracterización del destino final y la toxicidad de estos son importantes para evaluar con certeza el riesgo asociado a su uso. Esta investigación se enfocó en el análisis del metabolismo y residuos de los principales insecticidas utilizados para el control de plagas en los cultivos de mayor importancia en esta región, tomando en cuenta los tipos de suelos para determinar su posible migración a los cuerpos de agua o su permanencia en el terreno lo cual permite comprender el problema de la contaminación por pesticidas en esta región y así contribuir al uso y manejo adecuado de estos. Los resultados muestran que los principales pesticidas usados en este Distrito son esencialmente organofosforados de los cuales en su mayoría son considerados muy tóxicos y el resto tóxicos y nocivos. Así mismo, el análisis muestra que muchos de estos no son persistentes en el ambiente. Sin embargo, su uso intensivo es lo que puede ocasionar peligros ambientales a corto y largo plazo. Las interacciones entre los plaguicidas aplicados y el ambiente, dependen fundamentalmente de las propiedades de los plaguicidas así como de los factores ambientales, por lo cual es importante que los productores consideren el tipo de plaguicida a aplicar, características del suelo, la dosis recomendada y tener en cuenta que las buenas prácticas de manejo de estos puede reducir el riesgo de contaminación en la región

    The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 Data

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    This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal of surveying over 10,000 nearby galaxies. The complete release of the MaNGA Stellar Library (MaStar) accompanies this data, providing observations of almost 30,000 stars through the MaNGA instrument during bright time. DR17 also contains the complete release of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) survey which publicly releases infra-red spectra of over 650,000 stars. The main sample from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), as well as the sub-survey Time Domain Spectroscopic Survey (TDSS) data were fully released in DR16. New single-fiber optical spectroscopy released in DR17 is from the SPectroscipic IDentification of ERosita Survey (SPIDERS) sub-survey and the eBOSS-RM program. Along with the primary data sets, DR17 includes 25 new or updated Value Added Catalogs (VACs). This paper concludes the release of SDSS-IV survey data. SDSS continues into its fifth phase with observations already underway for the Milky Way Mapper (MWM), Local Volume Mapper (LVM) and Black Hole Mapper (BHM) surveys

    Temporal patterns of active fire density and its relationship with a satellite fuel greenness index by vegetation type and region in Mexico during 2003–2014

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    The Seventeenth Data Release of the Sloan Digital Sky Surveys:complete release of MaNGA, MaStar and APOGEE-2 data

    No full text
    This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal of surveying over 10,000 nearby galaxies. The complete release of the MaNGA Stellar Library accompanies this data, providing observations of almost 30,000 stars through the MaNGA instrument during bright time. DR17 also contains the complete release of the Apache Point Observatory Galactic Evolution Experiment 2 survey that publicly releases infrared spectra of over 650,000 stars. The main sample from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), as well as the subsurvey Time Domain Spectroscopic Survey data were fully released in DR16. New single-fiber optical spectroscopy released in DR17 is from the SPectroscipic IDentification of ERosita Survey subsurvey and the eBOSS-RM program. Along with the primary data sets, DR17 includes 25 new or updated value-added catalogs. This paper concludes the release of SDSS-IV survey data. SDSS continues into its fifth phase with observations already underway for the Milky Way Mapper, Local Volume Mapper, and Black Hole Mapper surveys
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