Results 31 to 40 of about 44,373 (218)

La contaminación ambiental ocasionada por la minería en la provincia de El Oro

Estudios de la Gestión: revista internacional de administración, 2020
The environmental pollution caused by mining in the Province of El Oro has brought se-rious and irreparable consequences to the environment. Mining has been there for a long time, causing a great damage by its activities in the cantons located in the ...
provincia de El Oro, provincia de El Oro, Wilson Vilela-Pincay, A. Bravo-González   +3 more
semanticscholar   +1 more source

Used of pesticides in cottonseed cultivars. Present trends.

Grasas y Aceites, 1997
The paper reviews the world production of cotton and the use of pesticides in its growth. The risks derived from their abuse, especially chlorinated ones, are commented.
M. J. Martínez, M. Crespi
doaj   +1 more source

Extraction by SOXTEC® of the cotton fatty matter from different producing areas. Comparison of the dichloromethane or successive dichloromethane-methanol extractions.

Grasas y Aceites, 1997
The paper compares the fatty matter recovered from cotton when applying one extraction with dichloromethane or two successive extractions (the first with dichloromethane and the second one with methanol, more polar) and the time required for the ...
Mª J. Martínez, M. Crespi
doaj   +1 more source

EVALUACIÓN DEL IMPACTO DE LA CONTAMINACIÓN LUMÍNICA SOBRE LAS AVES MARINAS EN CHILE: DIAGNÓSTICO Y PROPUESTAS

Ornitologia Neotropical, 2020
La contaminación lumínica afecta a las aves marinas por la atracción hacia fuentes de luz y su posterior caída (fallout) en todo el mundo, siendo los petreles y fardelas las especies más afectadas.
Rodrigo Silva, F. Medrano, Ivonne Tejeda, D. Terán, Ronny Peredo, Rodrigo C. Barros, Valentina Colodro, P. González, Verónica Gónzalez, C. Guerra-Correa, Peter Hodum, B. Keitt, Guillermo Luna-Jorquera, Vinko Malinarich, Gabriela Mallea, P. Manríquez, H. Nevins, B. Olmedo, Jorge Páez-Godoy, Guillermo de Rodt, F. Rojas, P. Sanhueza, C. G. Suazo, Frederick Toro, Bárbara Toro-Barros   +24 more
semanticscholar   +1 more source

Indicadores bacteriológicos de contaminación fecal en los ríos de Cuenca, Ecuador

MASKANA, 2020
Ante la necesidad de un control fiable de la condición microbiológica del agua es imprescindible la selección de indicadores de contaminación fecal sensibles a cambios en la calidad.
Guillermina Pauta-Calle, G. Vazquez, Andrea Abril, Carlos Torres, Miriam Loja-Sari, Andrea Palta-Vera   +5 more
semanticscholar   +1 more source

Contaminación del agua por metales pesados, métodos de análisis y tecnologías de remoción. Una revisión

, 2020
Current industrial production systems nowadays use heavy metals for the extraction of a material or as an element in the refining of a particular product which in principle results in obtaining the desired product with relatively low production cost ...
Santiago Eduardo Pabón Guerrero, Ricardo Benítez Benítez, Rodrigo Andrés Sarria Villa, José Antonio Gallo Corredor   +3 more
semanticscholar   +1 more source

Evaluating protected areas’ coverage of threats to terrestrial biodiversity

Conservation Biology, EarlyView.
Abstract Protected areas (PAs) are vital for biodiversity conservation and have expanded globally. However, increasing pressures on biodiversity make it difficult to achieve conservation goals. Using threat probability maps based on the International Union for Conservation of Nature Red List and the World Database of Protected Areas, we analyzed the ...
Katherine Pulido‐Chadid, Carsten Rahbek, Jonas Geldmann   +2 more
wiley   +1 more source

Spatiotemporal Variations in Chemical Composition of Wet Atmospheric Deposition in Mexico City

Aerosol and Air Quality Research, 2023
A comprehensive analysis of the chemical composition of wet atmospheric deposition was performed on 7048 samples collected between 2003 and 2021 over Mexico City. The descending ion abundance trend was NH4+ > SO42− > NO3− > Ca2+ > Cl− > H+ > Mg2+ > Na+ >
Elizabeth Vega, Ann Wellens, Ana Luisa Alarcón, Rodolfo Sosa, Monica Solano, Monica Jaimes-Palomera   +5 more
doaj   +1 more source

A multiscale seasonal examination of the risk of harm to seabirds from vessels based on co‐occurrence in Alaskan waters

Conservation Biology, EarlyView.
Abstract Alaska's seascape supports globally significant seabird populations, including vulnerable and threatened species, and hosts economically important commercial fisheries and marine transportation corridors. Seasonal patterns of seabird movements and vessel traffic create a complex landscape of risk, defined as high levels of co‐occurrence ...
Kelly Kapsar, Benjamin K. Sullender, Katherine J. Kuletz   +2 more
wiley   +1 more source

Contribution of microcosm experiments to conservation science

Conservation Biology, EarlyView.
Abstract Microcosms, or miniature experimental systems, have been used to develop models and theories in ecology. However, their contribution to conservation science is unclear. We explored the application, design, and impact of microcosms in conservation science from 469 systematically identified articles published from 1986 to 2023.
Eleanor R. Stern, Peter A. Vesk, Chris C. Clements, Michael A. McCarthy   +3 more
wiley   +1 more source