Interciencia articles from January 2007

Interciencia archives from January 2007

What to do with gray literature?/?Que hacer con la literatura gris/O que fazer com a literatura cinza?(EDITORIAL)(Editorial)
January 1, 2007... The amount of gray literature, understood as the accumulation of scientific material that has not been refereed in the traditional way and is not ar the reach of scientists everywhere, is immeasurable. Under the name of gray literature are...

Biomarkers of chemical pollution in microbial communities/ Biomarcadores de contaminacion quimica en comunidades microbianas/ Biomarcadores de contaminacao quimica em comunidades microbianas.
January 1, 2007... SUMMARY The effects of toxic substances on an ecosystem begin with a biochemical reaction in the individual. The initial reactions start at the lowest levels of biological organization, ire highly specific and reversible. Subsequently,...

"Seed money" and publication output in Mexican research: a case study of IFS grantees/Fondos para la iniciacion a la investigacion y produccion cientifica mexicana: estudio de caso de los becarios de la IFS/Fundos de capital semente e produtivadade na ciencia mexicana: estudo de caso dos beneficiarios de fundos do IFS.
January 1, 2007... SUMMARY This study assesses the effect of grants given to young Mexican researchers by the International Foundation for Science (IFS) on the development of their academic careers through an analysis of their publication output. Since 1974...

Arbuscular mycorrhizae as an alternative for a sustainable agriculture in tropical areas/Las micorrizas arbusculares como alternativa para una agricultura sustentable en areas tropicales/As micorrizas arbusculares como alternativa para uma agricultura sustentavel em areas tropicais.
January 1, 2007... SUMMARY Arbuscular mycorrhizae (AM) are ecologically mutualistic associations between Glomeromycota Phyllum fungi and the majority of plants, and could be very useful to achieve a sustainable agriculture. Among the benefits obtained are:...

Methane soil-vegetation-atmosphere fluxes in tropical ecosystems/Flujos de metano del sistema suelo-vegetacion-atmosfera en ecosistemas tropicales/fluxos de metano do sistema solo-vegetacao-atmosfera em ecossistemas tropicais.
January 1, 2007... SUMMARY Recently, a surprising discovery indicated that, by an unknown process, vegetation emits methane to the atmosphere. This finding could have serious implications in atmospheric chemistry, climate, and mitigation of global change. In...

Conductividad hidraulica y grosor de los vasos del xilema en cinco materiales de vid sometidos a deficit hidrico.(REPORTS/COMUNICACIONES/COMUNICACOES)
January 1, 2007... SUMMARY Drought tolerance in plants is partially conditioned by factors related to the resistance to water transport through the xylem tissue. The purpose of this experiment was to assess the changes in hydraulic conductivity of the...

Comparacion de metodos de estimacion de parametros de crecimento del camaron blanco Litopenaeus schmitti en el occidente de Venezuela.(REPORTS/COMUNICACIONES/COMUNICACOES)
January 1, 2007... SUMMARY Different estimates of growth parameters for the white shrimp Litopenaeus schmitti have been reported for Western Venezuela. The differences have been attributed to the different methods and data bases employed. In order to...

Caracterizacion y evaluacion de virulencia en aislamientos de Rhizoctonia solani Kuhn, causante de la mancha bandeada en maiz.(REPORTS/COMUNICACIONES/COMUNICACOES)
January 1, 2007... SUMMARY In Venezuela, banded leaf spot caused by Rhizoctonia solani Kuhn is a widely distributed disease in the most important maize growing areas, causing important yield losses. In 2004, experiments were conducted with the purpose of...

Heridas y parasitos en cocodrilos del Orinoco (Crocodylus intermedius) en un rio altamente impactado por actividades humanas.(REPORTS/COMUNICACIONES/COMUNICACOES)
January 1, 2007... SUMMARY During the last 50 years the Cojedes River System in Venezuela has suffered an important impact from human activities. In juvenile Orinoco crocodiles (n=101) from the most affected river northern sections a lower incidence of...

Examen de la conservación y el aprovechamiento de los recursos vivos.(ESSAYS/ENSAYOS/ENSAIOS)
January 1, 2007... SUMMARY Nowadays, a wide sector of the society talks about conservation affairs. The basic notion that still prevails implies maintaining untouched a natural system indefinitely, with no other purpose than to assure its existence. This...

Forthcoming events/Reuniones venideras/Proximas reunioes.(Calendario)(Ilustración)
January 1, 2007... REUNIONES VENIDERAS / FORTHCOMING EVENTS / PROXIMAS REUNIOES REUNION / EVENT LUGAR / LOCATION FECHA / DATE ENVIRONMENTAL HISTORY Baton Rouge, LA, February 28-March MEETING USA 3,...