Interciencia articles from July 2006

Interciencia archives from July 2006

The ethical dimension in science and technology/ La dimension etica en la ciencia y la tecnologia/ A dimensao etica na ciencia e a tecnologia.(EDITORIAL)(Editorial)
July 1, 2006... For those who carried out their scientific activity in the second half of the 20th century, the equilibrium in the relations between individual, science and society were shaken by very important changes in the ethical consideration of...

[beta]-galactosidases and cell wall dynamics/Las [beta]-galactosidasas y la dinamica de la pared celular/As [beta]-galactosidasas e a dinamica da parede celular.
July 1, 2006... SUMMARY The cell wall is the major determinant of plant cell growth and development. Upon a framework of cellulose, in most flowering plants, there are many cross-linking glycans and pectins whose composition and interactions are involved...

Diversity of freshwater fishes parasitic helminths in two Mexican hydrological basins: helminths and the hypothesis of the betadiverse Mexico/Diversidad de helmintos parasitos de peces dulceacuicolas en dos cuencas hidrologicas de Mexico: los helmintos y la hipotesis del Mexico betadiverso/Diversidade de helmintos parasitas de peixes dulciaquicolas em duas bacias hidrologicas do Mexico: os helmintos e a hipotese do Mexico betadiverso.
July 1, 2006... SUMMARY A diversity analysis of helminth parasites of freshwater fishes in different geographic units from two of the most important Mexican hydrological basins, Rio Lerma and Rio Papaloapan, was undertaken in order to establish the rate...

Medicinal use of wild fauna in Los Altos de Chiapas, Mexico/Uso medicinal de la fauna silvestre en Los Altos de Chiapas, Mexico/Uso medicinal da fauna silvestre nos Altos de Chiapas, Mexico.
July 1, 2006... SUMMARY In countries with a large biological and cultural diversity, like Mexico, there is ample knowledge and utilization of biological resources by different human groups. However, few studies are devoted to medicinal fauna, even though...

Leadership styles and effectiveness: a study of small firms in Chile/Estilos de liberazgo y eficacia: un estudio en pequenas empresas en Chile/Estilos de lideranca e eficcia: um estudo em pequenas empresas no Chile.
July 1, 2006... SUMMARY The purpose of this work is to analyze the relationship between leadership styles and effectiveness in small firms. The work considers a sample of 126 top and medium level managers based in small firms in the north of Chile. The...

Respuestas al deficit hidrico en especies forrajeras de Brachiaria (Trin.) Griseb. (Poaceae).
July 1, 2006... SUMMARY Some Brachiaria species are economically important because they are valuable forages in the Neotropics. In this study the response to soil water stress among five species is compared. When subjected to drought, B. humidicola and B....

Estudio comparativo del valor nutritivo de varios Coleoptera comestibles de Mexico y Pachymerus nucleorum (Fabricius, 1792) (Bruchidae) de Brasil.
July 1, 2006... SUMMARY By means of standardized methods, the nutritive value of some beetle species that are eaten in Mexico and that of Pachymerus nucleorum from Brazil was analyzed and compared. It is concluded that the edible beetles of Mexico and P....

Depredacion de peces sobre el zooplancton en tres embalses neotropicales con distintos estados troficos.
July 1, 2006... SUMMARY The importance of zooplankton in the diet of small size specimens of Astyanax bimaculatus, Moenkhausia pittieri, Roeboides sp., Caquetaia kraussii and Geophagus sp. was evaluated in three Venezuelan reservoirs with two trophic...

Dry matter intake, rumen fermentation and microbial nitrogen supply in Pelibuey sheep fed low-quality rations and different levels of corn oil.
July 1, 2006... SUMMARY Eight Pelibuey hair sheep (45 [+ or -] 2.2kg body weight), cannulated in the rumen and kept in metabolic stalls in a roofed building, were used to determine the effect of the incorporation of com oil in a concentrate upon dry...

Efecto de la interaccion genotipos x practicas de manejo sobre el indice de cosecha de hibridos de maiz bajo riego.
July 1, 2006... SUMMARY Six maize field experiments conducted in Southeastern Mexico in the 1997-99 period were analyzed in order to evaluate genotype x crop management interaction on harvest index (HI). The validity of using a constant value for HI is...

Noventa y cuatro años de la teoria de la deriva Continental de alfred lothar wegener.(ENSAYOS/ESSAYS/ENSAIOS)
July 1, 2006... SUMMARY The theory of continental drift was propounded by Alfred Wegener since 1912. It represents a major advance in the history of science, because it revolutionized the concepts about the terrestrial dynamics. Since it was conceived,...

The inbreeding paradox in invasive species.(ENSAYOS/ESSAYS/ENSAIOS)
July 1, 2006... SUMMARY One of the most relevant topics in the biology of invasion concerns an inbreeding paradox; how do exotic species that usually invade new territories is small numbers, thus suffering the effects of inbreeding, become successful...

Modelos de Metapoblaciones y de la Dinamica Espacio-Temporal de Comunidades.(PUBLICACIONES/PUBLICATIONS/PUBLICACOES)(Reseña de libro)
July 1, 2006... Raventos J, Segarra JG, Acevedo MF (2005). Modelos de Metapoblaciones y de la Dinamica Espacio-temporal de Comunidades. Publicaciones de la Universidad de Alicante, Alicante, España. 284 pp. El estudio de las dinamitas espaciales en...

Forthcoming events/Reuniones venideras/Proximas reunioes.(Calendario)(Ilustración)
July 1, 2006... REUNIONES VENIDERAS / FORTHCOMING EVENTS / PROXIMAS REUNIOES REUNION / EVENT LUGAR / LOCATION FECHA / DATE ICAZ 2006-- Mexico DF, August 23-28, INTERNATIONAL Mexico...