Esta publicacion describe los conceptos mas importantes en guiar y podar los arboles de manzanas y peras. El objetivo es ayudar aquellas personas que ya tienen experiencia en podar los arboles. Para distinguir la clase y cantidad de cortes que se deben hacer en un arbol o huerta, es necesario...
This study was conducted to investigate the accumulation of dietary polychlorinated biphenyls (PCB's) by a Mt. Shasta strain of rainbow trout (Salmo gairdneri). A commercial mixture of PCB's (Aroclor 1254) was added to the diet at a level of 15 ppm on a dry weight basis. Accumulation of PCB's was...
Published December 1970. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Lead (Pb) and cadmium (Cd) are naturally occurring heavy metals
which have been redistributed to a large extent by man in the environment.
These metals have certain common toxic sites of action on
biological systems of mammals. Simultaneous exposure to Pb and Cd
is highly probable due to common sources...
This analysis of Colombia's System of National Park Reservations
accomplishes four objectives: 1) The historical development of national
parks in Colombia was described; 2) The status, as of August,
1974, of the areas administered by the Colombian Renewable Natural
Resources Development Institute (INDERENA) was summarized; 3) An
analysis of major...