Se presentan los resultados de un proyecto etnobotánico que pretende rescatar el conocimiento vegetal y la etnomedicina entre los indígenas Warao de la Isla de Araguabisi y de Tucupita en el estado Delta Amacuro. El trabajo de campo se realizó…

Los vegetales han acompañado e influenciado estrechamente la historia del hombre. Por su gran diversidad de usos y funciones en la cotidianidad, se plantea que en gran medida su presencia ha sido vital y determinante para el desarrollo e la…

The science of histology endeavours to achieve a knowledge of the detailed morphology of normal tissues. It is also concerned with relating the structure and function of biological (morphological) units at the microscopic level to their internal and external environments.

The most complete accounts of Lepidoperon embryology are by Toyama (1902), Eastham. (1927), Johannsen (1929), Gross and Howland (1940), Rempel (1951) and Presser and Rutschky (1957). There are many other papers that either deal with the development of only one…

The expanding use of wood pulp and pulp products has emphasized the need for increased basic knowledge dealing with the waste materials and by-products of the forest industries. Wood bark is one or the major byproducts. In the paper industry…

The biological significance of certain pyridinium betaines, such as diphosphopyridine nucleotide and triphosphopyridine nucleotide, has been fully recognized. The vital importance of these substances in the life of organisms provided an impetus for extensive research in this field, with the…

The regulation of any fishery depends for its direction upon the knowledge of the biology of the fish involved. As the haddock has been one of the more important marine food fishes even before marine biological investigation was initiated in…

The use of P32 in biological investigation has contributed greatly to the knowledge of phosphorus metabolism. Soon after this isotope became available in the late 1930’s, many investigators studied the absorption, distribution and excretion of radiophosphorus in plants and animals.…

In sharp contrast to the wealth of chemical knowledge of the nature of the lipids of mycobacteria (Anderson 1940, 1942, Siebert 1950) is the scarcity of facts available to indicate the routes by which fats are metabolized by these organisms.…

The bias in the development of biochemistry to which Baldwin (1940) drew attention in 1937 has not been remedied in the last two decades. Despite the tremendous advances in our knowledge of the biochemistry of mammals and unicellular organisms made…