Instrucciones para el poblamiento de una base de datos bibliográfica con la estructura definida por el Sistema Bibliográfico de la CEPAL (SIB

Incluye Bibliografía

Ayuda memoria (3): tabla de selección de campos (FST) del Sistema Bibliográfico de la CEPAL (SIB

Contiene los campos que se invierten para generar el archivo invertido sobre el cual se realizan búsquedas de información.

Ayuda memoria (2): tabla de definición de campos (FDT) del Sistema Bibliográfico de la CEPAL (SIB

Presenta la tabla de definición de campos y sus características: número de campo, nombre, largo máximo, y repetibilidad.

Ayuda memoria (3): Instrucciones para el poblamiento de una base de datos bibliográfica con estructura definida por el Sistema Bibliográfico de la CEPAL (SIB

Explica los procedimientos a seguir para realizar las funciones de crear o poblar bases de datos, con el resultado de una búsqueda o con el total de una base de datos.

Bases de datos del Sistema de Información Bibliográfica de la CEPAL (SIB

Contiene información sobre las bases de datos de la Biblioteca CEPAL, del CLADES y del CELADE.

Morphological Variation of Primary Reproductive Structures in Males of Five Families of Neotropical Bats

Bats present unique features among mammals with respect to reproduction, and although neotropical bats do not have a hibernation period, many of their reproductive characteristics vary seasonally and interspecifically. Thus, this work aimed to examine the reproductive structures of 18 species belonging to five families of Brazilian bats. The gross anatomy of the testes varied little; however, the epididymis of Emballonuridae and Vespertilionidae showed exceptional structures with a large elongation of the caudal region. We observed a wide variation in the positioning of the testes: Phyllostomidae and Noctilionidae presented external testes; Emballonuridae and Molossidae presented migratory testes that may be in intra-abdominal or external positions; and Vespertilionidae displayed scrotal testes. In the histological evaluation, we observed a different pattern in vespertilionid species, with testicular regression and sperm retention/storage in the cauda epididymis in the five species analyzed. Similar testicular regression was observed in Molossops temminckii; however, sperm retention/storage was not observed in this species. These data suggest that although the species analyzed are tropical species that do not present a prolonged period of torpor (hibernation), they still maintain a period of seminiferous tubule regression and sperm storage very similar to that observed in hibernating bats. © 2012 Wiley Periodicals, Inc.

El comercio exterior latinoamericano en el primer semestre de 1958 = Latin American foreign trade in the first half of 1958

Incluye Bibliografía

The United Nations and ECLAC at the half-century mark of the Organization

Includes bibliography

Latin American families: convergences and divergences in models and policies

Includes bibliography

Changes and inequality in Latin American families

Includes bibliography

Capital formation in Latin America: one and a half century of macroeconomic dynamics

Includes bibliography

From doubly labelled water to half-life; validating radio-isotopic rubidium turnover to measure metabolism in small vertebrates

The doubly labelled water method (DLW) is widely used to measure field metabolic rate (FMR), but it has some limitations. Here, we validate an innovative technique for measuring FMR by comparing the turnover of isotopic rubidium (86Rb kb) with DLW depletion and the rate of CO2 production (V·co2) measured by flow-through respirometry (FTR) for two dunnart species (Marsupialia: Dasyuridae), Sminthopsis macroura (17 g) and Sminthopsis ooldea (10 g). The rate of metabolism as assessed by V·co2 (FTR) and 86Rb kb was significantly correlated for both species (S. macroura, r2 = 0·81, P = 1·19 × 10-5; S. ooldea, r2 = 0·63, P = 3·84 × 10-4), as was V·co2 from FTR and DLW for S. macroura (r2 = 0·43, P = 0·039), but not for S. ooldea (r2 = 0·29, P = 0·168). There was no relationship between V·co2 from DLW and 86Rb kb for either species (S. macroura r2 = 0·22, P = 0·169; S. ooldea r2 = 0·21, P = 0·253). We conclude that 86Rb kb provided useful estimates of metabolic rate for dunnarts. Meta-analysis provided different linear relationships between V·co2 and 86Rb kb for endotherms and ectotherms, suggesting different proportionalities between metabolic rate and 86Rb kb for different taxa. Understanding the mechanistic basis for this correlation might provide useful insights into the cause of these taxonomic differences in the proportionality. At present, it is essential that the relationship between metabolic rate and 86Rb kb be validated for each taxon of interest. The advantages of the 86Rb technique over DLW include lower equipment requirements and technical expertise, and the longer time span over which measurements can be made. The 86Rb method might be particularly useful for estimating FMR of groups for which the assumptions of the DLW technique are compromised (e.g. amphibians, diving species and fossorial species), and groups that are practically challenging for DLW studies (e.g. insects). © 2013 British Ecological Society.

ILPES: su función en la segunda mitad de los 80. Líneas de trabajo para 1987 y 1988-1990 = ILPES: its role in the second half of the 1980s. Guidelines for activities in 1987 and 1988-1990

Presenta una breve reflexión sobre nuevos aspectos de la planificación y de la coordinación de políticas públicas, pensadas ambas desde la perspectiva de América Latina y el Caribe. Contiene la propuesta de programa de trabajo para 1987: asesoría, capacitación, coordinación técnica, proyectos específicos, de las unidades descentralizadas (Caribe e Istmo Centroamericano), y lineamientos para 1988-1990.