Una mirada epistemométrica de la Revista Médica de Chile y su aporte al conocimiento en Medicina

Indexación: ScieloBackground: During the last decade Revista Médica de Chile increased its visibility, measured on citations and impact factor. Aim: To perform a scientometric analysis to assess the performance of Revista Médica de Chile. Material and methods: Thomson's-ISI Web of Science and Journal Citation Reports QCR) were consulted for performance indicators of Revista Médica de Chile and Latin Amerícan journals whose subject is General and Internal Medicine. We also report the h-index of the journal, which infers quality ¡inked to the quantity of the output. Results: According to the h-index, Revista Médica de Chile ranks 4 among the 36 journals indexed and published by Argentina, Brazil, Chile and México. The top ten articles published by Revista Médica de Chile and the institutions with the higher contríbution to the journal, were identified using citations. In the Latin Amerícan región, Brazil relevantly increased its scientific output. However, Argentina, Chile and México maintain a plateau during the last decade. Conclusions: Revista Médica de Chile increased notoriously its performance. Its contríbution to the Chilean scientific community dedicated to Medicine appears to be of central value.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872008000800016&nrm=is

La falta de un adecuado reconocimiento de las capacidades existentes afecta el desarrollo científico en Chile

Indexación: ScieloUna vez más hemos logrado avanzar en el posicionamiento de Biological Research.En efecto, la reciente edición del Journal of Citation Reports del ISI informa que el Factor de Impacto de la revista para el año 2002 superó en forma significativa al alcanzado el año anterior (1). El valor ahora obtenido _1,444_ nos ubica en el lugar 20 en Biología de un total de 62 revistas registradas en el contexto de este campo disciplinario. El ranking 2002 en Biología está liderado por Bioessays (impacto 7,888). Le sigue FASEB J con un impacto de 7,252. El año 2001 Biological Research tuvo un impacto de 1,154 (1), frente al 0,680 de 2000 y al 0,490 de 1999

Ciencia y Política

Indexación: ScieloRecurrentemente, en los países con menos desarrollo, se valora escasamente a la ciencia y la tecnología. Con ello se contaminan las propuestas que surgen del creciente número de personas que cree saber lo que se necesita sin comprender, en verdad, la complejidad que implican las políticas públicas para la ciencia y la tecnología.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000100001&lng=es&nrm=is

Genomic organization of the rDNA cistron of the teleost fish Cyprinus carpio

The seasonal adaptation of the teleost Cyprinus carpio to the cyclical changes of its habitat demands physiological compensatory responses. The process involves profound nucleolar adjustments and remarkable changes in rRNA synthesis, which affects ribosomal biosynthesis. In this context, we have demonstrated that the synthesis of several proteins involved in ribosomal biogenesis as protein kinase CK2, ribosomal protein L41 and nucleolin, as well as U3 snoRNP, are differentially regulated in summer-acclimatized carp compared to the cold-season adapted fish. To understand the mechanisms involved in the seasonal regulation of rRNA gene transcription, we have been studying the carp rDNA cistron structure. Because the cis-elements that regulate the expression of the tandem organized ribosomal genes are located in the non-transcribed intergenic spacer (IGS), we analyzed the primary structure of the carp rDNA gene IGS. The gene organization is similar to that described from other vertebrate species, including numerous repetitive sequences, the transcription start site, and some potential cis-elements such as ribosomal enhancers, proximal terminator and transcriptional terminators. Ribosomal DNA is a remarkable case of gene duplication and has been used as a model to test the concerted evolution theory. We performed sequence comparison analyses of 18S rRNA coding sequences from carp with different species, data with which an unrooted phylogram was constructed