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Mostrando ítems 791-800 de 1615
Híbridos silvestres de patos (Anseriformes: Anatidae) registrados en Costa Rica
(2016-09)
Informamos la existencia de tres híbridos silvestres de patos en Costa Rica, basados en observaciones esporádicas en el país. Adicionalmente, proveemos una explicación de cuáles, serían las especies que dieron origen a ...
Recolecta de artrópodos para prospección de la biodiversidad en el Área de Conservación Guanacaste, Costa Rica
(Revista de Biología Tropical 52(1): 119-132, 2004, 2004)
This study describes the results and collection practices for obtaining arthropod samples to be studied as potential sources of new medicines in a bioprospecting effort. From 1994 to 1998, 1800 arthropod samples of 6-10 g ...
Desarrollo y perspectivas de la genética humana en Costa Rica
(Acta Pediátrica Costarricense 12:87-94, 1998)
The development and perspectives of human genetics in Costa Rica are analyzed In relation to research, human resources formation, and social and scientific impact. A review of the scientific literature during the last 25 ...
Empirical evidence for multiple costs of begging in poison frog tadpoles
(2018)
In recent decades, theoretical and empirical work has investigated the relative roles of costs and benefits in inhibiting excessive displays of begging to parents. Whether costs are important in maintaining reliability of ...
Male song variation of Green Violetear (Colibri thalassinus) in the Talamanca Mountain Range, Costa Rica
(2008)
We studied variation in acoustic and temporal characteristics of the static male song of the Green Violetear (Colibri thalassinus) in a single population in Costa Rica. The static song of 19 males was extremely variable. ...
Perspectivas y aplicaciones reales del grafeno después de 16 años de su descubrimiento
Perspectives and real applications of graphene at 16 years after its breakthrough
Perspectivas e aplicações reais do grafeno após 16 anos de sua descoberta
(2021)
A 16 años del gran descubrimiento del grafeno los focos de atención vuelven a estar en este material con el reporte de su comportamiento superconductor dependiendo del apilado de sus capas. Sin embargo, su nombre durante ...
Xantismo en peces cíclidos (Cichliformes: Cichlidae) costarricenses, y variación ontogenética en Parachromis dovii
Xanthism in Costa Rican Cichlid fish (Cichliformes: Cichlidae), and ontogenetic variation in Parachromis dovii
(2021)
Introducción: El xantismo o xantocromismo es una anomalía fenotípica que se evidencia por la producción predominante de xantina, un pigmento que le da al organismo una coloración amarillenta. En Costa Rica existen pocos ...
Phylogenetic reassessment of Acianthera (Pleurothallidinae: Orchidaceae)
(2016-12-31)
The phylogenetic relationships within the Acianthera affinity are re-evaluated using Bayesian analyses of nrITS and chloroplast matK sequence data. Emphasis is made on species from the Antilles, Central America and the ...
Four new species of Lockhartia (Orchidaceae, Oncidiinae)
(2014)
Four new species of Lockhartia are described and illustrated: L. compacta from Bolivia, L. endresiana from Costa Rica, L. rugosifolia from Ecuador and Peru, and L. tenuiflora from Ecuador and Colombia. Comments are given ...