Listar Biología por título
Mostrando ítems 1230-1249 de 1634
-
Quantitation of myonecrosis induced by myotoxin a from prairie rattlesnake (Crotalus viridis viridis) venom
(1982)Using a pure myotoxin (myotoxin a) isolated from prairie rattlesnake Crotalus viridis viridis) venom, a comparison between two methods for quantitating myonecrosis in mice was made. Measurement of creatine kinase (CK) ... -
Quantitative genetic analysis of anxiety trait in bipolar disorder
(2017)Background:Bipolar disorder type I (BPI) affects approximately 1% of the world population. Although geneticinfluences on bipolar disorder are well established, identification of genes that predispose to the illness has ... -
Quantitative Physiology Approaches to Understand and Optimize Reducing Power Availability in Environmental Bacteria
(2015-06-04)The understanding of how carbon fluxes are distributed through a metabolic network offers an overview of the pathways that a given microorganism uses to produce energy, reducing power, and biomass. These invaluable data ... -
Ramphocelus passerinii alimentando pichones de Turdus grayi y notas sobre la reproducción de otras especies de Ramphocelus
(2015)En esta nota presentamos observaciones de un Ramphocelus passerinii alimentando juveniles de Turdus grayi. Además, ampliamos los registros de la época reproductiva para Ramphocelus costaricensis y Ramphocelus carbo. Esta ... -
Range expansion and noteworthy records of Costa Rican birds (Aves)
(2018-01-19)We present new distribution information for 19 species of Costa Rican birds. Thirteen species show changes in altitudinal distribution, 9 are recorded at higher elevations such as Egretta rufescens (Gmelin, 1789), Heliomaster ... -
Range expansion of the Gulf Coast Toad, Incilius valliceps (Wiegmann, 1833) (Anura, Bufonidae), from Costa Rica
(2020-06-02)We report the range expansion of the Gulf Coast Toad, Incilius valliceps (Wiegmann, 1833), from tropical moist forests to tropical wet forests and towards southeastern Costa Rica. We evaluated erroneous reports of this ... -
Range extension for the Costa Rican Blindsnake, Amerotyphlops costaricensis (Jiménez & Savage, 1962) (Serpentes, Typhlopidae)
(2020-08-08)Amerotyphlops. costaricensis is difficult to observe in the field and is considered a rare species. There are fewer than ten individuals deposited in museum collections, representing roughly one population in both Nicaragua ... -
Range overlap and association patterns in the tent-making bat Artibeus watsoni
(2007)Space use and ranging patterns of individuals have traditionally been used to identify social systems, and the amount of overlap in the home ranges of individuals can provide indirect information about the likelihood of ... -
Rapid assessment of myxomycetes in Isla Calero and Isla Brava, Costa Rica
(2022-03-02)The geography of the northeasternmost section of Costa Rica corresponds to river islands sparsely populated and highly protected for biological conservation. Myxomycetes had not been studied in that part of such Central ... -
Rapid assessment of the distribution of myxomycetes in a southwestern Amazon forest
(2012-07-02)The distribution of fruit bodies of myxomycetes under different ecological conditions at the Los Amigos Biological Station in southeastern Peru was studied. Six study areas were surveyed using a combined field-laboratory ... -
Rapid diversification of the Variable Seedeater superspecies complex despite widespread gene flow
(2022)Disentangling the evolutionary relationships of rapidly radiating clades is often challenging because of low genetic differentiation and potentially high levels of gene flow among diverging taxa. The genus Sporophila ... -
Rapid evolution of a floral trait following acquisition of novel pollinators
(2021-04)1. Changes in the pollinator assemblage visiting a plant can have consequences for reproductive success and floral evolution. We studied a recent plant trans-continental range expansion to test whether the acquisition of ... -
Rasgos de los forófitos de Guazuma ulmifolia y Samanea saman y su influencia en la distribución espacial, abundancia y diversidad de plantas epífitas
(2021)Los rasgos de la corteza en los forófitos influyen en el establecimiento y la distribución espacial de plantas epífitas. Ante esto, en el campus de la Universidad Técnica Nacional, sede Atenas, Costa Rica, se evaluó la ... -
Recent findings of Isthmohyla pictipes (Anura: Hylidae) in Costa Rica: variation and implications for conservation
(2020-10-21)We report recent findings of Isthmohyla pictipes (Cope, 1875) in the Cordillera de Talamanca, Costa Rica, roughly two decades after it was last registered. We provide notes on microhabitat use, color variation, external ... -
Recent origin and rapid speciation of Neotropical orchids in the world's richest plant biodiversity hotspot
(2017)The Andean mountains of South America are the most species‐rich biodiversity hotspot worldwide with c. 15% of the world's plant species, in only 1% of the world's land surface. Orchids are a key element of the Andean flora, ... -
Recircumscription of Pityphyllum (Orchidaceae: Maxillariinae)
(2006-03)Based upon morphological and molecular evidence, Maxillaria huancabambae (Kraenzl.) C. Schweinf. and M. saragurensis Dodson are transferred to Pityphyllum Schltr. These and other species of Pityphyllum are illustrated with ... -
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 ... -
Recomendaciones para mejorar el manejo de comederos artificiales para colibríes
(2019)El uso de comederos artificiales para alimentar a las aves es una práctica extendida y de uso generalizado principalmente en sitios turísticos, tales como hoteles de montaña, parques naturales, y jardines privados. En el ... -
Reconsideration of Trichosalpinx minutipetala (Ames & C.Schweinf.) Luer (Orchidaceae: Pleurothallidinae)
(2011-02)Trichosalpinx minutipetala, considered a synonym of T. memor since 1997, is here recognized as a distinct species. -
Rediscovering the value of families for psychiatric genetics research
(2018-06-28)As it is likely that both common and rare genetic variation are important for complex disease risk, studies that examine the full range of the allelic frequency distribution should be utilized to dissect the genetic ...