Listar Ciencias básicas por título
Mostrando ítems 192-211 de 3121
-
Algunos aspectos sobre la institucionalidad y el financiamiento de la Ciencia, la Tecnología y la Innovación en Costa Rica
(2010)Aproximación al estado de la institucionalidad de Costa Rica en materia de ciencia, tecnología e innovación; por medio de un recorrido por las principales características de la institucionalidad a partir del análisis de ... -
Algunos aspectos técnicos sobre la Estación Meteorológica Automática de la Reserva Biológica Alberto Manuel Brenes
(2017)Se describen aspectos relacionados con el emplazamiento, diseño, recolección de datos y mantenimiento de la estación meteorológica automática instalada en la Reserva Biológica Alberto Manuel Brenes. La incorporación e ... -
Algunos datos históricos sobre eclipses de sol en Costa Rica en el Siglo XX
(1991-06)Ante la observación del gran Eclipse Total de Sol, del 11 de julio de 1991, que cubrió la mayor parte del país. Se repasa algunos datos históricos de eclipses ocurridos en Costa Rica durante el siglo 20. -
Algunos Detalles Ultraestructurales de la Morfología Externa del Adulto y la Deutoninfa de Allonothrus neotropicus1 en Costa Rica
(2017-09)Se analiza la ultraestructura de Allonothrus neotropicus con ejemplares recolectados en hojarasca de suelo de la región Caribe de Costa Rica. Los caracteres que definen esta especies son: 1) seta e1 el doble de larga que ... -
Alimentacion de pichones, exito reproductivo y notas sobre cuido parental en yiguirros (Turdus grayi): el rol de las hembras y machos
(2018)Las hembras frecuentemente invierten ma ́s que los machos en cuido parental, pero en sistemas sociales monogamos, los machos invierten tanto como las hembras en el cuido de su progenie y se estima que esta contribucion ... -
Alkaloid contents in members of Lycopodiales
(2001)The composition of alkaloids in fifteen species that belong to the Lycopodiales, which grow wild in Costa Rica were analysed by gas chromatography coupled with mass spectrometry. Several alkaloids were identified, ... -
Alkaloids from Crinum erubescens Aiton
(2016-09)Eight alkaloids have been identified from fresh leaves of Crinum erubescens (Amaryllidaceae) collected in Costa Rica. The alkaloid 1-epidemethylbowdensine, detected by means of GC–MS as part of a global Amaryllidaceae ... -
All-offspring natal philopatry in a Neotropical bat
(2011-11)Natal dispersal is a strategy employed by individuals to avoid reproducing with close relatives. In most bats, incestuous matings are prevented by the departure of one sex; thus, all-offspring philopatry has rarely been ... -
Allometry and stilt root structure of the Neotropical palm Euterpe precatoria (Arecaceae) across sites and successional stages
(2010)The lack of secondary meristems shapes allometric relationships of the palms, infl uencing species segregation according to their capacity to adjust form and function to spatial and temporal changes in environmental ... -
La alometría estática de estructuras bajo selección sexual.
(2012-04-24)El proyecto se diseñó para determinar la alometría del tamaño de las estructuras genitálicas y otras no-genitálicas en varias especies de Coleoptera. El informe es una lista de las publicaciones generadas a partir de la ... -
Alta capacidad de autofecundación y baja visitación de polinizadores en la epífita polinizada por colibríes Pitcairnia heterophylla (Bromeliaceae) en un bosque montano en Costa Rica
(2017)La subfamilia Pitcairnioideae es la segunda más diversa de las bromelias (Bromeliaceae), un grupo exclusivo de la región Neotropical. Las bromelias pitcairnioideas poseen rasgos florales que se asume promueven el exo-cruzamiento ... -
Alternative approaches to determine the efficiency of biomixtures used for pesticide degradation in biopurification systems
(2018)Biopurification systems were developed for the biological treatment of pesticide-containing wastewaters originated from agricultural production. They are aimed at reducing point-source contamination related to the ... -
Alternative principal components regression procedures for dendrohydrologic reconstructions
(2000-11)Streamflow reconstruction using tree ring information (dendrohydrology) has traditionally used principal components analysis (PCA) and stepwise regression to form a transfer function. However, PCA has several procedural ... -
Ammonium and phosphate removal using batch laboratory cultures by microalgae and cyanobacteria isolated from Costa Rica water bodies
(2018)This research analyzed three green microalgae (Scenedesmus sp., Chlamydomonas sp., and Chlorella sp.) and two cyanobacteria (Synechocystis sp. as unicellular strain and Nostoc sp. as filamentous strain) native from Costa ... -
Amphibians and Reptiles of the Tirimbina Biological Reserve: a baseline for conservation, research and environmental education in a lowland tropical wet forest in Costa Rica
(2020-11-30)The Tirimbina Biological Reserve is located in the lowlands on the Atlantic versant of Costa Rica. This study provides an updated comprehensive herpetofauna species list and summarizes the results of all the herpetofauna ... -
An 800-year high-resolution black carbon ice core record from Lomonosovfonna, Svalbard, Atmos
(2018)Produced by the incomplete combustion of fossil fuel and biomass, black carbon (BC) contributes to Arctic warming by reducing snow albedo and thus triggering a snow-albedo feedback leading to increased snowmelt. Therefore, ... -
An adaptive choice of primal constrains for BDDC domain decomposition algorithms
(2016-12-12)An adaptive choice for primal spaces based on parallel sums is developed for BDDC deluxe methods and elliptic problems in three dimensions. The primal space, which forms the global, coarse part of the domain decomposition ... -
An augmented mixed–primal finite element method for a coupled flow–transport problem
(2015)In this paper we analyze the coupling of a scalar nonlinear convection-diffusion problem with the Stokes equations where the viscosity depends on the distribution of the solution to the transport problem. An augmented ... -
An eccentric new species of Stelis from Peru (Orchidaceae: Pleurothallidinae)
(2017)Stelis hualluapampensis, a new species from the cloud forests of Hualluapampa, in the Tayacaja province, Peru, is described and illustrated. Information on its distribution, habitat, phenology, and conservation status, ...