Browsing Facultad de Ciencias Exactas y Naturales by Title
Now showing items 2402-2421 of 2543
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The proteolytic digestive activity and growth during ontogeny of Parachromis dovii larvae (Pisces: Cichlidae) using two feeding protocols
(2014)Se evaluó la actividad proteolítica digestiva y el crecimiento de larvas de Parachromis dovii durante la ontogenia en un sistema de recirculación utilizando dos estrategias de alimentación durante un período de 28 días. ... -
The regionalization of a university project of educational robotics to help Costa Rican youth to avoid drug consumption
(Institute of Electrical and Electronics Engineers Inc., 2019)The following article presents the experience of the regionalization of the Training of Trainers in Robotics project in Schools in vulnerable areas of Costa Rica to the different regions outside the Greater Metropolitan ... -
The relationship between humidity, light and the activity pattern of a velvet worm, Epiperipatus sp. (Onychophora: Peripatidae), from Bahía Drake, South Pacific of Costa Rica
(Instituto Internacional de Ecología (Brasil), 2018-10-31)Even though the Onychophora represent a whole phylum, observations of their activity pattern in nature are almost non-existent. Here we report on the relationship between humidity and light and activity pattern of a new ... -
The relationship between information and communication technology and productivity in Costa Rican companies
(IEEE Explore, 2012-10-01)This paper presents the results of a research aimed at studying the effect of information and communications technology (ICT) on productivity, using the data of the Costa Rican innovation survey 2008. The results obtained ... -
The relationship between perch type and aggressive behavior in the lizard Norops polylepis (Squamata: Dactyloidae)
(Universidad de Sao Paulo, 2015)The intensity of aggression against intruders by owners of a territory has been related to the type of resources available to an individual within its territory. The influence of perch-site characteristics on aggressive ... -
The rip current hazard in Costa Rica
(2015-01-31)Deaths from rip currents are a major hazard on global beaches, but few data are available at a national scale to support the development of appropriate intervention programs. Analysis of data from the Judicial Investigation ... -
The rock coast of South and Central America
(Geological Society Memoirs 2014, 2014-07)The great variety of climatic conditions, tidal ranges and wave regimes of South and Central America act on a complex geology and tectonic framework. Many of the rock and cliffed coasts of South America are strongly ... -
The structure and function of dry weather mangrove on the Pacific Coast of Central America, with emphasis on Avicennia bicolor forests
(Estuaries Research Federation, 2013)Mangrove forests along the Pacific Coast of Central America cover around 4,000 km2. Most of this coast is occupied with tropical dry forest mangroves where basal areas range between 6 and 20 m2 ha−1 and canopy heights ... -
The Use of the Arm Circumference as a Measure to Detect Underweight in Individuals Aged 60 Years or Older Living in Costa Rica
(Universidad Nacional (Costa Rica), 2023-09-01)[Objective]: This investigation focuses on the association between arm circumference and body mass index, and the estimation of cutoff values of this arm measurement for identifying low weight ... -
Thermal niche breadth and their relationship with sturnira bat species diversification
(Elsevier (Países Bajos), 2023-10)The interaction between climatic conditions and the ability of organisms to maintain homeostasis regulates the distribution of species on the planet. However, its influence on macroevolutionary dynamics is not well ... -
Thoracic nerve cord - ganglia recognition in intraspecific and interspecific transplants in the white shrimp, Penaeus (Litopenaeus) vannamei
(Science Direct, 2009-03)The recognition response of Penaeus (Litopenaeus) vannamei against thoracic nerve cord–ganglia transplants from three species of Penaeidae: P. vannamei, P. (Litopenaeus) stylirostris, and Trachypenaeus byrdi, and one species ... -
Three New Species and New Records of Dennstaedtia Bernh. from Mesoamerica
(Universidad Nacional, Costa Rica, 2018)Navarrete & Øllgaard [1] indicated the presence of a “C” group within Dennstaedtia Bernh. that contains D. obtusifolia (Willd.) T. Moore, which is the type material of the genus Patania C. Presl and indicated that it ... -
Three New Species of Ferns (Pteridophyta) from Mesoamerica
(Universidad Nacional (Costa Rica), 2017-05-25)In this research three new species of ferns of the Polypodiales Order are described: Ctenitis leonii A. Rojas, Elaphoglossum karinae A. Rojas and Pecluma celaquensis A. Rojas. Ctenitis leonii is characterized by its apical ... -
Three new species ofElaphoglossum Schott ex J. Sm. (Dryopteridaceae) from the pacific of Costa Rica
(Universidad Nacional (Costa Rica), 2017-12)In this paper three new species of Elaphoglossum Schott ex J. Sm., are described and illustrated, located on the pacific slope of Cordillera de Talamanca and Cerro Caraigres (Cerro Dragón), Costa Rica. The new ... -
Time delay performance analysis of sensor allocation strategies on a WSN
(ACWR 2011 - Proceedings of the International Conference on Wireless Technologies for Humanitarian Relief, 2011)In many of query-based WSN applications, response time factor is an essential issue. Overall performance under different sensor placements depends on the pattern of queries requested from the network, which in turn might ... -
To what extent are faculty ready to participate in the OER movement? The case of the Informatics School, UNA
(Sociedad Argentina de Informática e Investigación Operativa (SADIO), 2017-09)The success and sustainability of the Open Educational Resources (OER) movement depends to a large extent on large-scale participation in the use and production of educational resources. The aim of this paper was to explore ... -
Tolerancia al calor en Solanum lycopersicum var. cerasiforme comercial y Solanum spp. silvestre, según análisis de marcadores tipo RAPD y genes específicos, y su relación con la productividad
(Universidad Nacional (Costa Rica), 2017)El cambio climático genera alteraciones en las condiciones ambientales que repercuten en los diferentes organismos. En las plantas, la búsqueda de genotipos con loci asociados a la tolerancia al calor resulta necesaria. ... -
Tolerancia térmica en especies arbóreas y enredaderas nativas de Costa Rica: Uso de la sensibilidad de la flourescencia de la clorofila como un bioindicador de la termo tolerancia
(Universidad Nacional (Costa Rica), 2019-06)El proceso de fotosíntesis parte de la energía es atrapa por el centro de reacción es utilizada para la producción de los hidratos de carbono y otra parte es disipada como calor y en menor grado re emitida como energía ... -
Topografía para la construcción y control de túneles
(Universidad Nacional (Costa Rica), 2009-08)Dentro de la construcción de obras civiles, los topógrafos y geodestas constituyen un aporte muy importante en su diseño, construcción y control. En este orden de ideas, cabe referirse específicamente a la construcción de ... -
Torneo Estudiantil de Programación como estrategia para fomentar el aprendizaje de la programación de computadoras en los estudiantes de la Escuela de Informática de la Universidad Nacional
(Universidad Nacional (Costa Rica), 2020)Esta actividad académica consistió en organizar un Torneo Estudiantil de Programación de Computadoras (TEP), dirigido a estudiantes de primer y segundo año de Bachillerato de la Carrera de Ingeniería de Sistemas de la ...