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Now showing items 450-469 of 13280
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Amor en la selva
(Universidad Nacional, Costa Rica, 2001) -
Ampliación de la base geodésica Barranca
(Universidad Nacional (Costa Rica), 1991)La Red Geodésica Nacional se estableció por medio de una triangulación entre 1945 y 1955. El trabajo geodésico consistió en la medición de las bases Barranca y Bataan, la determinación de las bases de dichas bases, la ... -
Ampliación del Zoocriadero de Mariposas Maravilla para la producción y comercialización de pupas, de la especie Morpho helenor
(Universidad Nacional, Costa Rica, 2020-08)El comercio de mariposas es una actividad desarrollada en el país desde hace algunos años, que da pie al nacimiento de emprendimientos familiares o pequeñas empresas para la producción y comercialización de diversas especies ... -
Amplitud de hábitat y su relación con la masa corporal, gremio trófico y riesgo de extinción en murciélagos filostómidos (Chiroptera: Phyllostomidae) de distribución continental
(Universidad Nacional (Costa Rica), 2021)La amplitud de hábitat representa la variación en el número de ambientes en los que una especie logra ejercer su forma de vida. Esta medida a su vez es un indicador de la tolerancia de las especies ante la variación de ... -
An action plan to provide learners with balanced input in EFL classrooms
(II Congreso Internacional de Lingüística Aplicada CONLA UNA, 2015)A través del tiempo, se han dado opiniones varias relacionadas con la forma en que los estudiantes reciben la información durante las clases de inglés y si esta información es transmitida de tal manera que los alumnos ... -
An activity theory approach to study barriers of faculty regarding technology integration in higher education
(10th International Technology, Education and Development Conference. Inted, 2016-03-09)Information and communication technologies are instruments for supporting new ways of teaching and learning. Nevertheless, its impact concerning scope has not reached the expected level. This strain between benefits and ... -
An analysis of the socio-cultural content of the locally-produced series of fextbooks Have Fun, and a proposal for model complementary material on foreign culture awareness
(Escuela de Literatura y Ciencias del Lenguaje, 2002)Este estudio propone el análisis del contenido socio-cultural de la serie de textos Have Fun con el propósito de determinar ese contenido cultural, como se integra el mismo en los textos y finalmente preparar una muestra ... -
An Anatomical and Radiographic Study on the Vertebral Column of the Two-Toed Sloth (Choloepus hoffmanni)
(Universidad Nacional, Costa Rica, 2021-04-23)El Choloepus hoffmanni es un mamífero del superorden Xenarthra que se distribuye desde América Central hasta América del Sur. Estos animales comúnmente llegan a los centros de atención y valoración de fauna silvestre ... -
An anatomical comparison between bunch and fruit of oil palm with pineapple leaf and three woods from plantations in Costa Rica
(Journal of Oil Palm Research, 2013-04)Elaeis guineensis, Ananas comusus and forest plantations are planted widely in Costa Rica; however their residues (8000 t) are not utilised. The main objective of this work was to undertake an anatomical description of the ... -
An approach to rheological and electrokinetic behaviour of lipidic vesicles covered with chitosan biopolymer
(Elsevier, 2008)The rheological and electrokinetic properties of soybean lecithin vesicles prepared from concentrated soy lecithin dispersions (250 g/L) obtained by slow swelling under shear conditions and mixed with chitosan biopolymer ... -
An assessment of anticompetitive conduct in the supermarkets sector in Costa Rica
(Elgaronline.com, 2016-09-30)The studies were based on the assumption, common to all advocates of competition policy, that a workably competitive marketplace is achievable where private impediments to competition are removed and that government ... -
An electrophoretic study on phospholipase A2 isoenzymes in the venoms of Central American crotaline snakes
(Elsevier, 1992)The number and isoelectric points of phospholipase A2 isoenzymes were studied in the venoms of 12 Central American crotaline snakes of the genera Bothrops, Crotalus, Lachesis and Agkistrodon. The study was carried out by ... -
An environmental niche model to estimate the potential presence of venezuelan equine encephalitis virus in Costa Rica
(International Journal of Environmental Research and Public Health, 2020-12-30)Venezuelan equine encephalitis virus (VEEV) is an arbovirus transmitted by arthropods, widely distributed in the Americas that, depending on the subtype, can produce outbreaks or yearly cases of encephalitis in horses ... -
An evaluation of variables affecting the stability and performance of down-flow anaerobic fixed bed reactors treating piggery wastewater
(Taylor & Francis, 2006)The influence of the most important variables on the stability and performance of down-flow anaerobic fixed bed reactors treating piggery wastewater after primary sedimentation was evaluated at HRT in the range of 1-6 d ... -
An exploration of the reflective teaching component of the bachillerato en la enseñanza del inglés para I y II Ciclo con salida lateral de diplomado at the Universidad Nacional
(Universidad Nacional (Costa Rica). Escuela de Literatura y Ciencias del Lenguaje, 2009)Investiga si los estudiantes docentes se están preparando para convertirse en practicantes reflexivos como lo pretende los cursos “Teaching Practicum” y “Classroom Project”. Sus objetivos específicos consisten en responder ... -
An exploratory study on writing problems present in students of tourism at the Universidad Nacional Brunca Campus and a proposal of a remedial plan
(Universidad Nacional, Costa Rica, 2009)Esta es una investigación de carácter cualitativo que se llevó a cabo en la Universidad Nacional en la sede Regional Brunca, localizada en el cantón de Pérez Zeledón, San José, Costa Rica. La misma exploró y diagnostico ... -
An improved P-wave velocity reference model for Costa Rica
(Universidad Nacional Autónoma de México, 2001-01-01)Derivamos un modelo de velocidad unidimensional para la onda P en Costa Rica, el cual puede servir en la rutina de localización de eventos sísmicos y como modelo de referencia para tomografía en 3 dimensiones. La inversión ... -
An in vivo model to study the anti-malaric capacity of plant extracts
(Universidad de Costa Rica, 1998)An in vivo model to study the antimalaric effect of plant extracts is described. White mice (25-30g body weight) are treated subcutaneously with 0.6ml of the diluted extract starting seven days before P. berghei infection; ... -
An insight into the antibiofilm properties of Costa Rican stingless bee honeys
(Journal of Wound Care, 2017-04-05)Our objective is to examine the the antibiofilm properties of stingless bee honeys. Meliponini honeys from Costa Rica were examined along with Medihoney as a reference. All honeys were submitted to a screening composed of ... -
An undescribed species of velvet worm from Chiapas, Mexico (Onychophora: Peripatidae)
(Universidad Estatal a Distancia (Costa Rica), 2018-06)Onychophoran worms are considered “living fossils” because their basic body structure has changed little in 500 million years. Only two species have been properly recorded from Mexico: Macroperipatus perrieri from ...