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Now showing items 12531-12550 of 13291
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The effect of Ibuprofen on female and male reproduction of the open thelyca marine shrimp, Litopenaeus
(Aquaculture Research, 2013-03-11)A research was designed to explore the effect of ibuprofen (IBU) as an intervening agent for prostaglandin biosynthesis on male and female reproduction of three species of Litopenaeus. Ovarian maturation was studied in L. ... -
The effect of solution environment and the electrostatic factor on the crystallisation of desmotropes of irbesartan
(Royal Society of Chemistry, 2019)The experimental conditions necessary for stabilising irbesartan (IBS) tautomers in solution and selectively obtaining the desmotropic crystal forms are presented herein. 1H and 2H tautomers were stabilized in specific ... -
The effect of the dam–calf relationship on serostatus to Neospora caninum on 20 Costa Rican dairy farms
(Universidad Nacional, Costa Rica, 2003-03-31)An epidemiological study was conduced on 20 dairy herds previously diagnosed as seropositive for Neospora caninum. The number of females per farm varies from 41 to 296. All females present on the farms were bled once in ... -
The effect of the insecticide diazinon on the osmoregulation and the avoidance response of the white leg shrimp (Penaeus vannamei) is salinity dependent
(Elsevier, 2020-12-15)Diazinon is one of the insecticides that represent a high risk for Costa Rican estuarine environments due to its widespread use in pineapple plantations. In estuaries, organisms are frequently submitted to stress caused ... -
The effects of globalization on artisanal fisheries in the magellan and chilean antarctic region
(University of Amsterdam, 2018)Globalization and changes in international markets have effected the local level by defining and redefining the local production schemes, excluding or including actors, transforming local cultures, and influencing the ... -
The english teacher: a professional under question.
(2012-11-09) -
The fine art of copyediting de Elsie Myers Stainton el español : mucho más que símbolos
(Universidad Nacional (Costa Rica). Escuela de Literatura y Ciencias del Lenguaje, 2008)Aborda las implicaciones lingüístico-comunicativas, culturales e ideológicas de la inclusión de argentinismos y costarriqueñismos en la traducción inglés-español de la obra The Fine Art of Copyediting, la cual versa sobre ... -
The first experiences of the UNA STEM network
(Centro Latinoamericano de Estudios en Informática (Chile), 2021-10)The UNA STEM Network is a proposal of several academics from the Faculties of Exact and Natural Sciences, and Earth and Sea of the National University, which aims to generate appreciation for science in Costa Rican primary ... -
The first gynandromorph of the Neotropical bee Megalopta amoena (Spinola, 1853) (Halictidae) with notes on its circadian rhythm
(Pensoft Publishers, 2020-04-27)Gynandromorphy is an anomaly that results in an organism phenotypically expressing both male and female characteristics. Here we describe the first gynandromorph of the bee species Megalopta amoena (Spinola, 1853) (Halictidae, ... -
The fulfillment of the principles of the communicative approach to teach english as a second language: the case of public Costa Rican high schools
(Tecnológico de Monterrey, 2018-11-08)In Costa Rica since 2003 the teaching of English was redesigned to follow the principles of the Communicative Approach, whose foundation is meant to provide students with classroom opportunities for interaction in a ... -
The genus Whiteringia: A review of its traditional uses, phytochemistry and pharmacology
(International Journal of Herbal Medicine, 2017)The genus Witheringia belongs to Solanaceae family. Some of its species are widely used in traditional medicine to cure several disorders such as diabetes, cancer, malaria, helminthic infections, inflammatory disorders, ... -
The geographic distribution of Costa Rican velvet worms (Onychophora: Peripatidae)
(Revista de Biologia Tropical vol.64 no.4 1401-1414 2016, 2016-06-06)Velvet worms, “peripatus” or onychophorans, are “living fossils” that were geographically widespread in Cambrian seas but now occur exclusively on terrestrial habitats. The only extant species studied in some detail are ... -
The geometry of the Wadati-Benioff zone under southern Central America and its tectonic significance: results from a high-resolution local seismographic network
(Elsevier, 1994)We present here a detailed geometry of the Wadati—Benioff zone under Costa Rica, obtained from seismicity recorded by a dense local seismographic network jointly operated by the Costa Rica Volcanological and Seismological ... -
The geomorphic landscape of the Barva volcano, Costa Rica
(Bellweather Publishing, 2020-03-13)Volcanoes have a beneficial role in human development; however, this balance could turn to hazardous processes or even environmental disturbances. Costa Rica is a volcanic country. The people of Costa Rica live upon these ... -
The good, the bad and the unthinkable of learner autonomy in EFL
(Universidad Nacional, Costa Rica, 2020-02-20)This study assesses the relation between self-evaluation and the development of learner autonomy (LA) in English as a foreign language (EFL). Using action-research, the investigation included 22 first-year students taking ... -
The grammaticalization of specificity (and beyond) in boruca
(Universidad Nacional, Costar Rica, 2000)SPECIFICITY, as many other concepts of human experience, has various linguistic manifestations across languages, varying from lexical expression, e.g. adjectives, as in the English example in (1), to distinctions which ... -
The growth of juvenile jaguar guapote (Cichlasoma managuense) fed diets with different carbohydrate levels
(Universidad Nacional (Costa Rica), 1995-06-27)Se evaluó el crecimiento de juveniles del guapote tigre (Cichlasoma managuense) alimentado con dietas isocalóricas conteniendo niveles de carbohidrato del 11 al 36 por ciento. El experimento se realizó en un sistema de ... -
The histological structure of the androgenic gland and cellular cord of the male reproductive system of adult litopenaeus and rimapenaeus byrdi
(2012-05-01)The current knowledge of the precise extension and location of the androgenic gland (AG) in the genera Litopenaeus and Rimapenaeus is partial. Therefore, we analyzed the complete structure of the AG and cellular cord ... -
The horse as a model for translational orthopedic research: examples of studies on the regeneration of cartilage and bone conducted in Costa Rica
(Universidad Nacional, Costa Rica, 2019)The paper provides results published or to be published of long-term in vivo equine studies to evaluate techniques of possible regenerative matrices of cartilage and bone, by means of cell-free implants or ... -
The Impact of Deforestation, Urbanization, and Changing Land Use Patterns on the Ecology of Mosquito and Tick-Borne Diseases in Central America
(MDPI, 2021)Central America is a unique geographical region that connects North and South America, enclosed by the Caribbean Sea to the East, and the Pacific Ocean to the West. This region, encom- passing Belize, Costa Rica, ...