Browsing Escuela de Ciencias Biológicas by Title
Now showing items 793-812 of 1184
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Integración curricular de los principios de la Carta de la Tierra y los Objetivos de Desarrollo Sostenible, en el programa de ciencias y educación ambiental de noveno año, en un colegio privado, en Moravia, San José, Costa Rica
(Universidad Nacional (Costa Rica), 2018)Esta investigación tiene como propósito diseñar una propuesta de recomendaciones curriculares, que integrara la Carta de la Tierra y los Objetivos de Desarrollo Sostenible de la ONU (Organización de las Naciones Unidas), ... -
Intensive Rearing of Juveniles of cichlasoma managuense (Günther 1869) in recirculated systems
(Universidad Nacional, Costa Rica, 1991-01-01)The growth performance of guapote juveniles in recirculated systems from spawning to a mean weight of about 3 gramms is described. Culture began with a 15 days nursing phase with either first instar-nauplii or fresh ... -
Interaction of bacteria and male reproductive system blackening disease of captive Penaeus setiferus
(Elsevier, 1993)The genital apparatus of male penaeid shrimp, Penaeus sett’ferus, blackens with resulting detrimen tal effects ton mating for production of larvae when animals are kept in controlled maturation/repro duction situations. A ... -
Isolation and characterization of partial insulin-like androgenic gland hormone gene from distal terminal ampoules of three marine shrimp Penaeus species from the Eastern Pacific
(2018)The expansion of the shrimp industry depends on scientific advances related to the understanding of reproductive endocrinology that allows the development of aquaculture programs based on biotechnology. An insulin ... -
Isolation and partial purification of a hemolytic sphingomyelin-inhibitable fraction from the sea anemone Anthopleura nigrescens
(2014-03)Actinoporins are highly hemolytic pore-forming proteins with a molecular mass of around 20 kDa and high affinity for sphingomyelin-containing membranes. On the crude extract of the sea anemone Anthopleura nigrescens, the ... -
Isolation of ammonium- and nitrite-oxidizing bacterial strains from soil, and their potential use in the reduction of nitrogen in household waste water
(Universidad de Costa Rica, 2017-12-01)Currently, nitrogen has become the main element of water pollution, causing riverine, lacustrine and coastal eutrophication. The continuous contamination of aquifers and the absence of planned water resource utilization, ... -
Isolation on a remote island: genetic and morphological differentiation of a cosmopolitan odonate
(Nature Publishing Group, 2019-06-01)Although low levels of genetic structure are expected in highly widespread species, geographical and/or ecological factors can limit species distributions and promote population structure and morphological differentiation. ... -
Isotopic composition in precipitation and groundwater in the northern mountainous region of the Central Valley of Costa Rica
(Taylor & Francis, 2016)The linkage between precipitation and recharge is still poorlyunderstood in the Central America region. This study focuses onstable isotopic composition in precipitation and groundwater in the northern mountainous region ... -
Landscape analysis for the American crocodile Crocodylus acutus (Reptilia: Crocodilidae) in northwestern Costa Rica
(Instituto de Biología de la UNAM (México), 2022-10-18)Northwest Costa Rica has the largest crocodile population in the country, but it is also an important area of the human population growth, tourism, crops, and aquaculture, that have generated great changes in the region. ... -
Larvae of the Costa Rican Hetaerina (Odonata: Calopterygidae) with comments on distribution
(Royal Entomological Society, 1993)The larvae of seven of the nine Costa Rican species of Hetaerina (H.capitalis, H.cruentata, H. fuscogutfata, H. majuscula, H. miniata, H. occisa and H. titia) were identified by matching their Cellulose Acetate Gel ... -
Late onset autosomal dominant Charcot– Marie–Tooth 2 neuropathy in a Costa Rican family
(W.S. Maney & Son Ltd., 2009)Objective: To describe the clinical, electrophysiologic and morphologic features of a Costa Rican family with an autosomal dominant inherited Charcot–Marie–Tooth (CMT) neuropathy. Methods: The field study took place in ... -
Latitudinal regionalization of epibenthic macroinvertebrate communities on rocky reefs in the Gulf of California
(Marine Biology Research vol.12 no.4 389-401 2016, 2016-04-27)We report on a latitudinal pattern in the structure and species composition of epibenthic macroinvertebrate communities on rocky reefs along a gradient of eight degrees of latitude in the Gulf of California. We provide ... -
Leaf life span spectrum of tropical woody seedlings: effects of light and ontogeny and consequences for survival
(Oxford University Press, Annals of Botany Company, 2013-03-26)Background and AimsLeaf life span is widely recognized as a key life history trait associated with herbivory resistance, but rigorous comparative data are rare for seedlings. The goal of this study was to examine how light ... -
Liberación de juveniles de pargo manchado Lutjanus guttatus (Steindachner, 1869), como estrategia para la conservación de la especie y educación ambiental marino costera
(Universidad Nacional de Colombia, 2019)La percepción ambiental como herramienta de educación y sensibilización a la conservación de los recursos marinos, fue implementada en la liberación de 102.000 juveniles de Lutjanus guttatus con la participación activa ... -
Lichen community structure and richness in three mid-elevation secondary forests in Costa Rica
(Universidad de Costa Rica (Costa Rica), 2021-06-21)Introduction: Lichen diversity, community structure, composition and species abundance have been used as indicators of the integrity and ecological continuity of tropical forest ecosystems. Objectives: To assess ... -
Life zone and habitat disturbance do not explain the coexistence in Sturnira bat species
(Springer (Alemania), 2022-06-23)One of the key questions in ecology is to understand the mechanisms that modulate the coexistence between syntopic species. Climate and habitat perturbation gradients have been proposed as moderators of species coexistence. ... -
Lineamientos generales sobre educación científica
(Universidad Michoacana de San Nicolás de Hidalgo, 2014)Ante los retos que representa la tendencia mundial a la globalización y el mundo de constantes transformaciones, donde la ciencia y la tecnología se entrelazan para ofrecer opciones de solución a problemáticas comunes, se ... -
Lineamientos para la arborización de las zonas verdes públicas de la parte baja de San Rafael de Heredia, Costa Rica, considerando especies vegetales que suministren recursos a la avifauna
(Universidad Nacional, Costa Rica, 2018)Actualmente, existe un acelerado crecimiento de los núcleos urbanos, caracterizado por la falta de lineamientos de planificación para proteger la flora y fauna. Esto ha desencadenado que muchas especies desaparezcan de las ... -
Lista agregada de peces en tres zonas de manglar del golfo de Nicoya, Costa Rica
(Universidad Nacional (Costa Rica), 1995-02-22)El conocimiento en nuestro país sobre la ictiofauna asociada a zonas de manglar es escaso, especialmente en zonas alejadas de la parte central del Golfo. La suma de características físicas y biológicas que se dan en estas ... -
Lista con las anotaciones y caracterización de la avifauna de los Sectores Carrillo, Zurquí y Barva del Parque Nacional Braulio Carrillo.
(Universidad Nacional (Costa Rica), 2000)En este estudio se confeccionaron los listados con anotaciones de la avifauna registrada en los sectores Carrillo, Zurquí y Barva, del Parque Nacional Braulio Carrillo. Con el desarrollo del mismo se obtuvo un banco de ...