Browsing Artículos científicos by Title
Now showing items 71-90 of 507
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Caracterización del sustrato y el agua intersticial del manglar de Mata de Limón, Puntarenas, Costa Rica
(Universidad Nacional (Costa Rica), 2023-01-09)Los manglares son sistemas que mediante la interacción marino terrestre varían durante el tiempo y son altamente productivos. El objetivo del estudio fue describir la granulometría, parámetros fisicoquímicos y nutrientes ... -
Caracterización fenotípica y molecular, e influencia de medios de cultivo, en el crecimiento y emisión de luz de bacterias del litoral de La Habana, Cuba
(Universidad de Costa Rica, 2020-09-18)Phenotypic and molecular characterization, and influence of culture media, on the growth and light emission of bacteria from the coast of Havana, Cuba. Introduction: The light-emitting enzyme complex of luminescent bacteria ... -
Caracterización hidrogeoquímica de los acuíferos volcánicos Bar va y Colima en el Valle Central de Costa Rica
(Instituto Mexicano de Tecnología del Agua, Tecnología y ciencias del agua, 2016)La composición química del agua subterránea está determinada por procesos antropogénicos y por interacciones con el material geológico que conforma el acuífero. El presente estudio describe la caracterización ... -
Caracterización molecular por patrones electroforéticos de isoenzimas esterasas en Lemna aequinoctialis y Lemna valdiviana (lemnaceae) de Costa Rica
(Universidad Nacional (Costa Rica), 2008)La familia Lemnaceae carece de características morfológicas y anatómicas con fines comparativos y por ello se recurre a estudios moleculares para una diferenciación más precisa. En Costa Rica encontramos del género Lemna ... -
Características deseables del docente en ciencias en el marco de la metodología de la indagación en la regional de Guápiles Costa Rica
(Universidad Estatal a Distancia (Costa Rica), 2019-11-28)La docencia requiere de cualidades y características que faciliten la promoción de habilidades, competencias, actitudes y conocimiento, que cautiven a los estudiantes en su proceso de aprendizaje. El objetivo de la ... -
Carga bacteriana de los peces Cynoscion squamipinnis(Perciformes: Scianidae) y Lutjanus gutattus (Perciformes: Lutjanidae) en la cadena de comercialización, Costa Rica
(Universidad de Costa Rica, 2009-06)Bacteriological load of the fishes Cynoscion squamipinnisand Lutjanus gutattusin the market-ing chain, Costa Rica. To determine the bacteriological quality of fishery products in the different stages from commercialization, ... -
Changes in digestive enzymes activities during the initial ontogeny of wolf cichlid, Parachromis dovii (Perciformes: Cichlidae)
(Sociedade Brasileira de Ictiologia, 2019)Wolf cichlid, Parachromis dovii, is a species with a high potential for aquaculture in Central America; however, the knowledge of the digestive physiology in larvae period is limited. For these reason, this study evaluated ... -
Changes in the protein fraction of Merluccius Bilinearis muscle under lactic acid bacterial fermentation using a Lactobacillus Acidophilus starler culture.
(Universidad Nacional (Costa Rica), 1987-01-01)The effect of lactic acid bacterial fermentation on the protein fraction of Merluccius bilinearis muscle was evaluated. The non-protein fraction increased progressively with corresponding decreases in the percentage ... -
Characteristics of the spontaneous deposition of Sn in polycrystalline Pt
(2012-04)Spontaneous deposition of tin (Sn) in polycrystalline platinum (Pt pc) from a sulfuric acid solution of tin salts, was evaluated by conventional electrochemical techniques, to determine its characteristics. Tin was deposited ... -
Characteristics of the venoms and digestive secretions of Aphonopelma seemanni and Sphaerobothria hoffmanni (Araneae: Theraphosidae) of Costa Rica
(Universidad de Costa Rica, 1987)A comparison of some components of the venoms of two Costa Rican tarantulas, Aphonopelma seemanni (Cambridge) and Sphaerobothria hoffmanni (Karsch) by polyacrylamide gel electrophoresis shows patterns similar to those of ... -
Characterization of sandy beaches of the Southern Caribbean of Costa Rica
(Instituto Tecnológico de Costa Rica, 2021-07)Las zonas costeras son ambientes dinámicos que brindan múltiples servicios ecosistémicos. La influencia de factores naturales y antrópicos conducen cambios cada vez más drásticos, que generan impactos negativos en la ... -
Characterization of the coral communities and reefs ot two previously underscribed locations in the upwelling region of Gulf of Papagayo Costa Rica
(Universidad Nacional (Costa Rica), 2010)In the seasonal upwelling region of Gulf of Papagayo (Northern Pacific coast of Costa Rica), we evaluated and described two previously poorly known coral habitats, Punta Cacique and Bahía Guacamaya. Both localities differed ... -
Chemical tradeoffs in seed dispersal: defensive metabolites in fruits deter consumption by mutualist bats
(Oikos, 2015-09-08)Although fleshy fruits function primarily to attract seed dispersers, many animal‐dispersed fruits contain potentially toxic secondary metabolites. These metabolites can provide defense against seed predators and pathogens, ... -
Chromosome-Level Genome Reveals the Origin of Neo-Y Chromosome in the Male Barred Knifejaw Oplegnathus fasciatus
(Universidad Nacional (Costa Rica), 2020-04-24)The barred knifejaw, Oplegnathus fasciatus, is characterized by an X1X2Y system with a neo-Y chromosome for males. Here, a chromosome-level genome was assembled to investigate the origin of neo-Y chromosome to the male O. ... -
Cianobacterias bentónicas marinas en el Caribe central y sur de Costa Rica
(Universidad Nacional (Costa Rica), 2012-12)Las cianobacterias comprenden un grupo de microorganismos del dominio Bacteria (Woese et al. 1990) poco estudiado en Costa Rica. Los escasos trabajos realizados abordan temáticas relacionadas con la ocu-rrencia de ... -
Ciclo anual del fitoplancton en el lago de Rio Cuarto, Costa Rica
(Universidad Nacional [Costa Rica], 1989-01-01)El ciclo anual de fitoplancton y nutrientes (nitratos y ortofosfatos) del Lago Río Cuarto, Costa Rica, ha sido estudiado desde febrero de 1984 hasta marzo de 1985. Las muestras de agua se obtuvieron con un muestreador ... -
Citotaxonomía comparativa de tres especies de Cichlasoma (Pisces: Cichlidae) nativas de Costa Rica
(Universidad de Costa Rica, 1991)The karyotype oí three species oí CichlasofM: C. dOllii, C. managwmse and C. friedrichstali were studied. The number of diploid chromosomes is 2n=48 in the fust two species. Their karyotypes are composed of four pairs ... -
Cloning, purification and characterization of nigrelysin, a novel actinoporin from the sea anemone Anthopleura nigrescens
(Elsevier B.V., 2019)Actinoporins constitute a unique class of pore-forming toxins found in sea anemones that being secreted as soluble monomers are able to bind and permeabilize membranes leading to cell death. The interest in these proteins ... -
Cloning, purification and characterization of nigrelysin, a novel actinoporin from the sea anemone Anthopleura nigrescens
(Elsevier (Países Bajos), 2018-07-21)Actinoporins constitute a unique class of pore-forming toxins found in sea anemones that being secreted as soluble monomers are able to bind and permeabilize membranes leading to cell death. The interest in these proteins ... -
Coastal fisheries of Costa Rica
(Organización de las Naciones Unidas para la Alimentación y la Agricultura, 2011)Costa Rica is a small country, with a territory of 51 000 km2 (Figure 1). Due to the small and open economy, export of products is a major component in many industries, including fisheries. Joaquín and Windevoxhel (1998) ...