Browsing Artículos científicos by Title
Now showing items 325-344 of 555
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In vitro manipulation of egg activation in the open thelycum shrimp Litopenaeus
(Elsevier, 2007)This research was designed to develop a basis for the in vitro manipulation of egg activation in Litopenaeus. The timing and sequence of events associated with egg activation of three species of Litopenaeus: L. occidentalis, ... -
Incubación, pre-lisis y post-purificación en el rendimiento y pureza de ácidos nucleicos extraídos de sangre de cabras domésticas contenida en tarjetas FTA
(Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (México), 2022)Técnicas moleculares requieren extracciones de ácidos nucleicos en cantidad y pureza adecuadas. Este trabajo describe un modelo lineal generalizado (GLM) de un factor ajustado con efectos fijos sobre el rendimiento de ácido ... -
Indicadores ambientales de áreas verdes urbanas para la gestión en dos ciudades de Costa Rica
(2018-08)Abstract: Environmental indicators of urban green areas for management in two cities of Costa Rica. Environmental quality contributes to the physical and mental well-being of the population. In this way, the green areas ... -
Indicadores de proximidad a servicios urbanos en la ciudad de Heredia
(Universidad Nacional, Costa Rica., 2018)Esta investigación trata sobre la cuantificación del acceso que tienen los residentes de la ciudad de Heredia a algunos servicios básicos en la ciudad, a partir de la distancia a la que viven, calculando que porcentaje de ... -
Indicator - based management recommendations for an artisanal bottom - longline fishery in Costa Rica, Central America
(Universidad de Costa Rica, 2017)There is a growing need to strengthen the small-scale fishing sector with emerging governance methods that improve fishers’ threatened livelihoods. Therefore, this study’s aim was to develop management recommendations, ... -
Inducción al desove en hembras del pargo mancha, lutjanus guttatus (Steindachner, 1869)
(Universidad Nacional [Costa Rica ], 1998-01-01)Se estudió el efecto del extracto de pituitaria de carpa (EPC) en 6 hembras maduras de pargo mancha, L. guttatus, capturadas con línea por pescadores artesanales en el Golfo de Nicoya. El peso de las hembras varió de 1,7-2,0 ... -
Induced spawning and larval rearing of spotted rose snapper, Lutjanus guttatus, at the Marine Biology Station, Puntarenas, Costa Rica
(Universidad Autónoma de Baja California, 2008)Wild spotted rose snapper, Lutjanus guttatus (n = 400, 60–100 g), were captured and grown out in cages during one year (February 2001 to February 2002). When the mature stage was detected by cannula samples, females (n = ... -
Induction of ovarian maturation and spawning by combined treatment of serotonin and a dopamine antagonist, spiperone in Litopenaeus stylirostris and Litopenaeus vannamei
(Universidad Nacional, Costa Rica, 2004)The study was designed to develop a reliable technique for inducing ovarian maturation and spawning in Litopenaeus stylirostris and Litopenaeus vannamei, as an alternative to the traditional and destructive eyestalk ... -
Induction of sperm activation in open and closed thelycum penaeoid shrimps
(Aquaculture vol.216 no.1-4 371-381 2003, 2003)A modified egg water (EW) technique for in vitro induction of sperm activation was applied to Trachypenaeus byrdi, Xiphopenaeus riveti (closed thelycum shrimps), and Litopenaeus occidentalis (open thelycum) from a tropical ... -
Influence of oceanographic conditions on nesting abundance, phenology and internesting periods of east Pacific green turtles
(Springer Verlag, 2019)Sea turtles are migratory animals that travel from foraging grounds to specifc nesting beaches every few years and that, therefore, can be infuenced by oceanographic conditions in several diferent habitats. We assessed ... -
Influencia de las competencias emocionales de docentes de Ciencias Naturales en la adquisición de las habilidades emocionales de los estudiante. El caso de un colegio secundario en Costa Rica
(Facultad de Psicología de la Universidad Michoacana de San Nicolás de Hidalgo, 2015)Este artículo socializa los resultados de una investigación sobre la influencia que tienen las competencias emocionales (conciencia, regulación y autonomía) de algunos docentes de física, química y biología, en la manifestación ... -
Influencia del pez León (Pterois miles y Pterois volitans) en la cadena de valor de la pesca artesanal, Caribe sur de Costa Rica
(Universidad Estatal a Distancia (Costa Rica), 2019-08-23)“Lionfish (Pterois miles and Pterois volitans) influence on the artisanal fishing value chain, Southern Caribbean of Costa Rica”. Introduction: The “Lionfish” are actually two invasive species that occur in several parts ... -
Infuence of soil characteristics on physiological and growth responses of Cytharexyllum myrianthum Cham. (Verbenaceae) to fooding
(Springer Science and Business Media Deutschland GmbH, 2020-10-27)The success of watershed riparian forest restoration programs can be afected by the selection of plant species tolerant to fooding and soil types that occur along water courses. We evaluated physiological and growth ... -
Los inicios y primeros logros de la red UNA STEM
(Universidad de la Laguna (España), 2022)La Red UNA STEM es una propuesta de varias personas académicas de la Facultad de Ciencias Exactas y Naturales y Facultad de Ciencias de la Tierra y el Mar de la Universidad Nacional (UNA), que tiene como objetivo permear ... -
Insecticidal activity of ethanolic plant extracts on Aedes aegypti larvae
(Universidad Nacional (Costa Rica), 2023-06-01)The objective of this study was to determine the larvicidal activity against A. aegypti of ethanolic extracts of plants commonly found in Costa Rica. [Methodology] Larvicidal activity of ethanolic extracts of plants was ... -
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, ...
