Browsing Facultad de Ciencias Exactas y Naturales by Title
Now showing items 2385-2404 of 2590
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Spatial variation of physicochemical parameters in a constructed wetland for wastewater treatment: An example of the use of the R programming language
(Universidad Estatal a Distancia (Costa Rica), 2021-06)Introduction: The implementation of wastewater treatment systems such as constructed wetlands has a growing interest in the last decade due to its low cost and high effectiveness in treating industrial and residential ... -
Species diversity and distribution of genus Pampus (Pelagiaria: Stromateidae) based on global mitochondrial data
(Universidad Nacional (Costa Rica), 2022-12-13)Due to the highly similar external morphology of the Pampus species, misidentifications frequently occur and hinder the understanding of the taxonomy and species distributions of the genus. In this study, we generated 271 ... -
Spontaneous spawning in captivity of the first generation hatchery-produced weakfish, Cynoscion squamipinnis (Perciformes: Sciaenidae)
(Universidad Nacional (Costa Rica), 2017-01)The aim of this study was to evaluate the spontaneous spawning of the first generation of weakfish (Cynoscion squamipinnis) reared in captivity in order to conduct restocking programs and mariculture projects. Juveniles ... -
Spontaneous spawning, ontogeny and growth in captivity of Cynoscion squamipinnis
(Universidad de Costa Rica, 2016-09-03)The croakers or drums are commercial species, which have been overfished in the Nicoya Gulf, Costa Rica. This study aimed to describe, for the first time, the reproduction and the ontogeny of weakfish, Cynoscion squamipinnis ... -
Spotted rose snapper (Lutjanus guttatus) aquaculture research and development as socio-economic alternative for Costa Rican fishing communities
(2010-06-01)The spotted rose snapper (Lutjanus guttatus) is one of the main target coastal species, but landings are decreasing in quantity and size. Reports include a mean capture size of 50 cm with gill nets and 38 cm with bottom ... -
Stable isotopes reveal groundwater to river connectivity in a mesoscale subtropical watershed
(Taylor and Francis Ltd., 2021)The Corumbataí River basin (São Paulo, Brazil) has a critical situation regarding water availability due to the intensive use to support agriculture and urbanization, requiring scientific information to face water demand. ... -
Stable isotopic characterizacion of nitrate wet deposition in the tropical urban atmosphere of Costa Rica
(Springer, 2021-07-13)Increasing energy consumption and food production worldwide results in anthropogenic emissions of reactive nitrogen into the atmosphere. To date, however, little information is available on tropical urban environments where ... -
Stable isotopic characterization of nitrate wet deposition in the tropical urban atmosphere of Costa Rica
(Research Square, 2021)Increasing energy consumption and food production worldwide results in anthropogenic emissions of reactive nitrogen into the atmosphere. To date, however, little information is available on tropical urban environments where ... -
Strategy of bioremediation in recirculating aquaculture systems using constructed microbial mats
(Journal of Chemical, Biological and Physical Sciences, 2014-11-30)Due to strict international standards, every day there is greater interest in developing environmentally sound treatment systems in aquaculture facilities that can remove contaminants from effluent and allows for the reuse ... -
Student Camps to Promote Scientific Vocations in STEM: The Quimi Camp Case
(Universidad Nacional (Costa Rica), 2023-06-01)[Objetivo] Desde el año 1988 y hasta el año 2018, el estudiantado de secundaria en Costa Rica debía aprobar un examen final para graduarse de la escuela secundaria, y ser elegible para una educación universitaria pública. ... -
LAS SUGERENCIAS METODOLÓGICAS PARA LA ENSEÑANZA DE LA ARITMÉTICA EN EDUCACIÓN PRIMARIA EN COSTA RICA A FINALES DEL SIGLO XIX
(Reunión Latinoamericana de Matemática Educativa, 2018)El estudio que se presenta tiene como objetivo caracterizar la enseñanza de la aritmética en la Educación Primaria en Costa Rica en los albores de la fundación de la Escuela Normal en el siglo XX. Para esto, se analizan ... -
Supply and Demand of Human Resources in Computer Sciences in Costa Rica For Whom the Bell Tolls
(Infonomics Society, 2018)We analyze in this paper the supply and demand of human resources in computer sciences (CS) in Costa Rica. This is done with the aim of validating claims made by the local media about a large deficit of professionals for ... -
Surface-Water Quality of the Gulf of Papagayo, North Pacific, Costa Rica
(Universidad Nacional, Costa Rica, 2021-08-25)In recent years, the northwestern part of the North Pacific areas of Costa Rica has undergone rapid socioeconomic development. This situation, combined with the scarce available information about the water quality of the ... -
Sustainability assessment based on stakeholders’perceptionof tourism activities in Loreto Bay National Park, Mexico
(Centro de Investigación en Alimentación y Desarrollo, A. C, 2022-11-22)Objective: To assess the level of sustainability, based on stakeholders’ tourism perceptions of Loreto Bay National Park (LBNP) in Mexico. Methodology: Indicators were selected and organized in three components: (1) ... -
Synthesis of a metal chelating monomer for radiation polymer dosimetry
(Elsevier Ltd, 2021-03)To enhance the performance of polymeric dosimeters it is necessary to design novel formulations considering the mechanisms that register the absorbed dose (e.g. induced polymerization) and the readout method. The combination ... -
Synthesis of Dihydroindolo[2,3-c]carbazole as Potential Telomerase Inhibitor
(Journal of Heterocyclic Chemistry vol.53 no.3 762-766 2015, 2015-05-27)The dictyodendrins A-E were the first marine natural products that show inhibition of telomerase. A versatile and convergent route was described for the synthesis of derivatives of these pyrrolo[2,3-c]carbazole alkaloids ... -
Taller Creando la ecuación de la circunferencia. CONCITES. XIII FIMAT 2022
(Universidad Nacional (Costa Rica), 2022-09-02)El fortalecimiento de la Geometría Analítica en el currículo de secundaria costarricense ha traído la necesidad de contar con herramientas didácticas y nuevas metodologías, para desarrollar en los estudiantes las ... -
Taller de programación con circuitos
(Universidad Nacional de Ingeniería Managua (Nicaragua), 2021)El taller les permite a las personas participantes conocer el software Tinkercad y la placa Arduino con el fin de hacer que la programación con circuitos sea accesible para todos -
Tamaño poblacional, distribución y uso de habitat de dos especies simpatricas de delfines en el refugio nacional de vida silvestre Gandoca - Manzanillo Costa Rica
(Universidad Nacional (Costa Rica), 2009)Alrededor de 30 especies de cetáceos habitan aguas costarricenses, pero solamente seis especies han sido confirmadas para la costa Caribe de Costa Rica. Las dos especies costeras más comunes son el delfin de Guyana (Sotalia ... -
Tamaños y proporción sexual de Ucides occidentalis (Crustacea: Gecarcinidae) en un manglar de Costa Rica
(Universidad Nacional (Costa Rica), 1995-02-22)Sizes and sex ratios of Ucides occidentalis (ORT-MANN 1897) were studied in the mangrove area of Estero Panama, Guanacaste, Costa Rica, from March to August 1982. The caparace length was 36.7-84.5 mm for males and 36.00-60.8 ...