Now showing items 113-132 of 171

    • Landscape-scale controls on aboveground forest carbon stocks on the Osa Peninsula, Costa Rica 

      Taylor, Philip; Asner, Gregory; Dahlin, Kyla; Anderson, Christopher; Knapp, David; Martin, Roberta; Mascaro, Joseph; Chazdon, Robin; Cole, Rebecca; Wanek, Wolfgang; Hofhansl, Florian; Vilchez-Alvarado, Braulio; Townsend, Alan; Malavassi-Ortíz, Edgar (Public Library of Science, 2015-06)
      Tropical forests store large amounts of carbon in tree biomass, although the environmental controls on forest carbon stocks remain poorly resolved. Emerging airborne remote sensing techniques offer a powerful approach to ...
    • Learning styles comparison based on a classification methodology 

      Solís-Céspedes, Jacqueline; Espinoza-Guzmán, Julia (IEEE, 2017)
      Learning styles have been used to explain students’ differences in approaching their learning, but there are still deficiencies in interpreting the results of their application, and there are authors that indicate that ...
    • Low back pain among office workers in three Spanish-speaking countries: Findings from the CUPID study 

      Campos-Fumero, Adriana; Delclos, George; Douphrate, David; Felknor, Sarah; Vargas-Prada, Sergio; Serra, Consol; Coggon, David; Ruiz- De Porras, David Gimeno (Instituto Tecnológico de Costa Rica. Escuela de Ingeniería en Seguridad Laboral, 2017)
      Objectives—To assess differences in the prevalence and incidence of low back pain (LBP) and associated disability among office workers in Costa Rica, Nicaragua and Spain. Methods—Data were collected at baseline (n=947, ...
    • Micropropagación de chayote (Sechium edule) a partir de brotes vegetativos 

      Ramírez, Carlos; Engelmann, Florent; Abdelnour-Esquivel, Ana (2002)
      Micropropagation of waterpear (Sechium edule Jacq. S.W.) from vegetative shoots. Waterpear (Sechium edule) is an important source of revenue for the exporting countries, being Costa Rica the leading producer. Among the ...
    • Micropropagación de Pilón (Hieronyma Alchorneoides) 

      Abdelnour-Esquivel, Ana; Valverde, Lissette; Aguilar, Mª Elena (2011)
      Micropropagation of pilon (Hieronyma alchorneoides). Pilon (Hieronyma alchorneoides) (Euphorbiaceae) is one of the native timber species of Costa Rica best adapted to conditions of open plantation. Due to its growth ...
    • Micropropagación de teca (Tectona grandis L.f) 

      Abdelnour-Esquivel, Ana; Muñoz, Anabelle (2005)
      Micropropagation of teak (Tectona grandis L.f.). Teak (Tectona grandis L.f.) is considered valuable due to the quality of its wood. The world level demand for the wood supported the establishment of commercial plantations. ...
    • Micropropagación masiva de Stevia Rebaudiana Bertoni en sistemas de inmersión temporal 

      Alvarenga-Venutolo, Silvana; Salazar-Aguilar, Tatiana (Revista Cultivos Tropicales, 2015)
      Stevia rebaudiana Bertoni, Asteraceae, is a natural sweetener called “Stevia”. Its properties came from the diterpenoid glycosides presented in the leaves: a stevioside and rebaudisioside. The percentage of seed ...
    • Micropropagación y organogénesis in vitro de Gloxinia sp. 

      Alvarenga-Venutolo, Silvana; Abdelnour-Esquivel, Ana (2002)
      Se estableció un protocolo para la micropropagación de gloxinia y se evaluó en cinco fenotipos. Se realizó un estudio histológico al microscopio electrónico de barrido para determinar el origen de los brotes producidos, ...
    • Mineral content in relation to radial position, altitude, chemical properties and density of persian ironwood 

      Kiaei, Majid; Kord, Behzad; Chehalmardian, Ahmad; Farsi, Mohammad; Moya-Roque, Róger (Universidade Federal de Sao Carlos, 2015)
      Persian ironwood (Parrotia persica) is native species from Iran and covers 10,54% of the commercial volume. Its wood structure and its chemical composition are affected by growth conditions. The aim of the study was to ...
    • Model reduction of a flexible-joint robot: a port-Hamiltonian approach 

      Jardón-Kojakhmetov, Hildeberto; Muñoz-Arias, Mauricio; Scherpen, Jacquelien (IFAC-PapersOnLine, 2016)
      In this paper we explore the methodology of model order reduction based on singular perturbations for a flexible-joint robot within the port-Hamiltonian framework. We show that a flexible-joint robot has a port-Hamiltonian ...
    • Molecular characterization and genetic diversity of Jatropha curcas L. in Costa Rica 

      Vásquez-Mayorga, Marcela; Fuchs, Eric; Hernández, Eduardo; Herrera, Franklin; Hernández, Jesús; Moreira-González, Ileana; Arnáez-Serrano, Elizabeth; Barboza, Natalia (2017)
      We estimated the genetic diversity of 50 Jatropha curcas samples from the Costa Rican germplasm bank using 18 EST-SSR, one G-SSR and nrDNA-ITS markers. We also evaluated the phylogenetic relationships among samples using ...
    • Molecular characterization of two accessions of Cydonia oblonga 

      Alvarado-Marchena, Luis; Flores-Mora, Dora María; Chacón-Cerdas, Randall; Schmidt-Durán, Alexander; Alvarado-Ulloa, Carlos (Revista Agronomía Mesoamericana, 2015)
      The purpose of this research was to evaluate the plastid trnH-psbA spacer and the matK coding sequence as possible markers for the molecular characterization in two accessions of quince (C. oblonga), one from Argentina and ...
    • Molecular identification of Trichoderma spp. in garlic and onion fields and In Vitro antagonism trials on Sclerotium cepivorum 

      Alvarado-Marchena, Luis; Rivera-Méndez, William (Revista Brasileira de Ciencia do Solo, 2016)
      Trichoderma species are non-pathogenic microorganisms that protect against fungal diseases and contribute to increased crop yields. However, not all Trichoderma species have the same effects on crop or a pathogen, whereby ...
    • Morphometric comparison by the ISAS® CASA-DNAf system of two techniques for the evaluation of DNA fragmentation in human spermatozoa 

      Sadeghi, Sara; García‑Molina, Almudena; Celma, Ferran; Fereidounfar, Sogol; Soler, Carles; Valverde-Abarca, Anthony (Instituto Tecnológico de Costa Rica. Escuela de Agronomía. Sede San Carlos., 2016)
      DNA fragmentation has been shown to be one of the causes of male infertility, particularly related to repeated abortions, and different methods have been developed to analyze it. In the present study, two commercial kits ...
    • Morphometry and subpopulation structure of Holstein bull spermatozoa: Variations in ejaculates and cryopreservation straws 

      Arenán, Héctor; Sancho, María; Contell, Jesús; Yániz, Jesús; Fernández, Alejandro; Soler, Carles; Valverde-Abarca, Anthony (2016)
      Sperm quality is evaluated for the calculation of sperm dosage in artificial reproductive programs. The most common parameter used is motility, but morphology has a higher potential as a predictor of genetic quality. ...
    • Not-from-concentrate pilot plant ‘Wonderful’ cultivar pomegranate juice changes: Volatiles 

      Obando-Ulloa, Javier; Beaulieu, John C. (Elsevier, 2017)
      Pilot plant ultrafiltration was used to mimic the dominant U.S. commercial pomegranate juice extraction method (hydraulic pressing whole fruit), to deliver a not-from-concentrate (NFC) juice that was high-temperature ...
    • OGM: caso de papa y manzana que no se oxida 

      Garro-Monge, Giovanni; Méndez, Laura (Cámara Costarricense de la Industria Alimentaria., 2016-09)
      Genetically modified organisms are those foods that are improved through biotechnology, where they are modified from one to four genes by genetic engineering. Producing these products improves traits such as nutritional ...
    • On the Significance of Leaf Sides in Automatic Leaf-based Plant Species Identification 

      Carranza-Rojas, José; Mata-Montero, Erick (IEEE, 2016-11)
      Because the front side of a leaf and the underside are functionally very different – the former captures sunlight to produce photosynthesis and the latter absorbs carbon dioxide and releases oxygen and vapor – they typically ...
    • Optical performance of finished and unfinished tropical timbers exposed to ultraviolet light in the field in Costa Rica 

      Moya-Roque, Róger; Vargas-Fonseca, Lupita; Salas-Garita, Cynthia (Wood Material Science & Engineering, 2016)
      This study evaluated wood color change (ΔE*) and the surface quality in 10 tropical wood species painted with three finishes (composed of wax and polyurethane). Two weathering conditions were tested: natural weathering ...
    • Overcoming obstacles to sharing data on tree allometric equations 

      Cifuentes-Jara, Miguel; Matieu, Henry; Réjou-Méchain, Maxime; López, Omar; Wayson, Craig; Michel-Fuentes, José María; Castellanos-López, Edwin; Zapata-Cuartas, Mauricio; Piotto, Daniel; Alice-Guier, Federico; Castañeda-Lombis, Héctor (Springer-Verlag France, 2015-09)
      Advances in ecology face the complexity of ecosystems with dynamics longer than a single scientist’s career. In forestry and REDD+ practice, in particular, our ability to understand forest ecosystem dynamics and to manage ...