Listar Ciencias básicas por título
Mostrando ítems 1789-1808 de 3130
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Mathematical and Statistical models as tools for the control ofmosquito-borne diseases: The experience of Costa Rica
(2021-06-25)The modeling of infectious diseases provides valuable input in the development of mitigating strategies and implementation of public health interventions. We highlight results and current research conducted in Costa Rica ... -
Mating and aggressive behaviour of Brachyrhaphis olomina (Cyprinodontiformes: Poeciliidae)
(2017)Despite the increasing interest in the use of intro-mittent male genitalia and coercive mating behaviour in poeciliids, detailed studies of the mating behaviour of most species in this family are lacking. We describe here ... -
Mating system and pollen flow between remnant populations of the endangered tropical tree, Guaiacum sanctum (Zygophyllaceae)
(2011)Tropical trees are generally long-lived making it difficult to assess the long-term effects of habitat fragmentation on genetic diversity. Maintenance of genetic diversity in fragmented landscapes is largely dependent on ... -
Mating System of the Tent-Making Bat Artibeus watsoni (Chiroptera: Phyllostomida
(2008-12)Vertebrate mating systems are influenced by ecological and phylogenetic factors, and the variation observed in mating behavior is frequently attributable to the extent to which male assistance in the rearing of offspring ... -
Matisia Tinamasiiana (BOMBACACEAE): una nueva especie arborescente del Pacífico Central de Costa Rica
(1998)El conocimiento de la Flora de Costa Rica ha sido, en gran parte, producto de la investigación y exploración botánica realizada principalmente dentro de las áreas protegidas estatales o privadas. Las áreas fuera de los ... -
Maxillaria sanguinea f. exsanguis f. nov. A new and rare form of an attractive species of Maxillaria (Orchidaceae)
(2020-05)A new form of Maxillaria sanguinea with pale, yellowish and white flowers, is described from Costa Rica as f. exsanguis, and a composite illustration of the new taxon is provided. -
Maxillaria, an unfinished monograph.
(2012)The genus Maxillaria is a large and tediously diverse genus of orchids from throughout the Neotropics, ranging from the U.S.A. (Florida) to Bolivia and the West Indies. Estimates put the number of species in the genus ... -
Maxillariella vulcanica
(2017)Maxillariella vulcanica is recognized by the ascending habit, slender cane-like stems bearing few, ellipsoid pseudobulbs. The flowers are white, diversely su used and spotted with pink, the lip bears a conspicuous callus ... -
Measurement of raindrop size distributions in tropical rain at Costa Rica
(2006)This paper presents the results of a unique opportunity of analyzing a large dropsize- distribution (DSD) sample. Using a well calibrated Optical Spectro Pluviometer sensor for measuring 1-min DSDs, a sample of one year ... -
Mecanismo de acción de miotoxinas aisladas de venenos de serpientes
(1984)Biochemically and pharmacologically, myotoxins isolated from snake venoms can be placed in four main groups: myolaxic phospholipases A, low molecular weight basic toxins, cardiotoxins, and hemorrhagic myotoxins. The myotoxic ... -
Mecanismos de tolerancia al arsénico en Justicia pectoralis var. Pectoralis (Acanthaceae): captación, reducción y desintoxicación
(2022)El arsénico es uno de los elementos más tóxicos liberados al ambiente, lo que lo convierte en una amenaza para los ecosistemas y la salud humana. Justicia pectoralis es una planta herbácea de rápido crecimiento y tolerante ... -
Mecanismos generadores de sequías prolongadas en el Corredor Seco Centroamericano
(2020)El Corredor Seco Centroamericano es una zona de alta vulnerabilidad hídrica y socioeconómica, propensa a la ocurrencia de extensas de sequías afectando severamente a más de 10 millones de personas. La comprensión de la ... -
Medfly courtship duration: a sexually selected reaction norm changed by crowding
(Ethology Ecology & Evolution 10: 369-382, 1998, 1998-10)The evolutionary effects of crowding on male courtship behavior were studied using wild and mass-reared medflies. Mass-reared strains had been raised under highly crowded conditions in mass-rearing facilities for ... -
Medicinal plants popularly used for gastrointestinal disorders in Costa Rican Central Valley
(2004)Abstract : A survey was conducted of medicinal plants for gastrointestinal disorders used by inhabitants of the Central Valley in Costa Rica by means of interviews with medicinal plant vendors of the central markets of the ... -
Mediciones climáticas de humedad del aire en los trópicos, con termistores y la ecuación sicrométrica
(1997)Electronic devices for air humidity measurements with hygroscopic capacitance sensors were tested for periods longer than a year under tropical conditions in Costa Rica. Some of the, showed a calibration drift that produced ... -
Medición y cálculo del índice ultravioleta en Costa Rica
(2014-12)Este trabajo de investigación pretende hallar una técnica para estimar los valores del índice ultravioleta, con los datos medidos de la radiación solar ultravioleta-B (UV-B) para San José, Costa Rica. El índice ultravioleta ... -
El Mega-Niño de 1877-1878 y su impacto social en Costa Rica
(2016-01)El presente trabajo analiza el impacto social que tuvo el evento del Mega-Niño de 1877-1878 en Costa Rica, a partir de la comparación de datos de sequías, lluvias, plagas de langostas y epidemias, recopilados de fuentes ... -
Megaherbivore exclusion led to more complex seagrass canopies and increased biomass and sediment Corg pools in a tropical meadow
(2022)In some regions of the Caribbean Sea, seagrasses have been negatively affected by sea turtle overgrazing. Seagrass canopy complexity has declined at a long-term monitoring site in Costa Rica. We deployed megaherbivore ... -
Meiotic Chromosome Behavior and Capsule Setting in Doritaenopsis Hybrids
(J. AMER. SOC. HORT. SCI. 133(1):107–116. 2008, 2008-10-06)The development of new cultivars in Doritaenopsis Guillaum. & Lami orchids is often hindered by factors such as low seed count in hybrids. Cytological study may offer the ability to develop new hybrids by revealing cultivars ... -
Member and Bayesian mixing models consistently indicate near‐surface flowpath dominance in a pristine humid tropical rainforest
(2021)The impacts of forest conversion on runoff generation in the tropics have received much interest, but scientific progress is still hampered by challenging fieldwork conditions and limited knowledge about runoff mechanisms. ...