Listar Ciencias básicas por título
Mostrando ítems 1807-1826 de 3078
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Micropropagation and genetic transformation of Spanish Cedar (Cedrela odorata L.): A Review
(2019-05)Cedrela odorata L. (Meliaceae) is a timber tree of high economic value. Currently, this species faces serious problems due to selective cutting and environmental degradation, which together have contributed to the decline ... -
Microwave assisted synthesis: A Mn/Ni reaction system affording Mn5Ni4, Mn2Ni2 and Mn7 complexes
(2013-11)Following our interest in microwave assisted synthesis in coordination chemistry; we report here the results of the study of a mixed metal Mn/Ni system under common bench-top conditions and using the microwave reactor. ... -
Microwave-Assisted Extraction of Chloride Followed by Ion Chromatography as an Alternative to the ASTM D6470 Method for the Determination of Crude Oil Salinity
(2020)The presence of chloride in crude oil can result in a number of drawbacks, with technical and economic impacts on the production of petroleum derivatives. For this reason, it must be carefully monitored in this kind of ... -
Micrurus Nigrocinctus (Central America Coralsnake) Predation
(2019)Coral snakes and their mimics are rarely preyed upon by birds. Turquoise-browed Motmots and Great KisKadees, wich feed on snakes and other reptiles, avoid models with the patterns of coral snakes or their mimics. Howerver, ... -
Minimum depth of double cross product extensions
(2020)In this paper we explore minimum odd and minimum even depth sub- algebra pairs in the context of double cross products of finite dimensional Hopf algebras. We start by defining factorization algebras and outline how subring ... -
Mionecrosis, hemorragia y edema inducidos por el veneno de Bothrops asper en ratón blanco
(1980)Pathogenesis of the myonecrotic, hemorrhagic and edema-forming effects in white mice inoculated with Bothrops asper venom was studied at different time intervals by means of light microscopy, determination of serum levels ... -
Mis memorias sobre Robert L. Dressler (1927 - 2019): Botánico y ser humano extraordinario
(2020)Se presenta un texto biográfico y una valoración de la extensa obra científica del botánico Robert L. Dressler, que dedicó la mayor parte de su vida y su esfuerzo al estudio sistemático y taxonómico de las orquídeas, ... -
Misidentification of Bellator gymnostethus (Gilbert, 1892) as Prionotus ruscarius Gilbert & Starks, 1904 (Scorpaeniformes: Triglidae)
(2020-09-14)The checklist by Robertson et al. (2017) of fishes from the tropical eastern Pacific included information on three members of the family Triglidae: Bellator loxias (Jordan, 1897), Prionotus ruscarius and P. stephanophrys ... -
Mixomicetes asociados con Avicennia germinans y Laguncularia racemosa en el manglar del Amatal, El Salvador
(2022)Los estudios de mixomicetes en ecosistemas de manglar no son comunes; principalmente se han llevado a cabo en Brasil. En esta investigación, se realizó el primer muestreo de mixomicetes asociados a dos especies de ... -
Mixomicetes del Cerro Buenavista – Macizo de la Muerte, Talamanca
(2004-01-01)Se incluye un listado con descripciones de especies de mixomicetes del Cerro Buenavista (Cerro de la Muerte). El listado incluye una clave dicotómica y un glosario. -
Model integration for assessing future hydroclimate impacts on water resources, agricultural production and environmental quality in the San Joaquin Basin, California
(2004-03)The US National Assessment of the Potential Consequences of Climate Variability and Change provides compelling arguments for action and adaptive measures to help mitigate water resource, agricultural production and ... -
Modelación numérica de los acuíferos costeros de Playa Potrero y Playa Brasilito, Santa Cruz de Guanacaste
(2022)Se actualiza el modelo hidrogeológico de los acuíferos costeros de Playa Potrero y Playa Brasilito, así como sus parámetros hidráulicos. Estos acuíferos son conformados por rocas del Complejo de Nicoya en su basamento y ... -
Modelado de la concentración de partículas PM10 en Costa Rica mediante el uso del modelo WRF-Chem
(2020-03-18)RESUMEN En el presente trabajo de investigación se analizan, por primera vez en el país, los niveles de concentración de PM10, utilizando simulaciones numéricas realizadas con el modelo WRF (Weather Research and ... -
Modelado del espacio-tiempo en el interior de una estrella de neutrones en rotación con un cuadrupolo agregado de forma perturbativa
(2021-11-07)The potentials and multipolar parameters for a neutron star internal space-time model are calculated in a perturbative series using the angular velocity as perturbation parameter. Twelve equations of state are considered, ... -
Modelado geofísico mediante el uso del método de refracción sísmica, del área comprendida por los Sitios de Presa Electriona y Belén, Heredia, Costa Rica.
(2014-03-12)Los sitios de Presa Electriona y Belén poseen alrededor de los 100 años de antigüedad desde su construcción en 1922 y 1911 respectivamente; en los últimos años se ha evidenciado un constante incremento en el deterioro ... -
Modelado numérico en el Valle Central Occidental de Costa Rica durante el invierno boreal: sensibilidad al esquema de capa límite
(2021)El clima en el Valle Central Occidental (VCO) de Costa Rica está influenciado, entre otros aspectos, por la variación en la intensidad y la dirección de los vientos a diferentes escalas temporales y espaciales. En este ... -
Modeling the university drinking culture phenomenon
(2022-11-03)We study a susceptible-drinker-recovered (SDR) model for the drinking culture phenomenon in university atmospheres. We find conditions for this model to have extinction and endemic equilibrium points. We analyze different ... -
Modelling non‐stationary water ages in a tropical rainforest: A preliminary spatially distributed assessment
(2020)Pristine tropical forests play a critical role in regional and global climate systems. For a better understanding of the eco-hydrology of tropical “evergreen” vegetation, it is essential to know the partitioning of water ... -
Modelling SPECT auto-contouring acquisitions for 177Lu & 131I molecular radiotherapy using new developments in Geant4/GATE
(2022)Purpose Monte Carlo modelling of SPECT imaging in Molecular Radiotherapy can improve activity quantification. Until now, SPECT modelling with GATE only considered circular orbit (CO) acquisitions. This cannot reproduce ...