Ciencias básicas
Colecciones en esta comunidad
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Biología [455]
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Física [39]
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Geología [66]
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Matemática [37]
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Meteorología [202]
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Química [80]
Envíos recientes
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La viuda negra en Costa Rica: información general
(2016)La viuda café (Latrodectus geometricus) ha sido probablemente introducida a América desde la región mediterránea de África. Desde su llegada a Costa Rica, esta especie ha expandido su distribución rápidamente colonizando ... -
Lactrodectismo en Costa Rica
(2017)Se reporta un accidente causado por la araña Latrodectus geometricus, incluida en el grupo conocido como “viudas negras”, en Costa Rica. El accidente le ocurrió a una mujer de 27 años vecina de la ciudad de Cartago, en su ... -
Functional changes in web design along the ontogeny of two orb-weavers
(2017-08-01)Orb webs evolved primarily to capture prey, though they also have other functions. Recently, it has been argued that the orb web does not work as a functional unit, but instead some sections or components have presumably ... -
Dinámica de las aguas en la parte interna del Golfo de Nicoya ante altas descargas del Río Tempisque
(1998-06-14)Se estudió la dinámica de las aguas de la parte interna del Golfo de Nicoya ante grandes descargas de los ríos. Valores de 0 ppm fueron encontrados al norte de la Isla Chira representando los valores mas bajos reportados ... -
Algunas características de las tormentas tropicales y de los huracanes que atraversaron o se formaron en el Caribe adyacente a Costa Rica durante el período 1886-1988
(1996-01)Se estudian aslguans cracterísticas de las tormentas tropicales y de los huracanes en el Caribe adyacente a Costa Rica, en el área localizada entre 70-850 Oy 8-180 N. En particular, utilizando un registro para el período ... -
La Oscilación Cuasi-bienal, ENOS y acoplamiento de algunos parámetros superficiales y estratosféricos sobre Costa Rica
(1996-02)La Oscilación Cuasi-bienal (OCB) sobre Costa Rica se identifica claramente en la componente zonal del viento en 50 hPa con un período dominante de cerca de 29 meses. Las fases del este de la OCB parecen estar relacionadas ... -
1,1-Diphenyl-4-(thiophen-2-yl)but-3-yn-1-ol
(2018-11)The asymmetric unit of the title homopropargyl alcohol, C20H16OS, contains two independent molecules comprising a hydroxy group, a 3-(2-thiophenyl)- propargylic moiety and two aromatic rings linked to a central carbon atom. ... -
Climatología EMSO
(2018-12-10)En el siguiente archivo se registran los datos recopilados por la Estación Meteorológica de la Sede de Occidente (EMSO) de la Universidad de Costa Rica con series temporales en temperatura, viento, humedad relativa, ... -
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. ... -
Geometrical correlation indices using homological constructions on manifolds
(2018)Abstract The course of dimensionality is a common problem in statistics and data analysis. Variable sensitivity analysis methods are a well studied and established set of tools designed to overcome these sorts of problems. ... -
Crystal structure of (E)-2-(tert-butylamino)-4-(tertbutylimino)naphthalen-1(4H)-one
(2018)The title compound, C18H24N2O, is the first example of a naphthoquinone imine derivative isolated in the 4-imine/2-amine tautomeric form having bulky alkyl substituents at the N atoms. The molecular conformation is stabilized ... -
El Niño-Oscilación del Sur y algunas series de temperaturas máxima y brillo solar en Costa Rica
(1996-02)Some characteristics Of "El Niño-Southern Osciilation” (ENSO) and therr posible relationship with the space and time distribution of anomalies of monthly values of maximun temperature and sunshine hours are analysed for ... -
Dye‐sensitized Devices: Photovoltaic and Photoelectrolytic Applications
(2018-11)Dye‐sensitized approach along with stability and surface robustness in titanium dioxide (TiO2) against photocorrosion and degradation has been widely studied and applied in several important applications. This chapter ... -
Un método gráfico para el pronóstico de oleaje durante huracanes en el Caribe adyacente a Costa Rica
(1996-01)A simple graphic method for wave forecasting during the occurrence of hurricanes in the Caribbean adyacent to Costa Rica is presented. This method utilizes the basic parameters which are reported by the services of ... -
New data about the Costa Rican aphid fauna (Hemiptera, Aphididae)
(2012-12)New data about the Costa Rican aphid fauna (Hemiptera, Aphididae). Graellsia, 68(2): 305-312. Aphids were collected from 39 locations throughout Costa Rica, representing a wide altitudinal range, and from both crops and ... -
Greenidea psidii (Hemiptera: Aphididae: Greenideinae) New Invasive Aphid in Costa Rica
(2009-06)Greenidea (Trichosiphum) psidii van der Goot 1916 is recorded for the first time in Costa Rica and Central America. The species has been recorded on Psidium guajava, Psidium friedrichst halianum and Myrciaria cauliflora ... -
A new species of Rhopalosiphum (Hemiptera, Aphididae) on Chusquea tomentosa (Poaceae, Bambusoideae) from Costa Rica
(2012-01)The new species Rhopalosiphum chusqueae Pérez Hidalgo & Villalobos Muller, is described from apterous viviparous females caught on Chusquea tomentosa in Cerro de la Muerte (Costa Rica). The identity of the species is ... -
First report of Diaphorina citri (Hemiptera: Psyllidae) in Costa Rica
(2005-09)The Asian psyllid was reported in Rio de Janeiro, Brazil, by Costa Lima (1942) and by Catling (1970). In June 1998, the insect was detected in Florida and by September 2000 this pest had spread to 31 Florida counties ... -
Synthesis, structure and spectroscopic characterization of Ni(II), Co(II), Cu(II) and Zn(II) complexes with saccharinate and pyrazole
(2007-09)Four mononuclear mixed-ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II), with saccharin (sac) and pyrazole (Hpz) were synthesized and characterized on the basis of elemental analysis, FT-IR spectroscopy, magnetic ...
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