Listar Ciencias básicas por título
Mostrando ítems 1701-1720 de 3121
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Large isotropic negative thermal expansion above a structural quantum phase transition
(2015-10-01)Perovskite structured materials contain myriad tunable ordered phases of electronic and magnetic origin with proven technological importance and strong promise for a variety of energy solutions. An always-contributing ... -
Large-scale climatic phenomena drive fluctuations in macroinvertebrate assemblages in lowland tropical streams, Costa Rica: The importance of ENSO events in determining long-term (15y) patterns
(2019-02-08)Understanding how environmental variables influence the distribution and density of organisms over relatively long temporal scales is a central question in ecology given increased climatic variability (e.g., precipitation, ... -
Larval aggression is independent of food limitation in nurseries of a poison frog
(2016)Aggression between nurserymates is common in animals and often hypothesized to result from proximate resource limita- tion. In numerous terrestrial frogs, larvae develop in phytotelmata, tiny water bodies where resources ... -
Latitudinal Profiles of Seasonal Rainfall-Enso Association along the Coast of Central and South America, Using Contingency Tables
(2011)The Influence of the ENSO events over the west coast of Central and South America (22oN - 45S) precipitation was investigated using Pearson's association index and a generalized logit models. Data consisted on a couple ... -
Latrodectism in 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 ... -
La Specklinia (Orchidaceae) con señuelo, una asombrosa nueva especie de los Andes occidentales en Colombia
(2018)Se describe e ilustra una nueva especie de Specklinia perte- neciente al subgénero Acostaea de los Andes occidentales de Colombia. Specklinia caulophryne está relacionada con S. campylotyle, pero puede distinguirse fácilmente ... -
Leaf and flower essential oil compositions of Gliricidia sepium (Fabaceae) from Costa Rica
(2015-04)Gliricidia is a small genus of flowering plants in the Fabaceae family. Gliricidia sepium is a multipurpose tree native to Mesoamerica and possibly northern South America. The chemical composition of the hydrodistilled ... -
Leaking elastic capacitor as model for active matter
(2021-05-24)We introduce the “leaking elastic capacitor” (LEC) model, a nonconservative dynamical system that combines simple electrical and mechanical degrees of freedom. We show that an LEC connected to an external voltage source ... -
Lepanthes arenasiana (Orchidaceae: Pleurothallidinae), a new species from Costa Rica
(2010-01)Lepanthes arenasiana from the Talamanca range in Costa Rica is described and illustrated. It is most similar to L. lancifolia but differs in having denticulate sepals, the petals with the upper lobe oblong, narrowing at ... -
Lepanthes aures‐ursinae and L. vertebrata spp. nov. (Orchidaceae: Pleurothallidinae) from Panama
(2017)Panama is still far from completing its orchid flora inventories, where large genera such as Lepanthes (Pleurothallidinae) reveal novelties regularly. Here, we describe and illustrate two new species of Lepanthes. Lepanthes ... -
Lepanthes elusiva – a New Species of Lepanthes (Orchidaceae: Pleurothallidinae) from Tapantí Area in Cartago, Costa Rica and a Glance to Other Species of the Genus in a Small Area Around the Río Grande de Orosi in Costa Rica
(2019)With about more than 120 species, Lepanthes is one of the most species-rich orchid groups represented in Costa Rica. Here, we describe and illustrate a new species from the Tapantí National Park, a megadiverse area in ... -
Lepanthes Sw. [with three new species from Costa Rica]
(2022-02)The genus Lepanthes in Costa Rica is presented and discussed. Three new species (Lepanthes sol Pupulin, L. victoria Pupulin & Bogarín, and L. marta-herraae Bogarín & Pupulin) are described and illustrated. -
Letters to the Editor. Rebuttal to Sauleda
(2019)In the Orchids issue for May of this year, Rubén Sauleda and Claudia Elena Gutiérrez commented on a few points of a book review I wrote for the second volume of Orchids, a Colombian Treasure, by Pedro Ortiz Valdivieso ... -
Ley de grandes números en medio ambiente aleatorio
(2020)Las condiciones (T)γ,γ ∈ (0,1) introducidas por Sznitman en 2002 tienen un significante impacto en el estudio de caminatas aleatorias sobre medios aleatorios (RWRE) . Este tipo de caminatas modelan, por ejemplo, el movimiento ... -
Licaria caribaea (Lauraceae): A New Species from the Caribbean Lowlands of Costa Rica
(1999)Una Licaria (Lauraceae) de las tierras bajas del Caribe costarricense se describe y se ilustra en este artículo. -
Life cycle and in vitro sporulation dynamics of Corinectria constricta, the causal agent of Pinus radiata stem canker, in Chile
(2020-04-07)In 2008, a canker disease caused by the fungus Corinectria constricta was detected in southern Chile. The causal agent was previously identified as Neonectria fuckeliana (now Corinectria fuckeliana), which has been associated ... -
Life history of five small minnow mayflies (Ephemeroptera: Baetidae) in a small tropical stream on the Caribbean slope of Costa Rica
(2009)Life history characteristics of five species of Baetidae were investigated over a one-year period at Quebrada Gonza´ lez, a warmwater stream in Braulio Carrillo National Park. Larvae of three species of Baetodes and two ... -
Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling
(2016)Cuticles of some Chrysina scarabs are characterized by flat, graded, and twisted structures of nanosized chitin fibrils. As inferred from SEM images, each species has its own spatial period or pitch P which is dependent ... -
Lissothuria caboblanquensis n. sp., a new species of sea cucumber (Holothuroidea: Dendrochirotida: Psolidae) from Costa Rica
(2014-05-23)A new species of sea cucumber of the genus Lissothuria Verrill, 1867 is described. Lissothuria caboblanquensis n. sp. was found in the Costa Rican Pacific, at 17 m depth. The presence of towers with spiny apex and the ...