Browsing Ciencias básicas by Title
Now showing items 915-934 of 1562
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Karyotype of the yellow-bellied sea snake, Pelamis platurus
(1980)In this paper we describe the karyotype of the yellow-bellied sea snake, Pelamis platurus from Costa Rica. The diploid number is 38 chromosomes, with 20 macrochromosomes and 18 microchromosomes. The pairs 1 and 2 are ... -
Key to the species of the genus Scleria (Cyperaceae) in Costa Rica based on the morphology of achenes
(2016)We described the achenes of 21 species of the genus Scleria reported in Costa Rica using 16 morphological characters and developed a key based only on achene characteristics. Specimens deposited in herbaria in Costa Rica ... -
Kinship, association, and social complexity in bats
(2019-01)Among mammals, bats exhibit extreme variation in sociality, with some species living largely solitary lives while others form colonies of more than a million individuals. Some tropical species form groups during the day ... -
Laboratorio de matemática: Fascículo #1
(Universidad de Costa Rica. Sede de Occidente, 1992, 1992)Este fascículo consiste en una serie de guías para utilizar los modelos didácticos correspondientes a diversos conceptos matemáticos incluidos en los programas de los cursos de la enseñanza primaria y secundaria. Incluye ... -
Lack of early inbreeding depression and distribution of selfing rates in the neotropical emergent tree Ceiba pentandra: Assessment from several reproductive events
(2015)Premise of the study: Selfing and mixed mating systems are prevalent in many flowering plants. Purging of genetic load can occur in these species, reducing negative effects of selfing. Long‐term studies of the temporal and ... -
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 ... -
Landau theory and giant room-temperature barocaloric effect
(2017-10-17)The structural phase transitions of MF3 (M = Al, Cr, V, Fe, Ti, Sc) metal trifluorides are studied within a simple Landau theory consisting of tilts of rigid MF6 octahedra associated with soft antiferrodistortive optic ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 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 ...