Listar Ciencias básicas por título
Mostrando ítems 1257-1276 de 3078
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Faà di Bruno Hopf algebras
(2022-11)This is a short review on the Faà di Bruno formulas, implementing composition of real-analytic functions, and a Hopf algebra associated to such formulas. This structure allows, among several other things, a short proof of ... -
El factor humano en la regeneración de bosques
(2004-06)Se proponen ideas prácticas para la recuperación de bosques, valorando tres estrategias: A) Regeneración natural, sin intervención antropógena más allá de la protección física (ej., cercas, vallas, rondas contra incendios) ... -
Factores de paisaje y de manejo ligados a la conservación de mamíferos terrestres dentro de la Reserva Forestal Golfo Dulce, Costa Rica
(2022)Las Áreas Protegidas (AP) son esenciales como hábitat para especies en peligro como los mamíferos grandes y medianos, sin embargo, cada vez es más evidente que la conservación en tierras privadas es necesaria para que las ... -
Factors affecting phenological patterns of bombacaceous trees in seasonal forests in Costa Rica and Mexico
(2003)We compared phenological patterns of tree species of the family Bombacaceae in three seasonal forests in Mexico and Costa Rica whose dry seasons vary in duration and intensity. The objectives were to (1) determine intraspecific ... -
Fallen Branches as Part of Leaf-Cutting Ant Trails: Their Role in Resource Discovery and Leaf Transport Rates in Atta cephalotes
(2007)Fallen branches, logs, and exposed roots (fallen branches hereafter) commonly form part of the trunk trail system of leaf-cutting ants that inhabit the tropical rain forest. We studied the role of fallen branches on resource ... -
Faltings heights of CM elliptic curves and special Gamma values
(2017-12)In this paper, we evaluate the Faltings height of an elliptic curve with complex multiplication by an order in an imaginary quadratic field in terms of Euler’s Gamma function at rational arguments. -
La familia Bombacaceae (Malvales) en Costa Rica
(1997)General descriptions and taxonomic keys to the nine genera (Bernoullia, Ceiba, Huberodendron, Matisia, Ochroma, Pachira, Pseudobombax, Quararibea, and Spirotheca) and twenty-four species of Bombacaceae species known to ... -
Familia LOASACEAE
(2021-11-05)Este texto describe las características de plantas pertenecientes a varias especies de la familia Loasaceae. Se detallan aspectos de sus tallos, raíces, hojas, flores, inflorescencias, y frutos. También se menciona la ... -
La fase Terrestre de la Tortuga lora 1081Lepidochelys olivacea
(1980)Esta investigación estudia algunos aspectos de la fase terrestre del ciclo de vida de la tortuga lora Lepidochelys olivacea -
Fate of buturon-14C in soil during seven seasons of exposure under outdoor conditions
(1984-03)Buturon (ring 14C) was applied to wheat and soil in two successive years (3 kg/ha each year) at outdoor conditions. Residual radioactive substances in the upper soil layer (0-10-cm depth) were measured 1.5, 2.5, 3.5, 6.0, ... -
Faulting, shallow seismicity and seismic hazard analysis for the Costa Rican Central Valley
(2000)A seismic hazard map for the Metropolitan Area of San Jose has been elaborated, based on local tectonic and seismic information. The area for the hazard computation covers an area of 20 x 15 km2 and includes the zone where ... -
Feeding by Philoponella vicina (Araneae, Uloboridae) and how uloborid spiders lost their venom glands
(2006)Feeding by uloborid spiders is unusual in several respects: cheliceral venom glands are absent; prey wrapping is extensive (up to several hundred metres of silk line) and severely compresses the prey; the spider’s mouthparts ... -
Feeding ecology of common demersal elasmobranch species in the Pacific coast of Costa Rica inferred from stable isotope and stomach content analyses
(2015)Knowledge of the feeding ecology and trophic interactions of marine species is essential to understanding food web dynamics and developing ecosystem-based management approaches. Given that many top predatory fishes have ... -
Feeding effectiveness of Megaphobema mesomelas (Araneae, Theraphosidae) on two prey types
(2012)Prey selection is essential for individual fitness; therefore, it would be expected that a predator would select prey of a higher rank (energy/time) when exposed to prey of differing quality. In this paper, we compare the ... -
Feeding habits of the Pacific bearded brotula Brotula clarkae Hubbs, 1944 (Ophidiidae) along the Pacific coast of Costa Rica, Central America
(2016)The present study analyzed the diet composition, ontogenetic shifts and dietary overlap of Brotula clarkae in relation to stage of maturity and sex. Samples were collected from the trawling fishery along the Pacific coast ... -
Fenología de Crescentia alata (Bignoniaceae) en Guanacaste, Costa Rica
(2019)Los estudios fenológicos generan información que contribuye con el conocimiento de las relaciones entre especies y componentes abióticos de los ecosistemas, disponibilidad de alimento para animales y regeneración de cobertura ...