Browsing Biología by Title
Now showing items 1132-1151 of 1180
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Ultrastructural and microbial analyses of cellulose degradation in leaf-cutter ant colonies
(2017)Leaf-cutter ants (Atta and Acromyrmex) use fresh leaves to cultivate a mutualistic fungus (Leucoagaricus gongylophorus) for food in underground gardens. A new ant queen propagates the cultivar by taking a small fragment ... -
Ultrastructural demonstration of the model of Litopenaeus vannamei (Crustacea, Penaeidae) male sexual maturation and spermatozoal capacitation
(2016)The present study demonstrates ultrastructurally the model of Litopenaeus vannamei male sexual maturation and spermatozoal capacitation. The results show that phase 1 of the model occurred in the seminiferous tubules and ... -
Ultrastructure and histology of organogenesis induced from shoot tips of maize (Zea mays, Poaceae)
(Revista de Biología Tropical; vol.57(supl.1), 2009-11)Shoot tips of maize (Zea mays L.) were cultured on Murashige and Skoog medium supplemented with 2 mg/l BA +1 mg/l 2,4-D +40 mg/l, to investigate phases of ontogenetic development. The study used light microscopy as well ... -
Ultrastructure of Deinopis egg sac (Araneae: Deinopidae)
(2014)Attacks by predators and parasitoids on spider eggs are common. To counteract their negative effect, spiders have evolved a series of behaviours and features related to their egg sacs. In the genus Deinopis (Deinopidae) ... -
Unearthing 20th-century treasures: new records of deep-sea crustaceans from the Costa Rican Pacific
(2020-09)We report on 13 species collected during the 1973 expedition onboard the MY “Velero IV”: seven Euphausiidae (krill), two Benthesicymidae shrimp, two Sergestidae shrimp, one Acanthephyridae shrimp, and one Portunidae crab. ... -
Unraveling the whole story: An Ultraestructural study of the common bean "amachamiento" disease caused by Aphelencoides besseyi
(2019-07-21)Se identificó Aphelencoides besseyi como responsable del amachamiento del frijol -
Unveiling the Hidden Bat Diversity of a Neotropical Montane Forest
(2016-10)Mountain environments, characterized by high levels of endemism, are at risk of experiencing significant biodiversity loss due to current trends in global warming. While many acknowledge their importance and vulnerability, ... -
Updated checklist and analysis of completeness of the marine fish fauna of Isla del Coco, Pacific of Costa Rica
(2016)Isla del Coco, Costa Rica, is one of the five groups of oceanic islands of the Eastern Tropical Pacific (ETP), and is considered one of the most diverse. Since the mid-19th century, it has been the target of a number of ... -
Urban noise influences vocalization structure in the House Wren Troglodytes aedon
(2013)Urban habitats are noisy and constrain acoustic communication in birds. We analysed the effect of anthropogenic noise on the vocalization characteristics of House Wrens Troglodytes aedon at two sites with different noise ... -
Uso de material artificial para la construcción de nidos de aves: potenciales consecuencias sobre el éxito reproductivo de Turdus grayi (Passeriformes: Turdidae)
(2020-07-29)El exponencial aumento en la población humana ha generado una rápida expansión de las zonas urbanas. El aumento en el área de las ciudades produce que algunas especies entren en contacto directo con nuevos recursos ... -
Über die erfolgreiche Verbreitung von Oeceoclades maculata in Costa Rica
(2012)This article informs about the successful conquest of Costa Rica by the African terrestrial orchid Oeceoclades maculata, which has even invaded some national parks of this Central American country, for the most part in the ... -
Validation of a methodology by LC-MS/MS for the determination of triazine, triazole and organophosphate pesticide residues in biopurification systems
(2020)Biopurification systems are useful in the management of pesticide residues and provide an option to dispose wastewaters of agricultural origin derived from pesticide application practices. The analysis of pesticide residues ... -
Vanilla distribution modeling for conservation and sustainable cultivation in a joint land sparing/sharing concept
(2020-03)Vanilla, an expensive but popular spice used in many industries, faces problems related to its supply. Some of these problems are due to the fact that vanilla cultivation is based on clonal material of a single species ... -
Variabilidad genética de la avifauna de las tierras altas de Costa Rica: Consecuencias del calentamiento global.
(2011-07-09)Determinar la susceptibilidad de un grupo de aves pertenecientes a diferentes líneas evolutivas (e.g.trochilidae, tyrannidae, emberizidae) a los cambios ambientes que pueden ocurrir como consecuencia del incremento en la ... -
Variabilidad genética y relaciones de parentesco de las poblaciones de Lapa Roja (Ara macao).
(2011-06-29)Caracterizar la variabilidad genética de la población silvestre de Ara Macao en Costa Rica para establecer políticas de manejo y conservación de esta especie.