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Patrones de coloración en Hymenoptera: su origen, evolución y posible función en miras a la aplicación biomimética
(2020-04-28)El presente estudio proporciona la primera caracterización física y funcional del patrón negro-naranja-negro (BOB) que se encuentra en avispas parasitoides de muy pequeño tamaño (3-10 mm). Aunque se había reportado previamente ... -
Patrones de vocalización durante interacciones sociales de Rhynchonycteris naso (Chiroptera:Emballonuridae) en Costa Rica
(2020-11-17)Las señales vocales en el estudio de la comunicación animal tienen un potencial para transferir información que puede ser evaluado a través de sus características físicas (Kazial y Masters 2004), las cuales convergen en ... -
Patterns of reef fish taxonomic and functional diversity in the Eastern Tropical Pacific
(2023)A core challenge in ecology is identifying the factors that determine species distribution and functional diversity of species assemblages. Reef fish are the most diverse group of vertebrates, form taxonomically rich and ... -
Patterns of second‐to‐fourth digit length ratios (2D:4D) in two species of frogs and two species of lizards at La Selva, Costa Rica
(2012)It is now well documented that androgen and estrogen signaling dur- ing early development cause a sexual dimorphism in second-to-fourth digit length ratio (2D:4D). It is also well documented that males of mam- malian ... -
El pensamiento evolucionista de Clodomiro Picado T.
(Historia de la ciencia y la tecnología: el avance de una disciplina. Cartago: Editorial Tecnológica, 1989)Los autores que han escrito sobre la filosofía biológica de C. Picado han afirmado que era lamarckista, “como correspondía a un científico entren ado en París” en esa época Este trabajo intenta demostrar que esa afirmación ... -
Pentamera fonsecae n. sp. a new species of sea cucumber from the Pacific coast of Costa Rica (Holothuroidea: Dendrochirotida: Thyonidae)
(2020)Pentamera fonsecae n. sp. is described from seven specimens as a new species of Thyonidae from the Pacific coast of Costa Rica. It is distinguished from its congeners by having tables with ladder-shaped spires in the body ... -
Percepción comunitaria sobre arrecifes coralinos en Golfo Dulce: bases para integración social en programas de restauración
(2023)Introduction: Addressing the accelerated coral reefs degradation requires integrated action at multiple social and ecological scales. At local level, active participation of the main users must be included. Objective: ... -
Perspectivas y aplicaciones reales del grafeno después de 16 años de su descubrimiento
(2021)A 16 años del gran descubrimiento del grafeno los focos de atención vuelven a estar en este material con el reporte de su comportamiento superconductor dependiendo del apilado de sus capas. Sin embargo, su nombre durante ... -
Pesticide dissipation capacity of an organic biomixture used in the agriculture exposed to copper oxychloride
(2020)Highlights: • Copper oxychloride addition in a biopurification system was evaluated. • Simultaneous presence copper and pesticides affected slightly its dissipation capacity. • Microbial communities and biological ... -
Phalaenopsis schilleriana
(2004)El género Phalaenopsis, que consta de unas 60 especies, es uno de los más populares en la hibridación y la venta comercial, principalmente debido a la belleza, tamaño y duración de sus flores. Además, el crecimiento lento ... -
Pharmacological activities of a toxic phospholipase A isolated from the venom of the snake Bothrops asper
(1986)A toxic phospholipase A was isolated from the venom of Bothrops asper. It induced skeletal muscle damage, anticoagulant effects and edema in the foot pad. The toxin had an intravenous LD50 of 95 micrograms/16-18 g mouse ... -
Phenology of an urban population of Lyssomanes jemineus Peckham & Wheeler (Araneae: Salticidae) with a list of other jumping spiders from the same Costa Rican site
(2019)Jumping spiders were sampled for 24 months in a Costa Rican urban environment and one of the species collected, Lyssomanes jemineus, was observed in detail in order to document its phenology in this disturbed habitat. ... -
Phenology of myxomycetes in Turrialba, Costa Rica
(2021-05)Long-term monitoring and phenological patterns of microbial communities are rare in the scientific literature. Myxomycetes have life cycle characteristics that allow both to be documented. The present study summarizes ... -
Phenotypic variation and vocal divergence reveals a species complex in White-eared Ground-sparrows (Cabanis) (Aves: Passerellidae)
(2017-07-11)The taxonomy of the genus Melozone has recently been analyzed from genus to subspecies level, leading to a significant revision of our understanding of this group of birds. Previous studies quantified differences in ... -
Phospholipase C and sphingomyelinase activities of the Clostridium perfringens Alfa-toxin
(Chemistry and Physics of Lipids, 2009-02)Alfa-Toxin is a major pathogenic determinant of Clostridium perfringens, the causative agent of gas gangrene. Alfa-Toxin has been known for long to be a phospholipase C, but up to now its hydrolytic properties have been ... -
Photobiochemical changes in Chlorella g120 culture during trophic conversion (metabolic pathway shift) from heterotrophic to phototrophic growth regime
(2020)Physiological and photobiochemical changes and growth in the heterotrophic strain Chlorella vulgaris g120 were studied during trophic conversion from heterotrophic to phototrophic growth regime. After the exposure of the ... -
Photochemical efficiency of adult and young leaves in the neotropical understory shrub Psychotria limonensis (Rubiaceae) in response to changes in the light environment
(Revista de Biologia Tropical 52 (4): 839-844, 2004-12)We explored the short-term adjustment in photochemical efficiency (Fv/Fm) in adult and young leaves of the understory neotropical shrub Psychotria limonensis Krause (Rubiaceae) in response to rapid changes in the light ... -
Photosynthetic characterization of two Nannochloropsis species and its relevance to outdoor cultivation
(2020)Despite the increased interest in exploring the potential of algal biomass production for food stock and renewable energy, very little work has been done in developing reliable screening protocols to enable the identification ...