Now showing items 10091-10100 of 10621
Primera cita de la filoxera de la vid, Daktulosphaira vitifoliae (Fitch)(Hemiptera: Phylloxeridae) en Costa Rica
Se cita por vez primera la filoxera de la vid, Daktulosphaira vitifoliae (Fitch), de Costa Rica, donde se ha encontrado sobre Vitis vinifera (cultivares “Santillán” y “criolla negra”).
The water striders (Hemiptera: Heteroptera: Gerridae) of Costa Rica: new species, checklist, and new records
Brachymetra bernaldi Cordeiro, sp. nov. (Hemiptera: Heteroptera: Gerridae) from Heredia, Costa Rica, is herein described, illustrated, and compared with congeners. The new species resembles B. albinervus (Amyot & Serville, ...
The larva of Perissolestes remotus (Williamson & Williamson, 1924) (Zygoptera: Perilestidae)
The larva of Perissolestes remotus is described for the first time based on Costa Rican specimens collected in forested streams with abundant organic matter. It is characterized by a slender, elongated body, with lateral ...
Two new species of Rhagovelia (Hemiptera: Heteroptera: Veliidae) from Costa Rica, with a key and new records from the country
Rhagovelia danpolhemi sp. nov., from the Caribbean Slope of Costa Rica and R. springerae sp. nov., from the northern portion of the country, are described, illustrated, compared with similar species, and included in a key ...
On the approximation of a virtual coarse space for domain decomposition methods in two dimensions
A new extension operator for a virtual coarse space is presented which can be used in domain decomposition methods for nodal elliptic problems in two dimensions. In particular, a two-level overlapping Schwarz algorithm is ...
Neotectónica del extremo oriental del Cinturón Deformado del Centro de Costa Rica
El Cinturón Deformado del Centro de Costa Rica corresponde con un ancho sistema de fallas neotectónicas que atraviesa transversalmente a Costa Rica, desde la fosa Mesoamericana, en el lado pacífico, hasta el Cinturón ...
Involvement of Plant Hormones and Plant Growth Regulators on in vitro Somatic Embryogenesis
In spite of the importance attained by somatic embryogenesis and of the many studies that have been conducted on this developmental process, there are still many aspects that are not fully understood. Among those features, ...
Mode of action of plant hormones and plant growth regulators during induction of somatic embryogenesis: molecular aspects
Plant hormones play critical roles in the establishment of somatic embryogenesis. During this process, somatic plant cells reverse their state of differentiation, acquire pluripotentiality and set up a new developmental ...
Participation of plant hormones in determination and progression of somatic embryogenesis
In vitro culture protocols have been developed for many species, mainly using empirical approaches, to induce somatic embryogenesis from various explant types. However, the underlying biochemical mechanisms governing ...
Caracterización anatómica ultraestructural de las variantes “Atlántica”, “Sur” y “Cebolla” del bambú, Guadua angustifolia (Poaceae: Bambusoideae), en Costa Rica
We present an ultrastructural characterization of three variants or “forms” of Guadua angustifolia and of the closely related Guadua sp., from Costa Rican populations. Their ultrastructure is similar. Differences are: ...