Investigación
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Recent Submissions
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Changes in hormone concentrations during dormancy release of oil palm (Elaeis guineensis) seeds
(2008-10)Oil palm (Elaeis guineensis) seeds are highly dormant immediately after harvest. In practical horticulture this dormancy has been traditionally overcome by a dry-heat treatment and, more recently, through the application ... -
Floración in vitro - revisión de literatura
(2009-01)La floración in vitro puede ser inducida en diferentes estadios durante el desarrollo de las plantas in vitro mediante variaciones en los factores físicos y químicos relacionados con el cultivo de tejidos. Dentro de los ... -
Mode of action of plant hormones and plant growth regulators during induction of somatic embryogenesis: molecular aspects
(2005-11)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
(2005-11)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 ... -
Involvement of Plant Hormones and Plant Growth Regulators on in vitro Somatic Embryogenesis
(2005-11)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, ... -
Evolution of endogenous hormone concentration in embryogenic cultures of carrot during early expression of somatic embryogenesis
(2004-09)Embryogenic callus and suspension cultures of carrot (Daucus carota L., cv. Nantaise), growing on/in medium including 1 mg/l 2,4-dichlorophenoxy acetic acid (2,4-D), were transferred to medium with or without this plant ... -
Regulation of in vitro somatic embryogenesis with emphasis on to the role of endogenous hormones
(2001)Different aspects of the in vitro somatic embryogenesis regulation are reviewed in this paper.work. A description of g General aspects, such as terminology, uses, stages of development and factors associated with the somatic ... -
Endogenous hormone concentrations and embryogenic callus development in wheat
(2001-10)Immature zygotic embryos of two wheat (Triticum aestivum L.) genotypes, known for their different ability to generate embryogenic callus, were used as initial explants to establish callus cultures. Embryogenic and ... -
In vitro culture and endogenous hormone levels in immature zygotic embryos, endosperm and callus cultures of normal and high-lysine barley genotypes
(2001)Endogenous hormone levels viz. indole-3-acetic acid (IAA), abscisic acid, gibberellins 1, 3 and 20 (GAs), zcatin/zeatin riboside and N6(Δ2-isopentenyl) adenine/ N6(Δ2-i sopentenyl) adenosine were determined in immature ... -
Endogenous hormone levels in habituated nucellar Citrus callus during the initial stages of regeneration
(2001-01)Embryogenic nucellar callus cultures of different Citrus species and cultivars growing in hormone-free medium were transferred to medium containing either sucrose or glycerol as the only carbohydrate source. Glycerol has ... -
Streptococcus pneumoniae Upper Respiratory Carriage in Costa Rican Children with Otitis Media before the Introduction of the Heptavalent Conjugated Vaccine in the National Immunization Program
(2013)Objective: The aim of this study was to analyze the NP/OP S. pneumoniae serotype distribution and potential vaccine coverage in Costa Rican children with Otitis Media (OM) before the introduction of PCV-7 in the National ... -
Informe Estado de la Nación en Desarrollo Humano Sostenible 2018: Movilidad peatonal y en bicicleta en Costa Rica
(2018-10-20)El objetivo principal de esta ponencia es establecer, en términos generales, la situación actual de la movilidad no motorizada en el país. Se entiende movilidad no motorizada a la movilidad que se realiza a pie o en ... -
Caracterización anatómica ultraestructural de las variantes “Atlántica”, “Sur” y “Cebolla” del bambú, Guadua angustifolia(Poaceae: Bambusoideae), en Costa Rica
(2006-08-20)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: ... -
In vitro propagation of the neotropical giant bamboo, Guadua angustifolia Kunth, through axillary shoot proliferation
(2006)Guadua angustifolia Kunth was successfully propagated in vitro from axillary buds. Culture initiation, bud sprouting, shoot and plant multiplication, rooting and acclimatization, were evaluated. Best results were obtained ... -
Crecimiento de Mytella guyanensis (Bivalvia: Mytilidae) en balsas flotantes
(1998)Growth of the mytilid species Mytella guyanensis was studied on a floating raft in Chira Island, inner Gulf of Nicoya, Costa Rica. Natural seed collection was done with 1.5 m long spat collectors suspended from a wooden ... -
Social-cognitive Antecedents of Hand Washing: Action Control Bridges the Planning-Behavior Gap
(2016-04)Objectives. To examine motivational and volitional factors for hand washing in young adults, using the Health Action Process Approach (HAPA) as a theoretical framework. Design. In a longitudinal design with two measurement ... -
Action control bridges the planning-behavior gap: A longitudinal study on physical exercise in young adults
(2015)Objectives: Maintaining physical exercise levels may not only require motivation and planning but also action control which is supposed to mediate between planning and exercise. Design: Behavioural intention, action ... -
Promoting action control and coping planning to improve hand hygiene
(2015-09)Background We examined a brief educational intervention addressing hand hygiene self-regulatory mechanisms, and evaluated which psychological mechanisms may lead to hand hygiene behaviours. Methods Two hundred forty ... -
Estudios sobre la estabilidad del virus del rayado fino del maíz por degradación enzimática del ARN viral y microscopia electrónica de las partículas
(1986)The stability of "Maize Rayado Fino Virus" capsids was studied correlating enzymatic degradation analysis of the RNA in full capsids with electron microscopy of negatively stained particles. The great thermal stability of ... -
Identificación y selección de híbridos somáticos obtenidos mediantefusión de protoplastos
(2009)El poder seleccionar eficientemente las plantas híbridas producidas a partir de fusión de protoplastos es fundamental. Se han logrado muchos avances en el tema en las últimas décadas. Entre los métodos utilizados para la ...
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