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Now showing items 41-60 of 2918
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Combined effects of dissolved oxygen concentration and water temperature on embryonic development and larval shell secretion in the marine snail Chorus giganteus (Gastropoda: Muricidae)
(2003)The present study was undertaken to determine the effects of both extracapsular oxygen concentration and temperature on embryonic development in Chorus giganteus. In normoxia increasing water temperature from 12Cto18 C ... -
Diversidad de macroinvertebrados asociados a arrecifes de Phragmatopoma moerchi kinberg, 1867 (Polychaeta: Sabellariidae) en el intermareal rocoso de Cocholgue,Chile
(2003)Las agregaciones monoespecíficas son comunes en el intermareal rocoso. Una de estas especies gregarias es el poliqueto tubícola Phragmatopoma moerchi, el cual construye arrecifes de tamaño variable en el intermareal rocoso. ... -
Crypsis in early benthic phases of Brachyuran Decapod Crustaceans in central Chile
(2003)Although common and in some cases of commercial value, little is known about the mechanisms and processes that affect the distribution and abundance of many species of decapod crustaceans, particularly in Chile. All of ... -
How parasites divide resources: a test of the niche apportionment hypothesis
(2003)Modelling species abundance patterns, i.e. the distribution of relative abundance among species within the same community, has become a common framework in community ecology. To describe species abundance patterns several ... -
Effects of lipid emulsions and temperature on the hatchery performance of Chilean scallop Argopecten purpuratus (Lamarck 1819) larvae
(2003)The main constraint for scaling up production of scallop Argopecten purpuratus is the lack of informa- tion on the nutritional requirements and feeding regimes in the early stages. Research is currently focused on the ... -
A FEM–DtN formulation for a non-linear exterior problem in incompressible elasticity
(2003)In this paper, we combine the usual infinite element method with a Dirichlet-to-Neumann (DtN) mapping, derived in terms of an infinite Fourier series, to study the solvability and Galerkin approximations of an exterior ... -
Aplicación de una pauta diseñada para evaluar informes académicos universitarios
(2003)La afiliación de un estudiante a una universidad se produce cuando demuestra que puede ser un lector autónomo y un escritor competente del discurso académico. Aunque uno de los escritos más requeridos en este contexto es ... -
Larval fish assemblages in nearshore coastal waters off central Chile: temporal and spatial patterns
(2003)In this study we identified spatial and temporal patterns in the distribution and abundance of larval stages of several fish species in nearshore waters off central Chile. Larvae were sampled monthly at two close (20 km ... -
The relationship between species richness and productivity in metazoan parasite communities
(2003)Biodiversity is not distributed homogeneously in space, and it often covaries with productivity. The shape of the relationship between diversity and productivity, however, varies from a monotonic linear increase to a ... -
Mini-symposium: Behavioral ecology of crustaceans
(2003)Crustaceans are common and conspicuous in a wide range of environments, particularly in the marine realm. Despite their high diversity and abundance, many aspects of their natural history and general biology remain little ... -
The peracarid epifauna associated with the ascidian Pyura chilensis (Molina, 1782) (Ascidiacea: Pyuridae)
(2003)Epifaunal peracarids inhabit a variety of biogenic substrata, including ascidians. Herein we examined the peracarid fauna living on the tunica of the sublittoral ascidian Pyura chilensis growing in off shore and nearshore ... -
Mean field theory studies of surface reactions on disordered substrates
(2003)A mean field theory (MFT) in the site and pair approximations of a surface reaction system on a disordered substrate showing geometric heterogeneity is proposed, characterizing the substrate completely through the set {qi} ... -
Querying Heterogeneous Spatial Databases: Combining an Ontology with Similarity Functions
(2004)This paper uses a knowledge-based approach to querying heterogeneous spatial databases based on an ontology and conceptual and attribute similarities. The ontology, which may be independent of the databases, expands and ... -
Especiación de zinc en sedimentos marinos del fiordo Aysén
(2004)Se analiza la especiación de zinc presente en los sedimentos superficiales del fiordo Aysén mediante un ataque diferencial para identificar la dominancia de las diferentes especies de Zn. Las muestras se obtuvieron en ... -
Efectos del retardo del asentamiento en las expectativas de vida del briozoo Bugula flabellata (Bryozoa: Gymnolaemata)
(2004)En presencia de un substrato adecuado las larvas lecitotróficas del briozoo Bugula flabellata se asientan preferentemente durante las primeras seis horas luego de su liberación desde las cámaras de incubación, mientras ... -
Dieta del pez espada Xiphias gladius Linnaeus, 1758, en aguas oceánicas de Chile central en invierno de 2003
(2004)Se analiza la dieta del pez espada en tres zonas de pesca en aguas oceánicas de Chile central durante el invierno de 2003, considerando como hipótesis que el tamaño de las presas se incrementa significativamente con el ... -
Effects of ionic strength on the production of short chain volatile hydrocarbons by Dunaliella salina (Teodoresco)
(2004)The effect of ionic strength on the production of short chain volatile hydrocarbons was studied in cultures of Dunaliella salina. Axenic cultures of D. salina were grown at three different ionic strengths 0.5, 2 and 3 M ... -
Oxidized Low-Density Lipoproteins Stimulate xtracellular Matrix Metalloproteinase Inducer (EMMPRIN) Release by Coronary Smooth Muscle Cells
(2004)Deposition of low-density lipoproteins (LDLs) in the vessel wall and their oxidative modification seem to initiate, or at least accelerate, the atherosclerotic process by several mechanisms, including promotion of foam ... -
La dieta y fauna de endoparásitos del pejesapo Gobiesox marmoratus Jenyns, 1842 (Pisces: Gobiesocidae) en el litoral central de Chile están conectadas pero no correlacionadas
(2004)Se documenta una alta similitud en la composición de la fauna parasitaria y de la dieta de 108 ejemplares del pejesapo Gobiesox marmoratus Jenyns, 1842 recolectados de la costa de la zona centro-sur de Chile, desde tres ... -
Optimization of cephalexin synthesis with immobilized penicillin acylase in ethylene glycol medium at low temperatures
(2004)Organic cosolvents, and among them, polyols, are suitable media to perform the enzymatic synthesis of -lactam antibiotics with immobilized penicillin acylase, because they effectively reduce water activity, depressing ...