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| Registros recuperados: 14 | |
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| NUNES CHINI,EDUARDO. |
| Nicotinic acid adenine dinucleotide phosphate (NAADP) is a potent activator of intracellular Ca2+ release in several vertebrate and invertebrate systems. The role of the NAADP system in physiologicalprocesses is being extensively investigated at the present time. The NAADP receptor and its associated Ca2+ pool have been hypothesized to be important in several physiologicalprocesses including fertilization, T cell activation, and pancreaticsecretion. However, whether NAADP is a new second messenger ora tool for the discovery of a new Ca2+ channel is still an unansweredquestion. Research developed over the last two years has provided some important clues to whether NAADP is or not a physiological cellular messenger. In this short review, I will discuss some... |
| Tipo: Journal article |
Palavras-chave: NAADP; Ca2+; Channels; CADPR; Intracellular; Second messenger. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400009 |
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| DELGADO,RICARDO; VERGARA,CECILIA; WOLFF,DANIEL. |
| Based on indirect evidence, a role for synaptically released copper and zinc as modulators of neuronal activity has been proposed. To test this proposal directly, we studied the effect of copper, zinc, and other divalent cations on voltage-dependent currents in dissociated toad olfactory neurons and on their firing rate induced by small depolarizing currents. Divalent cations in the nanomolar range sped up the activation kinetics and increased the amplitude of the inward sodium current. In the micromolar range, they caused a dose dependent inhibition of the inward Na+ and Ca2+ currents (I Na and I Ca) and reduced de amplitude of the Ca2+-dependent K+ outward current (I Ca-K). On the other hand, the firing rate of olfactory neurons increased when exposed to... |
| Tipo: Journal article |
Palavras-chave: Copper; Zinc; Modulators; Channels; Neuronal excitability. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100019 |
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| De La Hoz Aristizábal,Maria V.. |
| The bivalve Corbicula fluminea Müller is recorded for the first time in Colombia, in the National Park Isla de Salamanca. This protected area includes freshwater channels and mixohaline lagoons influenced by waters of both the Magdalena River and the Caribbean Sea. This exotic bivalve occurs locally in freshwater channels close to the Magdalena River as well as in the latter, whereas another corbiculid native species, Polymesoda solida, is commonly found in the mixohaline lagoons. Densities of C. fluminea ranged from 10 to 100 ind/m2 along with low numbers of P. solida. Lengths ranged form 10 to 43 mm in a predominant muddy substrate. Local fishermen have stated that C. fluminea was established approximately in 1992; this clam is being artisanally... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Corbicula; Invasive bivalve; Channels; Colombia; Caribbean. |
| Ano: 2008 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612008000100011 |
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| Frías de la Cruz, Juan Carlos. |
| Se realizo un ensayo con el objetivo de evaluar la calidad y rendimiento de la carne de ovinos en 2 sistemas de producción suplementados con caña de azúcar fermentada, 13 ovinos para el primer sistema (Cunduacán, Tabasco) de peso inicial promedio de 11.5 kg, pasto + sacchapulido y 24 ovinos para el segundo sistema (Huimanguillo Tabasco) de peso inicial promedio de 20 kg, pasto + sacchapulido + vitafer los cuales fueron evaluados mediante la estadística descriptiva. Todos los animales permanecieron pastoreando en las mismas praderas y diariamente se movilizaban a corraletas individuales en donde se le ofrecía el suplemento y se cuantifico el consumo del suplemento. Los sistemas no expresaron diferencia en la variable peso sacrificio, rendimiento frío y... |
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Palavras-chave: Pasto; Ovinos; Canales; Caña de azúcar fermentada; Pasture; Sheep; Channels; Fermented sugar cane. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/337 |
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| De la Hoz Aristizábal, M.V.. |
| The bivalve Corbicula fluminea Müller is recorded for the first time in Colombia, in the National Park Isla de Salamanca. This protected area includes freshwater channels and mixohaline lagoons influenced by waters of both the Magdalena River and the Caribbean Sea. This exotic bivalve occurs locally in freshwater channels close to the Magdalena River as well as in the latter, whereas another corbiculid native species, Polymesoda solida, is commonly found in the mixohaline lagoons. Densities of C. fluminea ranged from 10 to 100 ind/m2 along with low numbers of P. solida. Lengths ranged form 10 to 43 mm in a predominant muddy substrate. Local fishermen have stated that C. fluminea was established approximately in 1992; this clam is being artisanally... |
| Tipo: Journal Contribution |
Palavras-chave: Channels. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3494 |
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| Dubi, A.M.; Sanga, I.P.L.. |
| The study reported here sought to investigate the effect that the dredging of the harbour basins and the entrance channel has had on sediment deposition rate into the Dar es Salaam harbour. Echo-sounding was carried out along berths No 2, 3, 4, 6, 7 and 8 as a means of detecting changes to their bathymetry in the four years since 1998, when the dredging commenced. Concentrations of transported sediments into and out of the harbour were determined using sediment traps. Short-term measurement of waves and currents were also carried out. Sediment traps, a wave-gauge and a current-meter were deployed in the entrance channel during the South East and North East monsoon seasons respectively. Our results reveal that the sedimentation rates after improvement of... |
| Tipo: Journal Contribution |
Palavras-chave: Safety regulations; Sediment deposition; Channels; Dredging. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1108 |
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| Sankaré, Y.; Etien, N.. |
| Cet article présente les résultats d'une étude comparative de trois séries de prélèvements dans la zone proche du canal de Bassam avant, 6 mois et 20 mois après son ouverture en septembre 1987. Les effets constatés sont la diminution de l'abondance et la modification de la composition de la macrofaune benthique. Ces effets semblent de longue durée, sans reprise en ce qui concerne l'espèce la plus abondante, Corbula trigona. Les changements observés dans la structure des peuplements sont dus essentiellement à l'augmentation de la salinité, et à un degré moindre, aux modifications de la nature du sédiment. |
| Tipo: Journal Contribution |
Palavras-chave: Benthos; Channels; Estuaries. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/5521 |
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| Cotterill, Ronald W.; Putsis, William P., Jr.. |
| Formulating theoretical models inevitably requires various simplifications that assist in making analysis tractable and that facilitate deriving closed form solutions. While the strategic insights gained from theoretical models of market phenomena are often quite valuable, testing the theoretical assumptions made in these models can aid in assessing the broader applicability of the conclusions drawn. This is particularly true in the channels area, where the focus of research to date has largely been theoretical in nature. In an initial attempt to examine some of the assumptions made in previous theoretical research (e.g., Jeuland and Shugan 1983, McGuire and Staelin 1983, Choi 1991, Raju, Sethuraman and Dhar 1995), we focus on a limited set of issues.... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Pricing; Channels; Private labels; Competitive strategy; Demand and Price Analysis; Industrial Organization. |
| Ano: 1998 |
URL: http://purl.umn.edu/25211 |
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| Registros recuperados: 14 | |
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