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Search Results: 1 - 10 of 25399 matches for " Dana Arizmendi-Rodríguez "
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Feeding of blue marlin Makaira nigricans off Mazatlan, Sinaloa, Mexico
Abitia-Cárdenas,Leonardo; Arizmendi-Rodríguez,Dana; Gudi?o-González,Napoleón; Galván-Maga?a,Felipe;
Latin american journal of aquatic research , 2010,
Abstract: we analyzed the stomach contents of 52 blue marlins caught between october 2002 and october 2004 by the sport-fishing fleet of mazatlan, sinaloa, in the gulf of california, mexico. blue marlin feed on 15 food items. according to the index of relative importance (iri), the most important prey were the frigate or bullet mackerel auxis spp. (52%) and jumbo squid dosidicus gigas (30%).
Feeding of blue marlin Makaira nigricans off Mazatlan, Sinaloa, Mexico Alimentación del marlin azul Makaira nigricans del área de Mazatlán, Sinaloa, México
Leonardo Abitia-Cárdenas,Dana Arizmendi-Rodríguez,Napoleón Gudi?o-González,Felipe Galván-Maga?a
Latin american journal of aquatic research , 2010,
Abstract: We analyzed the stomach contents of 52 blue marlins caught between October 2002 and October 2004 by the sport-fishing fleet of Mazatlan, Sinaloa, in the gulf of California, Mexico. Blue marlin feed on 15 food items. According to the index of relative importance (IRI), the most important prey were the frigate or bullet mackerel Auxis spp. (52%) and jumbo squid Dosidicus gigas (30%). Se analiza el contenido estomacal de 52 marlines azules capturados por la flota de pesca deportiva que operó en el área de Mazatlan, Sinaloa, en el golfo de California, México, durante el periodo octubre 2002 a octubre 2004. El marlin azul se alimenta de 15 categorías alimenticias (ítemes), de las cuales las más importantes de acuerdo al índice de importancia relativa (IRI), fueron el pez melva Auxis spp. (52%) y el calamar gigante Dosidicus gigas (30%).
Abundancia y distribución del calamar dedal, Lolliguncula panamensis (Teuthida: Loliginidae), en el golfo de California
Arizmendi-Rodríguez, DI;Salinas-Zavala, CA;Qui?ónez-Velázquez, C;Mejía-Rebollo, A;
Ciencias marinas , 2012,
Abstract: this study examines the abundance and distribution of panama brief squid (lolliguncula panamensis) caught during 15 fishery surveys in the gulf of california in 2003-2006 and 2008. a total of 2460 individuals were captured in 66 positive squid trawls. based on the seasonal sea surface temperature pattern, captured individuals were grouped into two periods: cold (<22 °c: december, january, february, march, and april 2003-2006 and 2008) and warm (≥ 22 °c: may, june, july, august, september, october, and november 2003-2006 and 2008). during the cold period, 1579 organisms were sampled, and during the warm period, 881. abundance by sex showed that females were more abundant during both periods (62% cold, 57% warm) than males (17% cold, 12% warm). during both periods, females (99.6% cold, 91.0% warm) as well as males (99.3% cold, 95.3% warm) presented reproductive activity (maturing and mature stages), and they were captured at depths between 7 and 40 m. the highest abundances occurred in diurnal trawls at an average depth of 40 m during the cold period and 24 m during the warm period.
Temperature induced conformational transitions of elastin-like polypentapeptides studied by Raman and NMR spectroscopy
Ji í Dybal,Pavel Schmidt,Dana Kurková,Jaroslav K í ,José Carlos Rodríguez-Cabello,Matilde Alonso
Spectroscopy: An International Journal , 2002, DOI: 10.1155/2002/819617
Abstract: Raman and NMR spectroscopy together with DFT quantum chemical calculations have been used to elucidate conformational changes occurring during inverse temperature transition in water solution of two elastin?like polypentapeptides, poly(G1V1G2V2P) and poly(AV1GV2P). From the temperature dependences of Raman spectra and 1H–1H NOESY spectra follows that above the transition temperature a β(II)?turn conformational structure is formed on the residue located between Pro and Val1.
Selección de áreas prioritarias para la conservación de flora gipsícola en el sureste de la Península Ibérica Selection of priority areas for the conservation of gypsophilous flora in southeast Iberian Peninsula
MANUEL I. CERRILLO,ELíAS D. DANA,HERMELINDO CASTRO,MARíA LUISA RODRíGUEZ-TAMAYO
Revista chilena de historia natural , 2002,
Abstract: Estudios recientes han demostrado que los afloramientos de yeso de la provincia de Almería (sureste de Espa a) son los de mayor valor desde el punto de vista de la conservación de la flora gipsícola ibérica. La necesidad de conservar este patrimonio unida a la imposibilidad real de proteger todos los afloramientos existentes en la región, nos llevó a elucidar qué áreas de la provincia deberían ser consideradas como prioritarias para lograr la conservación de la flora gipsícola de estos enclaves. Para ello, se estableció como objetivo prioritario lograr la representación de todas las especies al menos una vez, a la vez que se plantearon otros escenarios posibles en los que se podría basar la elección de áreas -objetivos complementarios-. Se elaboró la cartografía de los gipsófitos, referida a celdas de 10 km de lado y se evaluó la importancia de cada enclave según diferentes criterios utilizados comúnmente en los estudios sobre selección de áreas (diversidad de especies, rareza de la flora, complementariedad) contrastando los resultados obtenidos mediante cada uno de ellos. Los resultados mostraron que la protección de los afloramientos existentes en tan sólo tres cuadrículas (Sorbas, ya protegida principalmente por sus valores geomorfológicos, Venta de los Yesos y Topares) sería suficiente para lograr la representación de todos los gipsófitos de la región y alcanzar además varios de los objetivos complementarios de conservación. Los resultados se discuten teniendo en cuenta las peculiaridades sociales y administrativas del territorio Recent studies have highlighted the gypsum outcrops of Almería (southeast Spain) as the most outstanding for the conservation of Iberian gypsophilous flora. The need of preserving this natural heritage and the impossibility to protect all the outcrops present within the territory, led us to identify which areas should be considered as of priority for conservation. To this end, we establish as a priority that the proposed conservation network of sites should include all gypsophyte species at least once. Other possible conservation goals on which to base the area selection and the associated scenarios were also taken into account. We first elaborated a cartography for the gypsophytes based on 10 km sided-cells. Next, in order to rank the importance of each locality, several commonly employed conservation criteria (diversity, rarity of the flora, complementarity) were applied to the cartographic information, and the findings obtained by each procedure contrasted. The results showed that protecting the deposits found in three c
Selección de áreas prioritarias para la conservación de flora gipsícola en el sureste de la Península Ibérica
CERRILLO,MANUEL I.; DANA,ELíAS D.; CASTRO,HERMELINDO; RODRíGUEZ-TAMAYO,MARíA LUISA; MOTA,JUAN F.;
Revista chilena de historia natural , 2002, DOI: 10.4067/S0716-078X2002000200010
Abstract: recent studies have highlighted the gypsum outcrops of almería (southeast spain) as the most outstanding for the conservation of iberian gypsophilous flora. the need of preserving this natural heritage and the impossibility to protect all the outcrops present within the territory, led us to identify which areas should be considered as of priority for conservation. to this end, we establish as a priority that the proposed conservation network of sites should include all gypsophyte species at least once. other possible conservation goals on which to base the area selection and the associated scenarios were also taken into account. we first elaborated a cartography for the gypsophytes based on 10 km sided-cells. next, in order to rank the importance of each locality, several commonly employed conservation criteria (diversity, rarity of the flora, complementarity) were applied to the cartographic information, and the findings obtained by each procedure contrasted. the results showed that protecting the deposits found in three cells (sorbas, already protected because of its geomorphological singularity, venta de los yesos and topares) would allow the representation of each species at least once and to achieve several complementary conservation targets. the findings are discussed within the context of the social and administrative peculiarities of the area
An Extended Model of Currency Options Applicable as Policy Tool for Central Banks with Inflation Targeting and Dollarized Economies  [PDF]
Luis-Felipe Arizmendi
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.33027
Abstract:

The purpose of this paper is to provide a new set of tools for policy makers at central banks. Based on the Garman-Kohlhagen [1] formula for currency options, this research extends it with the Taylor-rule expression used for inflation targeting, thus obtaining the corresponding Call and Put options and the first and higher-degree partial derivatives known as “Greeks” for key variables such as the policy target domestic interest rate and the output gap.

Methodology and Equations of Mineral Production Forecast
—Part I. Crude Oil in the UK and Gold in Nevada, USA. Prediction of Late Stages of Production
 [PDF]

Sergio Pérez Rodríguez
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.35040
Abstract:

The equations of mineral production forecast link the change in time of mineral reserves with the production and the ratio of reserves to production. These equations allow us to model the development of the mineral resources evaluated at any scale. Probabilistic bidimensional charts made from montecarlo simulations provide intervals of confidence for the forecasts. The set of equations is devised and presented for a variety of applications to the oil and gas industry, as well to the production of any other mineral resource, either metals or non metals, whose ore deposit volumes and production might be quantified. The cases studied in the UK and USA are at late stages of production, periods for what the equations are most suitable to be applied without further adjustments. Experimental design allows the diagnosis of the likely values of the variables pertaining to the equations, in order to achieve the results provided by conventional production forecasts or to explore other scenarios of investigation. The method can be practical to evaluate commitments of production of mineral resources with time, to support strategic plans for companies, corporations, countries or regions based on those evaluations, for the screening and ranking of mineral assets based on their production potential and many other tasks where the prediction of future volumes of mineral production is required.

Methodology and Equations of Mineral Production Forecast. Part II. The Fundamental Equation. Crude Oil Production in USA  [PDF]
Sergio Pérez Rodríguez
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.36044
Abstract:

The fundamental equation of mineral production allows to model and design the dynamics of mineral production, however complex they are or could be. It considers not only the case of a constant production to reserves ratio for given intervals of time, but with a piecewise approach, it is also enabled to account the variation on time of this ratio. With a constant production to reserves ratio, the limit expression of the fundamental equation takes the form of an Erlang distribution with a fixed shape parameter. The rate parameter equals the scale factor. The discrete piecewise version, instead of considering the reserves and the production to reserves ratio being constant through certain intervals of time, updates both variables by units of time. This version, using either lineal or non lineal functions for the variables involved, let to model known production profiles or to forecast them by experimental design. The Hubbert’s linearization updated with recent data and the p-box method applied to determine ultimate recovery of U.S. crude oil reserves indicate official accounts underestimate them. The analysis of the ideal model of production based on Hubbert’s linearization and curve, can be made by decomposing it in the distribution with time of the reserves and of the production to reserves ratio. The distribution of reserves with time is synchronized for both the ideal Hubbert’s curve and real profiles, disregarding whether they match or not. The departure of real profiles from the ideal Hubbert’s curve lies on the differences or correspondences of the distribution with time of the production to reserves ratio. The MonteCarlo simulation applied to forecast US crude oil production for the next five years points to a slow decline, with average annual yields presenting a difference lower than 10% between the start and the end of the simulation.

The Hypothesis of Hyperia from the Perspective of Neuronal Plasticity  [PDF]
Javier álvarez-Rodríguez
Open Journal of Medical Psychology (OJMP) , 2016, DOI: 10.4236/ojmp.2016.51003
Abstract: We analyze certain mental automatisms appearing in the consciousness with phenomenological features of simple partial seizures (SPSs). We propose to include all these phenomena into a cognitive function to which we term hyperia. In this paper, we analyze the similarities between the nature of this cognitive function and the mechanisms used by our brain to elicit neuronal plasticity.
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