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Search Results: 1 - 10 of 474382 matches for " Marco A; Izaguirre-Fierro "
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The contents of Cd, Cu, Pb and Zn of the white shrimp Litopenaeus vannamei (Boone, 1931) of six coastal lagoons of Sinaloa, NW Mexico
Frías-Espericueta,Martín G; Osuna-López,Isidro; Voltolina,Domenico; Beltrán-Velarde,Marco A; Izaguirre-Fierro,Gildardo; López-López,Gabriel; Muy-Rangel,Maria D; Rubio-Carrasco,Werner;
Revista de biología marina y oceanografía , 2009, DOI: 10.4067/S0718-19572009000100020
Abstract: abstract litopenaeus vannamei is the most important shrimp species in the traditional fishery of the coastal lagoons of the state of sinaloa (nw mexico), and most of the landings are consumed locally. since these lagoons receive important volumes of agricultural, industrial and urban effluents, consumption of this shrimp could pose risks to human health. the mean content of cd, cu, pb and zn determined in the hepatopancreas of shrimp from commercial landings from six lagoons of sinaloa were higher than those of the muscle. there was a weak correlation between the zn content of the two tissues (p≤0.05) and the correlations were not significant for cd, cu and pb (p>0.1). the concentrations found in the shrimp muscle were comparable or lower than those determined in commercial landings of different crustaceans from other geographic areas. according to our results the consumption of local shrimp poses no risks to human health.
Budget and discharges of nutrients to the Gulf of California of a semi-intensive shrimp farm (NW Mexico) Balance y descarga de nutrientes al Golfo de California de una granja semi-intensiva de camarón del noroeste de México
Anselmo Miranda,Domenico Voltolina,Martín Gabriel Frías-Espericueta,Gildardo Izaguirre-Fierro
Hidrobiológica , 2009,
Abstract: A previous study conducted in 1998 assessed yearly nutrient discharge by the Sinaloa and Sonora shrimp farms to the coastal areas of the Gulf of California (1,509.4 and 438.7 tons of N and P corresponding to 2.1 and 1.05% of the total nutrient discharges to the Gulf along those two states coastlines). However, that estimate did not take into account other nutrient sources, nor the high daily water exchanges of the farms of Sonora, that are likely to increase the calculated amount of nutrients discharged. The evaluation of the nutrient budget of one semi-intensive shrimp farm of Sonora, including the nutrient sources not measured in other studies, showed that during one production cycle this farm discharged 547 kg N·ha-1 and 73 kg P·ha-1, with respective net exports of 122 kg N·ha-1 and 14 kg P·ha-1. Based on the results of this study, the recalculated totals for Sinaloa and Sonora, including rivers, agricultural runoff, and urban wastewater were 77,007.7 and 38,108.3 tons of N and P, and those of shrimp farms 3,556 tons of N and 620.7 tons of P (4.8 and 1.6%). The total discharges of 2003 may be estimated at 78,798.2 and 38,874.1 tons of N and P. In view of its high groth rate, the contributions of shrimp culture would be 10.1% and 3.3%. En un estudio llevado a cabo en 1998, se evaluó la cantidad de nutrientes descargada anualmente hacia las áreas costeras del Golfo de California por las granjas camaroneras de Sinaloa y Sonora en 1998 (1,509.4 ton de N y 438.7 ton de P, equivalentes a 2.1 y 1.05% del total de las descargas de ambos estados). Sin embargo, esta estimación no incluyó otras fuentes de ni los altos porcentajes de recambio diario de agua que se usan en Sonora pueden causar un incremento en la cantidad de nutrientes descargados. La evaluación del balance de N y de P de una granja de cultivo semi-intensivo de camarón ubicada en Sonora, para la cual se tomaron en cuenta algunas fuentes no consideradas en otros balances, demostraron que durante un ciclo de producción la granja descargó 547 kg de N·ha-1 y 73 kg P·ha-1, con descargas netas de 122 kg N·ha-1 y 14 kg P·ha-1. Con base en estos resultados las descargas totales de Sinaloa y Sonora, incluyendo ríos, agricultura y las aguas urbanas, fueron 77,007.7 y 38,108.3 ton de N y P, respectivamente; siendo las contribuciones de la camaronicultura de 3,556 tons de N y 620.7 tons de P (4.8 y 1.6%). El total de las descargas para 2003 se puede estimar en 78,798.2 y 38,874.1 ton de N y de P. En vista de su rápido crecimiento, las contribuciones de la camaronicultura se calcularon en 10.1% y 3.3%.
Budget and discharges of nutrients to the Gulf of California of a semi-intensive shrimp farm (NW Mexico)
Miranda, Anselmo;Voltolina, Domenico;Frías-Espericueta, Martín Gabriel;Izaguirre-Fierro, Gildardo;Rivas-Vega, Martha Elisa;
Hidrobiológica , 2009,
Abstract: a previous study conducted in 1998 assessed yearly nutrient discharge by the sinaloa and sonora shrimp farms to the coastal areas of the gulf of california (1,509.4 and 438.7 tons of n and p corresponding to 2.1 and 1.05% of the total nutrient discharges to the gulf along those two states coastlines). however, that estimate did not take into account other nutrient sources, nor the high daily water exchanges of the farms of sonora, that are likely to increase the calculated amount of nutrients discharged. the evaluation of the nutrient budget of one semi-intensive shrimp farm of sonora, including the nutrient sources not measured in other studies, showed that during one production cycle this farm discharged 547 kg n·ha-1 and 73 kg p·ha-1, with respective net exports of 122 kg n·ha-1 and 14 kg p·ha-1. based on the results of this study, the recalculated totals for sinaloa and sonora, including rivers, agricultural runoff, and urban wastewater were 77,007.7 and 38,108.3 tons of n and p, and those of shrimp farms 3,556 tons of n and 620.7 tons of p (4.8 and 1.6%). the total discharges of 2003 may be estimated at 78,798.2 and 38,874.1 tons of n and p. in view of its high groth rate, the contributions of shrimp culture would be 10.1% and 3.3%.
Cd, Pb AND ORGANOCHLORINE PESTICIDES OF MYTELLA STRIGATA (PELECYPODA: MYTILIDAE) OF SIX COASTAL LAGOONS OF NW MEXICO
Osuna-López,José I.; Frías-Espericueta,Martín G.; López-López,Gabriel; Zazueta-Padilla,Héctor M.; Izaguirre-Fierro,Gildardo; Páez-Osuna,Federico; Ruiz-Fernández,Ana C.; Voltolina,Domenico;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2009,
Abstract: los contenidos de cd y pb de los tejidos blandos de los mejillones de mangle mytella strigata colectados en 1996, en seis lagunas costeras del noroeste de méxico variaron entre 0.73 y 1.9 μg g-l y entre 8.3 y 17.1 μg g-l, respectivamente; los valores de ddd variaron entre 4.5 y 119 ng g-l los de dde desde menos del límite de detección (
El desarrollo conceptual de la ciencia cognitiva. Parte I
Fierro,Marco;
Revista Colombiana de Psiquiatría , 2011,
Abstract: introduction: cognitive science has become the most influential mental paradigm of the late twentieth and early twenty-first centuries. its concepts and approach to problems and solutions have changed significantly in the course of a few years. method: the fundamental concepts of cognitive science are presented and discussed, divided into four stages: the beginnings, classical cognitivism, connectionism, and embodiment-enaction. development and conclusion: the beginnings are marked by the construction of modern computers and the advent of information theory. classical cognitivism began in 1956 with the notion that all information processing systems, including the human brain, share the same principles. from the analogy between computer and brain, it was considered appropriate to study the mind as if it were software. connectionism, also called parallel distributed processing or neural networks get these names because of their underlying computational architecture. it helps explain the speed with which cognitive processes are performed and resistance to damage, being closer to biology. it does not work with representations, but with patterns of activation and deactivation of the component units and transmission of signals between them. typical cases of tasks performed by neural networks are found in perception and memory, for example, pattern recognition (faces, words from letters, etc).
El desarrollo conceptual de la ciencia cognitiva. Parte II
Fierro,Marco;
Revista Colombiana de Psiquiatría , 2012,
Abstract: introduction: cognitive science has become the most influential paradigm on mental health in the late 20th and the early 21st centuries. in few years, the concepts, problem approaches and solutions proper to this science have significantly changed. method: introduction and discussion of the fundamental concepts of cognitive science divided in four stages: start, classic cognitivism, connectionism, and embodying / enacting. the 2nd part of the paper discusses the above mentioned fourth stage and explores the clinical setting, especially in terms of cognitive psychotherapy. development and conclusions: the embodying/ enacting stage highlights the role of the body including a set of determined evolutionary movements which provide a way of thinking and exploring the world. the performance of cognitive tasks is considered as a process that uses environmental resources that enhances mental skills and deploys them beyond the domestic sphere of the brain. on the other hand, body and mind are embedded in the world, thus giving rise to cognition when interacting, a process known as enacting. there is a close connection between perception and action, hence the interest in real-time interactions with the world rather than abstract reasoning. regarding clinics, specifically the cognitive therapy, there is little conceptual discussion maybe due to good results from practice that may led us to consider that theoretical foundations are firm and not problem-raising.
El desarrollo conceptual de la ciencia cognitiva. Parte I The Conceptual Development of Cognitive Science. Part I
Marco Fierro
Revista Colombiana de Psiquiatría , 2011,
Abstract: Introducción: La ciencia cognitiva se ha constituido en el paradigma mental más influyente de finales del siglo XX y comienzos del XXI. Sus conceptos, el planteamiento de los problemas y las soluciones a estos han sufrido modificaciones significativas en el curso de pocos a os. Método: Presentación y discusión de los fundamentos de la ciencia cognitiva en cuatro etapas: los inicios, el cognitivismo clásico, el conexionismo y la corporalización-en acción. Desarrollo y conclusión: Los inicios están marcados por la construcción de las computadoras modernas y la aparición de la teoría de la información. El cognitivismo clásico comenzó en 1956 con la noción de que todos los sistemas procesadores de información, incluido el cerebro humano, comparten los mismos principios. A partir de la analogía entre la computadora y el cerebro, se consideró apropiado estudiar la mente como si se tratara de un software. El conexionismo, también llamado procesamiento distribuido en paralelo o de redes neuronales, permite explicar la rapidez con que se realizan los procesos cognitivos y su resistencia a los da os. No trabaja con símbolos, sino con patrones de activación y desactivación de las unidades componentes y de transmisión de se ales entre ellas. En percepción y memoria se encuentran los casos típicos de tareas realizadas por redes neuronales, por ejemplo, reconocimiento de patrones (rostros, palabras a partir de letras, etc.). Introduction: Cognitive science has become the most influential mental paradigm of the late twentieth and early twenty-first centuries. Its concepts and approach to problems and solutions have changed significantly in the course of a few years. Method: The fundamental concepts of cognitive science are presented and discussed, divided into four stages: The beginnings, classical cognitivism, connectionism, and embodiment-enaction. Development and Conclusion: The beginnings are marked by the construction of modern computers and the advent of information theory. Classical cognitivism began in 1956 with the notion that all information processing systems, including the human brain, share the same principles. From the analogy between computer and brain, it was considered appropriate to study the mind as if it were software. Connectionism, also called parallel distributed processing or neural networks get these names because of their underlying computational architecture. It helps explain the speed with which cognitive processes are performed and resistance to damage, being closer to biology. It does not work with representations, but with patterns of ac
El desarrollo conceptual de la ciencia cognitiva. Parte II Conceptual Development in Cognitive Science. Part II
Marco Fierro
Revista Colombiana de Psiquiatría , 2012,
Abstract: Introducción: La ciencia cognitiva se ha constituido en el paradigma acerca de lo mental más influyente de finales del siglo XX y comienzos del XXI. Sus conceptos, el planteamiento de los problemas y las soluciones a estos han sufrido modificaciones significativas en pocos a os. Método: Se presentan y se discuten los conceptos fundamentales de la ciencia cognitiva, dividiéndola en cuatro etapas de desarrollo: los inicios, el cognitivismo clásico, el conexionismo y la corporalización-enacción. También se explora el ámbito clínico, sobre todo lo atinente a la psicoterapia cognitiva. Desarrollo y Conclusiones: En la etapa de corporalización-enacción se destaca el papel del cuerpo, que con su conjunto evolutivamente determinado de movimientos da lugar a una manera de navegar el mundo y a un estilo de pensar. La realización de las tareas cognitivas es vista como un proceso que utiliza recursos del entorno capaces de amplificar las habilidades mentales y desplegarlas más allá del ámbito interno del cerebro. Por otra parte, se encuentra al cuerpo y la mente embebidos en el mundo, creando la cognición al interactuar con él, proceso denominado enacción. Desde esta perspectiva, se considera que hay una íntima conexión entre la percepción y la acción, de ahí el interés en las interacciones con el mundo en tiempo real más que en el razonamiento abstracto. En cuanto al ámbito clínico, específicamente la terapia cognitiva, hay poca discusión conceptual, debido quizá a que los buenos resultados en la práctica llevan a pensar que los fundamentos teóricos son firmes y poco problemáticos. Introduction: Cognitive science has become the most influential paradigm on mental health in the late 20th and the early 21st centuries. In few years, the concepts, problem approaches and solutions proper to this science have significantly changed. Method: Introduction and discussion of the fundamental concepts of cognitive science divided in four stages: Start, Classic Cognitivism, Connectionism, and Embodying / Enacting. The 2nd Part of the paper discusses the above mentioned fourth stage and explores the clinical setting, especially in terms of cognitive psychotherapy. Development and Conclusions: The embodying/ enacting stage highlights the role of the body including a set of determined evolutionary movements which provide a way of thinking and exploring the world. The performance of cognitive tasks is considered as a process that uses environmental resources that enhances mental skills and deploys them beyond the domestic sphere of the brain. On the other hand, body and mind are em
Psicosis y sistemas de creencias
Fierro Urresta,Marco; Rueda,Luisa; Abrahim,Jezmin; García,Estefanía; Jaimes,Luz Amparo; Atuesta,Juana;
Revista Colombiana de Psiquiatría , 2003,
Abstract: se presenta el caso de un paciente que tuvo síntomas claramente psicóticos favorecidos por la fuerza e intensidad que adquirió en su entorno familiar un sistema de creencias mágico. se utiliza la narración en primera persona por parte del paciente y de su madre con el fin de dar mayor énfasis al relato de las vivencias extra?as que precedieron la eclosión de la sintomatología. además, se revisa desde la antropología algunos conceptos centrales acerca del pensamiento mágico.
Psicosis y sistemas de creencias
Marco Fierro Urresta,Luisa Rueda,Jezmin Abrahim,Estefanía García
Revista Colombiana de Psiquiatría , 2003,
Abstract: Se presenta el caso de un paciente que tuvo síntomas claramente psicóticos favorecidos por la fuerza e intensidad que adquirió en su entorno familiar un sistema de creencias mágico. Se utiliza la narración en primera persona por parte del paciente y de su madre con el fin de dar mayor énfasis al relato de las vivencias extra as que precedieron la eclosión de la sintomatología. Además, se revisa desde la antropología algunos conceptos centrales acerca del pensamiento mágico.
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