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Search Results: 1 - 10 of 499366 matches for " Héctor M.; Izaguirre-Fierro "
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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 (
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%.
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.
Factors affecting luminescence and aurophilicity on digold(I) complexes and their potential as cation probes
M Cristina Lagunas,Claudio Mendicute Fierro,Aranzazu Pintado-Alba,Héctor de la Riva,Soledad Betanzos-Lara
Gold Bulletin , 2007, DOI: 10.1007/BF03215570
Abstract: In the last few years we have analysed the factors that affect the structures and luminescence properties of Au(I) compounds, specifically in relation with the presence of aurophilic contacts and their application as cation probes. EXAFS studies have allowed us to obtain for the first time direct structural data of dissolved Au(I) compounds. An overview of the work reported to date is presented here. The optical properties of complex [Au2Cl2(μ-dpephos)] (dpephos =bis(2-diphenylphosphino) phenylether, 1) have been revisited and new results are now included. New aspects on the use of the complexes as Ag(I) probes are also discussed.
INFORME ANUAL DE LABORES DEL INSTITUTO DE INVESTIGACIONES JURíDICAS DE LA UNAM (SEPTIEMBRE DE 2009 A AGOSTO DE 2010 Y RESUMEN DEL PERIODO 2006-2010)
Héctor FIX-FIERRO
Boletín mexicano de derecho comparado , 2012,
Abstract: ...
INFORME ANUAL DE LABORES DEL INSTITUTO DE INVESTIGACIONES JURíDICAS DE LA UNAM (SEPTIEMBRE DE 2010 A AGOSTO DE 2011)
Héctor FIX-FIERRO
Boletín mexicano de derecho comparado , 2012,
Abstract: ...
INFORME ANUAL DE LABORES DEL INSTITUTO DE INVESTIGACIONES JURíDICAS DE LA UNAM (SEPTIEMBRE DE 2008 A AGOSTO DE 2009)
Héctor FIX-FIERRO
Boletín mexicano de derecho comparado , 2010,
Abstract:
INFORME ANUAL DE LABORES DEL INSTITUTO DE INVESTIGACIONES JURíDICAS DE LA UNAM (SEPTIEMBRE DE 2007-AGOSTO DE 2008)
Héctor FIX-FIERRO
Boletín mexicano de derecho comparado , 2009,
Abstract:
Discurso del director Héctor Fix-Fierro con motivo del septuagésimo aniversario del Instituto de Investigaciones Jurídicas de la UNAM
HéCTOR FIX-FIERRO
Boletín mexicano de derecho comparado , 2010,
Abstract:
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