717 resultados para Murat, Joaquin.


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Modalidad Joaquín Guichot : Primer premio 'Alberinto'; Mención especial 'La música popular como recurso didáctico en el aula'; Modalidad Antonio Domínguez Ortiz : Primer Premio 'El patio como recurso pedagógico'; Mención Especial 'Programa de enriquecimiento curricular: nosotros queremos saber más'; Mención Especial 'Los weblogs como herramienta educativa: taller cooperativo de escritura creativa'; Mención Especial: 'Interactuando con el azar'

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We investigated diurnal nitrate (NO3-) concentration variability in the San Joaquin River using an in situ optical NO3- sensor and discrete sampling during a 5-day summer period characterized by high algal productivity. Dual NO3- isotopes (delta N-15(NO3) and delta O-18(NO3)) and dissolved oxygen isotopes (delta O-18(DO)) were measured over 2 days to assess NO3- sources and biogeochemical controls over diurnal time-scales. Concerted temporal patterns of dissolved oxygen (DO) concentrations and delta O-18(DO) were consistent with photosynthesis, respiration and atmospheric O-2 exchange, providing evidence of diurnal biological processes independent of river discharge. Surface water NO3- concentrations varied by up to 22% over a single diurnal cycle and up to 31% over the 5-day study, but did not reveal concerted diurnal patterns at a frequency comparable to DO concentrations. The decoupling of delta N-15(NO3) and delta O-18(NO3) isotopes suggests that algal assimilation and denitrification are not major processes controlling diurnal NO3- variability in the San Joaquin River during the study. The lack of a clear explanation for NO3- variability likely reflects a combination of riverine biological processes and time-varying physical transport of NO3- from upstream agricultural drains to the mainstem San Joaquin River. The application of an in situ optical NO3- sensor along with discrete samples provides a view into the fine temporal structure of hydrochemical data and may allow for greater accuracy in pollution assessment.

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Hay un ejemplar encuadernado con: El Mejor Padre del Mundo (NP24-25/340).

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Verso de la port. grab. xil

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Hay un ejemplar encuadernado con: Rondalla de Rondalles a imitació del cuento de cuentos de Don Francisco de Quevedo y de la historia de histories de Don Diego de Torres (XVI/378).