Mauricio Elias Hasfura Molina - Academia.edu (original) (raw)
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Papers by Mauricio Elias Hasfura Molina
Boletin Latinoamericano Y Del Caribe De Plantas Medicinales Y Aromaticas, Nov 1, 2013
Blueberry is a popular natural food product consumed worldwide. Acid soils are found throughout t... more Blueberry is a popular natural food product consumed worldwide. Acid soils are found throughout the world. A significant problem of acid soils is the active aluminum content, which may result toxic to plant. The present study was undertaken to assess the toxicities of Al for Blueberry (Vaccinium corymbosum L.) cultivated in vitro and treated with 100 and 200 μM Al. The effects of Al concentration on malondialdehyde (MDA) content, antioxidant activity and phenolic compounds of blueberry after 7, 14 and 21 days of treatment were established. The analysis of the MDA accumulated in the tissues of the blueberry seedlings indicates that Al concentration increases the damage caused by lipid peroxidation, for both treatments, after 14 days. The highest antioxidant activity in the extracts was observed at 200 μM Al after 14 days of treatment, being chlorogenic and ellagic acids the most significant metabolites involved in the antioxidant properties. Then, the content of Al in soil could be modulate the content of bioactive compounds in blueberry plants.
Plant and Soil, 2013
The trace element uptake process of plants is a key factor in assessing the risks of trace elemen... more The trace element uptake process of plants is a key factor in assessing the risks of trace element build-up in agricultural soils. Scarce information exists on the trace element dynamic uptake of plants grown in the field, especially on those potentially hazardous. In this study, the uptake process of As, Cd, Cu, and Zn in maize plants was quantified and characterized throughout the entire season. Methods Along two seasons, the uptake dynamics of field-grown maize plants in absorbing the soil borne trace elements was examined. Biomass production and the concentration of the elements in plant and soil solution samples were determined. A kinetic model was employed to characterize the uptake by plants. The kinetic parameters of the uptake process, maximum cumulative uptake rate, U max , time to reach 50 % of U max , t U50 , and reciprocal of the uptake rate, b U when followed throughout the season in terms of the plant's growing degree days remained constant between seasons and were element specific. In spite of the large amount biomass produced, maize plants extracted minute quantities of Cd and As. Increasing cumulative uptake rates of As, Cd, Cu, and Zn from the soil took place primarily in the early half of the growing season when the biomass accumulation was still less than 50 % of the maximum harvested biomass. The element-specific plant uptake factor (PUF), which denote the partition of trace elements between the soil solution and plant phases, decreased following
Soil and Sediment Contamination: An International Journal, 2010
... Mesquita, ME and Vieira e Silva, JM 2002. Preliminary study of pH effect in the application o... more ... Mesquita, ME and Vieira e Silva, JM 2002. Preliminary study of pH effect in the application of Langmuir and Freundlich isotherms to Cu-Zn competitive adsorption. ... Environ. Eng. Sci. , 20: 607–616. [CrossRef], [Web of Science ®] View all references; Cazanga et al., 200813. ...
Soil and Sediment Contamination: An International Journal, 2009
Soil and Sediment Contamination, 18:497511, 2009 Copyright © Taylor & Francis Group, LLC... more Soil and Sediment Contamination, 18:497511, 2009 Copyright © Taylor & Francis Group, LLC ISSN: 1532-0383 print / 1549-7887 online DOI: 10.1080/15320380902962320 ... Used in Chile: Phosphorus Fertilizers as a Source ... MAURICIO MOLINA,1 FABI ´AN ABURTO,2 ...
Journal of Non-Crystalline Solids, 2011
The requested paper is not presently available in its full-text version for it has not been suppl... more The requested paper is not presently available in its full-text version for it has not been supplied yet by the researcher in charge of the archiving. * * * * El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.
Environmental Chemistry, 2010
Environmental context. Intensive fertilisation and the availability of phosphorus species (less t... more Environmental context. Intensive fertilisation and the availability of phosphorus species (less than 10%) in cultivable soils of volcanic origin are causing the accumulation of P in these soils. Phosphorus is a macronutrient that severely limits good agricultural development, so knowledge of the distribution and the different forms of P present in soils is fundamental for sustainable agricultural practice. This novel study reports the existence of increased available P in all the soils that received a load of plant ash from different tree species. . The effect associated with the distribution of ash from plantations of native, pine, and eucalyptus forests over five soils of volcanic origin was studied by means of column leaching experiments. The results show a clear increase of pH (up to 4.4 units) and of the soil’s electric conductivity (up to 21 times), whereas total extractable P content increased 3 to 10 times with respect to the control. These effects follow a sequence dependin...
Archives of Agronomy and Soil Science, 2012
Abstract The objective of this study was to evaluate the suitability of the ammonium bicarbonate ... more Abstract The objective of this study was to evaluate the suitability of the ammonium bicarbonate diethylenetriaminepentaacetic acid (AB-DTPA) multiextractant to estimate the available P, exchangeable cations (K, Ca, Mg, Na) and extractable micronutrients (Cu, Fe, ...
introduciéndonos en la construcción del Estado del Arte. El mismo se vincula al Análisis de Discu... more introduciéndonos en la construcción del Estado del Arte. El mismo se vincula al Análisis de Discursos Político-Mediáticos de la línea editorial de los diarios La Nación y Página/12, en torno a la disputa de proyectos político-estratégicos de país rumbo al Ballotage.
Este trabajo es una introduccion al proyecto de investigacion que culminara en nuestro Trabajo In... more Este trabajo es una introduccion al proyecto de investigacion que culminara en nuestro Trabajo Integrador Final, de recorte economico politico y sociocultural, que pretende reflexionar en torno a las relaciones de fuerzas oligopolicas en el sistema de medios de comunicacion masiva a partir de la asuncion de Mauricio Macri como Presidente de la Nacion Argentina. Para eso, cabe destacar las principales politicas comunicacionales de la gestion Cambiemos (incluye DNUs y medidas adoptadas por el Ministerio de Comunicaciones y ENaCom) desarrolladas desde el 10/12/2015 hasta el 01/01/2018 cuando se concreta la fusion Cablevision-Telecom. Al asumir, Mauricio Macri firmo el Decreto de Necesidad y Urgencia n°13/2015, a traves del cual modifico la Ley de Ministerios para reestructurar el esquema ministerial del Poder Ejecutivo. Esta medida dispuso que el area de Comunicaciones asuma rango de Ministerio e incluyendo a la Autoridad Federal de Servicios de Comunicacion Audiovisual (AFSCA) y la Au...
Boletin Latinoamericano Y Del Caribe De Plantas Medicinales Y Aromaticas, Nov 1, 2013
Blueberry is a popular natural food product consumed worldwide. Acid soils are found throughout t... more Blueberry is a popular natural food product consumed worldwide. Acid soils are found throughout the world. A significant problem of acid soils is the active aluminum content, which may result toxic to plant. The present study was undertaken to assess the toxicities of Al for Blueberry (Vaccinium corymbosum L.) cultivated in vitro and treated with 100 and 200 μM Al. The effects of Al concentration on malondialdehyde (MDA) content, antioxidant activity and phenolic compounds of blueberry after 7, 14 and 21 days of treatment were established. The analysis of the MDA accumulated in the tissues of the blueberry seedlings indicates that Al concentration increases the damage caused by lipid peroxidation, for both treatments, after 14 days. The highest antioxidant activity in the extracts was observed at 200 μM Al after 14 days of treatment, being chlorogenic and ellagic acids the most significant metabolites involved in the antioxidant properties. Then, the content of Al in soil could be modulate the content of bioactive compounds in blueberry plants.
Plant and Soil, 2013
The trace element uptake process of plants is a key factor in assessing the risks of trace elemen... more The trace element uptake process of plants is a key factor in assessing the risks of trace element build-up in agricultural soils. Scarce information exists on the trace element dynamic uptake of plants grown in the field, especially on those potentially hazardous. In this study, the uptake process of As, Cd, Cu, and Zn in maize plants was quantified and characterized throughout the entire season. Methods Along two seasons, the uptake dynamics of field-grown maize plants in absorbing the soil borne trace elements was examined. Biomass production and the concentration of the elements in plant and soil solution samples were determined. A kinetic model was employed to characterize the uptake by plants. The kinetic parameters of the uptake process, maximum cumulative uptake rate, U max , time to reach 50 % of U max , t U50 , and reciprocal of the uptake rate, b U when followed throughout the season in terms of the plant's growing degree days remained constant between seasons and were element specific. In spite of the large amount biomass produced, maize plants extracted minute quantities of Cd and As. Increasing cumulative uptake rates of As, Cd, Cu, and Zn from the soil took place primarily in the early half of the growing season when the biomass accumulation was still less than 50 % of the maximum harvested biomass. The element-specific plant uptake factor (PUF), which denote the partition of trace elements between the soil solution and plant phases, decreased following
Soil and Sediment Contamination: An International Journal, 2010
... Mesquita, ME and Vieira e Silva, JM 2002. Preliminary study of pH effect in the application o... more ... Mesquita, ME and Vieira e Silva, JM 2002. Preliminary study of pH effect in the application of Langmuir and Freundlich isotherms to Cu-Zn competitive adsorption. ... Environ. Eng. Sci. , 20: 607–616. [CrossRef], [Web of Science ®] View all references; Cazanga et al., 200813. ...
Soil and Sediment Contamination: An International Journal, 2009
Soil and Sediment Contamination, 18:497511, 2009 Copyright © Taylor & Francis Group, LLC... more Soil and Sediment Contamination, 18:497511, 2009 Copyright © Taylor & Francis Group, LLC ISSN: 1532-0383 print / 1549-7887 online DOI: 10.1080/15320380902962320 ... Used in Chile: Phosphorus Fertilizers as a Source ... MAURICIO MOLINA,1 FABI ´AN ABURTO,2 ...
Journal of Non-Crystalline Solids, 2011
The requested paper is not presently available in its full-text version for it has not been suppl... more The requested paper is not presently available in its full-text version for it has not been supplied yet by the researcher in charge of the archiving. * * * * El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.
Environmental Chemistry, 2010
Environmental context. Intensive fertilisation and the availability of phosphorus species (less t... more Environmental context. Intensive fertilisation and the availability of phosphorus species (less than 10%) in cultivable soils of volcanic origin are causing the accumulation of P in these soils. Phosphorus is a macronutrient that severely limits good agricultural development, so knowledge of the distribution and the different forms of P present in soils is fundamental for sustainable agricultural practice. This novel study reports the existence of increased available P in all the soils that received a load of plant ash from different tree species. . The effect associated with the distribution of ash from plantations of native, pine, and eucalyptus forests over five soils of volcanic origin was studied by means of column leaching experiments. The results show a clear increase of pH (up to 4.4 units) and of the soil’s electric conductivity (up to 21 times), whereas total extractable P content increased 3 to 10 times with respect to the control. These effects follow a sequence dependin...
Archives of Agronomy and Soil Science, 2012
Abstract The objective of this study was to evaluate the suitability of the ammonium bicarbonate ... more Abstract The objective of this study was to evaluate the suitability of the ammonium bicarbonate diethylenetriaminepentaacetic acid (AB-DTPA) multiextractant to estimate the available P, exchangeable cations (K, Ca, Mg, Na) and extractable micronutrients (Cu, Fe, ...
introduciéndonos en la construcción del Estado del Arte. El mismo se vincula al Análisis de Discu... more introduciéndonos en la construcción del Estado del Arte. El mismo se vincula al Análisis de Discursos Político-Mediáticos de la línea editorial de los diarios La Nación y Página/12, en torno a la disputa de proyectos político-estratégicos de país rumbo al Ballotage.
Este trabajo es una introduccion al proyecto de investigacion que culminara en nuestro Trabajo In... more Este trabajo es una introduccion al proyecto de investigacion que culminara en nuestro Trabajo Integrador Final, de recorte economico politico y sociocultural, que pretende reflexionar en torno a las relaciones de fuerzas oligopolicas en el sistema de medios de comunicacion masiva a partir de la asuncion de Mauricio Macri como Presidente de la Nacion Argentina. Para eso, cabe destacar las principales politicas comunicacionales de la gestion Cambiemos (incluye DNUs y medidas adoptadas por el Ministerio de Comunicaciones y ENaCom) desarrolladas desde el 10/12/2015 hasta el 01/01/2018 cuando se concreta la fusion Cablevision-Telecom. Al asumir, Mauricio Macri firmo el Decreto de Necesidad y Urgencia n°13/2015, a traves del cual modifico la Ley de Ministerios para reestructurar el esquema ministerial del Poder Ejecutivo. Esta medida dispuso que el area de Comunicaciones asuma rango de Ministerio e incluyendo a la Autoridad Federal de Servicios de Comunicacion Audiovisual (AFSCA) y la Au...