DSpace Repository :: Browsing by Subject "BIODEGRADACION"

Browsing by Subject "BIODEGRADACION"

Now showing 1 - 5 of 5

Absorption of siderite within a chemically modified poly(lactic acid) based composite material for agricultural applications
(2018-05) García, Nancy L.; Fascio, Mirta; Errea, María Inés; Dufresne, Alain; Goyanes, Silvia Nair; D'Accorso, Norma Beatriz
"Iron is an essential micronutrient for higher plants. Although abundant in most soils, Fe3+ is not available for plant uptake, because of its poor solubility. Ferrous sulfate is a fertilizer used for crops but, Fe2+ is readily oxidized to the plant-unavailable ferric form. It is therefore important to provide Fe2+ to plants, minimizing the loss of this nutrient by oxidation in Fe3+. This paper reports the development of a composite material consisting of a matrix (PLARAM), obtained by the chemical modification of poly(lactic acid), capable of retaining ferrous carbonate (siderite) within PLARAM (PLARAMFe). From the matrix, Fe2+ is released into the soil, enhancing its bioavailability. PLARAM and PLARAMFe films were obtained and their water wettability was studied. One side of the films was more hydrophilic than the other, turning this material attractive as a protective film when it is necessary to avoid loss of humidity."
Arapey sweet potato peel waste as renewable source of antioxidant: extraction, nanoencapsulation and nanoadditive potential in films
(2021-01) Guerrero-León, Beatriz; Corbino, Graciela; Dufresne, Alain; Errea, María Inés; D'Accorso, Norma Beatriz; García, Nancy L.
"In this work, the peel of Arapey Sweet Potato (Ipomoea batatas), a vegetable waste, was used as a source of phenolic compounds which are widely recognized as beneficial antioxidants for human health. The extract obtained from Ipomoea batatas exhibited an antioxidant activity significantly higher than many antioxidant agents reported in literature (476.96 mg of TROLOX mL-1), as well as good thermal stability. Nanocapsules of the extract coated with low molecular weight polylactic acid were prepared by the emulsification-solvent evaporation method and the nanoparticles obtained were characterized physical; thermal; and morphologically. An analysis of the variables that were investigated to increase the encapsulation efficiency is presented here. Besides, PLA films prepared via the solution-casting method exhibited good compatibility with the nanoparticles loaded with the antioxidant extract, as was evidenced by the uniform and stable dispersion of these particles in the films. Furthermore, an improvement of the mechanical properties of the PLA films due to the presence of the nanoparticles were clearly observed. Results reported here are encourage enough to propose the nanocapsules described in this work as additives or to be used immersed in films for controlled release of antioxidants, putting in value a vegetable waste."
Caracterización de efluentes de cerdos, con énfasis en biodegradabilidad anaeróbica
(2015) Beily, María Eugenia; Pelizzari, Daniel
"A nivel internacional, se ha reconocido la importancia del agua como un recurso escaso, resaltando su valor social, ambiental y económico. En este contexto, conceptos como la gestión integral de los recursos hídricos, el agua virtual y la huella hídrica adquieren relevancia en tanto aportan herramientas para una gestión sustentable. En particular, resulta de interés la aplicación de instrumentos económicos a fin de promover la racionalidad y la eficiencia en la distribución del recurso."
Estudio de la implementación de bolsas plásticas biodegradables u oxobiodegradables, su impacto en el medio ambiente y su comparación con tecnologías alternativas
(2009) Arra, Daniel; Jonas, Félix
"El presente proyecto final plantea una investigación acerca de la implementación de bolsas biodegradables u oxo-biodegradables en el país, analizando los principales drivers que componen el proceso de producción y su posible adaptación a las tecnologías actualmente vigentes. Ante el incremento exponencial en el consumo de bolsas plásticas y efectuando un análisis de medidas aplicadas por distintos países para abordar esta temática, se comparan soluciones viables a ser aplicadas en Argentina. Se concluye que la sustitución de bolsas convencionales por bolsas oxo-biodegradables brindará una reducción en la cantidad de plásticos desechados al medio ambiente, sin impactar de manera significativa en los costos de producción y sin precisar recurrir a la adquisición de maquinarias específicas".
Optimal control of a batch bioreactor: a study on the use of an imperfect model
(2001-12) Dondo, Rodolfo G.; Marqués, Dardo
"This paper presents a numerical study on the performance degradation of a batch bioreactor optimal control strategy when the model used to compute such strategy shows wide variations from the real process. The optimal control was computed using a model that, when exposed to large variations of the control inputs, presents large departures from real process behavior. An improved model based on published experiments was proposed. A new optimal policy was calculated and the behavior of this model when controlled with the earlier policy was studied. Although the earlier control showed a performance degradation with respect to the real optimal control, degradation was modest, and the results are superior to these obtained with other control strategies."

Browsing by Subject "BIODEGRADACION"

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