Examinando por Materia "Scenedesmus"

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    Efecto de fertilizantes comerciales sobre la producción de biomasa de Scenedesmus obliquus ATCC 11457 a escala piloto
    (Universidad EAFIT, 2021) Londoño Lopera, José Miguel; Miranda Parra, Alejandra María
    The study of microalgae has shown a wide applicability in varied fields as medicine, cosmetology CO2, capture among others. Despite this, the expenses are significant when it comes to producing microalgal biomass at large scale, especially for the cost of the culture medium, which is significantly high, reaching 40 % of the production cost; due to this, ways are being sought to save production processes. For the above, the present study evaluated the effect of two commercial NPK fertilizers have on the cell growth of Scenedesmus obliquus ATCC 11457, in order to propose a culture medium that can be a viable nutrient source and reduce costs of the media. For this, pilot-scale tests were carried out in 20 L photobioreactors, using commercial fertilizers as the culture medium. Crecilizer® and Florilizer® fertilizers were determined to be viable nutrient sources for S. obliquus. The Florilizer® fertilizer presented higher cellular productivity, compared to the traditional medium, 31 % more proteins and a reduction in production cost in culture medium up to 66 %, so this fertilizer is recommended for the production of biomass with high protein content and low cost.
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    Efecto del glicinato de selenio comercial en el crecimiento y bioacumulación de selenio en Chlorella sorokiniana UTEX 1230 y Scenedesmus obliquus ATCC 11457
    (Universidad EAFIT, 2021) Galvis Sánchez, Juan Camilo; Miranda Parra, Alejandra María
    This work aims to evaluate the impact of PROKEL® (glycinte de Se) on the microalgae C. sorokiniana UTEX 1230 and S. obliquus ATCC 11457, with respect to their absorption, bioaccumulation, and toxicity. It was found in the lowest concentrations (5, 10, 20 ppm Se) the visible changes a priori such as the color change and the appearance of small solids that did not correspond to the biomass was much less compared to the control than in the highest (30, 40, 50 ppm Se), also in the latter after day 4, in which there was greater growth of the biomass, it begins to decrease significantly. It was also found that the Se absorbed by the final biomass is much higher than the amounts reported by research in which an inorganic source of Se is used, so it is possible to suggest that this form of organic Se facilitates the uptake of said element with the evaluated microalgae, in addition, a directly proportional relationship between the levels