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http://hdl.handle.net/10773/22812
Title: | Synergistic effect of UV radiation and nutrient limitation on chlorella fusca (Chlorophyta) cultures grown in outdoor cylindrical photobioreactors |
Author: | Malpartida, I. Jerez, C. G. Morales, M. M. Nascimento, P. Freire, I. Ezequiel, J. Rico, R. M. Peralta, E. Malapascua, J. R. Florez, Y. Masojidek, J. Abdala, R. Figueroa, F. L. Navarro, E. |
Keywords: | Bio-optic Biochemical composition Chlorella fusca In vivo chlorophyll fluorescence Lipid peroxidation Lipids Photosynthetic pigments Proteins UV radiation |
Issue Date: | 2014 |
Publisher: | Inter Research |
Abstract: | This study assessed the interactive effects of UVR and nutrient depletion on Chlorella fusca cultures on the production and accumulation of particular biomolecules. To accomplish this, algae were grown for 5 d in outdoor thin-layer cascade cultivators under 3 nutrient treatments (full nutrients, -N and -S) and then transferred to outdoor cylindrical photobiore-actors for another 5 d. Cultures were then exposed to full solar radiation (PAB) and decreased UVR. During the last 5 d, bio-optical properties, photosynthetic activity, pigments, biochemical composition and oxidative stress were assessed. Initially, nutrient depletion caused changes in productivity and cell number in a manner that affected biochemical composition. After 3 d, the percentage of lipids in the cultures under N deprivation reached values appropriate for being used as feed or food additives or for energy applications (35% of lipid content), regardless of the light conditions. A longer exposure (5 d) resulted in interactive effects of light and nutrient conditions. Specifically, PAB increased lipid content in all cases (1.3- to 2.3-fold), but particularly under S deprivation. Longer exposure to PAB also increased oxidative stress in UVR and nutrient-limited treatments (-N and -S). These results showed that the benefits expected from nutrient depletion (increase in biomolecule content e.g. lipids, carbohydrates and pigments) were modulated by the negative effects of algal UVR acclimation costs. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/22812 |
DOI: | 10.3354/ab00595 |
ISSN: | 1864-7782 |
Appears in Collections: | CESAM - Artigos DBio - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Malpartida et al. - 2014 - Synergistic effect of UV radiation and nutrient li.pdf | 512.74 kB | Adobe PDF | View/Open |
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