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Synergistic effect of UV radiation and nutrient limitation on Chlorella fusca (Chlorophyta) cultures grown in outdoor cylindrical photobioreactors
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SYSNO ASEP 0440825 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Synergistic effect of UV radiation and nutrient limitation on Chlorella fusca (Chlorophyta) cultures grown in outdoor cylindrical photobioreactors Author(s) Malpartida, I. (ES)
Jerez, C.G. (ES)
Morales, M.M. (ES)
Nascimento, E. (ES)
Freire, I. (ES)
Ezequiel, J. (ES)
Rico, R.M. (ES)
Peralta, E. (ES)
Malapascua, J.R. (ES)
Florez, Y. (ES)
Masojídek, Jiří (MBU-M) RID, ORCID
Abdala, R. (ES)
Figueroa, F.L. (ES)
Navarro, E. (ES)Number of authors 14 Source Title Aquatic Biology - ISSN 1864-7790
Roč. 22, č. 2 (2014), s. 141-158Number of pages 18 s. Language eng - English Country DE - Germany Keywords bio-optics ; radiation ; Chlorella ; chlorophyll Subject RIV EE - Microbiology, Virology Institutional support MBU-M - RVO:61388971 UT WOS 000345701900011 Annotation 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. Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2015
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