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Polyphosphate during the Regreening of Chlorella vulgaris under Nitrogen Deficiency

Polyphosphate (Poly-P) accumulation has been reported in Chlorella vulgaris under nitrogen deficiency conditions with sufficient P supply, and the process has been demonstrated to have great impact on lipid productivity. In this article, the utilization of polyphosphates and the regreening process under N resupplying conditions, especially for lipid production reviving, were investigated. This regreening process was completed within approximately 3–5 days. Polyphosphates were first degraded within 3 days in the regreening process, with and without an external P supply, and the degradation preceded the assimilation of phosphate in the media with an external P offering. Nitrate assimilation was markedly influenced by the starvation of P after polyphosphates were exhausted in the medium without external phosphates, and then the reviving process of biomass and lipid production was strictly impeded. It is, thus, reasonable to assume that simultaneous provision of external N and P is essential for overall biodiesel production revival during the regreening process.
- CITY UNIVERSITY OF HONG KONG Hong Kong
- City University of Hong Kong China (People's Republic of)
- State Key Laboratory of Marine Pollution Hong Kong
- CAS Key Laboratory of Urban Pollutant Conversion China (People's Republic of)
- China Jiliang University China (People's Republic of)
Chlorophyll, Magnetic Resonance Spectroscopy, QH301-705.5, Nitrogen, biodiesel production, Article, regreening, phosphate supply, nitrogen deficiency, Polyphosphates, Biomass, Biology (General), QD1-999, <i> </i>regreening, Chlorophyll A, Esters, Lipid Droplets, Chemistry, polyphosphates, <i>Chlorella vulgaris</i>, Chlorella vulgaris
Chlorophyll, Magnetic Resonance Spectroscopy, QH301-705.5, Nitrogen, biodiesel production, Article, regreening, phosphate supply, nitrogen deficiency, Polyphosphates, Biomass, Biology (General), QD1-999, <i> </i>regreening, Chlorophyll A, Esters, Lipid Droplets, Chemistry, polyphosphates, <i>Chlorella vulgaris</i>, Chlorella vulgaris
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