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    Synergistic carbon metabolism in a fast growing mixotrophic freshwater microalgal species Micractinium inermum

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    Authors
    Smith, Richard T.
    Bangert, Krys
    Wilkinson, Stephen J.
    Gilmour, D. James
    Affiliation
    University of Sheffield ; University of Sheffield ; University of Sheffield/University of Chester ; University of Sheffield
    Publication Date
    2015-05-11
    
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    Abstract
    In recent years microalgae have attracted significant interest as a potential source of sustainable biofuel. Mixotrophic microalgae are able to simultaneously photosynthesise while assimilating and metabolising organic carbon. By combining autotrophic and heterotrophic metabolic pathways biomass productivity can be significantly increased. In this study, acetate-fed mixotrophic Micractinium inermum cultures were found to have a specific growth rate 1.74 times the sum of autotrophic and heterotrophic growth. It was hypothesised that gas exchange between the two metabolic pathways within mixotrophic cultures may have prevented growth limitation and enhanced growth. To determine the extent of synergistic gas exchange and its influence on metabolic activity, dissolved inorganic carbon (DIC), dissolved oxygen (DO) and photosynthesis and respiration rates were measured under different trophic conditions. A 32.7 fold and 2.4 fold increase in DIC and DO concentrations, relative to autotrophic and heterotrophic cultures respectively, were coupled with significant increases in rates of photosynthesis and respiration. These data strongly support the hypothesis of mixotrophic gas exchange within M. inermum cultures. In addition to enhanced growth, this phenomenon may provide reductions in aeration and oxygen stripping costs related to microalgae production.
    Citation
    Biomass and Bioenergy, 2015
    Publisher
    Elsevier
    Journal
    Biomass and Bioenergy
    URI
    http://hdl.handle.net/10034/552892
    DOI
    10.1016/j.biombioe.2015.04.023
    Additional Links
    http://www.sciencedirect.com/science/journal/09619534
    http://www.sciencedirect.com/science/article/pii/S0961953415001592#
    Type
    Article
    Language
    en
    Description
    This article is available open access at http://www.sciencedirect.com/science/article/pii/S0961953415001592#
    ISSN
    0961-9534
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biombioe.2015.04.023
    Scopus Count
    Collections
    Chemical Engineering

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