Hydrogen production under salt stress conditions by a freshwater Rhodopseudomonas palustris strain View Full Text


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Article Info

DATE

2016-03

AUTHORS

Alessandra Adessi, Margherita Concato, Andrea Sanchini, Federico Rossi, Roberto De Philippis

ABSTRACT

Hydrogen represents a possible alternative energy carrier to face the growing request for energy and the shortage of fossil fuels. Photofermentation for the production of H2 constitutes a promising way for integrating the production of energy with waste treatments. Many wastes are characterized by high salinity, and polluted seawater can as well be considered as a substrate. Moreover, the application of seawater for bacterial culturing is considered cost-effective. The aims of this study were to assess the capability of the metabolically versatile freshwater Rhodopseudomonas palustris 42OL of producing hydrogen on salt-containing substrates and to investigate its salt stress response strategy, never described before. R. palustris 42OL was able to produce hydrogen in media containing up to 3 % added salt concentration and to grow in media containing up to 4.5 % salinity without the addition of exogenous osmoprotectants. While the hydrogen production performances in absence of sea salts were higher than in their presence, there was no significant difference in performances between 1 and 2 % of added sea salts. Nitrogenase expression levels indicated that the enzyme was not directly inhibited during salt stress, but a regulation of its expression may have occurred in response to salt concentration increase. During cell growth and hydrogen production in the presence of salts, trehalose was accumulated as a compatible solute; it protected the enzymatic functionality against salt stress, thus allowing hydrogen production. The possibility of producing hydrogen on salt-containing substrates widens the range of wastes that can be efficiently used in production processes. More... »

PAGES

2917-2926

References to SciGraph publications

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  • 2000-10. Physiological roles of trehalose in bacteria and yeasts: a comparative analysis in ARCHIVES OF MICROBIOLOGY
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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00253-016-7291-4

    DOI

    http://dx.doi.org/10.1007/s00253-016-7291-4

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1052648822

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/26762392


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