Hydrogen Photoproduction under Continuous Illumination by Sulfur-Deprived, Synchronous Chlamydomonas reinhardtii Cultures

Anatoly Tsygankov, Sergey Kosourov, Michael Seibert, Maria L. Ghirardi

Research output: Contribution to journalArticlepeer-review

113 Scopus Citations

Abstract

Unsynchronized Chlamydomonas reinhardtii cells subsequently deprived of sulfur produce H2 under continuous illumination in the laboratory for 3-4 days. However, cultures grown outdoors will be exposed to day-and-night cycles that may synchronize their growth and cell division. While it is clear that only insignificant amounts of H2 can be produced by sulfur-deprived cells during the night period, little work has been done to examine the effects of the light/dark cycles preceding sulfur deprivation on subsequent H 2 photoproduction. We show that (a) C. reinhardtii cells exhibit synchronized growth and cell division in the presence of acetate, (b) cells with the highest specific rates of H2 photoproduction also have the highest rates of biomass accumulation, and (c) the highest rates of starch and protein degradation coincide with the highest rates of formate and acetate accumulation, but not with H2 photoproduction. This work shows that it is possible to maximize the production of H2 by sulfur-depriving synchronized cultures at about 4 h after the beginning of the light period.

Original languageAmerican English
Pages (from-to)1239-1244
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume27
Issue number11-12
DOIs
StatePublished - 2002
EventBiohydrogen 2002 (BIO-H2) - Ede, Netherlands
Duration: 21 Apr 200221 Apr 2002

NREL Publication Number

  • NREL/JA-590-33324

Keywords

  • Green algae
  • Hydrogen
  • Photoproduction
  • Sulfur deprivation
  • Synchronous growth

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