Abstract:
:Heterocystous filamentous cyanobacterium Anabaena cylindrica B629 and nonheterocystous filamentous cyanobacterium Oscillatoria sp. strain Miami BG7 were cultured in media with N(2) as the sole nitrogen source; and activities of oxygen-dependent hydrogen uptake, photohydrogen production, photooxygen evolution, and respiration were compared amperometrically under the same or similar experimental conditions for both strains. Distinct differences in these activities were observed in both strains. The rates of hydrogen photoproduction and hydrogen accumulation were significantly higher in Oscillatoria sp. strain BG7 than in A. cylindrica B629 at every light intensity tested. The major reason for the difference was attributable to the fact that the heterocystous cyanobacterium had a high rate of oxygen-dependent hydrogen consumption activity and the nonheterocystous cyanobacterium did not. The activity of oxygen photoevolution and respiration also contributed to the difference. Oscillatoria sp. strain BG7 had lower O(2) evolution and higher respiration than did A. cylindrica B629. Thus, the effect of O(2) on hydrogen photoproduction was minimized in Oscillatoria sp. strain BG7.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Kumazawa S,Mitsui Adoi
10.1128/AEM.50.2.287-291.1985keywords:
subject
Has Abstractpub_date
1985-08-01 00:00:00pages
287-91issue
2eissn
0099-2240issn
1098-5336journal_volume
50pub_type
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