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Applied and Environmental Microbiology, September 2002, p. 4679-4683, Vol. 68, No. 9
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.9.4679-4683.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Comparison of Models Describing Light Dependence of N2 Fixation in Heterocystous Cyanobacteria{dagger}

Marc Staal,1* Sacco te Lintel Hekkert,2 Peter Herman,3 and Lucas J. Stal1

Department of Marine Microbiology,1 Department of Spatial Ecology, NIOO-KNAW, 4400 AC Yerseke,3 Life Science Trace Gas Facility, Department of Molecular and Laser Physics, University of Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands2

Received 29 January 2002/ Accepted 26 June 2002

The abilities of four models to describe nitrogenase light-response curves were compared, using the heterocystous cyanobacterium Nodularia spumigena and a cyanobacterial bloom from the Baltic Sea as examples. All tested models gave a good fit of the data, and the rectangular hyperbola model is recommended for fitting nitrogenase-light response curves. This model describes an enzymatic process, while the others are empirical. It was possible to convert the process parameters between the four models and compare N2 fixation with photosynthesis. The physiological meanings of the process parameters are discussed and compared to those of photosynthesis.

* Corresponding author. Mailing address: NIOO-KNAW, Postbus 140, 4400 NT Yerseke, The Netherlands. Phone: 31 (0)113 577479. Fax: 31 (0)113 573616. E-mail: staal{at}cemo.nioo.knaw.nl.

{dagger} Publication no. 3009 of NIOO-CEMO.

Applied and Environmental Microbiology, September 2002, p. 4679-4683, Vol. 68, No. 9
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.9.4679-4683.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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