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Modelling light-dark regime influence on the carbon-nitrogen metabolism in a unicellular diazotrophic cyanobacterium

Grimaud, Ghjuvan Micaelu LU orcid ; Dron, Anthony ; Rabouille, Sophie ; Sciandra, Antoine and Bernard, Olivier (2013) 12th IFAC Symposium on Computer Applications in Biotechnology, CAB 2013 In IFAC Proceedings Volumes (IFAC-PapersOnline) 12(PART 1). p.187-192
Abstract

We propose a dynamical model depicting nitrogen (N2) fixation (diazotrophy) in a unicellular cyanobacterium, Crocosphaera watsonii, grown under light limitation and obligate diazotrophy. In this model, intracellular carbon and nitrogen are both divided into a structual pool and a storage pool. An internal pool that explicitly describes the nitrogenase enzyme is also added. The model is successfully validated with continuous culture experiments of C. watsonii under three light regimes, indicating that proposed mechanisms accurately reproduce the growth dynamics of this organism under various light environments. Then, a series of model simulations is run for a range of light regimes with different photoperiods and daily light... (More)

We propose a dynamical model depicting nitrogen (N2) fixation (diazotrophy) in a unicellular cyanobacterium, Crocosphaera watsonii, grown under light limitation and obligate diazotrophy. In this model, intracellular carbon and nitrogen are both divided into a structual pool and a storage pool. An internal pool that explicitly describes the nitrogenase enzyme is also added. The model is successfully validated with continuous culture experiments of C. watsonii under three light regimes, indicating that proposed mechanisms accurately reproduce the growth dynamics of this organism under various light environments. Then, a series of model simulations is run for a range of light regimes with different photoperiods and daily light doses. Results reveal how nitrogen and carbon are coupled, through the diel cycle, with nitrogenase dynamics, whose activity is constrained by the light regime. We finally identify optimal productivity conditions.

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author
; ; ; and
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
keywords
Cyanobacteria, Dynamic modelling, Light regime, Optimum
host publication
12<sup>th</sup> IFAC Symposium on Computer Applications in Biotechnology, CAB 2013 - Proceedings
series title
IFAC Proceedings Volumes (IFAC-PapersOnline)
volume
12
issue
PART 1
edition
PART 1
pages
6 pages
publisher
IFAC Secretariat
conference name
12th IFAC Symposium on Computer Applications in Biotechnology, CAB 2013
conference location
Mumbai, India
conference dates
2013-12-16 - 2013-12-18
external identifiers
  • scopus:84896337815
ISSN
1474-6670
ISBN
9783902823588
DOI
10.3182/20131216-3-IN-2044.00025
language
English
LU publication?
no
id
dd49763a-23b5-4cf6-b7fb-e63e12f9247b
date added to LUP
2025-04-28 10:21:52
date last changed
2025-04-30 03:33:33
@inproceedings{dd49763a-23b5-4cf6-b7fb-e63e12f9247b,
  abstract     = {{<p>We propose a dynamical model depicting nitrogen (N<sub>2</sub>) fixation (diazotrophy) in a unicellular cyanobacterium, Crocosphaera watsonii, grown under light limitation and obligate diazotrophy. In this model, intracellular carbon and nitrogen are both divided into a structual pool and a storage pool. An internal pool that explicitly describes the nitrogenase enzyme is also added. The model is successfully validated with continuous culture experiments of C. watsonii under three light regimes, indicating that proposed mechanisms accurately reproduce the growth dynamics of this organism under various light environments. Then, a series of model simulations is run for a range of light regimes with different photoperiods and daily light doses. Results reveal how nitrogen and carbon are coupled, through the diel cycle, with nitrogenase dynamics, whose activity is constrained by the light regime. We finally identify optimal productivity conditions.</p>}},
  author       = {{Grimaud, Ghjuvan Micaelu and Dron, Anthony and Rabouille, Sophie and Sciandra, Antoine and Bernard, Olivier}},
  booktitle    = {{12<sup>th</sup> IFAC Symposium on Computer Applications in Biotechnology, CAB 2013 - Proceedings}},
  isbn         = {{9783902823588}},
  issn         = {{1474-6670}},
  keywords     = {{Cyanobacteria; Dynamic modelling; Light regime; Optimum}},
  language     = {{eng}},
  number       = {{PART 1}},
  pages        = {{187--192}},
  publisher    = {{IFAC Secretariat}},
  series       = {{IFAC Proceedings Volumes (IFAC-PapersOnline)}},
  title        = {{Modelling light-dark regime influence on the carbon-nitrogen metabolism in a unicellular diazotrophic cyanobacterium}},
  url          = {{http://dx.doi.org/10.3182/20131216-3-IN-2044.00025}},
  doi          = {{10.3182/20131216-3-IN-2044.00025}},
  volume       = {{12}},
  year         = {{2013}},
}