FN Archimer Export Format
PT J
TI How do microalgae perceive light in a high-rate pond? Towards more realistic Lagrangian experiments
BT 
AF DEMORY, David
   COMBE, Charlotte
   HARTMANN, Philipp
   TALEC, Amelle
   PRUVOST, Eric
   HAMOUDA, Raouf
   SOUILLE, Fabien
   LAMAREA, Pierre-Olivier
   BRISTEAU, Marie-Odile
   SAINTE-MARIE, Jacques
   RABOUILLE, Sophie
   MAIRET, Francis
   SCIANDRA, Antoine
   BERNARD, Olivier
AS 1:1,2,3;2:1,2,3;3:1,2,3;4:1,3;5:1,3;6:4;7:4;8:2,4;9:4;10:4;11:1,3;12:2,5;13:1,2,3;14:1,2,3;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:PDG-RBE-BRM-LPBA;13:;14:;
C1 UPMC Univ Paris 06, Sorbonne Univ, LOV, Observ Oceanol,UMR 7093, F-06230 Villefranche Sur Mer, France.
   Univ Cote Azur, INRIA, BIOCORE, BP93, F-06902 Sophia Antipolis, France.
   CNRS, LOV, Observ Oceanol, UMR 7093, F-06230 Villefranche Sur Mer, France.
   INRIA Paris, Team Ange, 2 Rue Simone Iff,CS 42112, F-75589 Paris 12, France.
   IFREMER, PBA, F-44311 Nantes, France.
C2 UNIV PARIS 06, FRANCE
   INRIA, FRANCE
   UNIV PARIS 06, FRANCE
   INRIA, FRANCE
   IFREMER, FRANCE
SI NANTES
SE PDG-RBE-BRM-LPBA
IN WOS Ifremer jusqu'en 2018
   DOAJ
   copubli-france
   copubli-univ-france
IF 2.515
TC 21
UR https://archimer.ifremer.fr/doc/00445/55692/57352.pdf
LA English
DT Article
DE ;photosynthesis;hydrodynamics;modelling;photoacclimation;Dunaliella salina;non-photochemical quenching
AB Hydrodynamics in a high-rate production reactor for microalgae cultivation affects the light history perceived by cells. The interplay between cell movement and medium turbidity leads to a complex light pattern, whose forcing effects on photosynthesis and photoacclimation dynamics are nontrivial. Hydrodynamics of high density algal ponds mixed by a paddle wheel has been studied recently, although the focus has never been on describing its impact on photosynthetic growth efficiency. In this multidisciplinary downscaling study, we first reconstructed single cell trajectories in an open raceway using an original hydrodynamical model offering a powerful discretization of the Navier-Stokes equations tailored to systems with free surfaces. The trajectory of a particular cell was selected and the associated high-frequency light pattern was computed. This light pattern was then experimentally reproduced in an Arduino-driven computer controlled cultivation system with a low density Dunaliella salina culture. The effect on growth and pigment content was recorded for various frequencies of the light pattern, by setting different paddle wheel velocities. Results show that the frequency of this realistic signal plays a decisive role in the dynamics of photosynthesis, thus revealing an unexpected photosynthetic response compared to that recorded under the on/off signals usually used in the literature. Indeed, the light received by a single cell contains signals from low to high frequencies that nonlinearly interact with the photosynthesis process and differentially stimulate the various time scales associated with photoacclimation and energy dissipation. This study highlights the need for experiments with more realistic light stimuli to better understand microalgal growth at high cell densities. An experimental protocol is also proposed, with simple, yet more realistic, step functions for light fluctuations. 
PY 2018
PD MAY
SO Royal Society Open Science
SN 2054-5703
PU Royal Soc
VL 5
IS 5
UT 000433498000127
DI 10.1098/rsos.180523
ID 55692
ER

EF