Sabiia Seb
        Busca avançada

Botão Atualizar

Botão Atualizar

Registro completo
Provedor de dados:  5
País:  France
Título:  How do microalgae perceive light in a high-rate pond? Towards more realistic Lagrangian experiments
Autores:  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
Data:  2018-05
Ano:  2018
Palavras-chave:  Photosynthesis
Dunaliella salina
Non-photochemical quenching
Resumo:  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.
Tipo:  Text
Idioma:  Inglês

Editor:  Royal Soc
Formato:  application/pdf
Fonte:  Royal Society Open Science (2054-5703) (Royal Soc), 2018-05 , Vol. 5 , N. 5 , P. 180523 (14p.)
Direitos:  2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.


restricted use

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC:

Valid HTML 4.01 Transitional