Light-harvesting in bacteria exploits a critical interplay between transport and trapping dynamics

Details Light-harvesting in bacteria exploits a critical interplay between transport and trapping dynamics Light-harvesting in bacteria exploits a critical interplay between transport and trapping dynamics

2010-03-11

arxiv.org/abs/1003.2443v1

Phys. Rev. Lett. 104, 158302 (2010)

Physics

Condensed Matter

Soft Condensed Matter

4 pages and 4 figures. Accepted for publication in Physical Review Letters.

Scientific paper

Light-harvesting bacteria Rhodospirillum Photometricum were recently found to adopt strikingly different architectures depending on illumination conditions. We present analytic and numerical calculations which explain this observation by quantifying a dynamical interplay between excitation transfer kinetics and reaction center cycling. High light-intensity membranes (HLIM) exploit dissipation as a photo-protective mechanism, thereby safeguarding a steady supply of chemical energy, while low light-intensity membranes (LLIM) efficiently process unused illumination intensity by channelling it to open reaction centers. More generally, our analysis elucidates and quantifies the trade-offs in natural network design for solar energy conversion.

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