title: Design principles of photosynthetic light-harvesting.
abstract: Photosynthetic organisms are capable of harvesting solar energy with near unity quantum efficiency. Even more impressively, this efficiency can be regulated in response to the demands of photosynthetic reactions and the fluctuating light-levels of natural environments. We discuss the distinctive design principles through which photosynthetic light-harvesting functions. These emergent properties of photosynthesis appear both within individual pigment-protein complexes and in how these complexes integrate to produce a functional, regulated apparatus that drives downstream photochemistry. One important property is how the strong interactions and resultant quantum coherence, produced by the dense packing of photosynthetic pigments, provide a tool to optimize for ultrafast, directed energy transfer. We also describe how excess energy is quenched to prevent photodamage under high-light conditions, which we investigate through theory and experiment. We conclude with comments on the potential of using these features to improve solar energy devices.
authors.affiliation: Department of Chemistry, University of California, Berkeley, CA 94720, USA. grfleming@lbl.gov
authors.forename: Graham R
authors.initials: GR
authors.lastname: Fleming
authors.forename: Gabriela S
authors.initials: GS
authors.lastname: Schlau-Cohen
authors.forename: Kapil
authors.initials: K
authors.lastname: Amarnath
authors.forename: Julia
authors.initials: J
authors.lastname: Zaks
mesh_terms: D000460:Chlorophyta / Q000378:metabolism*; D004735:Energy Transfer; D055772:Green Chemistry Technology / Q000295:instrumentation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008027:Light; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry / Q000378:metabolism*; D008958:Models, Molecular; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods*; D010788:Photosynthesis; D012993:Solar Energy / Q000706:statistics & numerical data*; D013050:Spectrometry, Fluorescence
chemical_list: D045342:Light-Harvesting Protein Complexes