Sophisticated recent experiments with ultrashort laser pulses support the idea that intuition-defying quantum interactions between molecules help plants, algae, and some bacteria efficiently gather light to fuel their growth. But key details of nature's vital light-harvesting mechanisms remain obscure, and the exact role that quantum physics may play in understanding them is more subtle than was once thought, according to an Overview Article in the January issue of BioScience.
The article, by Jessica M. Anna and Gregory D. Scholes of the University of Toronto and Rienk van Grondelle of Vrije Universiteit in Amsterdam, describes experiments that employ a technique called 2-D electronic spectroscopy. Researchers flash laser pulses at the light-harvesting protein molecules of bacteria and algae, timed to within a billionth of a billionth of a second, then observe how the energized molecules re-emit light of different colors in the ensuing instants. This allows investigators to deduce how energy is stored by and moves among the molecules. But the results would be impossible to explain if captured light energy were conveyed by discrete entities moving randomly between molecules. Rather, the insights of quantum mechanics are needed.
Quantum mechanics envisages particles as being smeared over regions of space, rather than being pointlike, and as interfering with each other like waves. The smearing is undetectable in everyday life, but the experimental results indicate that, within arrays of light-harvesting molecules that serve as light "antennas" inside cells, such "coherence" eases ultrafast energy transfers that help organisms use solar energy. It thus allows life to pervade the planet, using the process known as photosynthesis to extract carbon dioxide from the air.
Yet Anna and her colleagues point out that the molecular details of the light-gathering apparatus have evolved very differently in different species, so there is nothing simple about how organisms exploit quantum coherence. Indeed, coherence, contrary to what some researchers have speculated, does not seem to dominate light gathering by providing an express route for conveying energy from where it is first captured to the chemical reaction center where it is used. Instead, Anna and her colleagues write, researchers should "inquire how coherence on short length and time scales might seed some kind of property or function" in light-gathering systems. Such understanding might help scientists devise environmentally friendly solar technologies that could regulate their rate of energy input and redistribute and repair their components when the need arises, as living cells do.
The complete list of peer-reviewed articles in the January 2014 issue of BioScience is as follows:
Changing Ecosystem Dynamics in the Laurentian Great Lakes: Bottom-Up and Top-Down Regulation
David B. Bunnell, Richard P. Barbiero, Stuart A. Ludsin, Charles P. Madenjian, Glenn J. Warren, David M. Dolan, Travis O. Brenden, Ruth Briland, Owen T. Gorman, Ji X. He, Thomas H. Johengen, Brian F. Lantry, Barry M. Lesht, Thomas F. Nalepa, Stephen C. Riley, Catherine M. Riseng, Ted J. Treska, Iyob Tsehaye, Maureen G. Walsh, David M. Warner, and Brian C. Weidel
A Little Coherence in Photosynthetic Light Harvesting
Jessica M. Anna, Gregory D. Scholes, and Rienk van Grondelle
Improving Higher-Order Thinking and Knowledge Retention in Environmental Science Teaching
Marion Dresner, Catherine de Rivera, Kerissa Fuccillo, and Heejun Chang
Linking Biodiversity and Ecosystem Services: Current Uncertainties and the Necessary Next Steps
Patricia Balvanera, Ilyas Siddique, Laura Dee, Alain Paquette, Forest Isbell, Andrew Gonzalez, Jarrett Byrnes, Mary I. O'Connor, Bruce A. Hungate, and John N. Griffin
Broadening the Case for Invasive Species Management to Include Impacts on Ecosystem Services
Jennifer L. Funk, Virginia Matzek, Matthew Bernhardt, and Doug Johnson
All articles in the January issue of BioScience are now published as Advance Access at http://bioscience.oxfordjournals.org/content/early/recent .
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