量子效应有助细胞捕捉阳光

Sophisticated recent experiments with ultrashort laser pulses support the idea that intuition-defying quantum interactions between molecules ¹ help plants, algae²（藻类）, and some bacteria efficiently ³ gather light to fuel their growth. But key details of nature's vital light-harvesting mechanisms ⁴ 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 ⁵ 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 ⁶ molecules re-emit light of different colors in the ensuing（接着发生的） instants. This allows investigators ⁷ 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 discrete⁸（离散的） entities ⁹ moving randomly ¹⁰ between molecules. Rather, the insights of quantum mechanics are needed., ,Quantum mechanics envisages ¹¹ particles as being smeared ¹² over regions of space, rather than being pointlike, and as interfering ¹³ with each other like waves. The smearing ¹⁴ is undetectable in everyday life, but the experimental results indicate that, within arrays of light-harvesting molecules that serve as light " antennas ¹⁵" inside cells, such " coherence ¹⁶" eases ultrafast energy transfers that help organisms use solar energy. It thus allows life to pervade ¹⁷ the planet, using the process known as photosynthesis¹⁸（光合作用） to extract carbon dioxide from the air., ,Yet Anna and her colleagues point out that the molecular ¹⁹ details of the light- gathering ²⁰ apparatus ²¹ 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 ²² and redistribute and repair their components ²³ when the need arises, as living cells do.