Detection of circular polarization in light scattered from photosynthetic microbes
- 12 May 2009
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 106 (19), 7816-7821
- https://doi.org/10.1073/pnas.0810215106
Abstract
The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the universe. A candidate universal biosignature is homochirality, which is likely to be a generic property of all biochemical life. Because of the optical activity of chiral molecules, it has been hypothesized that this unique characteristic may provide a suitable remote sensing probe using circular polarization spectroscopy. Here, we report the detection of circular polarization in light scattered by photosynthetic microbes. We show that the circular polarization appears to arise from circular dichroism of the strong electronic transitions of photosynthetic absorption bands. We conclude that circular polarization spectroscopy could provide a powerful remote sensing technique for generic life searches.Keywords
This publication has 36 references indexed in Scilit:
- Circular polarization in comets: Observations of Comet C/1999 S4 (LINEAR) and tentative interpretationIcarus, 2007
- Origin of mitochondria by intracellular enslavement of a photosynthetic purple bacteriumProceedings Of The Royal Society B-Biological Sciences, 2006
- Carbon‐based ocean productivity and phytoplankton physiology from spaceGlobal Biogeochemical Cycles, 2005
- Near-Infrared Detection of Potential Evidence for Microscopic Organisms on EuropaAstrobiology, 2003
- Bio‐optical properties of oceanic waters: A reappraisalJournal of Geophysical Research: Oceans, 2001
- The Archean Sulfur Cycle and the Early History of Atmospheric OxygenScience, 2000
- ASTRONOMICAL SEARCHES FOR EARTH-LIKE PLANETS AND SIGNS OF LIFEAnnual Review of Astronomy and Astrophysics, 1998
- Pico- and ultraplankton Sargasso Sea communities: variability and comparative distributions of Synechococcus spp. and algaeMarine Ecology Progress Series, 1988
- Chroococcoid cyanobacteria in the sea: A ubiquitous and diverse phototrophic biomass1Limnology and Oceanography, 1979
- Circular Polarization: Jupiter and Other PlanetsNature, 1971