Photometric and photo accoustic measurement of the absorbance of micro-organisms and its relation to the micro-organism-grain hypothesis |
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| Authors: | S Yabushita K Wada T Inagaki T Ito |
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| Institution: | (1) Department of Applied Mathematics and Physics, Kyoto University, Japan;(2) Department of Nuclear Engineering, Kyoto University, Japan;(3) Department of Physics, Osaka Kyoiku University, Tennoji, Japan;(4) Institute of Physics, College of Arts and Sciences, University of Tokyo, Meguroku, Japan |
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| Abstract: | Absorption ofE. Coli and other micro-organisms are measured by the standard optical spectroscopy and by the photo-accoustic method. The former method does not yield an extinction peak at  =220 nm but yields a weak one at =270 nm, while by the latter method absorption peaks at =220 nm and a weaker one at =270 nm have been found for the spore of Bacillus subtilis. The well-known amino-acid, triptophan shows absorption peaks at =220 and 280 nm. It is tentatively concluded that for the micro-organism model of interstellar grains to be viable, they may have to be spores rather than ordinary cells. |
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