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 λ=220 nm but yields a weak one at λ=270 nm, while by the latter method absorption peaks at λ=220 nm and a weaker one at λ=270 nm have been found for the spore of Bacillus subtilis. The well-known amino-acid, triptophan shows absorption peaks at λ=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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Greenberg, J. M.: 1984,Observatory 104, 134.
Hoyle, F. and Wickramasinghe, N. C.: 1979,Astrophys. Space Sci. 66, 77.
Hoyle, F., Wickramasinghe, N. C., Jansz, E. R., and Jayatissa, P. M.: 1983,Astrophys. Spaci Sci. 95, 227.
Hoyle, F., Wickramasinghe, N. C., and Al-Mufti, S.: 1985,Astrophys. Space Sci. 111, 65.
Inagaki, T., Ito, A., Motosuga, M., Hieda, D., Kobayashi, K., Maezawa, H., and Ito, T.: 1985,Photochem. Photobiol. 41, 527.
Karim, L. M., Hoyle, F., and Wickramasinghe, N. C.: 1983,Astrophys. Space Sci. 94, 223.
McLachlan, A. and Nandy, K.: 1984,Observatory 104, 31.
Sutherland, J. C.: 1976, in A. Castellani and I. F. Quercia (eds.),Synchrotron Radiation Applied to Biophysical and Biological Research, Plenum Press, New York.
Yabushita, S. and Wada, K.: 1985,Astrophys. Space Sci. 111, 405.
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Yabushita, S., Wada, K., Inagaki, T. et al. Photometric and photo accoustic measurement of the absorbance of micro-organisms and its relation to the micro-organism-grain hypothesis. Astrophys Space Sci 117, 401–406 (1985). https://doi.org/10.1007/BF00650165
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DOI: https://doi.org/10.1007/BF00650165