No evidence for interstellar proteins

Details No evidence for interstellar proteins No evidence for interstellar proteins

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.100..425k&link_type=abstract

Astrophysics and Space Science (ISSN 0004- 640X), vol. 100, no. 1-2, March 1984, p. 425, 426.

Biology

4

Biochemistry, Exobiology, Interstellar Chemistry, Interstellar Matter, Proteins, Molecular Spectra, Tryptophan, Water

Scientific paper

The claim by Karim et al. (1983) that the broad interstellar feature near 280 nm suggests the existence of proteinaceous matter in the interstellar medium is addressed. From astronomical and biochemical arguments it is shown that no quantitative measures of optical depth can be derived from the published data and that there is a great wealth of organic molecules which have absorptions at or near this wavelength interval. The amino acid tryptophan is one such molecule but the deduced spectrum does not satisfy two other properties of its spectrum. In particular, the 280 nm absorption for tryptophan refers to an aqueous solution of the molecule, and no liquid water is expected to exist in the ISM.

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