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A search for porphyrin biomarkers in nonesuch shale and extraterrestrial samples

An organic solvent extract of billion year old Nonesuch Shale was examined for porphyrins by means of fluorometry and high resolution mass spectrometry. It appears to contain at least three or more classes of ...

Joon H. Rho, A. J. Bauman, Heinz G. Boettger, Teh Fu Yen in Space life sciences (1973)