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Raman spectroscopic observation on lichens

A. Crustose lichens on a 1.1 billion-year-old Keweenawan basalt (AKB):

Tiny, soft, white-yellowish microorganisms were found on the original surface of the rock sample. They have almost identical texture. Raman measurements on several organisms yield a Raman spectral pattern dominated by peaks from an ester of a tertiary aliphatic acid, a waxy protective coating exuded to conserve water.

B. Crustose lichens on a Hawaii basalt:

An Hawaii basalt lichens on rock surface Raman spectrum of the lichen -- mainly beta-carotene peaks

 

Reference: Wang et al., abstract #1753 for XXXIV Lunar & Planetary Science Conference, 2003

 

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