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. 2018 Sep 20;8(4):39. doi: 10.3390/life8040039

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Infrared (IR) micro-spectroscopic analyses of microfossils. (a) Optical microscope image of a filamentous microfossil in Bitter Springs chert and IR map image for 2925 cm⁻¹ peak height due to aliphatic CH₂ modified from Igisu et al. [120]. (b) Schematic images for determining the CH₃/CH₂ peak height ratio (R_3/2). (c) CH₃/CH₂ peak height ratio (R_3/2) of extant prokaryotes (cyanobacteria and E coli), and microfossils from Bitter Springs Group and Gunflint Formation modified from Igisu et al. [121] with copyright permission from the journal. Values for the whole cell, water-soluble (proteins), water-insoluble (membrane), and lipid extracts are also shown for cyanobacteria and E. coli.