Classification of Precambrian microfossils using micro-FTIR spectroscopy

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We conducted micro-Fourier Transform Infrared spectroscopic measurements on extant and fossil microbes. IR signatures of aliphatic hydrocarbons(CH_2 and CH_3) in extant bacteria and archaea show domain-specific signatures, thus could be useful for fast and effective domain-level diagnosis of bacteria and archarea. Those in phosphatic embryo-like fossils suggest that these microfossils have more diverse origin than previously recognized on the basis of their morphology.