Figure F281. Epifluorescent image of an acridine orange–stained sample from methanogen enrichment media innoculated with an interior piece of Section 305-U1309D-122R-2. Red and green fluorescence of micrometer-sized particles may be indicative of the presence of microorganisms or of rock particles that autofluoresce (field of view = 175 × 135 µm.). Arrows indicate both green and red fluorescent cell-like structures.
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