All Stories

  1. Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth’s oxygenation

    Article • Proceedings of the National Academy of Sciences, March 2022, Proceedings of the National Academy of Sciences

    Roger Summons

  2. Carotenoid biomarkers in Namibian shelf sediments: Anoxygenic photosynthesis during sulfide eruptions in the Benguela Upwelling System

    Article • Proceedings of the National Academy of Sciences, July 2021, Proceedings of the National Academy of Sciences

    Roger Summons

  3. Green sulfur bacteria proliferated unexpectedly late in geological time

    Article • Proceedings of the National Academy of Sciences, July 2020, Proceedings of the National Academy of Sciences

    Roger Summons

  4. Lack of Methylated Hopanoids Renders the Cyanobacterium Nostoc punctiforme Sensitive to Osmotic and pH Stress

    Article • Applied and Environmental Microbiology, April 2017, ASM Journals

    Roger Summons

  5. Biomarkers: Informative Molecules for Studies in Geobiology

    Article • March 2012, Wiley

    Roger Summons