Characterization of a dense, purple sulfur bacterial layer in a meromictic salt lake Overmann, Jörg ; Beatty, J. Thomas ; Hall, Ken J. ; Pfennig, Norbert ; Northcote, Tom G. Abstract Publication: Limnology and Oceanography Pub Date: July 1991 DOI: 10.4319/lo.1991.36.5.0846 Bibcode: 1991LimOc..36..846O