Khachikyan, A, Milucka, J, Littmann, S, Ahmerkamp, S, Meador, T, Könneke, M, Burg, T and Kuypers, MMM (2019) Direct cell mass measurements expand the role of small microorganisms in nature. Applied and Environmental Microbiology, 85(14). doi:10.1128/AEM.00493-19