Methodological Underestimation of Oceanic Nitrogen Fixation Rates Mohr, Wiebke ; Großkopf, Tobias ; Wallace, Douglas W. R. ; LaRoche, Julie Abstract Publication: PLoS ONE Pub Date: September 2010 DOI: 10.1371/journal.pone.0012583 Bibcode: 2010PLoSO...512583M