Fig. 3: Cellular rates and resource concentrations at a radial distance of 0.027 cm from the center of a particle of radius 0.125 cm.
From: Quantifying nitrogen fixation by heterotrophic bacteria in sinking marine particles
a Size-specific rates of C uptake (dark blue), total respiration (orange), available C for growth (light blue), available N for growth (green), available EA (electron acceptor \({{\rm{O}}}_{2}\), \({{{\rm{NO}}}_{3}}^{-}\), and \({{{\rm{SO}}}_{4}}^{2-}\); yellow), and growth rate of a cell (dashed magenta). Regions I, II, III, and IV represent situations when a cell is limited by C, EA, co-limited by N and EA, N, and showing negative growth rate (see text). b Respiratory costs related to \({{\rm{N}}}_{2}\) fixation in terms of direct respiration, enzyme production, and \({{\rm{O}}}_{2}\) removal. c Glucose, amino acid, and bacterial concentrations in the particle. d Cellular \({{\rm{N}}}_{2}\) fixation rate. e \({{\rm{O}}}_{2}\) and \({{{\rm{NO}}}_{3}}^{-}\) concentrations in the particle. The gray area represents the time interval of \({{\rm{N}}}_{2}\) fixation.
