||Kihara S, Hartzler DA, Savikhin S. Oxygen concentration inside a functioning photosynthetic cell. Biophys J. 2014 May 6 106(9):1882-9. doi: 10.1016/j.bpj.2014.03.031 p.1883 right column 3rd paragraphPubMed ID24806920
|| St-Denis, C.E. and Fell, C.J.D. Diffusivity of oxygen in water. Can. J. Chem. Eng. 1971 49: 885
||P.1883 right column 3rd paragraph: "In homogeneous media at fixed temperature, the diffusion coefficient, D, is constant and the flux of particles is proportional to the concentration gradient and occurs in the direction of lower concentration. The above equation will be used to describe oxygen diffusion through the water surrounding photosynthetic cells, for which D = 2.0 × 10^-9 m^2/s at room temperature (primary source)."