lipid portion of a thylakoid membrane 39.5: water of the same thickness 33.3 cm/sec
||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 5th paragraphPubMed ID24806920
|| Ligeza, A., Tikhonov, A.N et al., Oxygen permeability of thylakoid membranes: electron paramagnetic resonance spin labeling study. Biochim. Biophys. Acta. 1998 1365: 453–463  Liberton, M., Howard Berg, R. et al., Ultrastructure of the membrane systems in the unicellular cyanobacterium Synechocystis sp. strain PCC 6803. Protoplasma. 2006 227: 129–138 DOI: 10.1007/s00709-006-0145-7PubMed ID9711298, 16736255
||P.1883 right column 5th paragraph: "The oxygen permeability coefficient for the lipid portion of a thylakoid membrane was measured by Ligeza et al. to be 39.5 cm/s (primary source 35). Note that the permeability of oxygen through water of the same thickness (Δr = 6 nm (primary source 36)) is Pwater = D/Δr =33.3 cm/s. In other words, the lipid portion of the membrane is not a barrier to oxygen diffusion."