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8 pages, 2 figures, 4 tables.It is frequent to observe disagreements between the relationships RC =-ΔO2/ΔC and RN = -ΔO2/ΔN found\udduring photosynthesis-mineralisation studies in the ocean and those expected according to the Redfield plankton composition.\udThat is because RC and RN depend on the C/N and Carbohydrates/Lipids ( Cbh/Lip) ratios of the organic matter.\udStarting from the mean biochemical composition of the main groups of phytoplankton biomolecules and from the stoichiometry\udof photosynthesis-mineralisation, we establish a new formulation to enable us to calculate RC and RN as a function\udof C/N and Cbh/Lip ratios independent of the variance in the N/P ratio. The approach proposed here permits the theoretical\udlimits of RC and RN to be calculated. The RC value can vary between 1 and 1.58 while RN can vary between 5.8 and\udinfinity with the interrelationships between the ratios being defined by RN/RC=C/N which, in its turn, can vary between\ud3.67 and infinity. For a given RC the limits of RN become narrower and vice versa. When C/N ratio is fixed the limits of\udthe RC and RN values also become narrower. A graphic representation to check and visualise these limits and other experimental\udbiochemical composition values is developed. According to the average value of the Cbh/Lip relationship, 0.82 in\udcarbon, recovered from the literature and for a C/N = 106/16, the estimate mean RC and RN values are 1.41 and 9.33 respectively\udwhich are coincident with previous ratios given by other authors.Peer reviewe

Theoretical limits of oxygen:carbon and oxygen:nitrogen ratios during photosynthesis and mineralisation of organic matter in the sea