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This article proposes to focus on the importance of epistolary mediation as driving force in the construction of scientific knowledge. It is by analysing the correspondence between phoneticians approached as a textual interaction, considered in its mediatory function and captured through the scientific challenges which permeate it, that we shall illustrate here the contribution of the exchange of

Biochemical aspects of the Xanthophyll cycle

Photosynthesis is the process through which the energy from the sun is converted into chemically bound energy stored in carbohydrates. Due to large variations in light intensities and stress situations, plants must be able to regulate the absorbed energy since excess energy would otherwise damage the plant. One of several photoprotective mechanisms involves the xanthophyll cycle. A copper binding