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Le role des yeux, et plus precisement des pigments ommatidiens, dans le controle des rythmes quotidiens de deplacement de Daphnia longispina est etudie. En eclairement constant (LL) au laboratoire, les modifications pigmentaires sont globalement identiques a celles observees in situ, hormis dans le temps, au voisinage du crepuscule. Les changements dans l'oeil en LL precedent la remontee des daphnies,...
Abstract: From February to August 1996, the following parameters were determined in surface water samples from an oligotrophic reservoir: concentrations of dissolved combined amino acids (DCAA), monosaccharides (DFCHO) and polysaccharides (DCCHO); activities of glycolytic and proteolytic enzymes associated with three size fractions (0-0.2 m, 0.2-2 m, and 2-100 m); densities and biomass of free-living...
Alkaline phosphatase activity (ALP) (EC: 3.1.3.1) presents a nycthemeral variation in both Microcystis aeruginosa (cyanobacterium) and Synedra capitata (diatom) species. Nevertheless, a comparative study reveals differences between the enzymatic behaviour of these two species. ALP is 33 times higher in cyanobacteria than in diatoms under similar experimental conditions. Microcystis aeruginosa presents...
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