Diapositive 1 - de l'Université libre de Bruxelles

Chapitre V3535Mineral Mg concentration (mol%MgCO3)30252015105Mineral Mg concentration (mol%MgCO3)3025201510500 2 4 6Solution Mg/Ca (mol/mol)00 2 4 6Solution Mg/Ca (mol/mol)ABFigure 32: Mean magnesium concentration (± S.D., n=4) in minerals precipitated in vitro inpresence of test (A) and spine (B) protein extracts, according to precipitation solution Mg/Ca andprotein concentration (♦ 0 µg/ml, ■ 1µg/ml, ▲ 5 µg/ml and × 10 µg/ml). Skeletal MgCO 3 of past seaurchins grown in different seawater Mg/Ca ratios (●) were calculated from Ries’ (2004) algorithmsfor echinoid plate (Mg/Ca skeleton =(0.000719×T+0.0292)Mg/Ca 0.668 SW ) and spine (Mg/Ca skeleton =(0.000837×T+0.0155) Mg/Ca 0.538 SW ), at 18°C.3535Mineral Mg concentration (mol%MgCO3)30252015105Mineral Mg concentration (mol%MgCO3)3025201510500 2 4 6 8 10 1200 2 4 6 8 10 12Protein concentration (µg/ml)Protein concentration (µg/ml)ABFigure 33: Mean magnesium concentration (± S.D., n=4) in minerals precipitated in vitro inpresence of test (A) and spine (B) protein extracts, according to protein concentration and solutionMg/Ca (♦ 1:1, ■ 3:1, ▲ 4:1, × 5:1 mol/mol).100