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Figure 6


Fig. 6. Mantle metabolic status and mean mantle pressure amplitude (MMPA) vs temperature. (A) MMPA maxima encountered in animals 1 and 5; (B) concomitant changes in [Pi] and free energy change of ATP hydrolysis (dG/d{zeta}) in the radial muscle compartment, based on the assumption that observed changes in in vivo 31P NMR spectra solely represent the situation in working radial muscles (see text). Animal 1 had the lowest and animal 5 had the highest thermal tolerance of all animals investigated. Still, both show a tight correlation between stagnating and, eventually, decreasing, pressure amplitudes once |dG/d{zeta} | decreases (the other three animals show similar patterns; data not shown).





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