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The heat flux of Tetrahymena thermophila BF5 during growth and the effects of La3+ and Ca2+ on them were investigated with microcalorimetry; simultaneously, morphological changes of T. thermophila were obtained by light microscope. La3+ in low concentration (0–5.0 × 10–4 mol/l) remarkably stimulated T. thermophila metabolism, but high dose of La3+ (5.8–8.6 × 10–4 mol/l) restrained it in a linear manner...
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