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Fig. 2. Linear relationships between ß-carotene 15,15'-dioxygenase activity [pmol retinal/(h.mg protein)] and either A) iron concentration or B) copper concentration in rat small intestine. Individual values are shown for the four dietary groups according to the following: (
) copper-adequate, normal iron (NFe); (
) copper-adequate, high iron (HFe); (bull;) copper-deficient, NFe; and (
) copper-deficient, HFe (see Fig. 1 for diet composition). The coefficients of correlation r1 (dioxygenase versus iron) and r2 (dioxygenase versus copper) were obtained by simple-regression analysis; test of significance of the linear relationships was determined by ANOVA.
