Abstract
IN some micro-organisms β-galactosidase (lactase) is an adaptive enzyme, that is, its biosynthesis is induced by external agents such as lactose or lactose-related substances1. Apparently this is not the case for the intestinal β-galactosidase of the rat, since a lactose-rich diet does not modify the intestinal specific activity2. In the work reported here, the behaviour of this enzyme has been investigated in the albino rat, starting from the last third of the intra-uterine life until adult age.
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References
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ALVAREZ, A., SAS, J. β-Galactosidase Changes in the Developing Intestinal Tract of the Rat. Nature 190, 826–827 (1961). https://doi.org/10.1038/190826b0
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DOI: https://doi.org/10.1038/190826b0
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