REFERENCES
- Asp, N. G., Berg, N. O., Dahlqvist, A., Jussila, J. & Salmi, H. 1971. The activity of three different small-intestinal β-galactosidases in adults with and without lactase deficiency. Scand. J. Gastroent. 6, 755–762.
- Asp, N. G. & Dahlqvist, A. 1971. Assay of 2-naphthyl β-galactosidase activity. Analyt. Biochem. 42, 275–280.
- Asp, N. G. & Dahlqvist, A. 1972. Human small intestine β-galactosidases: specific assay of three different enzymes. Analyt. Biochem. 47, 527–538.
- Bessey, O. A., Lowry, O. H. & Brock, M. J. 1946. A method for the rapid determination of alkaline phosphatase with five cubic millimeters of serum. J. biol. Chem. 164, 321–329.
- Brown, A. L. 1962. Microvilli of the human jejunal epithelial cell. J. Cell Biol. 12, 623–627.
- Clark, B. & Porteous, J. W. 1963. The intracellular location and metal-ion activation of the alkaline β-glycerophosphatase of rabbit small intestine. Biochem. J. 88, 20p–21p.
- Crane, R. K. 1968. Digestion and absorption of carbohydrates, pp. 25–51 in Dickens, F., Randle, P. J. & Whelan, W. J. (eds.) Carbohydrate Metabolism and Its Disorders. Vol. 1, Academic Press, London and New York.
- Dahlqvist, A. 1968. Assay of intestinal disaccharidases. Analyt. Biochem. 22, 99–107.
- Dahlqvist, A. & Asp, N. G. 1971. Accurate assay of low intestinal lactase activity with a fluorimetric method. Analyt. Biochem. 44, 654–657.
- Eggstein, M. & Kreutz, F. H. 1955. Vergleichende Untersuchungen zur quantitativen Eiweissbestimmung im Liquor und Eiweissarmen Lösungen. Klin. Wschr. 33, 879–884.
- Eichholz, A. 1968. Studies on the organization of the brush border in intestinal epithelial cells. Subfractionation of enzymatic activities of the microvillus membrane. Biochim. biophys. Acta (Amst.) 163, 101–107.
- Fortin-Magana, R., Hurwitz, R., Herbst, J. J. & Kretchmcr, N. 1970. Intestinal enzymes: indicators of proliferation and differentiation in the jejunum. Science 167, 1627–1628.
- Grey, R. D. & LeCount, T. 1970. Distribution of leucyl naphthylamidase and alkaline phosphatase on the villi of the chick duodenum. J. Histochem. Cytochem. 18, 416–423.
- Herbst, J. J., Fortin-Magana, R. & Sunshine, P. 1970. Relationship of pyrimidine biosynthetic enzymes to cellular proliferation in rat intestine during development. Gastroenterology 59, 240–246.
- Holt, J. H. & Miller, D. 1962. The localization of phosphomonoesterase and aminopeptidase in brush borders isolated from intestinal epithelial cells. Biochim. biophys. Acta (Amst.) 58, 239–243.
- Imondi, A. R., Balis, M. E. & Lipkin, M. 1969. Changes in enzyme levels accompanying differentiation of intestinal epithelial cells. Exp. Cell Res. 58, 323–330.
- Klemperer, H. G. & Haynes, G. R. 1968. Thymidine kinase in rat liver during development. Biochem. J. 108, 541–546.
- Lowry, O. H., Rosebrough, N. J., Farr, A. L. & Randall, R. J. 1951. Protein measurement with the Folin phenol reagent. J. biol. Chem. 193, 265–275.
- Nordstrom, C., Dahlqvist, A. & Josefsson, L. 1967. Quantitative determination of enzymes in different parts of the villi and crypts of rat small intestine. Comparison of alkaline phosphatase, disaccharidases and dipeptidases. J. Histochem. Cytochem. 15, 713–721.
- Nordstrom, C., Koldovsky, O. & Dahlqvist, A. 1969. Localization of β-galactosidases and acid phosphatase in the small intestinal wall. Comparison of adult and suckling rat. J. Histochem. Cytochem. 17, 341–347.
- Rey, J., Schmitz, J., Rey, F. & Jos, J. 1971. Cellular differentiation and enzymatic deficits. Lancet ii, 218.
- Rhodes, J. U., Eichholz, A. & Crane, R. K. 1967. Studies on the organization of the brush border in intestinal epithelial cells. Amino-peptidase activity in microvillus membranes of hamster intestinal brush borders. Biochim. biophys. Acta (Amst.) 135, 959–965.
- Uete, T., Tsuchikura, H. & Ninomiya, K. 1970. A fluorimetric method for measuring leucine aminopeptidase activity in red blood cells, serum or tissues. Clin. Chem. 16, 412–415.