REFERENCES
- Alpers, D. H. 1969. Separation and isolation of rat and human intestinal β-galactosidases. J. biol. Chan. 244, 1238–1246.
- Asp, N. G. 1971. Human small-intestinal β-galactosidases. Separation and characterization of three forms of an acid β-galactosidase. Biochem. J. 121, 299–308.
- Asp, N. G. & Dahlqvist, A. 1971. Assay of 2-naphthyl β-galactosidase activity. Analyt. Biochem. 42, 275–280.
- Asp, N. G. & Dahlqvist, A. 1971. Human small-intestinal β-galactosidases. Specific assay of three different enzymes. Analyl. Biochem. Submitted for publication.
- Asp, N. G., Dahlqvist, A., Gudmand-Höyer, E. & Jarnum, S. 1971. Disaccharidase deficiencies in Greenland Eskimos. In preparation.
- Asp, N. G., Dahlqvist, A. & Koldovský, O. 1969. Human small-intestinal β-galactosidases. Separation and characterization of one lactase and one hetero β-galactosidase. Biochem. J. 114, 351–359.
- Auricchio, A., Rubino, A., Prader, A., Rey, J., Jos, J., Frézal, J. & Davidson, M. 1965. Intestinal glycosidase activities in congenital malabsorption of disaccharides. J. Pediat. 66, 555–564.
- Cook, G. C., Asp, N. G. & Dahlqvist, A. 1971. Activity of brush border lactase, acid β-galactosidase and hetero β-galactosidase in the small intestine of lactose intolerant Zambian Africans. Gastroenterology. Submitted for publication.
- Dahlqvist, A. 1968. Assay of intestinal disaccharides. Analyt. Biochem. 22, 99–107.
- Dahlqvist, A. & Asp, N. G. 1971. Accurate assay of low intestinal lactase activity with a fluorometric method. Analyt. Biochem. In press.
- Dawson, A. M. 1968. Carbohydrate absorption, pp. 186–205 in The Scientific Basis of Medicine Annual Reviews 1968.
- Dunphy, J. W., Littman, A., Hammond, J. B., Forstner, G., Dahlqvist, A. & Crane, R. K. 1965. Intestinal lactase deficit in adults. Gastroenterology 49, 12–21.
- Eggstein, M. & Kreutz, F. H. 1955. Vergleichende Untersuchungen zur quantitativen Eiweissbestimmung im Liquor und Eiweissarmen Lösungen. Klin. Wschr. 33, 879–884.
- Gray, G. M. & Santiago, N. A. 1969. Intestinal β-galactosidase. I. Separation and characterization of three enzymes in normal human intestine. J. clin. Invest. 48, 716–728.
- Gray, G. M., Santiago, N. A., Colver, E. H. & Genel, M. 1969. Intestinal β-galactosidases. II. Biochemical alteration in human lactase deficiency. J. clin. Invest. 48, 729–735.
- Holzel, A., Schwarz, V. & Sutcliffe, K. W. 1959. Defective lactose absorption causing malnutrition in infancy. Lancet 1, 1126–1128.
- Hultberg, B. & Öckerman, P. A. 1970. β-Glucosidase activities in human tissues. Findings in Gaucher's disease. Clin. chim. Acta 28, 169–174.
- Hultberg, B., öckerman, P. A. & Dahlqvist, A. 1970. Gargoylism. Hydrolysis of β-galactosides and tissue accumulation of galactose- and man-nose-containing compounds. J. clin. Invest. 49, 216–224.
- Jussila, J., Isokoski, M. & Launiala, K. 1970. Prevalence of lactose malabsorption in a Finnish rural population. Scand. J. Gastroent. 5, 49–56.
- Launiala, K., Kuitunen, P. & Visakorpi, J. K. 1966. Disaccharidases and histology of duodenal mucosa in congenital lactose malabsorption. Acta paediat. scand. 55, 257–263.
- Lifshitz, F. 1966. Congenital lactase deficiency. J. Pediat. 69, 229–237.
- Lineweaver, H. & Burk, D. 1934. The determination of enzyme dissociation constants. J. Amer. Chem. Soc. 56, 658–666.
- 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.
- Potter, V. R. & Elvehjem, C. A. 1936. A modified method for the study of tissue oxidations. J. biol. Chem. 114, 495–504.
- Sebus, J., Coene, E. R. & Bult, J. A. 1964. An improved Crosby capsule. Lancet 1, 918.
- Simoons, F. J. 1970. Primary adult lactose intolerance and the milking habit: A problem of biologic and cultural interrelations. II. A culture historical hypothesis. Amer. J. dig. Dis. 15, 695–710.