Advances in Human Genetics by Gebhard Flatz (auth.), Harry Harris, Kurt Hirschhorn (eds.)

By Gebhard Flatz (auth.), Harry Harris, Kurt Hirschhorn (eds.)

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1984). Chapter 1: Genetics of Lactose Digestion in Humans 27 8. , 1984). In field work, breath collection should not be limited to one sample after lactose ingestion, because of the variable timing of maximal hydrogen excretion. As shown in Fig. , 1984). , 1981). FORMAL GENETICS OF THE LACTASE PHENOTYPES Before 1973, agenetic origin of adult "lactase deficiency" or primary "lactose malabsorption" was mentioned in many reports, but sufficient evidence in support of the genetic hypothesis was not available.

And animals having received three thyroxine injections on days 8, 9, and 10. The last bar represents lactase activity in untreated adult rats. Results shown are lactase activities in units/mg protein ; results were similar with protein concentration as a reference. 01). From Paul and Flatz (1983). of lactase activity in suckling rats. Administration of glucocorticoids and thyroxine accelerates the reduction in lactase activity. The effect of thyroxine was compared to the metamorphosis of the axolotl, which is known to be triggered by thyroid hormone .

Velocity of Gastric Emptying. This depends partly on the preexisting tonicity of gastric musculature, which follows a circadian rhythm (Heading, 1982). In addition, consistency, temperature, osmolarity, and pH of food are determinants of stomach passage time (Welsh and Hall, 1977). Isotonic test meals pass more rapidly than solutions with high or low osmolarity. Some subjects with low LDC report that they can induce diarrhea by drinking ice cold milk, whereas the same amount of warm milk will produce no or only slight symptoms.

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