It is well known that one severely disabling manifestation of ulcerative colitis is diarrhoea, and among the mechanisms suggested to account for it in this condition has been a derangement of absorption across the colonic mucosa. Previous studies utilizing other substances than water have failed to demonstrate deranged absorption from the inflamed rectosigmoid of patients with idiopathic ulcera...

ABST RACT: Tritium accumulation in clay minerals (kaolinite, montmorillonite, palygorskite) was studied experimentally over a one year contact with tritiated water (initial activity 1.67610 Bq/m) under room conditions, and was compared to theoretical calculations. The amounts of tritium ions in bound water and structural hydroxyls were measured by the activity of water fractions released at cha...

The permeability to tritiated water (hourly exchange fraction = 0-164) and the rate of urine flow (0-47% body weight/day) are lower than recorded in other freshwater decapods. The calculated net osmotic water flux (2-71 % body weight/day) is 5 times the water output in the urine, indicating that there is extrarenal excretion of water. Water balance is maintained in the absence of urine producti...

When (14)C-sugar and THO were simultaneously introduced through a cut side vein or flap of a squash leaf (Cucurbita melopepo, Bailey cv. torticollis) concurrent translocation of (14)C-sugars, T-photosynthates and THO with parallel, almost flat, gradients was observed in the petiole for periods of 1 to 3 hr. Parallel translocation gradients were not observed when (14)C was introduced as (14)CO(2...