1. Carbamoyl phosphate synthetase, ornithine transcarbamoylase, the arginine-synthetase system and arginase were measured in the livers of ammoniotelic, ureotelic and uricotelic animals. The chelonian reptiles, whose nitrogen excretory patterns vary according to the habitat, and the...

The excretion of delta-aminolevulinic acid and porphobilinogen in the urine of 31 patients with multiple sclerosis did not differ significantly from that of 51 hospitalized control patients or eight patients with poliomyelitis. There was no relationship between exacerbations, remissions or duration...

Experimental evidence bearing on the hepatic uptake and excretion of sulfobromophthalein and bilirubin is considered. From this examination it is postulated that the hepatic handling of each compound consists of three steps: the uptake at the sinusoidal surface of the parenchymal cel...