Ann Soc Belges Med Trop Parasitol Mycol
August 1971
Ann Soc Belges Med Trop Parasitol Mycol
January 1970
Ann Soc Belges Med Trop Parasitol Mycol
October 1971
The level of activity of the ornithine-urea cycle is low in the liver of the permanently aquatic Australian lungfish. The rate of incorporation of (14)C-bicarbonate into urea by liver slices was only 100th of that previously observed in the estivating African lungfish Protopterus dolloi. The activities of enzymes of the ornithine-urea cycle were similarly reduced.
View Article and Find Full Text PDFAnn Soc Belges Med Trop Parasitol Mycol
February 1968
Ann Soc Belges Med Trop Parasitol Mycol
October 1968
Bull Soc Pathol Exot Filiales
February 1968
The presence of all five enzymes of the ornithine-urea cycle has been demonstrated in the liver of the African lungfish Protopterus aethiopicus. Levels of activity of the rate-limiting enzymes, carbamoyl phosphate synthetase and argininosuccinate synthetase, are similar to those in the premetamorphic tadpole of Rana catesbeiana and considerably lower than the levels reported for other ureotelic animals. They are thus consistent with the predominantly ammonotelic metabolism of the lungfish in an aquatic environment.
View Article and Find Full Text PDF