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Biol Bull 121: 535-546. (December 1961)
© 1961 Marine Biological Laboratory
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UREASE ACTIVITY IN TRYPANORHYNCH CESTODES

JOHN E. SIMMONS JR. 1

1 Marine Biological Laboratory, Woods Hole, Massachusetts, and Department of Biology, Rice University, Houston, Texas

1. Strong urease activity was measured in tissue preparations of two species of trypanorhynch cestodes; activity was not detected in seven species of tetraphyllids, nor in a third trypanorhynch.

2. Tissue activity of Lacistorhynchus tenuis homogenates was in excess of 3000 micromoles urea hydrolyzed per gram wet tissue per hour; that of Pterobothrium lintoni was about ten times greater. Tissue activity of intact Lacistorhynchus was about one-tenth that of homogenate preparations.

3. The worm activity was partially characterized in homogenate preparations.

4. Living worms retain full activity for at least 110 hours, but homogenates rapidly decline in activity; less than 10% of the original activity is measured after 24 hours.

5. Production of ammonia and of 14CO2 from [14C] urea was demonstrated using intact Lacistorhynchus.






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