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Host-Parasite Relationships in Echinococcosis
III. Relation of Environmental Oxygen Tension to the Metabolism of Hydatid Scolices
Ishak Farhan
Ishak Farhan
Departments of Chemistry and Tropical Health, American University of Beirut, Beirut, Lebanon
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Calvin W. Schwabe
Calvin W. Schwabe
Departments of Chemistry and Tropical Health, American University of Beirut, Beirut, Lebanon
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C. Richard Zobel
C. Richard Zobel
Departments of Chemistry and Tropical Health, American University of Beirut, Beirut, Lebanon
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Summary
The polarographic method for oxygen was applied to the problem of aerobiasis-anaerobiasis in echinococcosis to show that:
- 1. The dissolved oxygen content of fluids of 3 hydatid cysts of the bovine lung ranged from 2.80 to 3.12 mm3 per ml, of 7 hydatid cysts of the bovine liver from 1.28 to 2.28 mm3 per ml.
- 2. The QO2 of hydatid scolices decreased with environmental oxygen tension until at a tension of 0.80 ± 0.48 mm3 per ml the rate became and remained zero.
- 3. The polarographic QO2 at an oxygen tension representing hydatid cyst fluid saturated with air (“optimum rate”) ranged from 0.39 to 1.50 (0.85 ± 0.39).
- 4. The QO2 at the in vivo oxygen tension of lung cysts was 96 per cent and of liver cysts 54 per cent of the mean “optimum rate.” It would appear therefore that hydatid scolices are able to carry on predominantly aerobic metabolism in vivo.
- 5. Hydatid scolices possibly repay an accumulated oxygen debt following anaerobic incubation.
Author Notes
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