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Respiratory Quotient of Panagrellus Redivivus

Respiratory Quotient of Panagrellus Redivivus RESPIRATORY QUOTIENT OF PANAGRELLUS REDIVIVUS BY C. S. HAMMEN University of Rhode Island, Kingston, Rhode Island, U.S.A. With a new type of Warburg flask the Respiratory Quotient of Panagrellus redivivus was deter- mined as 0.734 ± 0.028. Carbon dioxide fixation was equivalent to 2.3% of oxygen consumption. This does not raise the "corrected" value enough to make it representative of the R.Q. expected on complete oxidation of the food materials of yeast. The glyoxylate cycle may help to account for the deficiency in CO2 production. Calculations based on data in the literature suggest that free- living worms carry on CO2 fixation at a relative rate of 2% of O2 consumption, tapeworms at 11 %, and animal-parasitic nematodes at 21 to 24%. Unusually low respiratory quotients were reported by Santmyer (1956) for Panagrellu.r redivivu.r, 0.63 fresh and 0.40 starved. The O2 consumption in his experiments, performed with a differential microrespirometer, was 228 pmoles/ g-hr. at 25°. In the Cartesian diver experiment of Rohde ( 1960) the rate was 286 ,umoles/ g-hr. Rohde also observed that two species of plant-parasitic nema- todes, Hoplolaimu.r tylenchi f ormi.r and Pratylenchu.r penetran.r, respired at lower rates when carbon dioxide was either completely removed http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Respiratory Quotient of Panagrellus Redivivus

Hammen, C.S.
Nematologica , Volume 13 (4): 6 – Jan 1, 1967
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529267X00427
Publisher site
See Article on Publisher Site

Abstract

RESPIRATORY QUOTIENT OF PANAGRELLUS REDIVIVUS BY C. S. HAMMEN University of Rhode Island, Kingston, Rhode Island, U.S.A. With a new type of Warburg flask the Respiratory Quotient of Panagrellus redivivus was deter- mined as 0.734 ± 0.028. Carbon dioxide fixation was equivalent to 2.3% of oxygen consumption. This does not raise the "corrected" value enough to make it representative of the R.Q. expected on complete oxidation of the food materials of yeast. The glyoxylate cycle may help to account for the deficiency in CO2 production. Calculations based on data in the literature suggest that free- living worms carry on CO2 fixation at a relative rate of 2% of O2 consumption, tapeworms at 11 %, and animal-parasitic nematodes at 21 to 24%. Unusually low respiratory quotients were reported by Santmyer (1956) for Panagrellu.r redivivu.r, 0.63 fresh and 0.40 starved. The O2 consumption in his experiments, performed with a differential microrespirometer, was 228 pmoles/ g-hr. at 25°. In the Cartesian diver experiment of Rohde ( 1960) the rate was 286 ,umoles/ g-hr. Rohde also observed that two species of plant-parasitic nema- todes, Hoplolaimu.r tylenchi f ormi.r and Pratylenchu.r penetran.r, respired at lower rates when carbon dioxide was either completely removed

Journal

Nematologica – Brill

Published: Jan 1, 1967

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