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J Appl Physiol 67: 2265-2268, 1989;
8750-7587/89 $5.00
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Journal of Applied Physiology, Vol 67, Issue 6 2265-2268, Copyright © 1989 by American Physiological Society

ARTICLES

Rate of CO uptake by canine erythrocytes as a function of PO2

R. O. Crapo, N. Bitterman, S. L. Berlin and R. E. Forster
Department of Physiology, School of Medicine, University of Pennsylvania, Philadelphia 19104.

We used a continuous-flow rapid-mixing apparatus with spectroscopic analysis to measure the rate of CO uptake by canine erythrocytes at 37 degrees C at five different PO2 values from 0 to 553 Torr. Fresh blood from five different dogs was used for the experiments. PCO approximated 80 Torr. Corrections for the lower capillary PCO during a measurement of the diffusing capacity of lung CO, as made by Roughton and Forster in 1957 (J. Appl. Physiol. 11: 290-302, 1957), were not used. The regression equation for 1/theta, where theta is milliliters of CO combining for each milliliter of whole blood (capacity 0.2 ml/ml) per minute for a PCO of 1 Torr was 1/theta = 1.45 +/- 0.0042 PO2. This equation is very similar to that for human erythrocytes under the same conditions.


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R. E. Forster
Invited Editorial on "Red cell distribution and the recruitment of pulmonary diffusing capacity"
J Appl Physiol, May 1, 1999; 86(5): 1458 - 1459.
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