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Science 17 July 1981:
Vol. 213. no. 4505, pp. 342 - 344
DOI: 10.1126/science.213.4505.342
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Articles
Blood Function in the Hydrothermal Vent Vestimentiferan Tube Worm
ALISSA J. ARP 1 and
JAMES J. CHILDRESS 1
1 Oceanic Biology Group, Marine Science Institute, University of California, Santa Barbara 93106
Extracellular hemoglobin in the whole blood of Riftia pachyptila has a high oxygen affinity (P50 = 1.8 millimeters of mercury at 3°C), a moderate decrease in oxygen affinity at higher temperatures (P50 = 2.7 millimeters of mercury at 14°C), a small effect of carbon dioxide on oxygen affinity ( log P50/ pH =–0.12), and a high oxygen carrying capacity (up to 11 milliliters of oxygen per 100 milliliters of blood). These characteristics are compatible with the high oxygen demand of chemoautotrophic metabolism in the variable vent environment.
Submitted on May 27, 1980
Revised on December 5, 1981
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