= Respirometry
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<Respirometry> measures <gas exchange> associated with <metabolism>, commonly <oxygen> consumption or carbon-dioxide production. In a closed chamber, the change in gas amount over time can estimate a rate after correcting for chamber <volume>, background and <temperature>. Flow systems instead compare incoming and outgoing gas. A measured <oxygen> flux reports aggregate oxidative activity under the stated conditions; it does not uniquely identify which fuel or individual reaction produced it. <Respiratory enzymes in oxidative phosphorylation. I. Kinetics of oxygen utilization by Britton Chance and G. R. Williams>[1955, recording oxygen utilization and respiratory states]{ref}
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