morning feeding, a time point for an expected maximum renal
clearance of acid and bicarbonate resorption. Increases in
distal tubule cellular expression of carbonic anhydrase might
have facilitated the reabsorption of bicarbonate into the
vascular lumen with concomitant increases in transport of H
+ ions into the lumen of the distal tubules for urinary
excretion, an adaptation that may have become most apparent
at our last blood sampling on day 21