Table 4.

Oxygen-binding parameters of whole blood estimated at in vivo pH in fasting and digesting snakes (Python molurus)

ExperimentBefore feeding (0 h)After feeding (48 h)Control (0 h)Control (48 h)
P50 (kPa)4.58±0.11 (9)3.53±0.24 (9)*4.65±0.09 (5)4.68±0.26 (4)
logP500.66±0.01 (9)0.54±0.03 (9)*0.67±0.01 (5)0.67±0.03 (4)
n 2.84±0.18 (9)2.37±0.15 (9)*2.76±0.09 (5)2.44±0.17 (4)
Saturation (%)89.0±1.9 (9)90.3±1.5 (9)83.8±6.4 (5)87.2±1.9 (4)
  • Data for snakes that were not fed but sampled at a 48 h interval are also included (unfed control).

    P50, oxygen tension at half saturation; n, Hills coefficient for cooperativity of oxygen binding. Saturation was calculated on the basis of oxygen-binding properties and in vivo PO2. Values are means ± S.E.M. (N).

  • * signifies statistical difference between 0 h and 48 h values at P≤0.05.