.... However, respiratory exchange ratio (RER, CO 2 production divided by O 2 consumption) can rise above 1 as a result of de novo lipid synthesis, providing an alternative possible explanation of the prior findings. We studied the relationship between macronutrient ingestion, RER and lipid synthesis using...

.... The permeability of amphibian skin to CO 2 is greater than that to O 2 ; therefore, calculating the ratio of whole-animal CO 2 emission to O 2 uptake (the respiratory exchange ratio, RER) can be used to avoid underestimates of metabolic rate by ensuring that observed values of RER fall within the normal...

... metabolic rate oxygen transport peripheral limitation respiratory exchange ratio selection limit symmorphosis Voluntary behaviors are complex traits that arise from processes in the brain (‘motivation’) but are ultimately limited by an organism's physical and physiological abilities to sense...

... life stages . J. Exp. Biol. 198 , 127 - 135 . carbonic anhydrase CO 2 excretion O 2 uptake respiratory exchange ratio zebrafish Danio rerio Carbonic anhydrase (CA) is the zinc metalloenzyme that catalyzes the reversible reactions of CO 2 , i.e. CO 2 +H 2 O↔H + +HCO 3...

... of covariance showed that S mice had higher body-mass-adjusted V̇ O 2max than C at all P O 2, ranging from +10.7% in hypoxia to +20.8% in hyperoxia. V̇ O 2max of S lines increased practically linearly with P O 2,whereas that of C lines plateaued from normoxia to hyperoxia, and respiratory exchange ratio (=CO 2...

... and increases, respectively, in the respiratory exchange ratio. In eight of the nine species studied, steady-state RE values were not significantly affected by temperature ( P >0.05). However, in T. graeca , mean steady-state RE at 30 °C (0.78±0.08) was significantly higher than mean RE measured after 150 h...

... measurements of inspired minute ventilation , O 2 consumption and CO 2 production were started and continued for 56 h. The decrease in temperature produced a transient fall in the respiratory exchange ratio to 0.2–0.3 and a steady-state value of 0.65±0.14 (mean ± S.D., N =7) was not achieved until about 35 h...

...J. N. Stinner; D. L. Newlon; N. Heisler ABSTRACT Previous studies of reptiles and amphibians have shown that changing the body temperature consistently produces transient changes in the respiratory exchange ratio (RE) and, hence, changes in whole-body CO 2 stores, and that the extracellular fluid...

... cannulae. The ventilation chamber system allowed continuous, almost instantaneous, measurements of water ΔO 2 and ΔCO 2 across the gills, and therefore of respiratory exchange ratio (RE), as well as Δammonia, mean expired pH and ventilation volume . Physiological doses of adrenaline and noradrenaline (3.2...

...Jerry N. Stinner; Robert L. Wardle ABSTRACT The effect of temperature upon respiratory exchange ratio (R) was measured in snakes ( Coluber constrictor ) and turtles ( Chrysemys scripta ). Increasing body temperature produced a transient elevation of R, and lowering body temperature transiently...

... relationships of the results illustrated in A. Animal in air-equilibrated water and breathing air at 25°C. Lung R lines from 0 ·2 to 2·0 are also plotted. Xenopus voluntary diving respiratory exchange ratio O 2 storage O 2 transport. Fig. 6. Corrected data from continuous recordings...