... carbohydrate probes l -rhamnose and d (+)-cellobiose, which are absorbed exclusively by the paracellular route, and 3- O -methyl- d -glucose (3OMD-glucose), which is absorbed both paracellularly and transcellularly. Using a standard pharmacokinetic technique, we collected blood samples for 2 h after probe...

...%), suggesting problems with the in vivo use of radiolabeled d -glucose. Further trials with 3- O -methyl- d -glucose revealed high bioavailability in wattlebirds (90±5%). This non-metabolisable glucose analogue remains the probe of choice for measuring uptake rates in vivo , especially in birds in which...