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Fig. 4. The fractional absorptions of three carbohydrate probes in Egyptian fruit
bats, Rousettus aegyptiacus (circles, N=11) and
Sprague-Dawley laboratory rats [squares, N=6; rat data from Lavin et
al. (Lavin et al., 2004)].
3-OMD-glucose (194 Da; closed symbols) is absorbed both actively
and passively; L-rhamnose (164 Da) and cellobiose (342 Da) are
absorbed passively (open symbols). For rats, lactulose (342 Da), an isomer of
cellobiose, was used as a probe instead, and was assumed to behave similarly
to cellobiose. Asterisks indicate statistically significant differences
(P<0.05) between rats and R. aegyptiacus (see main text);
error bars are ±1 s.e.m. (some error bars are smaller than the
symbols). Both species show high absorption of 3-OMD-glucose, and
both show decreasing absorption of the passively absorbed probes as probe size
increases; however, passive absorption by R. aegyptiacus was
significantly higher than that by rats for both passively absorbed probes.
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