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Fig. 5. (A) Cumulative absorption versus time since ingestion of
3-O-methyl-D-glucose (3OMD-glucose; open
circles, solid line), cellobiose (open triangle, broken line) and
L-rhamnose (open square, dotted line) by Egyptian fruit bats. (B)
The ratios of apparent absorption of L-rhamnose and
3OMD-glucose were calculated from the cumulative amounts absorbed
in Fig. 5A. Assuming that absorption of L-rhamnose is passive,
whereas the absorption of 3OMD-glucose represents the sum of
passive plus mediated absorption, the ratio of the apparent absorption
(L-rhamnose/3OMD-glucose) indicates the proportion of
3OMD-glucose absorption that occurs via the passive
pathway. These data suggest that at least 60% of 3OMD-glucose
absorption was passive, whatever time point one chooses to use in calculating
apparent absorption rate (i.e. from zero to 5 min or zero to 2 h).
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