Abstract
Flow cytometry was used to observe the transport of fluorescently labelled viable bacteria in the large intestinal lumen of guinea pigs after the injection of the bacteria into the proximal colon. Bacteria were transported along the radial and longitudinal axes of the intestine and were separated from dietary residue, accumulated, and then transported back to the caecum. These observations, together with the heterogeneous distribution of bacterial species and chemical composition across and along the large intestine, suggest that there are several different microenvironments within the intestinal lumen between which bacteria and/or dietary residues move. The existence of different microenvironments within the intestinal lumen is consistent with poor mixing of the digesta within the large intestine of pigs and chickens.
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Takahashi, T., Sakaguchi, E. Transport of bacteria across and along the large intestinal lumen of guinea pigs. J Comp Physiol B 176, 173–178 (2006). https://doi.org/10.1007/s00360-005-0039-6
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DOI: https://doi.org/10.1007/s00360-005-0039-6