Table 3: Bacterial counts, lactate, and acetate concentrations in rat colonic ring preparations.

Assayed systemConcentrations
1 hour
( , mean ± SD)
24 hours
( , mean ± SD)

Bacterial countsa
Tissue4.0 ± 0.4 × 1055.0 ± 5.0 × 109
Media5.0 ± 0.5 × 1056.0 ± 6.0 × 109
Lactateb20.0 ± 1.03.0 ± 1.0
Acetateb5.0 ± 1.0693 ± 1.5

Washed rat colonic rings were incubated at the times indicated, as described in Methods.
Bacterial counts expressed as counts per gram of tissue or per 10 mL of media.
bLactate or acetate concentrations were determined in the media, as described in Methods, and are expressed in mg/liter of media. The results are the average of three experiments, mean ± SD, with six rats in each experiment.