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Mechanical aspects of rabbit fecal dehydration

McKie, A.T., Naftalin, R.J. and Powrie, W. (1990) Mechanical aspects of rabbit fecal dehydration American Journal of Physiology. Gastrointestinal and Liver Physiology, 258, G391-394.

Record type: Article


The hydrostatic pressure required to reduce the water content of rabbit feces in an odometer from greater than 80 to less than 65% was approximately 5 atm. This pressure was unaffected by raising the temperature from 20 to 37 degrees C. It became progressively more difficult to dehydrate feces as consolidation occurred, as is evident from the significant (P less than 0.001) reduction in the fecal consolidation coefficient (Co) from 1.76 +/- 0.25 X 10(-6) (n = 4) to 1.35 +/- 0.093 X 10(-7) m2/s (n = 4) and the fecal fluid permeability coefficient (k) from 4.10 +/- 0.51 X 10(-8) (n = 4) to 1.42 +/- 0.12 X 10(-10) m/s (n = 4), concomitant with the reduction in fecal water content. The results suggest that rabbit hard feces are unlikely to be produced, under physiological conditions, by mechanical pressure exerted by the wall of the colon or by a prolonged retention time of hard feces by the distal colon. The hypertonic absorbate (1,000 mosmol/kg) produced by rabbit descending colon is of sufficient magnitude to overcome the fecal resistance to dehydration.

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Published date: 1990
Additional Information: McKie A T, Naftalin R J, Powrie W., (1990). "Mechanical aspects of rabbit fecal dehydration." American Journal of Physiology (gastrointest. Liver Physiol.), 258, G391-394


Local EPrints ID: 75691
ISSN: 0193-1857
PURE UUID: be28ac36-b1b3-4162-95dc-c4f2e14c8048
ORCID for W. Powrie: ORCID iD

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:42

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Author: A.T. McKie
Author: R.J. Naftalin
Author: W. Powrie ORCID iD

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