By Olaus Johan Murie

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E. those in which fluid enters and leaves the reactor by plug-flow and is uncontaminated), C curves can be easily transformed into E curves by dividing each concentration by the area under the C curve. e. if outflow is turbulent or is contaminated), outflow samples may not be representative and hence concentration values cannot be transformed into the fraction of total marker defecated. In animals, such as birds and reptiles, where urine and faecal materials are mixed in the cloaca, for example, the concentration curve cannot be directly transformed into a frequency distribution of retention times.

The F curve increases in a decelerating fashion and tends asymptotically to the concentration of marker in the input fluid (Fig. 5c). When many CSTRs are placed in series, the 38 C. Martinez del Rio, S. J. Cork, W. H. Karasov Plug flow c o (a) Mixed flow Output Input I2 (0 Input Output c 0) o c o o c o c o o 0) I CD 0 (b) •a (d> A A c 03 o c o o c o 0 • Time • Time Fig. 5. Ideal CSTR and PFR reactors have characteristic ouput distribution of markers, (a) PFRs show step function outputs if the marker is introduced as a step signal.

A. (1990). Comparative aspects of plant cell wall digestion in mammals. In The Rumen Ecosystem, ed. S. Hoshino, R. Onodera, H. Minato & H. Itabashi, pp. 109-120. Tokyo: Japan Scientific Societies Press. Probst, E. (1986). Deutschland in der Urzeit. Von den Entstehung des Lebens bis zum Ende der Eiszeit. Miinchen: Bertelsmann. Romer, A. S. (1966). Vertebrate paleontology, 3rd edn. Chicago: University of Chicago Press. Savage, D. E. & Russell, D. E. (1983). Mammalian Paleofaunas of the World. Reading, MA: Addison-Wesley.

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