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By T.K. Ghose ,A. Fiechter, N.Blakebrough

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31, illustrate the profound effect of xanthan solution rheological properties even at relatively low concentrations. Furthermore, although the data are by no means extensive enough to permit development of a general correlation, they do seem to demonstrate that there are qualitative as well as quantitative differences between the gas absorption characteristics of mycelial culture fluids and those containing a soluble polymer. These differences are probably a result of the different phenomena which cause each type of fluid to exhibit its own non-Newtonian characteristics.

Nature of rheological behavior not discussed. 17 Brookfield No 1. Viscosity increases monotonically with reaction time. 2. Nature of rheological behavior not given. not given Brookfield No 1. Medium contains dextran. 2. Viscosity measurement provides excellent measure of dextranase production. 3. Nature of rheological behavior not discussed. 0 Brookfield No 1. Viscosity increases monotonically with reaction time. 2. Nature of rheological properties not discussed. 0 1 RPM (~ not given) No. Brookfield; Brookfield-Wells cone and plate 1561 (whole broth and filtered broth) X.

That there is some question regarding the validity of in situ viscosity measurements made by these authors. One must also recognize that the definition of mixing time is somewhat arbitrary and its evaluation is partially subjective. Also, it is possible that the Norwood-Metzner correlation is not valid here (assuming the experimental conditions were as specified by Norwood and Metzner). Finally, the reader is cautioned about what appears to be a typographical error in Wang and Fewkes' [99] equation for the Norwood-Metzner mixing number.

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