Selected glucocorticoids have been demonstrated to increase the growth rate of human skin fibroblasts in culture, over a physiologically significant concentration range. At the same concentrations and identical conditions, the glucocorticoid compounds tested inhibited the growth rate of mouse L-929 cells. We have discussed currently acceptable theories of glucocorticoid mechanism of action that permit this dichotomous effect, the main point being that inhibition can no longer be regarded as the only response of fibroblasts to glucocorticoids. Conclusions drawn from observations of cell cultures affected by addition of glucocorticoids must have considered the source of the cells, as response may vary with source and biologic state of the cells in culture.

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Two shear stress calibration methods for the Haake Rotovisko Model RV1 were tested for non‐Newtonian shear‐thinning fluids. Determination of a shear stress calibration constant for each shear rate provided a significant improvement over the manufacturer's calibration method when both methods were compared with corresponding data generated with the Weissenberg Rheogoniometer.

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