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where k is a constant based on the mat composition, S is the specific surface area of the solids per unit volume, E is the mat porosity, and V is the volume fraction of the web occupied by solids. Information on drainage is found in Rance (1980). Drainage can be increased by other factors as well. An increased stock temperature gives a reduced water viscosity and has a similar effect as in ...
Polyacrylamide gels have served as an important tool to investigate the effect of substrate stiffness on cellular functions in various cell types since Pelham et al. reported that cell motility and focal adhesion in fibroblasts are regulated by the stiffness of collagen-coated polyacrylamide gels. 62 One of the advantages of polyacrylamide gels is that they are biologically inert.
