“…It is often assumed that their resistance to abrasion increases with increasing fracture stress and strain (Klein and Eng, 1979;Krouwel, 1982;Leenen et al, 1996;Nussinovitch et al, 1994;Sumino et al, 1992), and with decreasing compression or tension modulus (Muscat et al, 1993;Smidsrød and Christensen, 1991). It is thereby implicitly assumed that, if the biocatalyst particle is mechanically strong, it will be also resistant to abrasion.…”