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The effect of absorbing resins on the yeast reduction of cl,P-unsatura
ted carbonyl compounds is reported. Enantioselectivity, chemoselectivi
ty and space-time yields of the biotransformation are impressively enh
anced. The distribution of substrates and products between the resin a
nd the water phase shows that the improved selectivity has to be attri
buted to the control of substrate concentration, (C) 1998 Elsevier Sci
ence Ltd. All rights reserved.