1.1.99.6 6.5 - and below for malate as substrate 1.1.99.6 7 - - 1.1.99.6 7.5 - - 1.1.99.6 8 - in a 25 mM Tris buffer at 60°C 1.1.99.6 8.1 - - 1.1.99.6 8.5 - 60°C 1.1.99.6 8.6 - D-lactate as substrate 1.1.99.6 9 - -