Table 1.

Steady-state levels of glycosyl hydrolases

Carbon source(s)Glycosyl hydrolase activity (mean ± SD)
α-Glucosidase (μmol of PNP/min/mg)β-Glycosidase (μmol of PNP/min/mg)α-Amylase (U/ml)
Sucrose46 ± 2607 ± 55121 ± 20
Sucrose + yeast extract13 ± 132 ± 2<10
Sucrose + tryptone35 ± 573 ± 537 ± 20
Sucrose + amino acidsa 10 ± 3126 ± 755 ± 30
Tryptone33 ± 2151 ± 641 ± 4
  • a The amino acids included alanine, arginine, asparagine, aspartate, glutamate, glutamine, glycine, leucine, and histidine.