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Influence of culture medium component concentrations on extracellular α-amylase activity. Two-dimensional contour plots showing the interactions between (a) glucose and yeast extract powder, at a proline concentration of 8 g·L−1; (b) glucose and proline at a yeast extract powder concentration of 17.5 g·L−1; (c) yeast extract powder and proline at a glucose concentration of 17.5 g·L−1.
