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EC Number	pH Minimum	pH Maximum	Commentary	Reference
1.16.1.7	-999	-	high pH sensitivity of enzyme, highest activity at apoplastic pH of 4.9, no activity above apoplastic pH of 5.3. Nitrate increases pH value, thus inhibiting enzyme activity, ammonium decreases pH value. Nitrate together with hydrogen carbonate, a combination typical for calcareous soils, has strongest enzyme depressing effect	660081
1.16.1.7	5.5	8	pH 5.5: about 35% of maximal activity, pH 8.0: about 50% of maximal activity	438034

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Release 2023.1 (January 2023)