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External, internal, and total carbonic anhydrase (CA) activities in Amphora coffeaeformis, Amphora acutiuscula, Entomoneis paludosa, and Nitzschia palea grown in ASW (control) or in the presence of 20 μM Zn added to ASW. Mean values ± SE (n = 3–5). Significant differences are indicated by an asterisk (P ≤ 0.05).
