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. 2017 Sep 25;5:e3796. doi: 10.7717/peerj.3796

Table 4. Influence of pH on growth and endoglucanase activity of soda solonchak alkaliphiles: average profiles estimated from individual results for eight isolates: actinomycetes-Nocardiopsis DS50, 51; Streptomyces DS8,9; Bacillus: DS85, 100, 101, 102.

pH % of maximum
Actinomycetes Bacillus ACB
Growth Activity Growth Activity
5 0 0
6 20–70 30–70 0
7 40–100 70–100 0–10 0–40
8 80–100 90–100 20–60 40–100
9 90–100 90–100 70–100 90–100
10 80–100 90–100 100 90–100
10.5 40–90 70–100 80–100 100
11 10–40 40–80 30–70 50–90

Notes.

Solid medium 0.6 M total Na+ buffered with: pH 5–8-0.1 M HEPES/NaCl/NaHCO3; pH 8–11-NaHCO3/Na2CO3. Substrate: 0.1% CMC + yeast extract 0.2 g/l. Growth and activity were estimated by the diameter of colony and zone of hydrolysis, respectively, after four days of plate incubation at 30 °C.