Table 3 Correlation between various growth criteria and enzymes activity with different concentration of calcium salts of Bacillus subtilis grown for 5 days at successively increasing levels of calcium salts.

From: Assessment of ecofriendly carbon capture using Bacillus subtilis induced calcium carbonate precipitation with focus on applications mechanisms and cost efficiency

Calcium salts

O.D

Protein

CaCO3 ppt

Ammonia content

Urease activity

Nitrogenase activity

Acetate

0.153

0.418

0.772

0.927*

0.938*

0.161

Citrate

− 0.085

0.037

− 0.052

0.101

− 0.004

0.037

Chloride

0.178

0.685

0.772

0.761

0.788

− 0.261

Nitrate

− 0.224

0.381

0.610

0.451

0.446

0.569

  1. The positive sign (+) indicates positive correlations and the negative sign (−) indicates negative correlations while one star (*) indicates weak correlation value (< 0.7) and two stars (**) indicate strong correlation (≥ 0.7); no star indicates no correlation.
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