(PDF) Formations of calcium carbonate minerals by bacteria B thuringiensis, B cereu s, B subtilis and L fusiformis) were selected ba sed on the ure- ase activity, and calcite precipitation However, B megaterium produced highest urease(PDF) Formations of calcium carbonate minerals by bacteria B thuringiensis, B cereu s, B subtilis and L fusiformis) were selected ba sed on the ure- ase activity, and calcite precipitation However, B megaterium produced highest urease