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Table 2 Bacterial cell recovery from sandstone and limestone blocks treated with silicon (S) and acrylic (AC) polymers impregnated with copper nanoparticles

From: Antimicrobial potential of consolidation polymers loaded with biological copper nanoparticles

Bacterial strains Bacterial cell number (x104 CFU/ml)
  Control Limestone blocks Sandstone blocks
   S/CuNPs AC/CuNPs S/CuNPs AC/CuNPs
Escherichia coli 75.8 ± 0.9 5.2 ± 0.3** 9.9 ± 0.4** 7.5 ± 0.6* 8.3 ± 0.3**
Streptomyces parvulus 95.3 ± 0.7 6.3 ± 0.5* 4.5 ± 0.2** 4.6 ± 0.4** 7.6 ± 0.6**
Bacillus subtilis 84.7 ± 0.6 5.8 ± 0.6** 4.2 ± 0.3** 3.9 ± 0.3** 4.4 ± 0.1**
  1. Statistical significance of differences compared to untreated stone samples: *, significant at P < 0.05; **, significant at P < 0.01