TABLE 3.

Viable cell counts determined after washing and after 1 h of incubation at pH 4 either with or without 200 μM uranyl acetatea

GenusStrainCFU (washed)bCFU (without U)cCFU (with U)
ArthrobacterFRC-AA1(1.79 ± 0.48) × 108d(1.59 ± 0.49) × 108(1.45 ± 0.49) × 108
FRC-AA21(1.53 ± 0.37) × 108(7.78 ± 0.20) × 107(6.45 ± 0.38) × 107
FRC-AA252.31 × 1081.39 × 108(9.20 ± 0.49) × 107
FRC-V45(1.67 ± 0.40) × 108(9.13 ± 0.15) × 107(6.85 ± 0.18) × 107
FRC-X341.83 × 1081.71 × 1081.07 × 108
A. histidinolovorans ATCC 11442(1.57 ± 0.13) × 108(6.10 ± 0.49) × 107(4.35 ± 1.04) × 107
BacillusFRC-N652.99 × 108(1.12 ± 0.38) × 108<1 × 104
FRC-X18(1.87 ± 0.50) × 108(3.51 ± 1.14) × 1074.03 × 105
FRC-Y9-2(2.55 ± 0.64) × 107(3.12 ± 1.05) × 106<1 × 104
B. cereus ATCC 14579(9.70 ± 0.52) × 107<1 × 104<1 × 104
EscherichiaE. coli JM109(8.00 ± 0.37) × 107(4.65 ± 0.30) × 107<1 × 104
RahnellaFRC-Y96021.10 × 108(5.40 ± 0.40) × 107(1.54 ± 0.92) × 106
  • a At pH 4 U(VI) occurs primarily as the uranyl ion (UO22+).

  • b All strains were plated immediately following two washes with 0.1 M NaCl at pH 4.

  • c Strains were incubated for 1 h at pH 4.

  • d Standard deviations greater than 10% are shown.