Table 3.

Uptake of Fe2+ by S. mutans GS-5 cells in dense suspensions

Initial Fe2+ concn (mM)Uptake (μmol/g [dry wt] of cells)aR valueb
1.02.4 ± 0.2 (4)2.64
2.55.1 ± 1.3 (2)2.39
5.09.6 ± 1.0 (3)1.42
10.016.5 ± 2.3 (3)0.86
  • a Values are averages ± standard deviations, with the number of trials given in parentheses.

  • b R is the corrected space value.R values greater than 1.0 indicate concentrative uptake, while values less than 1 indicate that only part of the cell volume is penetrated by the solute.