Table 3.

Maximum cellular accumulations of [14C]GBT from supplied [14C]choline in estuarine bacteria grown in filtrate cultures subjected to salinity variationsa

Salinity (ppt)Cellular [14C]GBT concn
10−18 mol · cell−1mM inside cellsb
70.22.1
14c 0.68.2
251.419
352.434
  • a [14C]choline was supplied at an initial concentration of 11 nM.

  • b A biovolume of 0.07 μm per cell was assumed. Bacteria were counted by the DAPI staining method.

  • c The natural salinity of the water samples.