Figure F10. Total prokaryotic cells (solid circles) enumerated by AODC and the percentage of that population involved in cell division (open circles) with depth at Site 1225. Dividing cell percentages become increasingly unreliable as total cell counts decrease below 106/cm3, since the total number of counted cells is then 20-30 and the dividing cells comprise only 5%-10% of this number. The empirical limit for cell counts (~4.7 x 104 cells/cm3) is indicated; natural cell abundances under the detection limits are not quantifiable, and are listed here arbitrarily as 1 x 104 cells/cm3.

Figure F10. Total prokaryotic cells (solid circles) enumerated by AODC and the percentage of that population involved in cell division (open circles) with depth at Site 1225. Dividing cell percentages become increasingly unreliable as total cell counts decrease below 10⁶/cm³, since the total number of counted cells is then 20-30 and the dividing cells comprise only 5%-10% of this number. The empirical limit for cell counts (~4.7 x 10⁴ cells/cm³) is indicated; natural cell abundances under the detection limits are not quantifiable, and are listed here arbitrarily as 1 x 10⁴ cells/cm³.