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Table 2 Theoretical calculated rates of flotation of square archaea in saltern brines, based on different values for cell dimensions, the nominal radius [(length × width × height)1/3], the K value (the ratio of the velocity of a sphere with a radius equal to the nominal radius of the particle and the velocity of the particle), as calculated according to algorithms given by McNown and Malaika [39], and the difference in density between the brine and the cells. The "cell" with dimensions 24 × 24 × 0.15 μm represents a sheet of 8 × 8 3 μm-wide cells, such as observed occasionally in brine pools [21].

From: Buoyancy studies in natural communities of square gas-vacuolate archaea in saltern crystallizer ponds

Cell dimensions (μm) Nominal radius (μm) K value 1 – ρ2) (kg m-3) Flotation rate
     (m s-1) (mm day-1)
2 × 2 × 0.2 0.98 1.98 -30 15.8 × 10-9 1.37
2.5 × 2.5 × 0.2 1.08 1.84 -30 20.1 × 10-9 1.80
3 × 3 × 0.15 1.11 2.31 -30 17.4 × 10-9 1.51
24 × 24 × 0.15 4.42 4.61 -30 138 × 10-9 11.9
2 × 2 × 0.2 0.98 1.98 -130 68.7 × 10-9 5.9
2.5 × 2.5 × 0.2 1.08 1.84 -130 89.7 × 10-9 7.8
3 × 3 × 0.15 1.11 2.31 -130 75.5 × 10-9 6.5
24 × 24 × 0.15 4.42 4.61 -130 600 × 10-9 51.8