TABLE 2.
Values for the calculated sedimentation rates. Cell sedimentation velocity (vcell) was calculated for Earth g, Mars g and microgravity (columns I–II). For this latter we used two different values (1×10−2×g and 1×10−6×g). Different units are shown to underline the estimated cell sedimentation rate in the culture chamber over the BioRock experiment (columns III–VI). The distance a cell would travel by random Brownian movements during the time necessary to settle in the culture chamber (column VI) is reported in column VII.
| I | II | III | IV | V | VI | VII |
| Gravity condition | Gravity regime (× g) | vcell (m s–1) | vcell (mm day–1) | Distance in 21 days (cm) | Time to travel 2.3 cm (day) | Distance by Brownian diffusion with t from VI (mm) |
| Earth g | 1 | 5.48 × 10–8 | 4.74 | 9.95 | 4.86 | 0.55 |
| Mars g | 0.4 | 2.05 × 10–8 | 1.77 | 3.72 | 12.98 | 0.90 |
| μg (upper value) | 1 × 10–2 | 5.48 × 10–10 | 4.74 × 10–2 | 9.95 × 10–2 | 4.86 × 102 | 5.49 |
| μg (typical value) | 1 × 10–6 | 5.48 × 10–14 | 4.74 × 10–6 | 9.95 × 10–6 | 4.86 × 106 | 5.49 × 102 |