Table 4 Statistical analysis of the pI bias for different ecological groups.
Ecological group | number | quartile 25% | median | quartile 75% |
|---|---|---|---|---|
oxygen requirements | ||||
anaerobes | 36 | -28.4 | -15.4 | -3.1 |
microaerophiles | 4 | -25.5 | -8.8 | 3.3 |
facultative | 96 | -26.8 | -20.7 | -13.3 |
aerobes | 96 | -29.8 | -12.6 | 9.8 |
temperature requirements | ||||
psychrophiles | 2 | -30.6 | -21.9 | -13.2 |
mesophiles | 202 | -29.6 | -19.0 | -3.3 |
thermophiles | 13 | -27.8 | -20.8 | -13.5 |
hyperthermophiles | 15 | -23.4 | 0.0 | 12.2 |
salinity | ||||
extreme halophiles | 3 | -84.4 | -79.5 | -60.8 |
moderate halophiles | 8 | -49.4 | -48.3 | -44.8 |
mesohalophiles | 41 | -38.7 | -23.4 | -3.4 |
non-halophiles | 180 | -24.8 | -16.3 | -1.3 |
habitat | ||||
aquatic | 25 | -40.4 | -32.7 | -3.4 |
multiple | 56 | -33.8 | -29.4 | -21.0 |
specialized | 22 | -48.2 | -21.2 | -9.9 |
terrestrial | 12 | -26.0 | -22.9 | -20.3 |
host-associated | 117 | -19.8 | -10.6 | 12.8 |
relation to host cell | ||||
free living | 76 | -38.4 | -25.7 | -13.6 |
free living/extracellular | 41 | -33.7 | -26.5 | -20.5 |
free living/intracellular | 4 | -12.9 | -10.6 | -7.8 |
extracellular | 70 | -22.1 | -17.5 | -4.7 |
intracellular | 41 | -8.8 | 14.2 | 42.8 |