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Table 4 Statistical analysis of the pI bias for different ecological groups.

From: The relationships between the isoelectric point and: length of proteins, taxonomy and ecology of organisms

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