Table 1. Some Key Properties of Cell Membranes.
| membrane thickness (nm) | Ema (mV) | pHb | redox potentiald | cholesterol:phospholipid ratio | |
|---|---|---|---|---|---|
| mitochondria outer | 2.13 (253)e | 0 | 7.2 | 0.06 (254) | |
| mitochondria inner | 140 | 8.5 | − (255) | 0.12 (254) | |
| ER | 3.75 (256) | ∼0 (88−90) | 7.2 (257) | ++ (258) | 0.065−0.237 (254) |
| Golgi | 3.95 (256) | ∼0 (91) | 6.0−6.7 (257) | 0.25 (259) | |
| secretory vesicles | 3.83 (253)e | −76 (92) | 5.2 (257) | ||
| PM | 3.56 (256) (basolateral), 4.25 (256) (apical) | −60 | 7.4c | ++ (260) | 0.42 (259), 0.46−0.76 (254) |
| early endosomes | 6.3−6.5 257,261 | + (262) | 0.80 (259) | ||
| late endosomes | 5−6 257,261 | + (262) | 0.69 (259) | ||
| lysosomes | 3.83 (253)e | 72 (263) | 4.5−5.5 257,261 | + (262) | 0.38 (264) |
| phagosome | 3.83 (253)e | −27 (265) | 8 | ||
| cytosol | − | − | 7.2 | − (266) | − |