TABLE 6.
Abilities of a single efflux pump, two efflux pumps in parallel, and two efflux pumps in series to decrease the cytoplasmic concentration of a solute below its external concentration under conditions of dynamic balance when the rates of inward permeation and efflux become equal
| Pump efficiency (η) |
c3/c1 for: |
||
|---|---|---|---|
| A single pumpa | Two pumps in parallelb | Two pumps in seriesc | |
| 1 | 0.500 | 0.333 | 0.250 |
| 2 | 0.333 | 0.200 | 0.111 |
| 3 | 0.250 | 0.143 | 0.062 |
| 5 | 0.167 | 0.091 | 0.028 |
| 10 | 0.091 | 0.048 | 0.008 |
a
Where c3/c1 = 1/(1 + η), which is equivalent to equations 25 and 27.
b
Where c3/c1 = 1/(1 + 2η), which is equivalent to equations 29 and 30.
c
Where c3/c1 = 1/(1 + 2η + η2), which is equivalent to equation 31.