Table II.
Summary of statistics from regression analyses according to the equation RRLmax = 100(1/exp[(a1{T}0)b1])(1 − 1/exp[(a2{Ca2+}0)b2])
| Toxicant | r2 | n | a1 | a3 | a4 | a7 | b1 | a2 | b2 |
|---|---|---|---|---|---|---|---|---|---|
| Al3+ | 0.944 | 57 | 120 | 2.71 | 10.3 | 0.520 | |||
| H+ | 0.893 | 117 | 7.57 | 0.0863 | 6.23 | 13.7 | 0.379 | ||
| Na+ | 0.842 | 105 | 0.00669 | 0.579 | 6.59 | 12.6 | 0.467 | ||
| Na+ | 0.886 | 105 | 0.0107 | 2.04 | 0.247 | 3.51 | 12.4 | 0.555 |
{T}0 is the activity of the toxicant and {Ca2+}0 is the activity of Ca2+ at the PM surface expressed in millimolar. In some cases a1 = a3/(a4{Ca2+}0 + 1) or a1 = a3/(a4{Ca2+}0 + a7 {Mg2+}0 + 1). All values are significantly different from 0 at the 5% level. Simple correlation coefficients for {Ca2+}0 versus {T}0 were −0.341, −0.330, and −0.428 for Al3+, H+, and Na+, respectively.