Table IV.

The coefficients of several models (multiple linear regression) to explain the activity and “capacity” (KCN-resistant respiration, corrected for residual respiration) with the alternative oxidase concentration, reduction state of the ubiquinone pool before or after addition of KCN, and the total ubiquinone concentration; or with the reduced and oxidized ubiquinone pool instead of the Q_r/Q_t and Q_t e.g. activity model 1 = [AOX] × a1 ⁺ Q_r/Q_t × a2 ⁺ Q_t × a3

Model	Coefficients					Statistics
	AOX (a1)	Qr/Qt (a2)	Qt (a3)	Qr (a4)	Qox (a5)	r2	p
Activity 1	0.003	−0.039	0.372	–	–	0.91	n.s.a
Activity 2	–	−0.027	0.328+	–	–	0.90	*
Activity 3	−0.001	–	–	−0.287	0.493	0.90	n.s.
Activity 4	–	–	–	−0.369	0.528	0.90	*
Capacity 1	0.001	0.023	0.079	–	–	0.97	**
Capacity 2	–	0.024	0.072	–	–	0.97	**
Capacity 3	−0.009	–	–	1.325*	−1.061+	1.00	**
Capacity 4	–	–	–	0.807*	−0.488	0.99	**

Capacity model 1 = [AOX] × a1 ⁺ Q_r × a4 ⁺ Q_ox × a5. The a1 through a5 coefficients correspond to the respective coefficients listed in the table. Note that some models do not contain the AOX concentration and all models go through the origin. The fit of the linear model is represented by the r² and the p value shows the significance of the model; the significance of the individual coefficients is also shown; ⁺, p < 0.1; ^*, p < 0.05; and ^**, p < 0.01.

^a n.s., Not significant.