TABLE 1.

Growth characteristics of S. herbicidovorans MH grown on (R)-dichlorprop, (S)-dichlorprop, (RS)-dichlorprop, and 2,4-D and of the strain grown on (R)-mecoprop, (S)-mecoprop, and (RS)-mecoprop^a

Growth substrate	Mean growth rate (h−1) ± SD	Specific deg- radation rate (mmol h−1 g [dry wt]−1)	Mean yield (g [dry wt] g of substrate−1) ± SD
(R)-Dichlorprop	0.082 ± 0.006	2.3	0.37 ± 0.06
(R)-Mecoprop	0.032	NDb	0.30 ± 0.15
(S)-Dichlorprop	0.036 ± 0.001	1.4	0.35 ± 0.02
(S)-Mecoprop	0.039	ND	0.35 ± 0.05
Racemic mixture of dichlorprop			0.29 ± 0.03
(R)-Dichlorprop	0.043 ± 0.003	2.4
(S)-Dichlorprop	0.029 ± 0.004	1.1
Racemic mixture of mecoprop	0.016c	ND	0.30 ± 0.04
2,4-D	0.133 ± 0.003	4.4	0.19 ± 0.05

^aValues for growth on mecoprop were taken from reference 24. 

^bND, not determined. 

^cIn this case, the growth rate was affected by the concentration, which for each enantiomer was only half of what it was in the experiments with the pure mecoprop enantiomers. Additional growth experiments showed increased growth rates in experiments with higher (RS)-mecoprop concentrations (24).