Table 2.
Maximum colony counts (Nmax) and growth rates (V) of F. johnsoniae strain A3 in tap water supplemented with individual amino acids, peptides, and proteins at 10 μg C liter−1
| Amino acid, peptide, or protein | Nmax (×105 CFU ml−1 ± SD) | V (h−1)c |
|---|---|---|
| Amino acids | ||
| Blank Ia | 0.04 (± 0.004) | 0.017 |
| Ala | 0.8 (± 0.01) | 0.029 |
| Asp | NGb | NG |
| Gln | 1.1 (± 0.07) | 0.039 |
| Glu | 1.1 (± 0.05) | 0.038 |
| Gly | NG | NG |
| Ile | 0.5 (± 0.1) | 0.019 |
| Leu | NG | NG |
| Lys | NG | NG |
| Phe | NG | NG |
| Pro | 1.1 (± 0.1) | 0.039 |
| Ser | NG | NG |
| Thr | 0.4 (± 0.2) | 0.016 |
| Tyr | NG | NG |
| Val | NG | NG |
| Peptides and proteins | ||
| Blank IIa | 0.03 (± 0.002) | 0.013 |
| Ala-Ala | 0.6 (± 0.01) | 0.022 |
| Ala-Gln | 1.1 (± 0.2) | 0.046 |
| Gly-Asp | NG | NG |
| Glu-Glu | 1.1 (± 0.01) | 0.081 |
| Gly-Leu-Tyr | NG | NG |
| Poly-Ala | NG | NG |
| Poly-Asp | NG | NG |
| Poly-Glu | NG | NG |
| Casein | 1.3 (± 0.1) | 0.081 |
| Gelatin | 1.2 (± 0.02) | 0.081 |
| Lectin | 1.1 (± 0.06) | 0.034 |
a
Blank I (i.e., tap water in duplicate flasks) was included in the series of individually tested amino acids, and blank II in the series of individually tested peptides and proteins.
b
NG, growth not different from growth in the blank.
c
Standard deviation ≤0.005 h−1 for all V values determined.