Table 1 Composition of non-supplemented DW medium

Sugars (88% lactose, 12% galactose)

78 g/L

Total N content (Kjeldahl analysis)

403 mg/L

Ammonium-N

106 mg/L

Urea-N

43 mg/L

Nitrate-N

4 mg/L

Nitrite-N

<1 mg/L

Organic nitrogen (except urea-N)

250 mg/L

Protein^a

1,560 mg/L

Sulfate-S

78 mg/L

Phosphate-P

410 mg/L

Potassium

2,600 mg/L

pH value

5.7 to 6.0