Table 1.

Composition and osmotic pressures of the different culture media

	YEL	YEL+NaCl (0.9 M)	YEL+L	YEL+L+NaCl (0.9 M)	MU	MU+NaCl (0.7 M)	SW	SW+NaCl (0.7 M)
Saccharides (lactose) (g L−1)	0	0	34	34	48	48	33.4	33.4
Nitrogen total (g L−1)	14.6	14.6	14.6	14.6	2.3	2.3	0.5	4.2
Non-protein nitrogen (NPN) (g L−1)	14.2	14.2	14.2	14.2	1.5	1.5	0.2	1.6
Lactose/NPN	0	0	2.4	2.4	32	32	167	20.9
Osmotic pressure (osmol)	0.308	2.028	0.406	2.175	0.259	1.996	0.192	1.903

YEL: yeast extract lactate. L: lactose. MU: milk ultrafiltrate. SW: sweet whey