TABLE 1.

Influence of nitrogen source on lovastatin production^a

N source	Initial concn (g liter−1)	Residual concn (g liter−1)	Residual glucose concn (g liter−1)	Lovastatin production (mg liter−1)
Di-ammonium tartrate	13.7	—b	0	<1
Ammonium nitrate	4	—	0	<1
Ammonium acetate	11	—	2.5	<1
Sodium nitrate	4	—	0	<1
Urea	4.5	—	0	<1
Sodium glutamate	7	0.1	0	25
Sodium glutamate	12.5	0.4	0	47
Sodium glutamate	18	6.5	0	39
Histidine	12.5	6.0	0	46
Glycine	12.5	0.0	0	17
Arginine	12.5	7.0	0	1.5
Isoleucine	12.5	2.0	0	<1

^aAfter cultivation for 140 h in shake flask in chemically defined medium with glucose (45 g liter⁻¹). 

^b—, not measured.