Table I. Gt of Synechocystis grown under 10 culture conditions.

Gt (hours) was calculated using a regression of the data within the logarithmic growth period at 50 µmol photons m⁻² s⁻¹ (ML) and 200 µmol photons m⁻² s⁻¹ (HL), with or without the addition of CO₂. Values represent means ± sd (n = 3). Means followed by the same letter do not differ by 5% probability (Tukey’s test).

Culture	Gt
	ML	HL
Nitrate	21.41 ± 1.26 fg	20.15 ± 1.63 efg
Ammonium	16.95 ± 0.57 abcd	19.30 ± 0.95 def
Urea	14.88 ± 0.61 abc	13.89 ± 0.20 a
Nitrate + CO2	22.40 ± 0.17 g	17.91 ± 0.37 cde
Ammonium + CO2	17.44 ± 2.26 bcde	14.70 ± 0.44 ab