TABLE 1.

Characterization of NCO⁻ uptake and metabolism in Synechococcus sp. strain UTEX 625

Experimental conditionsa	N14CO− uptake (% of control)	14C fixation (% of control)
Light (control)	100	100
Dark	6.3	2.4
Light + 25 μM DCMU	7.9	2.2
Light + 15 mM glycolaldhyde	59.1	5.6
Light + 15 mM oxalate	88	99.7
Light + 1 mM ethoxyzolamide	39	32.3

^aNCO⁻ uptake and C fixation were measured by the silicone fluid filtering centrifugation technique using method A. Cells grown in standing culture were incubated with 1 mM KO¹⁴CN for 2 min in BTP/HCl buffer, pH 8.0, containing 25 mM NaCl at 30°C and illuminated at 300 μmol m⁻² s⁻¹. Data are the average of 5 experiments in triplicate ±6.5%.