Photoproduction of Hydrogen under Different Cultural Conditions by Alginate Immobilized Rhodopsedomonas palustris KU003

Table 4

Effect of nitrogen source on hydrogen production (mL/15 mL vessel) by immobilized cells of Rps. palustris in anaerobic dark.

Nitrogen source			Incubation period (in hrs)
	24	48	72	96	120	144	166	192
Potassium nitrate	—	—	0.32 ± 0.02	0.56 ± 0.04	1.10 ± 0.18	0.78 ± 0.10	0.56 ± 0.08	0.38 ± 0.16
Sodium nitrate	—	—	0.28 ± 0.04	0.44 ± 0.08	0.78 ± 0.12	0.36 ± 0.10	0.24 ± 0.16	—
Ammonium chloride	—	—	—	—	—	—	—	—
Urea	—	—	0.20 ± 0.02	0.42 ± 0.08	0.62 ± 0.10	0.38 ± 0.08	—	—
Thiourea	—	—	—	—	0.34 ± 0.14	—	—	—
Glycine	—	—	0.28 ± 0.06	0.52 ± 0.08	0.98 ± 0.02	0.64 ± 0.06	0.38 ± 0.18	0.24 ± 0.16
L-asparagine	—	0.34 ± 0.04	0.56 ± 0.02	0.86 ± 0.18	1.24 ± 0.16	0.78 ± 0.20	0.42 ± 0.14	0.24 ± 0.18
L-aspartic acid	—	0.48 ± 0.14	0.68 ± 0.22	0.94 ± 0.16	1.44 ± 0.22	0.76 ± 0.10	0.44 ± 0.16	—
L-glutamic acid	—	—	0.26 ± 0.16	0.48 ± 0.14	1.94 ± 0.28	1.24 ± 0.10	0.94 ± 0.14	0.56 ± 0.18
L-glutamine	—	0.36 ± 0.03	0.54 ± 0.16	0.78 ± 0.14	1.34 ± 0.38	0.62 ± 0.16	0.34 ± 0.18	—
L-tyrosine	—	—	0.28 ± 0.08	0.48 ± 0.08	0.86 ± 0.24	0.54 ± 0.08	0.22 ± 0.14	—
L-cystine	—	—	0.22 ± 0.12	0.48 ± 0.18	0.78 ± 0.14	0.52 ± 0.18	0.26 ± 0.16	—
L-methionine	—	0.20 ± 0.06	0.46 ± 0.12	0.76 ± 0.18	1.18 ± 0.12	0.84 ± 0.16	0.58 ± 0.28	0.26 ± 0.16
Nitrogen gas	—	—	—	0.38 ± 0.08	0.58 ± 0.06	0.24 ± 0.22	—	—

—No hydrogen.