Metabolism of Chicken Feathers and Concomitant Electricity Generation by Pseudomonas aeruginosa by Employing Microbial Fuel Cell (MFC)

Table 2

Effect of nitrogen sources on growth, soluble protein, and keratinase activity.

Nitrogen source (0.05% w/v)	Growth (OD 600 nm)^a	Protein (μg/mL)^a	Keratinase activity (U/mL)^a
Control	0.304±0.011	142.7±2.3	7.4±0.4
Casein	0.352±0.014	112.3±3.1	7.5±0.3
Yeast extract	0.326±0.012	160.6±4.4	12.5±0.34^∗
Urea	0.394±0.018	158.9±4.1	12.8±0.4^∗
Ammonium sulfate	0.202±0.014	87.6±4.0	5.3±0.31
Potassium nitrate	0.271±0.014	65.8±2.6	7.5±0.33
Ammonium chloride	0.294±0.016	63.01±2.9	7.1±0.26
NH4H2PO4	0.295±0.0009	112.3±5.8	6.5±0.15
Ammonium nitrate	0.275±0.010	139.9±5.2	6.9±0.31
Sodium nitrite	0.255±0.011	79.4±2.1	5.8±0.21
Sodium nitrate	0.277±0.012	87.6±2.8	6.4±0.24
Skim milk	0.319±0.012	168.2±3.7^∗	9.6±0.34^∗
Tryptone	0.459±0.018	187.3±4.2^∗	13.2±0.36^∗
Beef extract	0.319±0.007	219.2±7.5^∗	13.4±0.27^∗

aValues are mean ± standard deviation of three independent experiments.
*Significantly different from control at 95% confidence level.