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Table 5.

Changes in the units of activities per g tissue of glutamine synthetase(GS), carbamoylphosphate synthetase (CPS), ornithine transcarbamoylase (OTC),arginosuccinate synthetase + lyase (ASS+L) and arginase in the liver ofH. signifer after progressive increase in salinity from 0.7‰ to 10‰ or 20‰

		Enzyme activity (μmol min⁻¹ g⁻¹ wet mass)
Enzyme	Substrate and effector	0.7‰ (control)	10‰	20‰
GS	-	4.97±1.32	7.30±1.30	14.7±1.31^{^*},^{^†}
OTC	-	22.8±5.73	35.1±7.72	48.8±2.80^{^*}
ASS+L	-	0.19±0.07	0.44±0.12	0.18±0.04
Arginase	-	29.6±10.2	68.6±12.0	114±9^{^*},^{^†}
CPS	Glutamine	0.04±0.01	0.13±0.05	0.10±0.02
	Glutamine + AGA	0.15±0.04	0.24±0.03	0.35±0.05^{^*}
	Glutamine + AGA + UTP	0.13±0.04	0.21±0.03	0.31±0.04^{^*}

		Enzyme activity (μmol min⁻¹ g⁻¹ wet mass)
Enzyme	Substrate and effector	0.7‰ (control)	10‰	20‰
GS	-	4.97±1.32	7.30±1.30	14.7±1.31^{^*},^{^†}
OTC	-	22.8±5.73	35.1±7.72	48.8±2.80^{^*}
ASS+L	-	0.19±0.07	0.44±0.12	0.18±0.04
Arginase	-	29.6±10.2	68.6±12.0	114±9^{^*},^{^†}
CPS	Glutamine	0.04±0.01	0.13±0.05	0.10±0.02
	Glutamine + AGA	0.15±0.04	0.24±0.03	0.35±0.05^{^*}
	Glutamine + AGA + UTP	0.13±0.04	0.21±0.03	0.31±0.04^{^*}

AGA, N-acetyl-l-glutamate; UTP, uridine triphosphate.

Results represent means ± s.e.m. (N=4).

Significantly different from 0.7‰ control condition at P<0.05.

†

Significantly different from 10‰ at P<0.05.

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