The Company of Biologists

Table 1.

Activities of selected enzymes of nitrogen metabolism in rectal gland of dogfish shark, starved and post-feeding

Time post feeding (h)	Enzyme activity (μmol min⁻¹ g⁻¹)
Time post feeding (h)		N	AAT	DAT	GDH	GS
0 (Starved)	8	1.75±0.21^a	72.10±2.82^a,b	7.32±0.38	1.45±0.21^a
6	12	2.59±0.23^b,c	78.68±3.22^a	7.86±0.39	3.32±0.39^b
20	5	3.12±0.48^b	67.01±1.97^b	7.92±0.57	3.88±0.34^b
30	7	2.07±0.25^a,c	67.37±2.75^b	7.55±0.41	1.69±0.33^a
48	6	2.15±0.24^a,c	72.07±2.64^a,b	7.43±0.22	1.85±0.42^a

Time post feeding (h)	Enzyme activity (μmol min⁻¹ g⁻¹)
Time post feeding (h)		N	AAT	DAT	GDH	GS
0 (Starved)	8	1.75±0.21^a	72.10±2.82^a,b	7.32±0.38	1.45±0.21^a
6	12	2.59±0.23^b,c	78.68±3.22^a	7.86±0.39	3.32±0.39^b
20	5	3.12±0.48^b	67.01±1.97^b	7.92±0.57	3.88±0.34^b
30	7	2.07±0.25^a,c	67.37±2.75^b	7.55±0.41	1.69±0.33^a
48	6	2.15±0.24^a,c	72.07±2.64^a,b	7.43±0.22	1.85±0.42^a

AAT, alanine amino transferase; DAT, aspartate amino transferase; GDH,glutamate dehydrogenase; GS, glutamine synthetase.

Different lowercase letters indicate significant differences(P<0.05).