Metabolism of amino acids differs in the brains of Djungarian hamster (P. sungorus) and Roborovskii hamster (P. roborovskii)

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Table 2 Concentrations of L- and D-amino acids in the liver of Djungarian and Roborovskii hamsters during light and dark periods

Amino acids	Djungarian hamster		Roborovskii hamster		Results of ANOVA
	Light	Dark	Light	Dark	Species	Time	Interaction
Essential amino acids
L-Valine	375 ± 24	518 ± 40	510 ± 22	867 ± 69	P < 0.01	P < 0.01	P < 0.05
L-Histidine	1978 ± 346	1672 ± 190	2530 ± 151	2912 ± 238	P < 0.01	NS	NS
L-Methionine	99 ± 7	162 ± 16	181 ± 9	333 ± 38	P < 0.01	P < 0.01	NS
L-Tryptophan	207 ± 19	242 ± 6	260 ± 11	334 ± 24	P < 0.01	P < 0.01	NS
L-Phenylalanine	183 ± 5	266 ± 13	318 ± 16	483 ± 44	P < 0.01	P < 0.01	NS
L-Leucine	548 ± 31	783 ± 53	747 ± 33	1218 ± 100	P < 0.01	P < 0.01	NS
L-Isoleucine	203 ± 14	273 ± 19	274 ± 11	453 ± 36	P < 0.01	P < 0.01	P < 0.05
Nonessential amino acids
L-Serine	516 ± 45	798 ± 81	682 ± 19	1212 ± 114	P < 0.01	P < 0.01	NS
Taurine	1925 ± 180	2116 ± 181	2282 ± 125	3474 ± 340	P < 0.01	P < 0.01	P < 0.05
L-Aspartic acid	315 ± 22	384 ± 34	732 ± 30	840 ± 44	P < 0.01	P < 0.05	NS
D-Aspartic acid	17.3 ± 0.9	16.8 ± 1.0	26.8 ± 1.7	27.5 ± 1.1	P < 0.01	NS	NS
L-Alanine	4139 ± 564	4064 ± 288	5220 ± 136	7112 ± 569	P < 0.01	P < 0.05	P < 0.05
L-Glutamine	4598 ± 269	5142 ± 603	6837 ± 478	6328 ± 222	P < 0.01	NS	NS
L-Arginine	18.9 ± 2.0	27.9 ± 2.6	41.4 ± 1.9	45.5 ± 3.3	P < 0.01	P < 0.05	NS
L-Tyrosine	203 ± 8	259 ± 9	251 ± 9	463 ± 45	P < 0.01	P < 0.01	P < 0.01
D-Tyrosine	152 ± 12	180 ± 18	285 ± 23	376 ± 10	P < 0.01	P < 0.01	NS
GABA	60.2 ± 4.2	58.0 ± 2.2	64.9 ± 4.0	75.7 ± 7.5	P < 0.05	NS	NS

Values are means ± S.E.M. in pmol/mg wet tissue; n = 5–7 in each group; NS: Not significant.