... and for preventing glutamate accumulation during hyperammonaemic conditions. * Author for correspondence ( [email protected] ) 22 3 2010 © 2010. 2010 glutamate glutamine MSOX alanine tryptophan stress Ammonia, a breakdown product of amino acid catabolism, can be a potent...

... attractant by bioassay-guided fractionation and high-performance liquid chromatography, and chemically identified it as the free-amino acid l -tryptophan ( l -Trp). In the present study, levels of this ecologically meaningful compound were quantified in various abalone tissues, and in freshly spawned eggs...

... transporters mediate Na + - or K + -coupled voltage-gradient-driven absorption of specific aromatic substrates. However,AgNAT6 (AAT07965) preferably absorbs tryptophan and indole-branched substrates, whereas AgNAT8 (AAN40409) preferably absorbs phenyl-branched substrates. To determine the physiological...

...-tryptophan was the natural sperm attractant in H. rufescens . Eggs released L-tryptophan at concentrations that triggered both activation and chemotaxis in sperm, exhibiting significant activity at levels as low as 10 -8 mol l -1 . The D-isomer of tryptophan was inactive,showing that the sperm response...

... is caused by an increased use (release) of 5-HT in these fish, and not by an increase in the level of tryptophan, the amino acid precursor of 5-HT. The relationships between social rank, food intake, growth, stress and brain serotonergic activity of fish in a social hierarchy are discussed. 2 3 1993...

...Svante Winberg; Göran E. Nilsson ABSTRACT Concentrations of serotonin (5-HT), 5-hydroxyindoleacetic acid (5-HIAA) and tryptophan (TRP, the amino acid precursor of 5-HT) were measured, and 5-HIAA/5-HT ratios calculated, in the telencephalon, hypothalamus and brain stem of Arctic charr ( Salvelinus...