...Sara Comesaña; Marta Conde-Sieira; Cristina Velasco; José L. Soengas; Sofia Morais ABSTRACT To assess the putative role of taste and pre-absorptive sensing of amino acids in food intake control in fish, we carried out an oral administration with l -leucine, l -valine, l -proline or l -glutamic acid...

... and 2.5 mmol l −1 ) were hyperbolic functions of bilateral [Zn 2+ ], with a lower apparent zinc half-saturation constant ( K m ) at the higher amino acid concentration. L-[ 3 H]proline influx was a hyperbolic function of external [L-proline] ( K m =2.10±0.26 mmol l −1 ; J max =2290±600 pmol mg −1 protein...

...]proline uptake by these vesicles was Na + -dependent and greater at pH7.5 than at pH5.5. L-Pipecolate was a competitive inhibitor of L-proline influx into these BBMV, exhibiting a K i value of 0.02 mmol l −1 . The amino acid inhibitors, L-pipecolate, L-alanine and L-leucine were used as test substrates...