... studies of amino acid uptake by lepidopteran midgut vesicles have focused on symport kinetics ( Parenti et al . 1992 ), on ion specificity ( Hennigan et al . 1993 b ) or on defining amino acid cohorts that share the same pathway (e.g. Giordana et al . 1989 ). In this report, we explore the connection...

... in the developing embryos. 12 6 1992 © 1992 by Company of Biologists 1992 embryos Zoarces viviparus amino acid uptake metabolism. Previous studies have shown that embryos, larvae and juveniles from different teleost species have the ability to take up low molecular weight...

... of influx of these amino acids at these concentrations. The total concentration of FAA employed (18 μ mol 1 -1 ) is low compared with the reported half-saturation parameters for amino acid uptake, so this is not unexpected. In no case was leakage of any amino acid from the animals into the medium observed...