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Aliquot
A measured portion divided off from a larger stock. Splitting a reconstituted vial into single-use aliquots is the standard defence against repeated freezing.
Aliquoting Peptide Solutions: Vials, Volumes and Avoiding Contamination
Splitting a stock trades a calculable transfer loss for the end of repeated freeze-thaw damage. Below about 100 µL that trade stops paying — here is where the line sits and how to run the split.
Amide (C-Terminal Amidation)
Conversion of a peptide's C-terminal carboxylic acid into a primary amide (–CONH2), mimicking a natural modification and shifting the expected mass by about 1 Da.
Amino Acid
The monomer unit of every peptide: an alpha-carbon carrying an amino group, a carboxyl group and a variable side chain that dictates the residue's chemistry.
AMPK
AMP-activated protein kinase: a heterotrimeric energy sensor switched on when the AMP:ATP ratio rises, shifting cells from anabolic to catabolic metabolism.
Amylin
A 37-amino-acid hormone co-secreted with insulin from pancreatic beta-cells, acting at calcitonin-receptor complexes to signal satiation.
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