2. Symbol for atto-, Bunsen's solubility coefficient, specific optical rotation, absorbance, specific absorption coefficient, degree of dissociation, adenosine or adenylic acid in polynucleotides, alanine in polypeptides, first substrate in a multisubstrate enzyme=catalyzed reaction
3. In chemistry, denotes the first in a series, a position immediately adjacent to a carboxyl group, the first of a series of closely related compounds, an aromatic substituent on an aliphatic chain, or the direction of a chemical bond away from the viewer.
(05 Mar 2000)
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