a

1. First letter of the Greek alphabet, alpha, used as a classifier in the nomenclature of many sciences.

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.

4. <abbreviation> Alpha particle, ampere, adenine, alanine, Helmholtz energy, total acidity, ante, area, asymmetric, auris, artery, arteria, absorptivity, alveolar gas, systemic arterial blood.

(05 Mar 2000)


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