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or

symbol (in enzyme kinetics) for the value of the concentration of a substrate, A, in mol dm⁻³, at which the velocity of the reaction, v, is half the maximum velocity, V; i.e. when v = 0.5V.

[...]

symbol for the molar concentration of an agonist that produces 50% of the maximal possible effect of that agonist. Other percentage values ([A]₂₀, [A]₄₀, etc.) can be specified. The action of the...

symbol for any member of a series of oligonucleotides of the general formula p_a A[2′p5′A]_n, where p and A are phosphoric and adenosine residues, respectively, and a and n are ...

symbol for

1 acid‐catalysed (of a reaction mechanism).

2 a residue of the α‐amino acid l‐alanine (alternative to Ala).

3 a residue of the base adenine in a nucleic‐acid sequence.

[...]

1abbr. for adsorbed.

2symbol for atto+ (SI prefix denoting 10⁻¹⁸).

3 axial.

4 year.

symbol for

1 absorption coefficient.

2 acceleration (in vector equations it is printed in bold italic (a).

3 activity (def. 3).

4 van der Waals coefficient.

5as subscript, denotes affinity.

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symbol for

1 absorbance.

2 activity (def. 2).

3 affinity.

4 Helmholtz function.

5 mass number/nucleon number.

symbol for ångström (unit of length equal to 10⁻¹⁰ m).

The ratio of the sum of the adenine plus thymine bases to the sum of the guanine plus cytosine bases in a DNA molecule or preparation. The ratio is to ...