orsymbol (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 pa A[2′p5′A]n, where p and A are phosphoric and adenosine residues, respectively, and a and n are ...
symbol for1 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.[...]
1 abbr. for adsorbed.2 symbol for atto+ (SI prefix denoting 10−18).3 axial.4 year.
symbol for1 absorption coefficient.2 acceleration (in vector equations it is printed in bold italic (a).3 activity (def. 3).4 van der Waals coefficient.5 as subscript, denotes affinity.[...]
symbol for1 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 ...
(formerly) an alternative name for D cell.