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0.5

Overview page. Subjects: chemistry.

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.

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50

Overview page. Subjects: chemistry.

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...

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2′-5′A

Overview page. Subjects: chemistry.

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 ...

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A

Overview page. Subjects: chemistry.

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.

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a

Overview page. Subjects: chemistry.

1abbr. for adsorbed.

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

3 axial.

4 year.

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a

Overview page. Subjects: chemistry.

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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A

Overview page. Subjects: chemistry.

symbol for

1 absorbance.

2 activity (def. 2).

3 affinity.

4 Helmholtz function.

5 mass number/nucleon number.

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Å

Overview page. Subjects: chemistry.

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

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(A + T)/(G + C) ratio

Overview page. Subjects: chemistry.

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 ...

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A ‘one-pot’ assay for the accessibility of DNA in a nucleosome core particle

Chenyi Wu and Andrew Travers.

in Nucleic Acids Research

January 2004; published online January 2004.

Journal Article. Subjects: chemistry; bioinformatics and computational biology; genetics and genomics; molecular and cell biology. 3403 words.

The accessibility of nucleosomal DNA to transcription factors and other sequence-specific DNA binding proteins is of importance in the consideration of mechanisms of transcriptional control....

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