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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...

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14

Overview page. Subjects: Genetics and Genomics.

C a radioactive isotope of normal carbon (12C) emitting a weak beta particle. The half-life of 14C is 5,700 years. This radioisotope is extensively used as a tracer in molecular biology.

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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...

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a

Overview page. Subjects: Ecology and Conservation.

The usual abbreviation for year (from the Latin annus, meaning year).

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2′-5′A

Overview page. Subjects: Chemistry.

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...

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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).

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A

Overview page. Subjects: Mathematics.

The number 10 in hexadecimal notation.

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a

Overview page. Subjects: Chemistry.

1 abbr. for adsorbed.

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

3 axial.

4 year.

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A

Overview page. Subjects: Genetics and Genomics.

1. mass number of an atom; 2. haploid set of autosomes; 3. ampere; 4. adenine or adenosine.

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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).

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