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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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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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14

Robert C. King, William D. Stansfield and Pamela K. Mulligan.

in A Dictionary of Genetics

January 2007; published online January 2007.

Reference Entry. Subjects: genetics and genomics. 32 words.

C a radioactive isotope of normal carbon (12C) emitting a weak beta particle. The half-life of 14C

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1840

in The Ice Age

January 2014; published online January 2014.

Chapter. Subjects: earth sciences and geography. 3425 words.

‘1840’ describes the remarkable year when Louis Agassiz came to England to publicise his glacial theory. With new converts, William Buckland and Charles Lyell, Agassiz presented papers on...

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1951

Willem J.M. Levelt.

in A History of Psycholinguistics

October 2012; published online January 2013.

Chapter. Subjects: cognitive psychology. 7430 words.

Psycholinguistics is a discipline that was said to have emerged in 1951, which was also the time when three notable events occurred. This chapter discusses these three landmark events that...

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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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59.5

David Reynolds.

in ITNOW

January 2008; published online January 2008.

Journal Article. Subjects: computing. 0 words.

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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: mathematics.

The number 10 in hexadecimal notation.

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