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Overview page. Subjects: Chemistry.


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

in A Dictionary of Genetics

January 2007; p ublished 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


Jamie Woodward.

in The Ice Age

January 2014; p ublished 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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Willem J.M. Levelt.

in A History of Psycholinguistics

October 2012; p ublished 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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Brain Runciman.


March 2017; p ublished online September 2017 .

Journal Article. Subjects: Computing. 0 words.

A 1982 ZX Spectrum - among the first mainstream-audience home computers in the UK


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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Matthew E. Reynolds.

in The Oxford Handbook of Psychiatric Ethics

July 2015; p ublished online October 2014 .

Article. Subjects: Psychology; Clinical Psychology; Counselling Psychology. 1292 words.

5150: On Unethical Privacy is an autobiographical piece where Matthew Reynolds recounts the situation wherein he was involuntarily committed shortly before his 21st birthday. He describes...

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David Reynolds.


January 2008; p ublished online January 2008 .

Journal Article. Subjects: Computing. 0 words.

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Michael Allaby.

in A Dictionary of Ecology

January 2010; p ublished online January 2010 .

Reference Entry. Subjects: Ecology and Conservation. 12 words.

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