76.118.23.40: YEC's use of VSL deserves a mention only (and some wikilinkage), not a section. Extremely non-noteworthy and having undue weight.

2014-12-08T19:38:36Z

YEC's use of VSL deserves a mention *only* (and some wikilinkage), not a section. Extremely non-noteworthy and having undue weight.

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en>Alan U. Kennington: /* Einstein's VSL attempt in 1911 */ Grammar fix and improved the translation of a quotation.

2014-03-03T06:38:34Z

Einstein's VSL attempt in 1911: Grammar fix and improved the translation of a quotation.

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en>Monkbot: /* General critique of varying ''c'' cosmologies */Fix CS1 deprecated date parameter errors

2014-01-31T13:32:54Z

General critique of varying ''c'' cosmologies: Fix CS1 deprecated date parameter errors

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{{no footnotes|date=December 2010}}
[[Image:Epr spectrum.jpg|thumb|right|250px|[[Electron paramagnetic resonance|EPR]] spectrum of a spin label]]
A '''spin label''' ('''SL''') is an [[organic molecule]] which possesses an unpaired [[electron]], usually on a [[nitrogen]] atom, and the ability to bind to another molecule. Spin labels are normally used as tools for probing [[protein]]s or [[biological membrane]]-local dynamics using [[Electron paramagnetic resonance|EPR]] spectroscopy. The [[site-directed spin labeling]] (SDSL) technique allows one to monitor a specific region within a protein. In protein structure examinations, [[amino acid]]-specific SLs can be used.

The goal of spin labeling is somewhat similar to that of isotopic substitution in [[NMR spectroscopy]]. There one replaces an atom lacking a nuclear spin (and so is NMR-silent) with an isotope having a spin I <math>\neq</math> 0 (and so is NMR-active). This technique is useful for tracking the chemical environment around an atom when full substitution with an NMR-active isotope is not feasible. Recently, spin-labelling has also been used to probe chemical local environment in NMR itself, in a technique known as [[Paramagnetic]] Relaxation Enhancement (PRE).

==References==
Berliner, L.J. (1976). Spin labeling I : theory and applications, Academic Press, New York.

Berliner, L.J. (1979). Spin labeling II : theory and applications, Academic Press, New York.

[[Category:Spectroscopy]]

Variable speed of light - Revision history

76.118.23.40: YEC's use of VSL deserves a mention *only* (and some wikilinkage), not a section. Extremely non-noteworthy and having undue weight.

en>Alan U. Kennington: /* Einstein's VSL attempt in 1911 */ Grammar fix and improved the translation of a quotation.

en>Monkbot: /* General critique of varying ''c'' cosmologies */Fix CS1 deprecated date parameter errors

76.118.23.40: YEC's use of VSL deserves a mention only (and some wikilinkage), not a section. Extremely non-noteworthy and having undue weight.