Baffa, O., (2008): Electron spin resonance
dating of human teeth from Toca da Santa shelter of Sao Raimundo Nonato, Piaui, Brazil.
For electron spin resonance
(ESR) studies, we obtained solvent-extractable free radicals from 1,3-butadiene soot from brief liquid-solid extractions with ultra-pure toluene, DMSO:water (4:1, v/v), n-hexane, and 3% aqueous sodium dodecyl sulfate.
Chemists and engineers describe current techniques for investigating polymers using electron spin resonance
Electron spin resonance
spectroscopy studies have shown that *OH are generated in a DNA-free solution containing Cr(III) and [H.sub.2][O.sub.2] (43).
Although some investigators maintain that the age of the Klasies River Mouth caves remains in question, Caspari and Wolpoff say several converging lines of evidence -- including electron spin resonance
data and the presence of extinct animal remains -- convincingly date the site to about 100,000 years ago.
Also discussed are electron spin resonance
, nuclear magnetic resonance, and nuclear-resonance tomography.
However, another technique called electron spin resonance
(SN: 4/29/89, p.263) yields an age estimate of only about 60,000 years at the same cave.
Stringer's group calculated the age estimate through electron spin resonance
(ESR) dating, a technique used with several archaeological samples over the last decade.
A preliminary estimate, based on a technique called electron spin resonance
(ESR), is that the piece of skull is 15,400 years old.
Simic is also using electron spin resonance
(ESR) to detect food-borne free radicals--highly reactive chemical compounds that appear in bone or cuticle (such as shrimp shell) after exposure to irradiation.