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.
Methodological studies within INTERTRAP will develop an integrated approach using optically stimulated luminescence, thermoluminescence and electron spin resonance
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.
electron spin resonance
spectrometer x-band (9.8ghz) and q (34ghz) with variable temperature control system (100 k, 600 k) and maximum field electromagnet least 17.5 kg;
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.