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Nuclear coupling of /sup 33/S and the nature of free radicals in irradiated crystals of N-acetyl-L-cysteine. [X radiation]

Journal Article · · Proc. Natl. Acad. Sci. U.S.A.; (United States)
 [1];
  1. Georgia State Univ., Atlanta
+ Show Author Affiliations

Hyperfine structure due to /sup 33/S in its natural abundance of 0.76% has been measured in the electron spin resonance of free radicals produced by x-irradiation of single crystals of N-acetyl-L-cysteine at 77 K. These measurements proved that the radicals produced at 77 K with principal g values of 1.990, 2.006, and 2.214 are monosulfide radicals with the 3p unpaired electron density of 0.70 on the S. They are believed to be negatively charged molecules RCH/sub 2/S/sup -/H or neutral RCH/sub 2/SH/sub 2/ radicals in which 90% of the spin density of the captured electron is concentrated in a d-p hybrid orbital on the S. As the temperature is raised to 300/sup 0/K, these, as well as the carbon-centered radicals produced at the lower temperature, are mostly converted to neutral disulfide radicals RCH/sub 2/SS like those observed in irradiated cysteine.

OSTI ID:
7224227
Journal Information:
Proc. Natl. Acad. Sci. U.S.A.; (United States), Journal Name: Proc. Natl. Acad. Sci. U.S.A.; (United States) Vol. 74:1; ISSN PNASA
Country of Publication:
United States
Language:
English

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Related Subjects

560111* -- Radiation Effects on Biochemicals-- In Vitro-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMINO ACIDS
BIOCHEMISTRY
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CARBOXYLIC ACIDS
CHEMISTRY
COUPLING
CRYSTALS
CYSTEINE
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
EVEN-ODD NUCLEI
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MOLECULAR STRUCTURE
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RADIATION EFFECTS
RADIATIONS
RADICALS
RESONANCE
STABLE ISOTOPES
SULFUR 33
SULFUR ISOTOPES
THIOLS
X RADIATION