title: Environmental factors influencing the hyperfine structure of manganous low-temperature electron paramagnetic resonance spectra.
abstract: Hyperfine structure is observed in low temperature (T = -180 degrees C) EPR (electron paramagnetic resonance) spectra of a number of solutions containing Mn(++) ions 13, 15) which have characteristics in common with low temperature EPR spectra from biological substances such as mitochondria and microsomes (1-4). This investigation is an attempt to understand the features of these signals in terms of the molecular environment of the manganous ion, and a qualitative explanation for the observations reported here is advanced in terms of the amount of axial distortion of a manganese hydrate in different environments.
mesh_terms: D002712:Chlorides; D003580:Cytochromes / Q000494:pharmacology; D004578:Electron Spin Resonance Spectroscopy; D008345:Manganese / Q000032:analysis*; D008861:Microsomes; D008928:Mitochondria; D008962:Models, Theoretical; D011189:Potassium Chloride; D011479:Protamines / Q000494:pharmacology; D012710:Serum Albumin, Bovine / Q000494:pharmacology; D012996:Solutions / Q000032:analysis*; D013431:Sulfates; D013696:Temperature
chemical_list: D002712:Chlorides; D003580:Cytochromes; D011479:Protamines; D012996:Solutions; D013431:Sulfates; D012710:Serum Albumin, Bovine; D008345:Manganese; D011189:Potassium Chloride