1-Pyrroline-5-Carboxylate DehydrogenasePyrroline Carboxylate ReductasesProline OxidaseOxidoreductases Acting on CH-NH Group DonorsProline2-Aminoadipic AcidL-Lysine 6-TransaminaseCyclic N-OxidesSpin TrappingSpin LabelsFree RadicalsBacterial ProteinsElectron Spin Resonance SpectroscopyL-Lactate DehydrogenaseNitrogen OxidesAlcohol DehydrogenaseHydroxyl Radical