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Interactions of Melanin with Metal Ions. Electron Spin Resonance Evidence for Chelate Complexes of Metal Ions with Free Radicals
ESR experiments reveal, for the first time, that di- and tripositive metal ions bind to o-semiquinone radical centers within melanin polymers to yield chelate complexes. The binding is oftenExpand
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Hydrophobic barriers of lipid bilayer membranes formed by reduction of water penetration by alkyl chain unsaturation and cholesterol.
The hydrophobicity profiles across phosphatidylcholine (PC)-cholesterol bilayer membranes were estimated in both frozen liposome suspensions and fluid-phase membranes as a function of alkyl chainExpand
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Oxygen permeability of phosphatidylcholine--cholesterol membranes.
Oxygen transport in phosphatidylcholine-cholesterol membranes has been studied by observing the collision of molecular oxygen with nitroxide radical spin labels placed at various distances from theExpand
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Eumelanins and pheomelanins: characterization by electron spin resonance spectroscopy.
Synthetic dopa melanin and cysteinyldopa melanin have different electron spin resonance spectra. Data are reported for mixtures of these melanins and for dopa-cysteinyldopa copolymers, which areExpand
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Conformation of spin-labeled melittin at membrane surfaces investigated by pulse saturation recovery and continuous wave power saturation electron paramagnetic resonance.
Melittin spin-labeled specifically with a nitroxide at positions 7, 21, 23, or the amino terminus was bound to phospholipid membranes, and the exposure of the spin label to the aqueous phase wasExpand
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Novel free radicals in synthetic and natural pheomelanins: distinction between dopa melanins and cysteinyldopa melanins by ESR spectroscopy.
Synthetic pheomelanins from enzymic oxidation of the 3,4-dihydroxyphenylalanine (dopa) derivative 5-S-cysteinyldopa have been examined by ESR spectroscopy. These alkalisoluble polymers contain aExpand
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Permeability of nitric oxide through lipid bilayer membranes.
Profiles of the local nitric oxide (.NO) diffusion-concentration product across the egg yolk phosphatidylcholine membrane in the absence and presence of 30 mol% cholesterol were obtained usingExpand
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Effects of oxygen on EPR spectra of nitroxide spin-label probes of model membranes
Abstract The use of a methylpentene polymer, TPX, for construction of sample containers that allow easy equilibration of electron paramagnetic resonance samples with nitrogen is described. TheExpand
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Is the mammalian cell plasma membrane a barrier to oxygen transport?
Oxygen transport in the Chinese hamster ovary (CHO) plasma membrane has been studied by observing the collision of molecular oxygen with nitroxide radical spin labels placed in the lipid bilayerExpand
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