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Rotational diffusion studied by passage saturation transfer electron paramagnetic resonance
A comprehensive description is given of instrumental and theoretical methods employed to make accurate measurements of rotational correlation times using passage saturation transfer electron
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 often
Hydrophobic barriers of lipid bilayer membranes formed by reduction of water penetration by alkyl chain unsaturation and cholesterol.
Results obtained in dioleoyl-PC-cholesterol membranes in the fluid phase are similar to those obtained in frozen membranes, and correlate well with permeability data for water and amino acids in the literature.
Oxygen permeability of phosphatidylcholine--cholesterol membranes.
The major results in the liquid-crystalline phase are as follows: in the absence of cholesterol, membranes are not barriers to oxygen transport, and addition of 50 mol % cholesterol decreases oxygen permeability and increases oxygen transport in the central regions of [Ole2]PtdCho membranes.
Eumelanins and pheomelanins: characterization by electron spin resonance spectroscopy.
Several natural eumelanins and pheomelanin have been characterized and shown to be copolymers and a simple parameterization of the spectra allows estimation of the relative amounts of dopa melanin and cysteinyldopa melanin in mixtures and of dopas incorporated intoCopolymers.
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 and strongly suggest an o-semiquinonimine structure.
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 using
Is the mammalian cell plasma membrane a barrier to oxygen transport?
Oxygen transport in the Chinese hamster ovary (CHO) plasma membrane has been studied and it is concluded that oxygen permeability through membranes can be reliably predicted from measurement of partition coefficients.