2 research outputs found
Double Electron−Electron Resonance Measured Between Gd<sup>3+</sup> Ions and Nitroxide Radicals
Double electron−electron resonance has attracted growing attention as a technique to study structure and conformational changes of biomacromolecules. Here, a new combination of paramagnetic labels is experimentally tested, one being a commonly used nitroxide radical, and the other being a Gd<sup>3+</sup> ion. The Gd<sup>3+</sup>−nitroxide spin pair can serve as a good substitute for the nitroxide−nitroxide pair of spin labels and potentially provides a link to other experimental approaches dealing with structural information
Multiple Pathway Relaxation Enhancement in the System Composed of Three Paramagnetic Species: Nitroxide Radical–Ln<sup>3+</sup>–O<sub>2</sub>
Longitudinal relaxation of nitroxide spin-labels has
been measured
for a membrane-incorporated α-helical polypeptide in the presence
and absence of residual amounts of membrane-dissolved O<sub>2</sub> and paramagnetic Dy<sup>3+</sup> ions. Such a model system, containing
three different types of paramagnetic species, provides an important
example of nonadditivity of two different relaxation channels for
the nitroxide spins