Assessing the Functional Structure of Molecular Transporters - download pdf or read online

By Matthias J.N.Junk

ISBN-10: 364225134X

ISBN-13: 9783642251344

ISBN-10: 3642251358

ISBN-13: 9783642251351

In his thesis, Matthias Junk takes an cutting edge method of examine the neighborhood constitution and dynamics of organic and artificial amphiphilic macromolecules able to transporting small molecules. exchanging the latter with strong radicals, he makes use of cutting-edge electron paramagnetic resonance (EPR) spectroscopy to explain the hugely proper delivery functionality from the perspective of the visitor molecules. Such, he demonstrates that the useful constitution of human serum albumin in resolution considerably differs from its crystal constitution – a final result of the protein’s adaptability to host a variety of endogenous compounds and drug molecules. additional, he indicates that the thermal cave in of thermoresponsive hydrogels and dendronized polymers results in static and dynamic heterogeneities at the nanoscale. those heterogeneities undergo results for the material’s internet hosting homes and let unexpected advanced catalytic functionalities.

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Most CW EPR spectra in this thesis were analyzed by spectral simulations, performed with home-written Matlab programs based on various EasySpin routines. EasySpin is a simulation software developed by Stoll and Schweiger that provides routines for spectral simulations in a wide range of dynamic conditions [50, 51]. It subdivides four regimes of rotational motion: the isotropic limit, fast motion, slow motion, and the rigid limit. The fast tumbling of radicals in the isotropic limit leads to a complete averaging of rotational motion and the spectrum consists of symmetric lines with equal widths.

So far, this has been described in the picture of classical physics. In the next section, we will proceed to a quantum-mechanical description, and to the spin Hamiltonian which describes all magnetic interactions of the spin with its environment. 3 Types of Interactions and Spin Hamiltonian The spin Hamiltonian can be derived by the Hamiltonian of the whole system by separating the energetic contributions involving the spin from all other contributions [31]. e. other spins in the vicinity of the electron spin.

2 Hyperfine Sublevel Correlation (HYSCORE) Spectroscopy A modification of the 3-pulse ESEEM sequence is achieved by introduction of a non-selective p-pulse, which interchanges the nuclear coherences between the jai and jbi manifolds of the electron spin (Fig. 19a) [62]. The incrementation of both times prior to and after this pulse, t1 and t2 ; yields time-domain data in two dimensions which can be converted to 2D nuclear frequency spectra by Fourier transformation. This 2D EPR technique was invented in 1986 by Höfer et al.

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Assessing the Functional Structure of Molecular Transporters by EPR Spectroscopy by Matthias J.N.Junk

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