18 Result(s)
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Article
Anton Savitsky
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Open AccessHigh-field/High-frequency EPR Spectroscopy in Protein Research: Principles and Examples
During the last decades, the combined efforts of biologists, chemists, and physicists in develo** high-field/high-frequency EPR techniques and applying them to functional proteins have demonstrated that this...
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Open AccessMöbius-Strip Topology of Expanded Porphyrins: A Minireview on EPR, ENDOR and DFT MO Studies
The one-sided Möbius strip with its characteristic 180° twist in the loop has inspired philosophers, artists and scientists since hundreds of years and continues to do so. On the molecular level, only in the l...
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Open AccessDielectric Coupler for General Purpose Q-Band EPR Cavity
Here, we report on a robust and efficient mechanism for tuning the microwave coupling of a Q-band (34 GHz), general purpose, cylindrical EPR cavity operating in the TE011 mode. This novel mechanism allows for bot...
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Open AccessHydrogen-Bonded Complexes of Neutral Nitroxide Radicals with 2-Propanol Studied by Multifrequency EPR/ENDOR
The hydrogen bond plays a key role in weak directional intermolecular interactions. It is operative in determining molecular conformation and aggregation, and controls the function of many chemical systems, ra...
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Open AccessSpecial Issue of Applied Magnetic Resonance Celebrating the 85th Birthdays of Klaus Möbius and Kev M. Salikhov
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Cryo-EM photosystem I structure reveals adaptation mechanisms to extreme high light in Chlorella ohadii
Photosynthesis in deserts is challenging since it requires fast adaptation to rapid night-to-day changes, that is, from dawn’s low light (LL) to extreme high light (HL) intensities during the daytime. To under...
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Soft Dynamic Confinement of Membrane Proteins by Dehydrated Trehalose Matrices: High-Field EPR and Fast-Laser Studies
In memory of the 85th birthday of Yakov S. Lebedev (Moscow), who died in 1996, we start this Review on soft-glass matrix effects in donor–acceptor complexes with an appreciation of his pioneering work on high-...
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Open AccessAdsorption and activation of molecular oxygen over atomic copper(I/II) site on ceria
Supported atomic metal sites have discrete molecular orbitals. Precise control over the energies of these sites is key to achieving novel reaction pathways with superior selectivity. Here, we achieve selective...
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Nitroxide Spin Labels—Magnetic Parameters and Hydrogen-Bond Formation: A High-Field EPR and EDNMR Study
In this work, we report on a detailed high-field EPR investigation of magnetic parameters of deuterated nitroxide radicals dissolved in deuterated frozen solvents of polar or unpolar, protic or aprotic charact...
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Open AccessJim Hyde and the ENDOR Connection: A Personal Account
In this minireview, we report on our year-long EPR work, such as electron–nuclear double resonance (ENDOR), pulse electron double resonance (PELDOR) and ELDOR-detected NMR (EDNMR) at X-band and W-band microwav...
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Open AccessElectron transfer pathways in a light, oxygen, voltage (LOV) protein devoid of the photoactive cysteine
Blue-light absorption by the flavin chromophore in light, oxygen, voltage (LOV) photoreceptors triggers photochemical reactions that lead to the formation of a flavin-cysteine adduct. While it has long been as...
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Möbius–Hückel Topology Switching in Expanded Porphyrins: EPR, ENDOR, and DFT Studies of Doublet and Triplet Open-Shell Systems
The one-sided Möbius band topology with its characteristic 180° twist has fascinated and inspired philosophers, artists and scientists since a long time. On the molecular level, only in the last 13 years a few...
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Incorporation of a high potential quinone reveals that electron transfer in Photosystem I becomes highly asymmetric at low temperature
Photosystem I (PS I) has two nearly identical branches of electron-transfer co-factors. Based on point mutation studies, there is general agreement that both branches are active at ambient temperature but that...
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Photo-Induced Electron Spin Polarization in Chemical and Biological Reactions: Probing Structure and Dynamics of Transient Intermediates by Multifrequency EPR Spectroscopy
In this minireview, modern multifrequency electron paramagnetic resonance (EPR) spectroscopy, in particular, at high magnetic fields, is shown to provide detailed information about structure, motional dynamics...
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Open AccessThe Temperature Dependence of Nitroxide Spin–Label Interaction Parameters: a High-Field EPR Study of Intramolecular Motional Contributions
High-field W-band electron paramagnetic resonance (EPR) spectroscopy was utilized to study the temperature dependence of the magnetic interaction parameters (g-, hyperfine-, quadrupole tensors) of two types of do...
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Open AccessAlteration of the Axial Met Ligand to Electron Acceptor A0 in Photosystem I: Effect on the Generation of P 700 ·+ A 1 ·− Radical Pairs as Studied by W-band Transient EPR
Photosystem I (PS I) mutants from the cyanobacterium Synechocystis sp. PCC 6803 bearing point mutations to the axial ligands of A0A (M688NPsaA) and A0B (M668NPsaB) were studied by high-field W-band electron param...
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EPR, NMR, and Thermodynamic Evidences for Forced Nuclear Spin–Electron Spin Interactions in the Case of 1-Phenyl-2-Methylpropyl-1,1-Dimethyl-2-Nitroxide (TIPNO) Attached to Permethylated β-Cyclodextrin
In a recent paper (Bardelang et al. in J Org Chem 71:7657–7667, 2006), the deep inclusion of the TIPNO (1-phenyl-2-methylpropyl-1,1-dimethylethyl-2-nitroxide) free radical attached to a permethylated β-cyclodextr...
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High-field EPR
Among the numerous spectroscopic techniques utilized in photosynthesis research, high-field/high-frequency EPR and its pulse extensions ESE, ENDOR, ESEEM, and PELDOR play an important role in the endeavor to u...
