Alexander N. Volkov

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Lying at the heart of many vital cellular processes such as photosynthesis and respiration, biological electron transfer (ET) is mediated by transient interactions among proteins that recognize multiple binding partners. Accurate description of the ET complexes - necessary for a comprehensive understanding of the cellular signaling and metabolism - is(More)
Many biomolecular interactions proceed via a short-lived encounter state, consisting of multiple, lowly-populated species invisible to most experimental techniques. Recent development of paramagnetic relaxation enhancement (PRE) nuclear magnetic resonance (NMR) spectroscopy has allowed to directly visualize such transient intermediates in a number of(More)
The complex of yeast cytochrome c peroxidase and cytochrome c is a paradigm of the biological electron transfer (ET). Building on seven decades of research, two different models have been proposed to explain its functional redox activity. One postulates that the intermolecular ET occurs only in the dominant, high-affinity protein-protein orientation, while(More)
The Direct Simulation Monte Carlo (DSMC) technique is used here to describe the transition region in Titan's atmosphere where the gas flow goes from being collisional to collisionless. We expand on our previous study (Tucker, O. by including H 2 in addition to CH 4 and N 2. We again find that thermal escape of CH 4 is Jeans-like, contrary to what has been(More)
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