Results 111 to 120 of about 106,996 (148)
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Dynamics of the Hydration Water of Antifreeze Glycoproteins
The Journal of Physical Chemistry Letters, 2016Antifreeze glycoproteins (AFGPs) are unique proteins that inhibit the growth of ice by a mechanism that is still unclear. We study the dynamics of water in aqueous solutions of small and large isoforms of AFGPs using polarization-resolved femtosecond infrared spectroscopy.
Carien C M, Groot +3 more
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Bio-Macromolecules and Hydration Water Dynamics
2011Biological macromolecules are dynamic entities, a characteristic which is essential for them to carry out their functions. The vast majority of biological processes are mediated by water and the extent to which macromolecules are hydrated and the solvent type modulate their dynamics.
Kathleen Wood, Martin Weik
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Anomalous Dynamics of Hydration Water in Carbohydrate Solutions
The Journal of Physical Chemistry B, 2009Molecular dynamics simulations have been carried out to investigate the dynamics of fructose aqueous solutions up to 70 wt % concentration. We find that the hydrogen (H)-bonded network of fructose molecules extends with increasing sugar content and forms a structurally heterogeneous system around and above 45 wt % concentration, characterized as a ...
Matías H H, Pomata +3 more
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Age-dependent dynamics of water in hydrated cement paste
Physical Review E, 2001Self-dynamics of water molecules has been studied in hydrated tricalcium silicate as functions of temperature, aging, and in the presence of an additive. A dynamical model taking into account the existence of "immobile water" and "glassy water" has been used to analyze quasielastic neutron spectrometer spectra.
FRATINI, EMILIANO +3 more
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How Protein Surfaces Induce Anomalous Dynamics of Hydration Water
The Journal of Physical Chemistry B, 2007Water around biomolecules slows down with respect to pure water, and both rotation and translation exhibit anomalous time dependence in the hydration shell. The origin of such behavior remains elusive. We use molecular dynamics simulations of water dynamics around several designed protein models to establish the connection between the appearance of the
Pizzitutti, Francesso +3 more
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Dynamics of hydration water in CaCl2 complexes
Chemical Physics Letters, 2006Abstract We report in this Letter the measurement of unusually well-defined vibrational modes of water. Calcium chloride forms complexes made of different amounts of water, namely 1/3, 2 or 4 water per CaCl2 molecule. Based on the crystallographic structure, we performed normal mode calculations from first principles, and simulated the neutron ...
Plazanet, M. +4 more
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Hydration shell exchange dynamics for in water
Journal of Physics: Condensed Matter, 1996Molecular dynamics is applied to the title problem. It is shown how the methodology for solution reactions easily allows for a detailed study of the interchange, which has a rather complex character with unexpected dynamical features. The methodology can be applied with equal ease to cases with very different lifetimes including those with strongly ...
Rossend Rey, James T Hynes
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Biological Water: Femtosecond Dynamics of Macromolecular Hydration
The Journal of Physical Chemistry B, 2002The unique features of a macromolecule and water as a solvent make the issue of solvation unconventional, with questions about the static versus dynamic nature of hydration and the physics of orientational and translational diffusion at the boundary. For proteins, the hydration shell that covers the surface is critical to the stability of its structure
Pal, Samir Kumar +3 more
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Vibrational dynamics of hydration water in amylose
Applied Physics A: Materials Science & Processing, 2002We present a study of the dynamical properties of hydration water associated with amylose helices, based on low-temperature vibrational spectra collected using the TOSCA inelastic spectrometer at ISIS. The structural constraints of the polysaccharidic chains favour the formation of a high-density structure for water, which has been suggested by Imberty
CAVATORTA, Fabrizio +3 more
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Water in the hydrated protein powders: Dynamic and structure
The Journal of Chemical Physics, 2019It is not an understatement to say that the interplay between water and protein is a fundamental aspect of life. The vitality of an organism depends on the functionality of its biological machinery, and this, in turn, is mediated in water. Yet, we understand surprisingly little about the nature of the interface between bulk water and the protein.
Kaito Sasaki, Ivan Popov, Yuri Feldman
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