The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

Keitaro Kiyosawa - One of the best experts on this subject based on the ideXlab platform.

  • theoretical and experimental studies on freezing Point Depression and vapor pressure deficit as methods to measure osmotic pressure of aqueous polyethylene glycol and bovine serum albumin solutions
    Biophysical Chemistry, 2003
    Co-Authors: Keitaro Kiyosawa
    Abstract:

    For survival in adverse environments where there is drought, high salt concentration or low temperature, some plants seem to be able to synthesize biochemical compounds, including proteins, in response to changes in water activity or osmotic pressure. Measurement of the water activity or osmotic pressure of simple aqueous solutions has been based on freezing Point Depression or vapor pressure deficit. Measurement of the osmotic pressure of plants under water stress has been mainly based on vapor pressure deficit. However, differences have been noted for osmotic pressure values of aqueous polyethylene glycol (PEG) solutions measured by freezing Point Depression and vapor pressure deficit. For this paper, the physicochemical basis of freezing Point Depression and vapor pressure deficit were first examined theoretically and then, the osmotic pressure of aqueous ethylene glycol and of PEG solutions were measured by both freezing Point Depression and vapor pressure deficit in comparison with other aqueous solutions such as NaCl, KCl, CaCl(2), glucose, sucrose, raffinose, and bovine serum albumin (BSA) solutions. The results showed that: (1) freezing Point Depression and vapor pressure deficit share theoretically the same physicochemical basis; (2) theoretically, they are proportional to the molal concentration of the aqueous solutions to be measured; (3) in practice, the osmotic pressure levels of aqueous NaCl, KCl, CaCl(2), glucose, sucrose, and raffinose solutions increase in proportion to their molal concentrations and there is little inconsistency between those measured by freezing Point Depression and vapor pressure deficit; (4) the osmotic pressure levels of aqueous ethylene glycol and PEG solutions measured by freezing Point Depression differed from the values measured by vapor pressure deficit; (5) the osmotic pressure of aqueous BSA solution measured by freezing Point Depression differed slightly from that measured by vapor pressure deficit.

  • Theoretical and experimental studies on freezing Point Depression and vapor pressure deficit as methods to measure osmotic pressure of aqueous polyethylene glycol and bovine serum albumin solutions
    Biophysical Chemistry, 2003
    Co-Authors: Keitaro Kiyosawa
    Abstract:

    For survival in adverse environments where there is drought, high salt concentration or low temperature, some plants seem to be able to synthesize biochemical compounds, including proteins, in response to changes in water activity or osmotic pressure. Measurement of the water activity or osmotic pressure of simple aqueous solutions has been based on freezing Point Depression or vapor pressure deficit. Measurement of the osmotic pressure of plants under water stress has been mainly based on vapor pressure deficit. However, differences have been noted for osmotic pressure values of aqueous polyethylene glycol (PEG) solutions measured by freezing Point Depression and vapor pressure deficit. For this paper, the physicochemical basis of freezing Point Depression and vapor pressure deficit were first examined theoretically and then, the osmotic pressure of aqueous ethylene glycol and of PEG solutions were measured by both freezing Point Depression and vapor pressure deficit in comparison with other aqueous solutions such as NaCl, KCl, CaCl2, glucose, sucrose, raffinose, and bovine serum albumin (BSA) solutions. The results showed that: (1) freezing Point Depression and vapor pressure deficit share theoretically the same physicochemical basis; (2) theoretically, they are proportional to the molal concentration of the aqueous solutions to be measured; (3) in practice, the osmotic pressure levels of aqueous NaCl, KCl, CaCl2, glucose, sucrose, and raffinose solutions increase in proportion to their molal concentrations and there is little inconsistency between those measured by freezing Point Depression and vapor pressure deficit; (4) the osmotic pressure levels of aqueous ethylene glycol and PEG solutions measured by freezing Point Depression differed from the values measured by vapor pressure deficit; (5) the osmotic pressure of aqueous BSA solution measured by freezing Point Depression differed slightly from that measured by vapor pressure deficit. © 2003 Elsevier Science B.V. All rights reserved.

Paola Gallo - One of the best experts on this subject based on the ideXlab platform.

  • molecular dynamics simulations of freezing Point Depression of tip4p 2005 water in solution with nacl
    Journal of Molecular Liquids, 2018
    Co-Authors: M M Conde, Mauro Rovere, Paola Gallo
    Abstract:

    Abstract Molecular dynamics simulations have been performed on an aqueous solution of TIP4P/2005 water and NaCl using the direct coexistence technique to determine the equilibrium line ice/NaCl solution and the freezing Point Depression of water in presence of NaCl at different salt concentrations below the eutectic Point. We used large samples in order to avoid finite size effects and to minimize the error on the determination of the freezing temperature. Our results are in excellent agreement with the experimental freezing Point Depression showing that the set of parameters used in this work for the water and NaCl is a very good choice to reproduce the thermodynamic properties of the water/NaCl system with molecular dynamics simulations.

  • Molecular dynamics simulations of freezing-Point Depression of TIP4P/2005 water in solution with NaCl
    Journal of Molecular Liquids, 2018
    Co-Authors: M M Conde, Mauro Rovere, Paola Gallo
    Abstract:

    Abstract Molecular dynamics simulations have been performed on an aqueous solution of TIP4P/2005 water and NaCl using the direct coexistence technique to determine the equilibrium line ice/NaCl solution and the freezing Point Depression of water in presence of NaCl at different salt concentrations below the eutectic Point. We used large samples in order to avoid finite size effects and to minimize the error on the determination of the freezing temperature. Our results are in excellent agreement with the experimental freezing Point Depression showing that the set of parameters used in this work for the water and NaCl is a very good choice to reproduce the thermodynamic properties of the water/NaCl system with molecular dynamics simulations.

L H Allen - One of the best experts on this subject based on the ideXlab platform.

  • size dependent melting Point Depression of nanostructures nanocalorimetric measurements
    Physical Review B, 2000
    Co-Authors: M. Zhang, Yu M Efremov, A T Kwan, T Wisleder, E. A. Olson, François Schiettekatte, J E Greene, L H Allen
    Abstract:

    The melting behavior of 0.1\char21{}10-nm-thick discontinuous indium films formed by evaporation on amorphous silicon nitride is investigated by an ultrasensitive thin-film scanning calorimetry technique. The films consist of ensembles of nanostructures for which the size dependence of the melting temperature and latent heat of fusion are determined. The relationship between the nanostructure radius and the corresponding melting Point and latent heat is deduced solely from experimental results (i.e., with no assumed model) by comparing the calorimetric measurements to the particle size distributions obtained by transmission electron microscopy. It is shown that the melting Point of the investigated indium nanostructures decreases as much as 110 K for particles with a radius of 2 nm. The experimental results are discussed in terms of existing melting Point Depression models. Excellent agreement with the homogeneous melting model is observed.

Donald J Winzor - One of the best experts on this subject based on the ideXlab platform.

M M Conde - One of the best experts on this subject based on the ideXlab platform.

  • molecular dynamics simulations of freezing Point Depression of tip4p 2005 water in solution with nacl
    Journal of Molecular Liquids, 2018
    Co-Authors: M M Conde, Mauro Rovere, Paola Gallo
    Abstract:

    Abstract Molecular dynamics simulations have been performed on an aqueous solution of TIP4P/2005 water and NaCl using the direct coexistence technique to determine the equilibrium line ice/NaCl solution and the freezing Point Depression of water in presence of NaCl at different salt concentrations below the eutectic Point. We used large samples in order to avoid finite size effects and to minimize the error on the determination of the freezing temperature. Our results are in excellent agreement with the experimental freezing Point Depression showing that the set of parameters used in this work for the water and NaCl is a very good choice to reproduce the thermodynamic properties of the water/NaCl system with molecular dynamics simulations.

  • Molecular dynamics simulations of freezing-Point Depression of TIP4P/2005 water in solution with NaCl
    Journal of Molecular Liquids, 2018
    Co-Authors: M M Conde, Mauro Rovere, Paola Gallo
    Abstract:

    Abstract Molecular dynamics simulations have been performed on an aqueous solution of TIP4P/2005 water and NaCl using the direct coexistence technique to determine the equilibrium line ice/NaCl solution and the freezing Point Depression of water in presence of NaCl at different salt concentrations below the eutectic Point. We used large samples in order to avoid finite size effects and to minimize the error on the determination of the freezing temperature. Our results are in excellent agreement with the experimental freezing Point Depression showing that the set of parameters used in this work for the water and NaCl is a very good choice to reproduce the thermodynamic properties of the water/NaCl system with molecular dynamics simulations.