Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 37, Issue 2
Displaying 1-6 of 6 articles from this issue
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Preface
Journal
  • Suitability of Growth Models for Analyzing Microbial-Calorimetric Data
    Akiyo Sakamiya, Akiyoshi Tanaka
    2010 Volume 37 Issue 2 Pages 58-63
    Published: March 31, 2010
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.37.2_58
    JOURNAL FREE ACCESS
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    More than seven hundred microbial-calorimetric data of the processes of carbon-source assimilation by soil microbes and the processes of food putrefaction were analyzed by Gompertz, Hill, Richards and Logistic models, as well as by their reversed forms, to evaluate the suitability of these models for analyzing the data. The goodness of fit of each model to the experimental data was tested by the Akaike Information Criterion. The Richards model showed the best suitability. Consequently, the shape parameter d in this model is considered useful for accurate evaluation of microbial-calorimetric parameters such as the time at which the heat-evolution rate reaches its maximum (tp), the time at which half of the total heat evolution is completed (t1/2), and the maximum heat-evolution rate constant (µmax).
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Review
  • Electrical Conductivities of 1:1 Electrolytes in High-Temperature Methanol
    Kazuyasu Ibuki, Masakatsu Ueno
    2010 Volume 37 Issue 2 Pages 64-72
    Published: March 31, 2010
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.37.2_64
    JOURNAL FREE ACCESS
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    Molar ionic conductivity is one of the most basic properties characterizing the dynamic prcesses in electrolyte solutions. The sphere-in-continuum model is an important and useful framework for the theoretical calculation of ionic conductivity. So far, however, the validity and limitations of the continuum model have been examined only at thermodynamic conditions near ambient one. In this work, we review recent conductivity measurements of 1:1 electrolytes in high-temperature methanol, and discuss the application limit of the continuum model in the density region lower than the ambient one. For small monatomic ions, the continuum theory well explains the density dependence of conductivity at densities above 2ρc, where ρc is the critical density. For larger monatomic ions, we can recognize shortcomings of the continuum theory in ambient conditions, while the agreements between theory and experiment are improved by decreasing density down to 2ρc. At densities lower than 2ρc, the continuum theory is not successful in explaining the experimental conductivities.
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  • Thermodynamic Effects of Disulfide Bonds on the Structural Stability of Proteins
    Yoshihisa Hagihara
    2010 Volume 37 Issue 2 Pages 73-80
    Published: March 31, 2010
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.37.2_73
    JOURNAL FREE ACCESS
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    Disulfide bond has been believed to stabilize the proteins structure by restricting a freedom of the unfolded chain. To examine if this notion is true or not, I prepared the trypsin inhibitor and immunoglobulin fold domain mutants lacking or introducing the disulfide bonds. Thermodynamic analysis of these mutants indicates that the effects of disulfide bond on the stability of protein structure include conformational entropy of the native state and intramolecular interaction, in addition to the restriction of the unfolded chain.
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  • Rheology Measurement of Complex Fluids － Two Novel Methods －
    Maiko Hosoda, Keiji Sakai
    2010 Volume 37 Issue 2 Pages 81-88
    Published: March 31, 2010
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.11311/jscta.37.2_81
    JOURNAL FREE ACCESS
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    The dynamic aspect of the Brownian motion and the viscosity, as well as the thermal conduction, is described as the process of diffusion, of which temporal evolution is characterized by a diffusion constant. In this article, we introduce our recent studies on the field of rheology. One is the measurement of the local rheology in the vicinity of the solid boundary through the observation of the dynamic light scattering with the evanescent light source, and the other is the development of the Elecro-Magnetically Spinning (EMS) viscometer. In the former, we show the evidence of the anisotropic Brownian motion near the solid wall, and in the the latter, an idea for the ultra high viscosity measurement is also proposed.
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