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  • 1
    Electronic Resource
    Electronic Resource
    A simple statistical mechanical theory for the mutual solubility of fluid mixtures of water and organic solvents under high pressure (1988)
    Springer
    Journal of solution chemistry 17 (1988), S. 637-651 
    Details
    ISSN: 1572-8927
    Keywords: Fluid mixtures ; critical solution temperature ; high pressure ; excess volume ; miscibility ; phase diagram ; statistical mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A simple statistical mechanical theory is presented to explain phase diagrams of fluid mixtures with both a lower critical solution temperature and an upper critical solution temperature under pressure. By postulating a temperature dependence for the interaction free energy parameter of the constituent molecules and a pressure dependence for the excess volume, phase diagrams with both lower critical solution temperature, and upper critical solution temperature and their pressure dependence can be reproduced by quadratic surfaces in temperature-concentration-pressure space. The topological aspects of the observed phase diagrams in this space have been related to our theoretical model, and the thermodynamical meaning of the topologies has been interpreted based on our model. Experimental data for the mutual solubility of water and 2-butanol under pressure and that of water and 3-methylpyridine with added salts have been analyzed quantitatively and theoretical parameters are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645975
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of inhalation anesthetics on swimming activity of artemia salina (1991)
    Springer
    Journal of anesthesia 5 (1991), S. 287-293 
    Details
    ISSN: 1438-8359
    Keywords: Inhalation anesthetics ; Artemia salina ; Motility ; Video monitoring ; Cooperativity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The swimming movement of artemia salina in the artificial sea water was measured by using the video camera system in the absence and presence of anesthetics, i.e. enflurane, halothane, and isoflurane. The movement of artemia looked random at a glance but the obtained distribution curve for the swimming speed was skewed toward the high speed side somewhat resembling a Maxwellian distribution curve seen in the statistics of ideal gases. When anesthetic were added, the distribution curve became sharpened and shifted to the low speed side, which is similar to a behavior of ideal gasses when they are cooled down. The mean swimming-speed was decreased eventually leading to an irreversible death with increasing the anesthetic dose. The activity was analyzed by using the hydrodynamic equation. The ED50, which is a dose that causes a 50% reduction in the activity, of all anesthetics used in this study was quite similar to the MAC values for human. It was also suggested that an interaction between anesthetics and artemia was highly cooperative since the larger Hill coefficients were obtained for all three anesthetics used. (Takasaki T, Tatara T, Suezaki Y, et al.: Effect of inhalation anesthetics on swimming activity of artemia salina. J Anesth 5: 287–293, 1991)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0054010050287
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of the formation of triple helices between (pro-pro-gly)n's of different degrees of polymerization using gel filtration (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 247-257 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The properties of triple-helix formation of (Pro-Pro-Gly)n were studied. The probability of hybridization between the polytripeptides (Pro-Pro-Gly)n, of different degrees of polymerization was investigated by gel filtrations of mixed solutions of them. Using samples selectively labeled with radioactivity, the elution pattern was detected by uv absorption and liquid scintillation counting. The hybridization was found only when the difference of polymerization is small. The amount of heterohelices (triple helices of the polypeptide chains with different degrees of polymerization) measured by integrated intensity of elution pattern was comparable to the theoretical value of Suezaki and Go. Concentration dependence of the helix-coil transition temperature of (Pro-Pro-Gly)n was also measured by the use of optical rotation and discussed with the theoretically expected values.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160203
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  • 4
    Electronic Resource
    Electronic Resource
    Fluctuations and mechanical strength of α-helices of polyglycine and poly(L-alanine) (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 2137-2153 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By using the static correlations of fluctuations in the dihedral angles of the α-helices of polyglycine and poly(L-alanine) calculated previously, geometrical fluctuations of a section (consisting of up to 18 peptide units) of the α-helices of infinite length are calculated. These fluctuations are found to differ in some respects (e.g., the dependence of amplitudes on the length of section) from those of a circular rod made of homogeneous continuous material. However, the moduli of the mechanical strengths (tensile Young's modulus, bending Young's modulus, and the shear modulus) of a circular rod are calculated, whose geometrical fluctuations are approximately equal to the fluctuations of a section consisting of 18 peptide units. They are of the order of 1011 dyn/cm2. The tensile rigidity, flexural rigidity, and torsional rigidity are calculated to be 1.20 × 10-3 dyn, 2.46 × 10-19 dyn·cm2 and 1.79 × 10-19 dyn·cm2 for polyglycine, and 1.96 × 10-3 dyn, 4.05 × 10-19 dyn·cm2 and 3.28 × 10-19 dyn·cm2 for poly(L-alanine), respectively.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360151104
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the helix-coil transition in (Pro-Pro-Gly)n by the All-or-none model (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 1927-1930 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120818
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  • 6
    Electronic Resource
    Electronic Resource
    Ultracentrifugal field relaxation behavior of fd-DNA (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 1931-1935 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120819
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  • 7
    Electronic Resource
    Electronic Resource
    The formation of the triple helix in a mixed solution of (Pro-Pro-Gly)n and (Pro-Pro-Gly)n′. A model of molecular size recognition (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 919-929 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A theoretical analysis is given of the triple-helix-random-coil transition in a mixed solution of poly(Pro-Pro-Gly)n with two different but defined degrees of polymerization n and n′. Because of the highly cooperative nature of this helix-coil transition, each polypeptide chain tends to form a triple helix with other polypeptide chains with the same degree of polymerization (size recognition). Occurrence of triple helices consisting of polypeptide chains with different degrees of polymerization (error in recognition) is studied in detail as a function of the cooperativity, and n and n′. Implication of this analysis for molecular recognition in general is discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130508
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