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  • 1
    Electronic Resource
    Electronic Resource
    Heats of dilution of atactic polystyrene in ethyl acetateDedicated to Professor Dr. ICHIRO SAKURADA on his 70th birthday (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 209-216 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Verdünnungswärme und die Volumenänderung des Systems Polystyrol/Äthylacetat wurden gemessen. Es wurde gezeigt, daß die positiven Werte der enthalpischen Wechselwirkungsparameter und diejenigen des Exzeß-Volumens bei ungefähr derselben Molmasse des Polymers in negative übergehen. Dies wird erklärt mit einer drastischen Änderung der Konformation der Polymermoleküle beim Erreichen einer bestimmten Molmasse.
    Notes: The heats of dilution and the volume change for the system polystyrene/ethyl acetate were measured. It was shown that the values of the interaction heat parameter as well as those of the excess volume change their positive sign to a negative one at about the same molar mass of the polymer. This is explained in terms of drastic changes of the conformation of the polymer molecules as soon as a certain molar mass is attained.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750122
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal properties of atactic polystyrene/ethyl methyl ketone system determined by a modified differential thermal analysis (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 164 (1973), S. 349-351 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021640132
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  • 3
    Electronic Resource
    Electronic Resource
    The heats of dilution of the oligomeric ethylene oxide/alcohol solutions (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 150 (1971), S. 255-261 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021500120
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  • 4
    Electronic Resource
    Electronic Resource
    Phase equilibrium of the cellulose derivatives determined by differential thermal analysis. 1. Methylcellulose/water (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 154 (1972), S. 105-110 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein zur Vermessung von Polymeren in Lösung geeigneter DTA-Apparat wurde entwickelt. Mit Hilfe dieses Apparates wurde das Phasengleichgewicht des Systems Methylcellulose/Wasser untersucht. Aus der DTA-Kurve, die einen sigmoidalen Verlauf aufwies, wurde die Trübungstemperatur bestimmt.Die thermodynamischen Größen der Entropie, Ψ1 = 2,11, und Enthalpie, χ1 = 2,13 (bei 328,8°K), als auch die Theta-Temperatur, Θ = 59,9°C, wurden abgeschätzt.
    Notes: A DTA apparatus suïtable for measuring polymer solutions has been constructed. By using this apparatus the phase equilibrium of the system methylcellulose/water was studied. The precipitation temperature was determined from the DTA curve which shows a sigmoidal shape. The thermodynamic parameters for entropy Ψ1 = 2.11 and enthalpy, χ1 = 2.13 (at 328.8°K) and the theta temperature, Θ = 59.5°C were estimated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021540109
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of magnesium ions on helix-coil transition of DNA determined by modified differential scanning calorimeter (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 339-344 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal effect of magnesium ions on the helix-coil transition of DNA was studied calorimetrically by a modified differential scanning calorimeter (DSC). It was found that the transition temperature of DNA depends on both the DNA and magnesium ion concentrations. The dependence of the helix-coil transition of DNA on the mole ratio of magnesium ions to DNA(P) can be classified into two groups. When this mole ratio is less than 1, magnesium ions tend to stabilize the double-helix DNA, so that the transition temperature increases linearly and the heat of transition increases significantly with increasing mole ratio. When the mole ratio is more than 1, magnesium ions tend to destabilize the double-helix DNA, so that DNA precipitates when the temperature is raised above the transition temperature. In this case, both the transition temperature and the heat of transition decrease with increasing mole ratio.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130209
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental verification of effects of conditions of precipitational fractionation on molecular weight distribution of the first fraction by atactic polystyrene/methylcyclohexane system (1970)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 135 (1970), S. 23-33 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß der Anfangskonzentration und der Menge der Fraktion auf die Molekulargewichtsverteilung wurde bei ataktischem Polystyrol in Methylcyclohexan als Lösungsmittel untersucht. Die Phasentrennung wurde durch Temperatureniedrigung der verdünnten Lösung hervorgerufen. Es wurde eine konstante Menge (etwa 1/9 des Gewichts des gelösten Polymeren) als erste Fraktion aus Lösungen mit verschiedener Anfangskonzentration im Bereich von 0,1 bis 2,0% ausgefällt. Außerdem wurde die Menge der ersten Fraktion von 1/2 bis 1/5 des Polymeren für konstante Konzentrationen (1,0 und 2.0%) variiert. Die so erhaltene Molekulargewichtsverteilung der Fraktion wurde durch Gelchromatographie bestimmt. Es wurde geschlossen, daß die Molekulargewichtsverteilung der erster. Fraktion, die durch eine einfache Ausfällungsmethode erhalten wird, um so enger ist, je geringer die Anfangskonzentration ist, und daß die Breite der Molekulargewichtsverteilung mit fallender Menge der Fraktion zunimmt, sobald diese geringer ist als die Halfte des gesamten Polymeren. Diese Beobachtungen befinden sich in ziemlich guter übereinstimmung mit den theoretischen Voraussagen, die aus den hypothetischen Fraktionierungen in den früheren Veröffentlichungen abgeleitet wurden.
    Notes: Effects of the initial concentration and the amount of the fraction on the molecular weight distribution (mol. wt. distr.) of the fraction were examined on atactic polystyrene in methylcyclohexane. The phase separation was caused by lowering the temperature of the dilute solution. A constant amount (about 1/9 in weight of the total polymer dissolved) of the first fraction was precipitated from solutions of various initial concentrations ranging from 0.1 to 2.0%. In addition, the amount of the first fraction was varied from 1/2 to 1/5 for constant concentrations (1.0 and 2.0%). The mol. wt. distr. of the fraction thus obtained was determined by the gel permeation chromatography. It is concluded that the mol. wt. distr. of the first fraction obtained by a simple precipitational method becomes narrower as the initial concentration is lower, while the breadth of the mol. wt. distr. of the fraction increases with decreasing the amount of the fraction, if it is less than half of the total polymer. These observations are in fairly good accord with the theoretical predictions deduced from the hypothetical fractionations in the previous papers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1970.021350103
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  • 7
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    Cellular DNA synthesis in productive infection with adenoviruses (1970)
    Wiley
    Details
    Publication Date: 1970-11-15
    Print ISSN: 0020-7136
    Electronic ISSN: 1097-0215
    Topics: Biology , Medicine
    Published by Wiley
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