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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 17628-17631 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 772-773 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fraction Mol. wt. x 10-6 Table 1 A2 x 10-4 Melting Precipitation point cm3 g~2 mole point ( C) ( C) Iso-octane Hexane 1 3 5 7 8 Kesidue* 1-34 1-18 1-37 1-13 1-00 1-13 -1-75 0-31 0-45 1-43 2-31 4-01 62 56 48 55 50 46 42 38 34 " Less the fraction of lowest molecular weight. ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 235 (1969), S. 1196-1200 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Aggregationszahlen für Mizellen von Tetradecyltrimethylammoniumbromid und Tetradecyltrimethylammoniumsulfat in Wasser und verdünnten Salzlösungen wurden durch Lichtstreuungsmessungen ermittelt. Verschiedene Berechnungsmethoden wurden miteinander verglichen. Die Aggregationszahlen im System Tetradecyl-trimethylammoniumbromid/Natriumsulfat deuten darauf hin, daß die Mizellen von der gleichen Größe sind wie die, wenn nur Sulfatgegenionen in der Lösung vorhanden sind, selbst wenn die Sulfationenkonzentration nur die Hälfte der Bromidionenkonzentration beträgt.
    Notes: Summary The micelle aggregation numbers of micelles formed from tetradecyltrimethylammonium bromide and sulphate in water and dilute salt solutions have been measured by light scattering. A comparison is made between several different methods of calculating the results. Aggregation numbers of micelles formed when sodium sulphate is added to tetradecyltrimethylammonium bromide indicate that the micelles are the same size as those formed when only sulphate gegenions are present in solution even at a sulphate ion concentration of less than half the bromide ion concentration.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 256 (1978), S. 392-392 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 685-687 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The conductances of aqueous solutions of the calcium salt of N-acetyl-neuraminic acid (NANA) an important constituent of glycolipids and glycoproteins have been measured over a range of temperature. The data are consistent with the formation of the Ca (NANA)+ ion-pair. Dissociation constants and thermodynamic parameters for the ion-pair have been derived.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The journal of membrane biology 21 (1975), S. 1-10 
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Thed-glucose permeabilities of bimolecular lipid membranes formed from egg lecithin, cholesterol and human erythrocyte membrane fractions obtained using several fractionation procedures have been measured in order to assess their monosaccharide transport activity. The electrical properties of the bilayers containing the membrane fractions have also been measured and the bilayer thicknesses calculated. The observedd-glucose permeability coeffcients are several orders of magnitude lower than that of the human erythrocyte membrane, indicating that none of the membrane fractions possessed significant glucose carrier activity. It is concluded that more refined techniques for incorporating membrane fractions into BLMs will be necessary before the monosaccharide transport system can be simulatedin vitro.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 230 (1969), S. 236-240 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary An equation is derived on the basis of theGouy-Chapman theory relating the double layer potential, surface charge density and electrolyte concentration in a liquid film stabilised by an ionic surfactant. The validity of the constant potential model for a soap film is shown to be inconsistent with known properties of films, monolayers and micelles, and it is suggested that a constant surface charge density model is more realistic.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 251 (1973), S. 343-347 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die relativen molaren thermodynamischen Partialfunktionen $$\overline {\Delta \mu } _1 $$ , $$\overline {\Delta S} _1 $$ andΔS 1wurden abgeleitet aus Literaturwerten von Lichtstreuungsmessungen und kalorimetrischen Untersuchungen an mizellaren Lösungen vonn-Dodecyltrimethylammoniumbromid. Es wird gezeigt, daß die Zahlenwerte der thermodynamischen Funktionen erheblich größer sind als von der Wechselwirkung der elektrischen Doppelschichten zu erwarten ist, die die Mizellen umgeben. Mögliche Enthalpieänderungen, die sich aus Änderungen von Größe, Gestalt und Dissoziationsgrad bei Verdünnung herleiten, werden diskutiert.
    Notes: Summary The relative partial molal thermodynamic functionsΔμ 1 $$\overline {\Delta {\rm H}} _1 $$ and $$\overline {\Delta S} _1 $$ have been derived from reported experimental light scattering and calorimetric measurements on micellar solutions ofn-dodecyltrimethylammonium bromide. It is shown that the magnitudes of the thermodynamic functions are considerably larger than can be accounted for by the interaction of the electrical double layers surrounding the micelles. Possible enthalpy changes arising from a change in micelle shape, size and degree of dissociation on dilution are discussed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 1435-1450 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dissociation of beef liver and bacterial (Micrococcus lysodeikticus) catalases by the action of sodium n-dodecyl sulfate (SDS) has been investigated as a function of SDS concetration and time by ultracentrifugation. The rate of dissociation of beef liver catalase is found to be much faster than that for bacterial catalase in 25 mM SDS at pH 7.0. Beef liver catalase is dissociated into its four subunits after 24 h, whereas bacterial catalase is not completely dissociated after 36 days of incubation. The binding of SDS to beef liver catalase obeys a Hill equation with a cooperativity exponent of 2.0 and a binding constant of 440. The initial interaction of SDS with beef liver catalase can be detected by microcalorimetry, whereas the mixing of SDS with bacterial catalase is athermal. Bacterial catalase retains enzymic activity in the presence of SDS, whereas beef liver catalase is completely deactivated at SDS concentrations above 5 mM. Beef liver catalase is more sensitive to acid denaturation than bacterial catalase, and the rate of dissociation for both catalases is sixth-order in proton concentration. Comparison of the amino acid analysis of the two catalases shows that bacterial catalase has a smaller number of lysyl residues and a larger number of glutamyl residues than beef liver catalase. Taken together these structural differences could lead to a reduced affinity of bacterial catalase for the binding of SDS as observed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A sedimentation analysis has been used to determine the proportion of protein present as monomer and aggregate in 0.5 and 1.0 g/dl solutions of β-casein A in pH 7 phosphate buffer over the temperature range 10-40°C. The amount and molecular weight of the aggregate increase with temperature; under the conditions used, the aggregation number (n) of β-casein is given approximately by n = 0.6t + 2 with t in degrees centigrade. The concentration of β-casein in monomeric and aggregated states at different temperatures is used to calculate the standard enthalpy of aggregation ΔH° (Van't Hoff) by assuming that β-casein undergoes a cooperative, two-state, micellization process; aggregation is an endothermic process and ΔH° = 66.0 ± 2.6 kJ mol-1. Combination of this ΔH° with the amount of protein calculated to dissociate when 1 g/dl solutions are diluted isothermally to 0.5 g/dl gives the heat of dilution at various temperatures. These calculated heats of dilution are compared with the experimental values obtained by carrying out the same dilutions in a microcalorimeter. The heat of dilution decreases linearly with β-casein concentration, but the extrapolated zero-concentration values of 65.8 ± 1.6 kJ mol-1 is the same as the Van't Hoff enthalpy. This agreement in the enthalpy values indicates that the micellization of β-casein occurs cooperatively. The effect of modifying the hydrophobic/hydrophilic balance of the system on the micellization of β-casein A has been investigated. The hydrophobic interaction between the protein molecules is decreased by removing the three C-terminal residues (Ileu Ileu Val) with carboxypeptidase-A. This modification drastically reduces the ability of the β-casein molecule to form micelles. Substitution of 2H2O for H2O at constant temperature perturbs the monomer-micelle equilibrium in favor of micelles because of enhanced hydrophobic interactions in the former solvent. The results are consistent with β-casein micellization involving a delicate balance of the hydrophobic forces favoring aggregation and electrostatic forces opposing it.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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