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  • Chemistry  (31)
  • 1
    Electronic Resource
    Electronic Resource
    Strömungsdoppelbrechung und Viskosität von Natriumcaseinatlösungen und ihre Beeinflussung durch Neutralsalz (1938)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 21 (1938), S. 315-336 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde festgestellt, dass Natriumcaseinatlösungen positive Strömungsdoppelbrechung zeigen; sie enthalten also längliche Moleklen oder Teilchen. Aus dem Verhalten des Orientierungswinkels bei Veränderung des Strömungsgefälles kann man auf Polydispersität des gelösten Caseins schliessen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19380210146
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Kenntnis des Bleiglycerats und des Bleiglätte-Glycerin-Kitts (1935)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 18 (1935), S. 759-781 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde gezeigt, dass nur eine definierte definierte Verbindung zwischen Blei und Glycerin existiert, nämlich das Glycerat C3H6O3Pb, welches beschrieben wurde.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.193501801103
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  • 3
    Electronic Resource
    Electronic Resource
    Das Lab und seine Wirkung auf das Casein der Milch. III. Entstehen bei der Labgerinnung der Milch gerinnungsaktive Stoffe? (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 854-857 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die experimentellen Grundlagen einer Arbeit von E. Baur & E. Herzfeld über die Labgerinnung der Milch als Reizleitung nachgeprüft. Es wurde festgestellt. dass nach der Labgerinnung keine labaktiven Abbauprodukte des Caseins in der Molke zu finden sind. Die beiden Autoren gelangten zu ihrem Fehlschluss, weil sie der Milchsäuregärung zu wenig Aufmerksamkeit schenkten.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330411
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  • 4
    Electronic Resource
    Electronic Resource
    Das Lab und seine Wirkung auf das Casein der Milch XIII.Untersuchung der bei der Labung in Freiheit gesetzten Peptide (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1985-1995 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a neutral sodium caseinate solution the enzyme rennin quickly sets free a number of peptides. They are found in the supernatant, when, after the action of the enzyme, the paracasein is precipitated at pH 4,7.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420629
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  • 5
    Electronic Resource
    Electronic Resource
    Das Lab und seine Wirkung auf das Casein der Milch. V. Analytische Untersuchungen an kristallisiertem Lab (1952)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 35 (1952), S. 553-560 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The crystallized rennin of N. J. Berridge was found to be not quite homogeneous at a pH of 7 in the ultracentrifuge and in diffusion measurements. An approximate molecular weight of 40,000 was calculated for the main fraction from the sedimentation and diffusion constants. The rennin behaved uniformly during paper-electrophoresis between pH 5 and 8 and at 2. The isoelectric point lies in the neighbourhood of 4,5. In conclusion, the quantitative amino acid composition was determined with the chromatographic method of Stein & Moore.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19520350220
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  • 6
    Electronic Resource
    Electronic Resource
    Über Gewinnung und Eigenschaften von humanem Globin (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1058-1070 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of a range of acid pH values on human oxy- and carboxyhemoglobin was thoroughly investigated. Above pH 4 at most a very slow conversion into hemiglobin (in the presence of O2) takes place. Denaturation sets in below pH 4 unmasking approximately 34 proton-binding groups per mole of oxyhemoglobin. Heme always appears as a cleavage product with the acid-denaturation, the cleavage becoming more and more quantitative on lowering the pH value. The split-off heme or hemin can be extracted with acetone which simultaneously precipitates the protein. After reneutralization to pH 7.3, it is soluble in water, the solubility percentage increasing with decreasing pH values of the cleavage process. The extent of renaturation which occurs on neutralization of the hydrochloric acid globin increases with increasing completeness of removal of the pigment. The cleavage velocity of oxy- and carboxyhemoglobin at various pH values was spectroscopically measured.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360517
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Vereinfachtes Verfahren zur Gewinnung von humanem Albumin und γ-Globulin aus Blutplasma mittels Alkoholfällung (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 866-873 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A modification of Cohn's Method 10 for the fractionation of citrated human plasma is described. Albumin and γ-globulin can be obtained in almost the same purity as by Methods 6 and 9, but with a simpler procedure and higher yields.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370327
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Komplexbildung zwischen α- und β-Casein und die elektrophoretische Bestimmung ihres Mengenverhältnisses in Caseinpräparaten (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 1698-1704 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der elektrophoretischen Untersuchung von Caseinatlösungen verschiedener Konzentration (0,3 bis 3,8%) findet man bei Auswertung der absteigenden Gradienten prozentual um so weniger β-Casein, je konzentrierter die Lösung ist. Dies ist weniger durch Grenzflächenanomalien als durch die reversible Komplexbildung zwischen α- und β-Casein bedingt, die in erwarteter Weise konzentrationsabhängig ist. Das gebundene β-Casein verschwindet auf den Diagrammen im α-Casein-Gradient. Interpolation der Werte auf die Konzentration gleich Null ergibt einen Maximalwert für das β-Casein von 25%. Dies dürfte dem wirklichen Gehalt des normalen Caseins entsprechen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330638
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  • 9
    Electronic Resource
    Electronic Resource
    Das Lab und seine Wirkung auf das Casein der Milch. VII. Über die Abspaltung von Nicht-Protein-Stickstoff (NPN) aus Casein durch Lab und ihre Beziehung zur Primärreaktion der Labgerinnung der Milch (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1955-1968 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: During the rennet curdling of milk, the amount of nitrogen (NPN) which is not precipitated by 12% trichloroacetic acid (TCE) increases markedly. The course of this splitting reaction can be followed quantitatively. The NPN/time curves show clearly that a very specific reaction is involved which terminates before visible clotting occurs and which differs distinctly from the slow but general proteolytic breakdown effected by the enzyme.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360735
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Intracatenare Vernetzung von Gelatine mit Carbodiimid (1972)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 55 (1972), S. 2468-2485 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Under suitable conditions it is possible to introduce into dissolved denatured gelatin molecules intracatenar cross-links. Working with 2% solutions of commercial gelatin (Mn approximately 40000) at 40° and pH 5,75 and with water-soluble carbodiimid as a condensing agent we succeeded in inserting 7-8 intracatenar amide bonds per molecule. The number of cross-links introduced was determined by the decrease of free —NH2 and —COOH groups.Using 4% solutions a gel melting point of the cross-linked preparations below 0° was obtained as compared with the gel melting point of untreated gelatin at 28°.The low viscosity and the behaviour in gel chromatography on Sepharose 6B show that the cross-linked peptide chains are fixed as rather dense coils.A small amount of the cross-linking reagent remains covalently bound to the protein, as was shown with tritium labeled carbodiimid. The side reactions possibly responsible for this occurrence are discussed. The bonds between reagent and gelatin are fairly stable at acidic pH, but labile at alkaline pH.The results of optical measurements (UV. and CD.) on cross-linked gelatin will be reported in another paper.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19720550724
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