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  • 1975-1979  (23)
  • 1965-1969
  • 1950-1954
  • 1935-1939
  • 1976  (23)
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  • 1975-1979  (23)
  • 1965-1969
  • 1950-1954
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of C-glycosyl thiazoles (1976)
    s.l. : American Chemical Society
    The @journal of organic chemistry 41 (1976), S. 4074-4077 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00888a005
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of angiotensin II antagonists containing N- and O-methylated and other amino acid residues (1976)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 19 (1976), S. 244-250 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00224a009
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  • 3
    Electronic Resource
    Electronic Resource
    β Structure of aqueous staphylococcal enterotoxin B by spectropolarimetry and sequence-based conformational predictions (1976)
    s.l. : American Chemical Society
    Biochemistry 15 (1976), S. 4666-4671 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00666a019
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  • 4
    Electronic Resource
    Electronic Resource
    Structures of modified cardenolides. 1. Lactam analogs of isodigitoxigenin (1976)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 98 (1976), S. 6308-6312 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00436a039
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  • 5
    Electronic Resource
    Electronic Resource
    CHRONIC ALCOHOL INGESTION: EFFECTS ON WATER METABOLISM (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 273 (1976), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1976.tb52898.x
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  • 6
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    Unknown
    Sobre la existencia de encostramientos ferruginosos en la rasa occidental asturiana (1976)
    Madrid : Periodicals Archive Online (PAO)
    Estudios geográficos. 37:145 (1976:nov.) 497 
    Details
    ISSN: 0014-1496
    Topics: Geography
    Notes: NOTICIAS Y COMENTARIOS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6094-1976-037-45-000010
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  • 7
    Electronic Resource
    Electronic Resource
    Membrane adenosine triphosphatase of Micrococcus lysodeikticus. Isolation of two forms of the enzyme complex and correlation between enzymatic stability, latency and activity. (1976)
    Springer
    Molecular and cellular biochemistry 10 (1976), S. 67-76 
    Details
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Two new forms of the plasma membrane ATP-ase ofMicrococcus lysodeikticus NCTC 2665 were isolated from a sub-strain of the microorganism by polyacrylamide gel electrophoresis. One of them had a mol.wt of 368,000 and a very low specific activity (0.80 µ mol.min−1.mg protein−1) that could not be stimulated by trypsin. This form has been called BI (strain B, inactive). If the electrophoresis was carried out in the presence of reducing agents (i.e., dithiothreitol) and the pH of the effluent maintained at a value of 8.5 another form of the enzyme was obtained. This had a mol.wt of 385,000 and a specific activity of 2.5–5.0 µ mol.min−1.mg protein−1 that could be stimulated by trypsin to 5–10 µ mol.min−1.mg protein−1. This preparation of the ATPase has been called form BA (strain B, enzyme active). The subunit composition of both forms has been studied by sodium dodecyl sulphate and urea gel electrophoresis and compared to that of the enzyme previously purified from the original strain (form A). The three forms of the enzyme had similarβ and δ subunits, with mol.wt of about 50,000 and 30,000 dalton, respectively. They also had in common the component(s) of relative mobility 1.0, whose status as true subunit(s) of the enzyme remains yet to be established. However, subunitα, that had a mol.wt of about a 52,500 in form A (Andreu et al. Eur. J. Biochem. (1973) 37, 505–515), had a mol.wt similar toβ in form BI and about 60,000 in form BA. Furthermore BA usually showed two types of this subunit (α′ andα′′) and an additional peptide chain (ε) with a mol.wt of about 25,000 dalton. This latter subunit seemed to account for the stimulation by trypsin of form BA. Forms BA could be converted to BI by storage and freezing and thawing. Conventional protease activity could not be detected in any of the purified ATPase forms and addition of protease inhibitors to form BA failed to prevent its conversion to form BI. The low activity form (BI) was more stable than the active forms of the enzyme and also differed in its circular dichroism. These results show thatM. lysodeikticus ATPase can be isolated in several forms. Although these variations may be artifacts caused by the purification procedures, they provide model systems for understanding the structural and functional relationships of the enzyme and for drawing some speculations about its functionin vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01742200
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  • 8
    Electronic Resource
    Electronic Resource
    Solution polymerization of 1,3,5-trioxane and 1,3,5,7-tetroxocane, 1. Rate of polymerization, characterization and melting behaviour of as-polymerized poly(oxymethylene) (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2149-2168 
    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 Beziehung zwischen Polymerisationsgeschwindigkeit und Struktur der während der Polymerisation entstehenden Polymerkristalle wurde für die kationische Polymerisation von 1,3,5-Trioxan und 1,3,5,7-Tetroxocan („Tetroxan“) in Lösung untersucht. Es wurden folgende Monomer/Lösungsmittel Paare gewählt : Tetroxan/Nitrobenzol (I), Tetroxan/l,2-Dichloräthan (II), 1,3,5-Trioxan/chloriertes Paraffin (III) und 1,3,5-Trioxan/n-Paraffin (IV). Das in allen Fällen hergestellte Poly(oxymethylen), (POM), wurde nach Molekulargewicht, Röntgenkristallinität und dem Schmelzverhalten mit Hilfe der Differentialkalorimetrie, (DSC), charakterisiert. Für die Systeme I und II, wo die Polymerisationsgeschwindigkeit sehr groß war, wurde auf Grund der mit DSC erhaltenen Ergebnisse eine aus gefalteten Ketten bestehende Struktur gefunden. Bei höherem Umsatz im System II weist das Schmelzverhalten von POM jedoch auf eine gestreckt-kettige Struktur hin. Für die Systeme III und IV, wo die Polymerisationsgeschwindigkeit sehr langsam verläuft, kann aus den DSC-Ergebnissen in beiden Systemen aufzwei Kristallstrukturen geschlossen werden. Eine davon kann auf Grund der Überhitzungserscheinungen und auf Grund von Tempereffekten gestreckt-kettiges POM darstellen. Die andere Kristallstruktur zeigt kein eindeutiges Schmelzverhalten, weshalb aus den DSC-Ergebnissen allein die Struktur nicht zu bestimmen ist.
    Notes: A relationship between the rate of polymerization and the structure of the as-polymerized crystals is investigated in the cationic polymerization in solution of 1,3,5-trioxane and 1,3,5,7-tetroxocane. The monomer/solvent reaction systems chosen were: 1,3,5,7-tetroxocane/nitrobenzene (I); 1,3,5,7-tetroxocane/l,2-dichloroethane (II), 1,3,5-trioxane/chlorinated parafin (III), and 1,3,5,7-trioxane/normal paraffin (IV). The poly(oxymethylene), (POM), obtained in each case was characterized as to molecular weight, X-ray cristallinity and by differential scanning calorimetry (DSC). The data from the DSC curves indicated a folded chain structure for systems I and II, where the rate pf polymerization was very high. However in system II at high polymer conversion a fraction of POM appears with a melting behaviour characteristic of an extended chain structure. For systems III and IV, where the rate of polymerization was very low, the DSC curves indicated the presence of two crystal forms. One of these forms shows a clear response to overheating and annealing treatments, which indicates the presence of an extended chain structure. The second form shows ambiguous melting behaviour and by thermal data alone it is impossible to determine its structure.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770719
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  • 9
    Electronic Resource
    Electronic Resource
    Solution polymerization of 1,3,5-trioxane and 1,3,5,7-tetroxocane, 2.Part 1: cf.3. Morphology of the as-polymerized poly(oxymethylene) crystals (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2169-2184 
    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 Morphologie von Poly(oxymethylen), (POM), Kristallen, die aus verschiedenen Monomer/Lösungsmittel Polymerisationsystemen hergestellt worden waren, wurden mittels Elektronenmikroskopie untersucht. Die aus 1,3,5,7-Tetroxocan („Tetroxan“) in Nitrobenzol entstehenden POM Kristalle zeigen eine lamellare Morphologie mit undefinierter hexagonaler Form. Andererseits wurden neue rhombische POM Kristalle bei der Polymerisation von Tetroxan in 1,2-Dichloräthan erhalten. Beide Kristallarten zeigen wahrscheinlich eine Struktur mit gefalteten Ketten. Federartige Kristalle mit seitlich fibrillärem Wachstum wurden bei der Polymerisation von 1,3,5-Trioxan in n-Paraffin gefunden. Eine große Zahl von Kristallen verschiedener Morphologien wurde bei der Polymerisation von 1,3,5-Trioxan in chloriertem Parafin erhalten, die in zwei hauptsächliche Gruppen eingeteilt werden können: Eine Gruppe besteht aus veränderten federartigen Kristallen, während die andere mehr geometrisch dreieckige und rhombisch geformte Plättchen umfaßt. Alle diese Kristalle zeigen seitliches fibrilläres Wachstum, so daß am Ende der Polymerisation eine übenviegend fibrilläre Morphologie zu beobachten ist. Es wird angenommen, daß alle diese Kristalle eine gestrecktkettige Struktur aufweisen.
    Notes: The morphology of poly(oxymethylene), (POM), crystals obtained from different monomer/solvent polymerization systems was studied by means of electron microscope techniques. POM obtained from 1,3,5,7-tetroxocane in nitrobenzene had an irregular hexagonoidal shaped lamellar morphology, while rhombic POM crystals were obtained from the polymerization of 1,3,5,7-tetroxocane in 1,2-dichloroethane. Both types of crystals probably have a folded chain structure. POM obtained from 1,3,5-trioxane in normal (unbranched) paraffin represented the feather-like crystals with proliferating lateral growths. POM obtained from 1,3,5-trioxane in chlorinated paraffin presented numerous crystals of different morphologies. Two main groups could be discerned: one consisted of variations of the basic feather-like crystal, while the other comprised more geometrically triangular and orthorhombic morphologies. All these crystals presented lateral growths, and toward the end of the polymerization a fibrous morphology prevailed. Evidence points to their being crystals of an extended chain structure.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770720
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  • 10
    Electronic Resource
    Electronic Resource
    A study of wood-plastic combinations based on low-density woods (1976)
    Springer
    Journal of materials science 11 (1976), S. 1711-1724 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Six low-density tropical woods were impregnated with various vinyl monomers and polymerized by irradiation with a60Co source. The wood-plastic combinations were subjected to standard tests of mechanical properties, and their fracture surfaces were studied by scanning electron microscopy. It was found that, even though most mechanical properties are enchanced by addition of plastics, the properties of wood-plastic combinations fall below those of high-density natural woods on a per unit weight basis. The direct observation of fracture surfaces gave indications of non-uniform penetration of the plastic and little bonding between the polymer and cellulose fibres. Although the wood-plastic combinations produced by the present methods may not be recommendable for applications where increased strength is desired on the basis of cost/ quality considerations, they may be suitable for uses where increased abrasion resistance, dimensional stability and lower anisotropy of compressional properties are primary considerations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00737527
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