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  • Chemistry  (33,077)
  • LUNAR AND PLANETARY EXPLORATION  (3,679)
  • 1975-1979  (33,097)
  • 1945-1949  (3,659)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 23 (1977), S. 39-44 
    ISSN: 1432-0827
    Keywords: Dental cementum ; Collagen ; Protein ; Chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Cyanogen bromide (CNBr) peptides were prepared of the insoluble collagen of bovine dental cementum. Following chromatographic separation, the peptides were identified by their amino-acid composition. Type I collagen ([α1(I)]2α2) accounted for more than 90% of the organic matrix, while Type III collagen ([α1(III)]3) was present at a level of approximately 5%. Amino-acid analyses revealed that the CNBr peptides from α1(I) and α2 chains of cementum closely resembled the corresponding peptides from calf skin. The only systematic difference was a higher level of hydroxylation of prolyl and lysyl residues of the cementum peptides.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 23 (1977), S. 87-94 
    ISSN: 1432-0827
    Keywords: Calcium ; Osteoporosis ; Lactation ; Chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The calcium homeostatic mechanism was challenged in adult female rats by feeding them a calcium-deficient diet containing oxalate, and by subjecting them to pregnancy and lactation. The regimen caused a substantial weight loss, especially in those animals which reared their young well. Severe hypocalcaemia was observed in the lactating rats. Serum-P was slightly elevated. The content of hydroxyproline in serum was considerably elevated, reflecting the degree of calcium deprivation. Serum proteins were least influenced. The calcium depriving regimen reduced the growth of long bones, but did not stop it. The ash content of the bones was considerably reduced, the degree of reduction depended on the degree of calcium deprivation. Ash as percentage of total bone organ was reduced, but not to the same extent as total ash. Analyses of different parts of femur showed that the proximal and distal parts had lost more bone mineral than the diaphyseal shaft. The ash content of cortical bone tissue from the femur was estimated by a volumetric method. No differences were observed between test groups and controls, indicating that no measurable amounts of bone mineral had been removed from the walls of the vascular canals or by osteocytic osteolysis. Planimetric determinations on cross sections from femora disclosed that a great amount of bone had been removed from the endosteal surface of the diaphysis, while the periosteal surface demonstrated reduced bone apposition.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 23 (1977), S. 13-17 
    ISSN: 1432-0827
    Keywords: Dental calculus ; Glycopeptide ; Chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary A method is described for the isolation and purification of a sulphated glycopeptide from human supragingival calculus. The compound was isolated after using EDTA treatment, 2 M CaCl2 extraction, proteolytic digestion, ethanol precipitation, and finally purified by DEAE cellulose chromatography. It migrated as a single component on cellulose acetate electrophoresis, and chemical and infrared spectral analysis showed the presence of covalently attached sulphate groups. The sulphated glycopeptide was distinguished from being a sulphated glycosaminoglycan.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 35-35 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Stress Intensity Factors in the Neighbourhood of a Circular Hole and their Influence on Crack Behavior.A photoelastic method was developed to determine the stress intensity factors KI and KII for cracks subjected to mixed-mode loading. The constants in the near field expansion about the crack tip were computed using a non-linear optimization program to give a best fit to the observed isochromatics. Copying the latter onto an equal density film increased their sharpness and, thus, the accuracy of the determination. The method was applied to cracks lying perpendicular to the external stress near a circular hole in a plate under uniaxial tension and the results used to describe the paths of cracks in the neighbourhood of a hole.
    Notes: Es wurden Modellexperimente durchgeführt, um den Einfluß von Inhomogenitäten - wie etwa Poren oder Einschlüsse - auf das Bruchverhalten unter statischer Belastung zu untersuchen. Änderungen der Ausbreitungsrichtung eines Risses, verursacht durch die Wechselwirkung mit einem Kreisloch in einer einachsig belasteten Platte, wurden gemessen. Zum Verständnis der beobachteten Abweichungen wurden die Spannungsfaktoren KI und KII eines Risses in der Nähe eines Kreisloches in einer Platte spannungsoptisch bestimmt. Hierzu wurden die Isochromaten um eine Rißspitze durch Verwendung eines Äquidensitenfilmes photographisch verschärft und die erhaltenen Linien durch ein nicht-lineares Optimierungsprogramm an die Nahfeld-Lösung der Spannungsverteilung um eine Rißspitze angepaßt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Experience with Water Heaters of Stainless Steel.Different stainless steels and their importance in the construction of domestic water heaters. Types of corrosion and their importance in water heating practice. Important aspects for manufacture. Experience gained with stainless steel water heaters.
    Notes: Die verschiedenen nichrtrostenden Stähle und ihre Bedeutung für den Bau von Warmwasserbereitern. Korrosionsarten bei nichtrostenden Stählen und ihre Bedeutung im Zusammenhang mit der Warmwasserbereitung. Wichtige Gesichtspunkte für die Fertigung. Bisherige praktische Erfahrungen mit Warmwasserbereitern aus nichtrostendem Stahl.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 70-72 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975) 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 95-108 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Concerning Investigation of Internal Electrodeposition Stress and Residual Internal Stress in Electrodeposited Nickel Coatings by Spiral Contractometer and “Strip Dilatometer” Methods.For assessing the affect of material and plating conditions on internal stress in electrodeposited coatings and its influence on material strength of plated parts it is better knowing internal stress in thin, just deposited layers (while plating process continuous) and also the course of internal stress in the coating (after plating has been finished) instead of investigating an average stress in the coating. In order to get this more substantial information on internal stresses in electrodeposited coatings a deposition model - gradual composition of the coating - and stress calculation methods were developed for Spiral Contractometer and “Strip Dilatometer”. Both methods were applied on measurements in a Watts-Nickel electrolyte.
    Notes: Für die Beurteilung werkstoff- und abscheidungsbedingter Eigenspannungszustände in galvanischen Schichten und ihres Einflusses auf Festigkeitseigenschaften beschichteter Bauteile ist es vorteilhaft, statt der mittleren Schichteigenspannungen erstens kontinuierlich über dem Schichtwachstum die Eigenspannungen dünner Schichtinkremente zu ermitteln und zweitens den Verlauf der - nach beendeter Abscheidung - tatsächlich über der Schichtdicke wirkenden Eigenspannungen zu bestimmen. Um diese differenzierte Aussage über Eigenspannungen in galvanischen Schichten zu erhalten, wurden anhand eines Abscheidungsmodells - schrittweiser Aufbau der Schicht - Rechenverfahren für Messungen mit dem Spiralkontraktometer und dem Streifendehnungsmeßgerät entwickelt und an Nickelschichten aus dem Watts-Bad praktisch erprobt.
    Additional Material: 9 Ill.
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