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  • 1995-1999  (3)
  • 1990-1994  (2)
  • Chemistry  (2)
  • antiradical activity  (2)
  • bile acids  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 251-254 
    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: Untersuchung der Spannungs-Dehnungs-Beziehungen von anfänglich anisotropen Metallen unter den Bedingungen proportionaler und nicht proportionaler BelastungFür praktische Berechnungen basiert die Plastizitätstheorie üblicherweise auf der Annahme der Materialisotropie. Handelsübliche metallische Werkstoffe sind jedoch i.a. anisotrop infolge vorhergehender thermischer und/oder mechanischer Vorbehandlungen.Aluminium-, Titan- und Magnesiumlegierungen sind typische strukturanisotrope Werkstoffe. Deren breite Anwendung in vielen ingenieurtechnischen Bereichen erfordert jedoch eine genauere Bestimmung der mechanischen Eigenschaften unter verschiedenen typischen Belastungsbedingungen.In der vorliegenden Arbeit wird eine einfache Theorie für anisotrope Metalle vorgestellt, die auf Experimenten zur elastischplastischen Verformung ursprünglich anisotroper Metalle unter einfacher (proportionaler) Belastung sowie für den Spezialfall einer Belastung entlang eines unstetigen Spannungsweges beruht.
    Notes: In plasticity theories-applied in practical calculations- are usually based on the assumption of materials isotropy.Commercially obtained structural metallic materials however are originally anisotropic due to various kinds of thermal and mechanical treatments.Aluminium, titanium and magnesium alloys are typical anisotropic structural materials. The wide application of these materials in different fields of engineering demands more accurate mechanical behaviour predictions for these alloys under various conditions of loadings.In the aper, a simple theory of plasticity for anisotropic metals is proposed which is based on the results of experimental investigations into elasto-plastic deformation of initially anisotropic aluminium alloys subjected to simple (proportional) loading as well as under loading along stress path with a corner.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-8221
    Keywords: antioxidants ; hepatocytes in culture ; bile acids ; high-density lipoproteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-8221
    Keywords: human heart ; age ; ischemia ; lipid peroxidation ; antiradical activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Levels of lipoperoxides and hydrophobic scavengers of free radicals were estimated in n-hexane extracts of myocardial biopsy specimens taken from cardiac patients (children and adults) during surgical operations. Ultraviolet spectra of these extracts were found to contain four absorption bands with peaks at 214, 233, 258, and 298 nm that characterize the levels of diene and triene conjugates. A comparison of the data obtained for children and adults suggested that the total antiradical activity of the cardiac muscle decreases while its content of vitamin E remains virtually unchanged during ontogeny. Significantly reduced vitamin E levels were noted in specimens from patients with chronic ischemic heart disease.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-8221
    Keywords: ternary copolymers ; antiradical activity ; antimutagenesis ; hindered phenols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ternary copolymers of the diallyl series were tested for antiradical activity against the stable radical 1,1-diphenyl-2-picrylhydrazyl, and the numbers of active antitradical fragments which are present in their macromolecules and which may participate in the free-radical reactions induced by gamma radiation in living organisms were estimated. A correlation was found between the antiradical activity of ternary copolymers and their ability to protect barley seedling roots from mutagenic effects of gamma radiation.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0952-3499
    Keywords: Sequence-specific photomodification ; Oligonucleotide derivatives ; Ethidium ; Azidoethidium ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Oligodeoxyribonucleotide derivatives containing ethidium or azidoethidium residues attached to 3′ and/or 5′ end were prepared. These derivatives formed tight specific complexes with complementary oligodeoxyribonucleotides where each attached ethidium residue led to an increase of complex Tm by 20-30°C. Tandem complexes of two oligodeoxyribonucleotides containing ethidium residues with an oligodeoxyribonucleotide having two adjacent complementary sequences for these Oligonucleotide were investigated. Photoinduced reactions of a number of ethidium and azidoethidium oligodeoxyribonucleotide derivatives with target complementary single-stranded and double-stranded oligo- and polydeoxyribonucleotides were investigated. The irradiation led to direct photocleavage of the target oligo- or polynucleotide, to formation of hidden (piperidine cleavable) modifications of the target of formation of covalent adducts between ethidium oligodeoxyribonucleotide derivative and the target. In a number of experiments, azidoethidium dyes were demonstrated to be considerably stronger photosensitizers than ethidium ones. Depending on the nature of the target (single- or double-stranded DNA) and on the irradiation conditions, the total damages to the target oligo- or polydeoxyribonucleotides ranged from 10-70% (for ethidium dyes) to 30-80% (for azidoethidium dyes).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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