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  • 1
    Electronic Resource
    Electronic Resource
    Cu-EPR in YBa2Cu3O6+δ single crystals (1994)
    Springer
    The European physical journal 93 (1994), S. 407-409 
    Details
    ISSN: 1434-6036
    Keywords: 76.30.-V ; 74.70.Vy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the observation of Cu-EPR signals in single crystalline material of YBa2Cu3O6+δ in the narrow oxygen concentration range 0.7〈δ〈0.9 and for temperatures 80 K〈T〈200 K. We provide evidence that the signal results from Cu2+ ions located in ⋯Cu(1)⋯O⋯Cu(1)⋯ chain fragments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314242
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of palmitoylcarnitine on mitochondrial activities (1995)
    Springer
    Planta 196 (1995), S. 720-726 
    Details
    ISSN: 1432-2048
    Keywords: β-Oxidation ; Mitochondrion ; Palmitoylcarnitine ; Pisum ; Solanum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mitochondria from pea (Pisum sativum L.) cotyledons and potato (Solanum tuberosum L.) tubers exhibited a palmitoyl carnitine-dependent, KCN-sensitive stimulation of the oxygen uptake measured in the presence of 0.2mmol·−1 malate (sparker malate), provided a certain concentration range of palmitoylcarnitine was observed. Above this concentration range, which was dependent on the bovine serum albumin (BSA) concentration of the reaction mixture, the mitochondrial oxygen uptake was inhibited by palmitoylcarnitine. Palmitoylcarnitine (racemate) and palmitoyl-l-carnitine were equally effective in stimulating/inhibiting mitochondrial oxygen uptake in the presence of sparker malate. The mitochondrial membrane potential generated in the presence of sparker malate was partially dissipated by palmitoyl-lcarnitine concentrations stimulating the mitochondrial oxygen uptake. The formation of acid-soluble radioactivity in reaction mixtures provided with [1-14C]palmitoyll-carnitine was considerably lower than that expected minimally if the palmitoyl-l-carnitine-stimulated oxygen uptake resulted from palmitoyl-l-carnitine oxidation sparked by malate. Palmitoylcarnitine concentrations resulting in stimulation of the mitochondrial oxygen uptake in the presence of sparker malate also led to a stimulation of succinate-cytochrome c reductase activity, as well as to an increase in the measurable activities of mitochondrial matrix enzymes, indicating loss of both mitochondrial integrity and mitochondrial enzyme latency in the presence of palmitoylcarnitine. Correspondingly, malate-dependent NADH formation was stimulated by palmitoylcarnitine. Neither NAD reduction nor oxygen uptake were observed when the mitochondria were provided with palmitoylcarnitine only. The oxygen uptake due to glycine oxidation by mitochondria from green sunflower (Helianthus annuus L.) cotyledons was affected by palmitoylcarnitine in a similar manner to the oxygen uptake of pea cotyledon and potato tuber mitochondria in the presence of sparker malate. The results lead to the conclusion that the palmitoylcarnitine-dependent stimulation of mitochondrial oxygen uptake observed in the presence of sparker malate results substantially from an enhanced malate oxidation due to the detergent effect of palmitoylcarnitine on the mitochondrial membranes, rather than from palmitoylcarnitine β-oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197337
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of palmitoylcarnitine on mitochondrial activities (1995)
    Springer
    Planta 196 (1995), S. 720-726 
    Details
    ISSN: 1432-2048
    Keywords: β-Oxidation ; Mitochondrion ; Palmitoylcarnitine ; Pisum ; Solanum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mitochondria from pea (Pisum sativum L.) cotyledons and potato (Solanum tuberosum L.) tubers exhibited a palmitoyl carnitine-dependent, KCN-sensitive stimulation of the oxygen uptake measured in the presence of 0.2mmol·−1 malate (sparker malate), provided a certain concentration range of palmitoylcarnitine was observed. Above this concentration range, which was dependent on the bovine serum albumin (BSA) concentration of the reaction mixture, the mitochondrial oxygen uptake was inhibited by palmitoylcarnitine. Palmitoylcarnitine (racemate) and palmitoyl-l-carnitine were equally effective in stimulating/inhibiting mitochondrial oxygen uptake in the presence of sparker malate. The mitochondrial membrane potential generated in the presence of sparker malate was partially dissipated by palmitoyl-lcarnitine concentrations stimulating the mitochondrial oxygen uptake. The formation of acid-soluble radioactivity in reaction mixtures provided with [1-14C]palmitoyll-carnitine was considerably lower than that expected minimally if the palmitoyl-l-carnitine-stimulated oxygen uptake resulted from palmitoyl-l-carnitine oxidation sparked by malate. Palmitoylcarnitine concentrations resulting in stimulation of the mitochondrial oxygen uptake in the presence of sparker malate also led to a stimulation of succinate-cytochromec reductase activity, as well as to an increase in the measurable activities of mitochondrial matrix enzymes, indicating loss of both mitochondrial integrity and mitochondrial enzyme latency in the presence of palmitoylcarnitine. Correspondingly, malate-dependent NADH formation was stimulated by palmitoylcarnitine. Neither NAD reduction nor oxygen uptake were observed when the mitochondria were provided with palmitoylcarnitine only. The oxygen uptake due to glycine oxidation by mitochondria from green sunflower (Helianthus annuus L.) cotyledons was affected by palmitoylcarnitine in a similar manner to the oxygen uptake of pea cotyledon and potato tuber mitochondria in the presence of sparker malate. The results lead to the conclusion that the palmitoylcarnitine-dependent stimulation of mitochondrial oxygen uptake observed in the presence of sparker malate results substantially from an enhanced malate oxidation due to the detergent effect of palmitoylcarnitine on the mitochondrial membranes, rather than from palmitoylcarnitine β-oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106766
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  • 4
    Electronic Resource
    Electronic Resource
    134. Beschreibung von Eigenschaften fluider Mischungen mit kubischen Zustandsgleichungen - Kritische Analyse klassischer und moderner Mischungsregeln (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1239-1239 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306609135
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  • 5
    Electronic Resource
    Electronic Resource
    Rheoligie von viskose. 2. Einfluß des CS2-einsatzes bei der viskosierung unterschiedlich vorbehandelter zellstoffe auf den lösungszustand der viskoseTeil 1: siehe[1] (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 722-725 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Viscoses prepared from untreated pulp and from pulp pretreated by high-energy radiation were rheologically examined. The results are discussed with regard to the state of solution of the viscoses. It turned out to be possible, when preparing the viscose from pretreated pulp, to reduced the addition of CS2 to a level below 30% (in relation to cellulose) without deteriorating the state of solution of the viscose.
    Notes: Viskosen aus unbehandeltem und strahlenvorbehandeltem Zellstoff wurden rheologisch untersucht. Die Meßergebnisse werden hinsichtlich des Lösungszustandes der Viskose diskutiert. Es zeight sich, daß bei den Viskosen aus strahlenvorbehandeltem Zellstoff eine Verminderung des CS2-Einsatzes bei der Viskoseherstellung bis auf Werte unter 30% CS2 (Bezogen auf Cellulose) möglich ist, ohne den Lösungszustand der Viskose zu verschlechtern.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331212
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  • 6
    Electronic Resource
    Electronic Resource
    Rheologie von Viskose. 3. Zur Rheologie des Naßspinnprozesses bei der Herstellung von ViskosefasernTeil 2: siche [2]Hern Professor Dr. habil. Burkart Philipp zum 60. Geburtstag gewidmet (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 95-99 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The principles of fibre formation in the wet spinning process are investigated by means of rheological measurements. The 1st normal stress difference of technologically important shear rates is determined from the die swell of a freely emerging viscose jet. Moreover, the Barus swell of a viscose jet extruded into spinning bath as well as the rheological strength as a function of the spin-draw ratio of the filament were determined. The load-elongation diagram resulting from the deformation of the jet is shown to be essential for the stability of the spinning process.
    Notes: Grundlagen der Fadenbildung beim Naßspinnprozeß werden an Hand rheologischer Messungen untersucht. Dazu wird die 1. Normalspannungsdifferenz für betrieblich relevante Schergeschwindigkeiten aus der Strahlaufweitung eines frei austretenden Viskosestrahls ermittelt. Des weiteren werden die Barusaufweitung eines in ein Spinnbad extrudierten Viskosestrahls sowie die rheologische Kraft in Abhängigkeit von Verzug des Fadens bestimmt und das aus der Strahlverformung resultierende Beanspruchungs-Dehnungs-Diagramm als wesentlich für die Spinnstabilität begründet.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360208
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  • 7
    Electronic Resource
    Electronic Resource
    Möglichkeiten zur Verbesserung der Reaktivität von ChemiefaserzellstoffHerrn Professor Dr. habil. Burkart Philipp zum 65. Geburtstag gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 279-284 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The notion of the reactivity of dissolving pulps, which is used to explain differences in the chemical behaviour during subsequent processing to viscose, was characterized by the molecular weight distribution of cellulose, 13C-NMR investigations of the pulp, determination of the clogging value of the viscose when using reduced CS2 quantities, and distribution of the xanthate groups. Three possibilities for enhancing the reactivity of dissolving pulps are demonstrated: Pretreatment of pulp with electron-rays prior to processing of viscose, enhanced delignification of the pulp during discontinuous cooking, and energy-intensified hi-heat washing during continuous cooking permit the production of pulps having higher reactivity.
    Notes: Die Reaktivität von Chemiefaserzellstoffen, die zur Erklärung der Unterschiede im chemischen Verhalten bei der Verarbeitung zu Viskose herangezogen wird, wurde durch die Molmassenverteilung der Cellulose, durch 13C-NMR-Untersuchungen des Zellstoffs, Bestimmung des Filterwertes der Viskose bei reduziertem CS2-Einsatz und durch die Verteilung der Xanthatgruppen charakterisiert. Drei Möglichkeiten zur Erhöhung der Reaktivität des Zellstoffs werden aufgezeigt: Die Behandlung des Zellstoffs mit Elektronenstrahlen vor der Verarbeitung zu Viskose, die stärkere Delignifizierung des Zellstoffs bei der diskontinuierlichen Kochung und die energieintensivierte Hi-Heat-Wäsche.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410504
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  • 8
    Electronic Resource
    Electronic Resource
    Developing flame retarded plastics: New guidance wanted (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 3 (1979), S. 167-170 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The development of plastics with improved flame retardant properties is going through a phase of stagnation. Fire test concepts are following a new direction and the serial tests currently used do not adequately tie up with the development objective of reducing fire risks. In the short term no improvement in this situation is expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810030309
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  • 9
    Electronic Resource
    Electronic Resource
    Rheologie von Viskose. 1. Einfluß des Polymergehaltes und des Durchschnittspolymerisationsgrades auf das Fließverhalten von Viskose (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 527-531 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The stabilization of the spinning process and the optimization of the production process require information on the rheological behaviour of the spinning solution. Measurement results of the influence of polymer content and average degree of polymerization on the viscoelastic behaviour of cellulose xanthate solutions (viscose solutions) on industrial conditions are presented. Besides, results in connection with the stability of the spinning process considering the cohesive fracture are discussed.
    Notes: Die Stabilisierung des Spinnprozesses sowie die Optimierung des Produktionsprozesses erfordern spezifische Aussagen zum rheologischen Verhalten der Spinnlösung. Meßergebnisse über den Einfluß von Polymergehalt und Durchschnittspolymerisationsgrad auf das viskoelastische Verhalten von Cellulosexanthogenat-Lösungen (Viskoselösungen) bei betriebsnahen Beanspruchungen werden mitgeteilt und die Ergebnisse im Zusammenhang mit der Stabilität des Spinnprozesses unter Berücksichtigung des kohäsiven Bruchs diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310811
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