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  • Industrial Chemistry  (2)
  • Inorganic Chemistry  (2)
  • Pisum  (2)
  • Solanum  (2)
  • crystal structure  (2)
  • 75.30.Et
  • 1995-1999  (6)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Planta 196 (1995), S. 720-726 
    ISSN: 1432-2048
    Schlagwort(e): β-Oxidation ; Mitochondrion ; Palmitoylcarnitine ; Pisum ; Solanum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Planta 196 (1995), S. 720-726 
    ISSN: 1432-2048
    Schlagwort(e): β-Oxidation ; Mitochondrion ; Palmitoylcarnitine ; Pisum ; Solanum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 1112-1112 
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 71 (1999), S. 1028-1029 
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 153-156 
    ISSN: 0044-2313
    Schlagwort(e): Tripotassium oxide chloride ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: The Crystal Structures of α- and β-K3OClThe orange coloured compound K3OCl has been prepared. It exists in a low temperature modification (α-K3OCl) and a high temperature modification (β-K3OCl). The transition temperature is 364 ± 5 K. The crystal structures were determined by x-ray diffraction. α-K3OCl crystallizes at room temperature in the orthorhombic space group Pbnm (Z = 4) with the cell parameters a = b = 723.9(2) pm and c = 1 027.7(2) pm in the anti-GdFeO3-structure type. The high temperature modification β-K3OCl crystallizes (Z = 1) in the cubic space group Pm3m in the β-Ag3SI-structure type with a = 516.2(2) pm (T = 393 K).
    Notizen: Die orangefarbene Verbindung K3OCl wurde dargestellt. Sie tritt in einer Tieftemperaturmodifikation (α-K3OCl) und in einer Hochtemperaturmodifikation (β-K3OCl) auf. Die Umwandlungstemperatur beträgt 364 ± 5 K. Die Kristallstrukturen wurden durch Röntgenstrukturanalyse aufgeklärt. α-K3OCl kristallisiert bei Raumtemperatur in der orthorhombischen Raumgruppe Pbnm (Z = 4) mit den Gitterkonstanten a = b = 723,9(2) pm und c = 1 027,7(2) pm im anti-GdFeO3-Strukturtyp. Die Hochtemperaturmodifikation, β-K3OCl, kristallisiert mit Z = 1 in der kubischen Raumgruppe Pm3m im β-Ag3SI-Strukturtyp mit a = 516,2(2) pm (T = 393 K).
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    ISSN: 0044-2313
    Schlagwort(e): Inter alkali metal chalcogenides ; rubidium lithium selenide ; X-ray ; crystal structure ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Preparation and Crystal Structure of RbLiSeRbLiSe is in the system Rb2Se/Li2Se the only ternary phase without mixed crystals of the binary compounds. The single crystal X-ray investigation of this yellow hygroscopic compound leads to the tetragonal space group P4/nmm (Z = 2) with the lattice constants a = 461.6(1) and c = 748.2(3) pm. Its crystal structure confirms a simple rule of expected structure types for inter alkali metal chalcogenides of the general formula ABX.
    Notizen: Im System Rb2Se/Li2Se wurde RbLiSe als einzige Phase gefunden. Mischkristallbildung konnte nicht beobachtet werden. Die gelbe, sehr hygroskopische Verbindung kristallisiert nach Einkristalluntersuchungen tetragonal in der Raumgruppe P4/nmm (Z = 2) mit den Gitterkonstanten a = 461,6(1) und c = 748,2(3) pm. Als Vertreter des anti-PbFCl-Strukturtyps befolgt RbLiSe eine von uns empirisch ermittelte „Regel“ zur Struktursystematik der ternären Interalkalimetallchalkogenide des Formeltyps ABX.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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