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  • Articles: DFG German National Licenses  (5)
  • Electronic Resource  (5)
  • Polymer and Materials Science  (3)
  • Metabolism  (2)
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  • Articles: DFG German National Licenses  (5)
Material
  • Electronic Resource  (5)
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Ribose administration during exercise: Effects on substrates and products of energy metabolism in healthy subjects and a patient with myoadenylate deaminase deficiency (1991)
    Springer
    Journal of molecular medicine 69 (1991), S. 151-155 
    Details
    ISSN: 1432-1440
    Keywords: Myoadenylate deaminase ; AMP-deaminase ; Deficiency ; Ribose ; Lactate ; Ammonia ; Hypoxanthine ; Muscle ; Metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nine healthy men and a patient with myoadenylate deaminase deficiency were exercised on a bicycle ergometer (30 minutes, 125 Watts) with and without oral ribose administration at a dose of 2 g every 5 minutes of exercise. Plasma or serum levels of glucose, free fatty acids, lactate, ammonia and hypoxanthine and the urinary hypoxanthine excretion were determined. After 30 minutes of exercise without ribose intake the healthy subjects showed significant increases in plasma lactate (p〈0.05), ammonia (p〈0.01) and hypoxanthine (p〈0.05) concentrations and a decrease in serum glucose concentration (p〈0.05). When ribose was administered, the plasma lactate concentration increased significantly higher (p〈 0.05) and the increase in plasma hypoxanthine concentration was no longer significant. The patient showed the same pattern of changes in serum or plasma concentrations with exercise with the exception of hypoxanthine in plasma which increased higher when ribose was administered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01665856
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolism of D-ribose administered continuously to healthy persons and to patients with myoadenylate deaminase deficiency (1989)
    Springer
    Journal of molecular medicine 67 (1989), S. 1205-1213 
    Details
    ISSN: 1432-1440
    Keywords: (D-)ribose ; Metabolism ; Myoadenylate ; (adenylate-, AMP-)deaminase deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary D-ribose was administered orally or intravenously over at least 5 h to eight healthy volunteers and five patients with myoadenylate deaminase deficiency. Intravenous administration rates were 83, 167, and 222 mg/kg/h, which were well tolerated but oral administration of more than 200 mg/kg/h caused diarrhea. The average steady state serum ribose level ranged between 4.8 mg/100 ml (83 mg/kg/h, oral administration) and 81.7 mg/100 ml (222 mg/kg/h, intravenous administration). Serum glucose level decreased during ribose administration. The intestinal absorption rate of orally administered ribose was 87.8%–99.8% of the intake at doses up to 200 mg/kg/h without first pass effect. Urinary losses were 23% of the intravenously administered dose at 222 mg/kg/h. Ribose appeared to be excreted by glomerular filtration without active reabsorption; a renal threshold could not be demonstrated. The amount of ribose transported back from the tubular lumen depended on the serum ribose level. There was no difference in ribose turnover in healthy subjects and patients with MAD deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01716208
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Anodic oxidation of mercury in the presence of monocyclic ligands in propylene carbonate (1989)
    Weinheim : Wiley-Blackwell
    Electroanalysis 1 (1989), S. 493-499 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of 12 macrocycles containing 4, 6, or 8 N, S, and O heteroatoms (with increasing size from 14 to 24 atoms in the cycle) was studied to ascertain size and heteroatoms effects on the formation and 14 redox characteristics of their mercuric complexes. The concentration dependence of anodic currents at mercury electrodes in solutions of these ligands led to the determination of the formation constants of the complexes generated according to the folling of \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Hg} \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} {\rm Hg}^{{\rm 2 + }} {\rm + 2e}^{\rm - } {\rm,}\,{\rm Hg}^{{\rm 2 + }} {\rm + jL} \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} {\rm (HgL}_{\rm j} {\rm)}^{{\rm 2 + }} $$\end{document} In propylene carbonate, the resulting mercuric complexes were stable (log Ks up to 40) mono- and dinuclear species. Their stability depends both on the nature of the heteroatoms and on the size of the macrocycle. For identical ligand sizes, the stability sequence N 〉 S 〉 O was established for mercuric complexes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140010604
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Amalgam electrodes: Direct electrochemical generation of cadmium macrocyclic complexes (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 19-26 
    Details
    ISSN: 1040-0397
    Keywords: Amalgam electrode ; cadmium ; macrocyclic complexes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical oxidation of cadmium amalgam was studied in the nonaqueous solvents CH2Cl2, 1,2-C2H4Cl2 and propylene carbonate. Significant coordination effects were observed between the electrogenerated Cd(II) ions and 18-membered macromonocyclic ligands, each containing six Lewis bases heteroatoms: 18-O6, 18-S6, 18-N2O4, and 18-N6. The stoichiometries and the stabilities of the resulting complexes were determined. These stabilities increase from 18-O6 or 18-S6 to 18-N6.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040106
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Emulsifier-free polymerization in aqueous media (1955)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 16 (1955), S. 549-576 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polymerization in solution of a variety of water-soluble monomers with a variety of water-soluble redox initiators is described and a detailed study is reported on the polymerization, in aqueous solution, of methyl vinyl ketone and of methyl methacrylate under the influence of potassium sulfate-silver nitrate. Keeping the persulfate concentration constant and varying the silver nitrate or, conversely, keeping the silver nitrate constant and varying the persulfate, it is found that, except at very high concentration of catalyst, both the rate of polymerization and the molecular weight of the polymer bear a linear relation to the square root of the catalyst concentration, in harmony with the general theory of catalyzed bulk and emulsion polymerization. The molecular weight of the polymer formed diminishes with increase in the temperature of polymerization. The study of redox polymerization in water, without emulsifier, has been extended to the case of a mixture of a water-soluble and a water-insoluble monomer, and it has been found that copolymerization proceeds at a reasonable rate and frequently forms a stable latex. The copolymerization of styrene and 5 or 10 per cent of its weight of methacrylonitrile in water under the influence of a water-soluble persulfate-bisulfite redox pair has been examined with some closeness. Polymerization is apparently initiated in the aqueous solution, since, contrary to the state of affairs in emulsion polymerization, water-soluble retarders are more effective than oil-soluble ones, when the retarder is added at the outset. If the retarder is added at a later stage of polymerization, oil-soluble reagents are more effective than water-soluble ones. The water-soluble monomer enters into the polymer at a greater rate than the water-insoluble one, but it appears that, even at the earliest stage at which it is practicable to take samples co-polymerization occurs. The influence of catalyst concentration on the rate of polymerization, the molecular weight of the polymer, and the latex particle size was examined.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1955.120168239
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    Paper (German National Licenses)
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