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  • 1990-1994  (6)
  • 1945-1949
  • CO hydrogenation  (2)
  • Vicia faba  (2)
  • Zinc  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Metal dispersion dependent selectivities for syngas conversion on faujasite X hosted rhodium (1992)
    Springer
    Catalysis letters 13 (1992), S. 247-259 
    Details
    ISSN: 1572-879X
    Keywords: Faujasite X hosted rhodium ; rhodium particle size ; IR-spectroscopy ; TEM ; CO hydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Different metal dispersions of Na-faujasite X hosted rhodium were generated and characterized by transmission electron microscopy (TEM) and IR-spectroscopy. CO hydrogenation has been studied over these Rh/NaX-zeolite catalysts. The finer rhodium dispersion with a mean particle size of 1–2 nm shows a higher selectivity towards oxygenates (methanol, ethanol and dimethyl ether) as compared to the coarser dispersion (4–5 nm), where nearly exclusively methane and higher hydrocarbons are formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770997
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In situ FTIR spectroscopy on rhodium-exchanged NaX zeolite with different metal dispersion during syngas reaction (1994)
    Springer
    Catalysis letters 27 (1994), S. 119-130 
    Details
    ISSN: 1572-879X
    Keywords: faujasite-hosted rhodium ; in situ FTIR spectroscopy ; CO hydrogenation ; rhodium dispersion ; methanol selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In situ FTIR spectroscopy has been applied to study the reason of the different selectivity behaviour of rhodium in the CO hydrogenation reaction in dependence on the different particle size. Several forms of molecularly adsorbed CO are observed, such as linearly- and bridgedbonded CO on metallic rhodium as well as dicarbonyl species with Rh(I) centres formed by oxidation of Rh(0) with protons in presence of CO. Furthermore, non-reactive formate, acetate, and carbonate species are produced as side products of the reaction. The higher selectivity to oxygenates, particularly to methanol, is explained by the existence of multiple-bonded CO present only on small rhodium crystallites. The multiple-bonded CO formed at low temperatures is converted at higher temperatures to the highly reactive formyl species, which is hydrogenated to methanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806985
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trace elements in drug addicts (1990)
    Springer
    Journal of molecular medicine 68 (1990), S. 507-511 
    Details
    ISSN: 1432-1440
    Keywords: Zinc ; Copper ; Magnesium ; Iron ; Lithium ; Blood ; Heroin abusers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied trace elements (zinc, copper, magnesium, iron, and lithium) by atomic absorption spectrophotometry in the plasma and erythrocytes of 120 subjects: 20 healthy controls and 100 parenteral drug addicts (69 heroin and 31 heroin + other drugs). Plasma Zn and intraerythrocytic Zn and Fe were decreased, whereas plasma and intraerythrocytic Cu were significantly increased in the group of drug addicts with respect to the healthy controls. Moreover, a period of abstinence longer than 10 days was associated with lower plasma levels of Zn and Li in subjects who had taken drugs shortly before they were examined. The presence of serological markers against HBV and HIV did not seem to influence the behavior of the trace elements in blood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01648242
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Zinc levels after intravenous administration of zinc sulphate in insulin-dependent diabetes mellitus patients (1991)
    Springer
    Journal of molecular medicine 69 (1991), S. 640-644 
    Details
    ISSN: 1432-1440
    Keywords: Blood ; Urine ; Intravenous overload ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Diabetic patients commonly have increased urinary excretion of zinc, although blood concentrations may be normal, lowered, or raised. We analyzed zinc levels in plasma and urine after an intravenous overload of zinc sulphate (8 mg) in 22 patients with insulin-dependent diabetes mellitus (IDDM) and 22 healthy individuals. No significant differences were found in basal levels of serum zinc in either group (111±29 μg/dl in IDDM vs 119±19 μg/dl in controls), although urinary excretion of zinc was significantly raised in diabetics (1396±622 μg/24 h) versus controls (611±235 μg/24 h). After zinc overload, both serum and urinary levels of this element varied between the two groups. Serum zinc in IDDM patients initially increased more markedly, and subsequently showed a more significant decline, than in controls. Urinary zinc levels in IDDM patients, in contrast to control values, showed no increase after overload. These alterations in serum and urinary zinc concentrations suggest that our diabetic patients may be zinc-deficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01649424
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Linkage among isozyme, RFLP and RAPD markers in Vicia faba (1993)
    Springer
    Theoretical and applied genetics 85 (1993), S. 937-945 
    Details
    ISSN: 1432-2242
    Keywords: Vicia faba ; Allozyme, RFLP and RAPD markers ; Linkage group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Segregating allozyme and DNA polymorphisms were used to construct a preliminary linkage map for faba bean. Two F2 populations were analyzed, the most informative of which was segregating for 66 markers. Eleven independently assorting linkage groups were identified in this population. One of the groups contained the 45s ribosomal array and could be assigned to the large metacentric chromosome I on which the nucleolar organizer region is located. This linkage group also contained two isozyme loci, Est and Tpi-p, suggesting that it may share some homology with chromosome 4 of garden pea on which three similar markers are syntenic. Additional aspects of the map and the extent of coverage of the total nuclear genome are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215032
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The identification of faba bean (Vicia faba L.) trisomics by translocation tester set (1990)
    Springer
    Euphytica 47 (1990), S. 45-48 
    Details
    ISSN: 1573-5060
    Keywords: Vicia faba ; faba bean ; primary trisomics ; translocation tester set
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Five subtelocentric primary trisomics of Vicia faba L. were isolated from crosses between asynaptic mutants and normal plants or translocation tester stocks. The extra chromosome of each trisomic was identified cytologically by critical multivalent association at metaphase I of meiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040362
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    Paper (German National Licenses)
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