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  • 1
    Electronic Resource
    Electronic Resource
    Mössbauer spectroscopy study of iron-based catalysts used in Fischer-Tropsch synthesis (1995)
    Springer
    Topics in catalysis 2 (1995), S. 71-78 
    Details
    ISSN: 1572-9028
    Keywords: Mössbauer spectroscopy ; Fischer-Tropsch synthesis ; iron-based catalysts ; χ-carbide ; magnetite ; water-gas shift activity ; pretreatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mössbauer spectroscopy investigation of iron-based Fischer-Tropsch (FT) catalysts from the US Department of Energy's LaPorte pilot plant demonstration run (August 1992) has revealed that the ratio of iron in the octahedral site to that in the tetrahedral site in magnetite correlates with the water-gas-shift activity. Studies of the catalysts from laboratory-scale fixed-bed reactor indicate that activation of the oxide precursor with CO results in the formation of χ-carbide (Fe5C2) whose amount decreases with increasing SiO2 content in the catalyst. The Fe5C2 is converted into Fe3O4 during FT synthesis. The FT activity of the catalyst is found to follow the trend of χ-carbide variation indicating that χ-carbide is active for the FT synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01491956
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  • 2
    Electronic Resource
    Electronic Resource
    Regeneration of plants from seed-derived callus of Hybanthus enneaspermus L. Muell., a rare ethnobotanical herb (1999)
    Springer
    Plant cell reports 18 (1999), S. 873-878 
    Details
    ISSN: 1432-203X
    Keywords: Key words Plant regeneration ; Seed-derived callus ; Hybanthus enneaspermus ; Ethnobotanical herb ; Rare
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A procedure was developed for plant regeneration of Hybanthus enneaspermus, a rare ethnobotanical herb from the Deccan peninsula in India, through seed-derived callus. Seeds demonstrated a high induction frequency (69.4±2.8%) and a high yield (364.4±2.5 mg) of light-yellow friable callus on Murashige and Skoog's (MS) medium containing 2.6 μm NAA and 2.2 μm BA within 4 weeks of incubation. After 1 year of subculture, yellow friable and light-green compact calli types were established from initial light-yellow friable callus. Shoot differentiation was achieved from light-green compact callus, but not from yellow friable callus. Shoot differentiation resulted when light-green compact callus was transferred to MS medium supplemented with 8.8 μm BA and 2.6 μm NAA; the highest percentage of calli forming shoots (66.6±4.8%) and the highest number of shoots (8.9±0.3) were achieved in this medium. Differentiated shoot buds elongated to 4–5 cm within 4 weeks. The addition of casein hydrolysate (500 mg/l) and more potassium phosphate (1.86 mm) to the culture medium enhanced shoot differentiation. Rooting was achieved on the shoots using half-strength MS medium containing 4.8 μm IBA. About 70% of the plants were established in pots containing pure garden soil after 2 weeks of hardening. The regenerated plants were morphologically uniform and exhibited normal seed set.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050677
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of radicals spin-trapped in autoxidized linoleic acids: A high performance liquid chromatography and electron spin resonance study (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 829-830 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Electron spin resonance, ESR ; Spin traps ; Autoxidation ; Linoleic acid ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radicals generated in linoleic acid and deuterated linoleic acid have been trapped by the spin trap 2-methyl-2-nitroso-propane (MNP) and identified by electron spin resonance (ESR) and ENDOR spectroscopy. The formation of two distinct secondary alkyl radical adducts (one conjugated, the other non-conjugated, as shown by their UV absorption spectra) was demonstrated by 11, 11-dideuterio-9-cis-12-cis-linoleic acid using HPLC and ESR spectroscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240081204
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    Paper (German National Licenses)
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