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  • 1
    Electronic Resource
    Electronic Resource
    Bioleaching of cobalt from smelter wastes byThiobacillus ferrooxidans (1990)
    Springer
    Journal of industrial microbiology and biotechnology 6 (1990), S. 49-52 
    Details
    ISSN: 1476-5535
    Keywords: Leaching ; Metal recovery ; Strategic metal ; Cobalt ; Smelter waste ; Thiobacillus ferrooxidans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The bioleaching of cobalt from domestic, industrial smelter wastes was studied.Thiobacillus ferrooxidans solubilized Co from sulfidic dross furnace mattes. At pulp densities of 4% (w/v) up to 600 mg of Co per liter of leaching solution was released from nickel matte, corresponding to removal of about two-thirds of the original amount of Co in the matte. Bioleaching methods may be useful as a component of a process for solubilization and recovery of Co from sulfidic smelter mattes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01576176
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Raman shifts due to variations in backbone planarity in a group of polydiacetylenes (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 109-112 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polydiacetylene xBCMU and 9PA crystals, solutions and solution-cast films vary in colour due to differences in backbone order and planarity. Associated with the colour changes are increases in the Raman frequencies of the triple and double backbone bond vibrational modes from those values found in the highly ordered single crystals. These increases are strongly correlated and the ratio of the change in the frequency of the triple bond mode to that of the double bond mode is found to be 1.6 (±0.1) over a wide variation in order. This ratio is compared with the values of 0.3 found under uniform strain and 1.1 predicted by a model of acetylenic to butatrienic delocalisation. The relationship between the Raman frequencies of the yellow solutions and melts and those of the crystal phases suggests that in the former the backbone has a continuous and smoothly curving ‘worm-like’ conformation. Models involving the break-up of the conjugated system by large-angle bond rotations appear to be incorrect for polydiacetylenes. These results have important consequences for theoretical models that predict the dependence of electron delocalisation on backbone order and planarity in polydiacetylenes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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