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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of a Microbially Produced Structural Modification of Magnesium-Ammonium Orthophosphate (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 1431-1442 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Magnesium-ammonium orthophosphate hydrate; Struvite; Trace impurities; Biomineralization; Azospirillum brasilense.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  IR-Spektroskopische, röntgendiffraktometrische, thermogravimetrische, mikroskopische, atomabsorptionsspektrometrische und ionenchromatographische Untersuchungen von unlöslichen mineralischen Kristallen, die sich während der Kultivierung des Bodenbakteriums Azospirillum brasilense (Stamm Sp245) in einem synthetischen phosphathältigen Medium abschieden, wurden durchgefürt. Die Struktur und chemische Zusammensetzung des Minerals sowie seiner eingeschlossenen Metallionen, die Verteilung von biologisch bedeutsamen Spurenelementen zwischen der Festphase und dem Kulturmedium sowie wichtige Aspekte der Biomineralisierung werden diskutiert.
    Notes: Summary.  Infrared spectroscopic, X-ray diffraction, thermogravimetric and microscopic studies, atomic spectrometry, and ion chromatography trace elemental analyses of insoluble mineral crystals produced in a synthetic phosphate-containing medium during cultivation of the soil bacterium Azospirillum brasilense (strain Sp245) were carried out. The structure and chemical composition of the mineral, including the entrapped metal cations, the distribution of trace impurities of biologically important cations between the cultivation medium and the solid phase formed therein, and some aspects related to biomineralization, are considered and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007060050301
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical and Biological Parameters as Tools to Evaluate and Improve Heavy Metal Phytoremediation (2000)
    Springer
    Bioscience reports 20 (2000), S. 239-258 
    Details
    ISSN: 1573-4935
    Keywords: heavy metals ; phytoremediation ; bioremediation ; bioavailability ; chemical availability ; soil microorganisms ; plant-microbe interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In this review, chemical and biological parameters are discussed thatstrongly influence the speciation of heavy metals, their availability tobiological systems and, consequently, the possibilities to usebioremediation as a cleanup tool for heavy metal polluted sites. In orderto assess heavy metal availability, a need exists for rapid, cost-effectivesystems that reliably predict this parameter and, based on this, thefeasibility of using biological remediation techniques for site managementand restoration. Special attention is paid to phytoremediation as anemerging technology for stabilization and remediation of heavy metalpollution. In order to improve phytoremediation of heavy metal pollutedsites, several important points relevant to the process have to beelucidated. These include the speciation and bioavailability of the heavymetals in the soil determined by many chemical and biological parameters,the role of plant-associated soil microorganisms and fungi inphytoremediation, and the plants. Several options are described how plant-associated soil microorganisms canbe used to improve heavy metal phytoremediation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026436806319
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  • 3
    Electronic Resource
    Electronic Resource
    Application of transmission Mössbauer effect spectroscopy to the study of electrocatalysis and adsorption phenomena at the nickel hydroxide electrode (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 577-580 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Mössbauer parameters for ferric hydroxo forms in alkaline matrices, ferric oxyhydroxide and its admixture at the nickel hydroxide electrode surface as well as for ferric hydroxo species absorbed at nickel hydroxides from strongly alkaline solutions have been compared. The feasibility of transmission Mössbauer spectra acquisition for the adsorbed species in the presence of dissolved forms (e.g. in situ) is based on the principle that the latter give no Mössbauer effect at room temperature owing to their diffusional mobility, while the former, being fixed at the adsorbent surface, have been shown to exhibit a sufficient resonant absorption. The effects of adsorption and water have been noted. Some questions connected with anodic oxygen evolution electrocatalysis by iron species involved in the anodic process at the nickel hydroxide electrode are also discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.7401901107
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  • 4
    Electronic Resource
    Electronic Resource
    Application of transmission Mössbauer spectroscopy to the surface study of Ni(II)-Fe(III) hydroxide electrocatalysts: Comparison with AES data (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 949-954 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Transmission Móssbauer spectra of binary coprecipitated nickel(II)-iron(III) hydroxides (molar ratios 9:1 and 4:1) are analysed and compared with the results of AES analyses of their surface composition. A correlation between the data of the above techniques has been noted, indicating a redistribution of the components (i.e. Ni and Fe) in the surface layers, the latter being enriched with iron(III) as compared to the bulk. The results obtained are in good agreement with an excellent electrocatalytic activity of composite Ni-Fe hydroxide systems towards anodic oxygen evolution in alkaline electrolytes, taking into account a distinctly exhibited ‘surface’ electrocatalytic effect of ferric species on the nickel hydroxide electrode in the anodic oxygen evolution process revealed previously. Transmission Móssbauer spectroscopy has been shown to be a highly effective probe sensitive both to various bulk and surface effects related to the solid phases studied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740201204
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    Paper (German National Licenses)
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