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  • 1
    Publication Date: 2011-08-24
    Description: A combination of scanning electron microscopy (SEM) and environmental scanning electron microscopy (ESEM) techniques, as well as atomic force microscopy (AFM) methods has been used to study fragments of the Martian meteorite ALH84001. Images of the same areas on the meteorite were obtained prior to and following gold/palladium coating by mapping the surface of the fragment using ESEM coupled with energy-dispersive X-ray analysis. Viewing of the fragments demonstrated the presence of structures, previously described as nanofossils by McKay et al. (Search for past life on Mars--possible relic biogenic activity in martian meteorite ALH84001. Science, 1996, pp. 924-930) of NASA who used SEM imaging of gold-coated meteorite samples. Careful imaging of the fragments revealed that the observed structures were not an artefact introduced by the coating procedure.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Journal of microscopy (ISSN 0022-2720); Volume 189 Pt 1; 2-7
    Format: text
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 11 (1997), S. 0 
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Instances of rapid failure of copper-pipe plumbing in potable-water systems installed in large municipal buildings have led to a review of the use of alternative materials including stainless steel. This paper reports the findings of an in-situ study which investigated biofilm development on types 304 and 316 stainless-steel piping in a filtered and unfiltered, hot and cold-water supply system installed in a large public building in the west of Scotland. This building had experienced severe corrosion problems with copper pipework.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    World journal of microbiology and biotechnology 12 (1996), S. 113-114 
    ISSN: 1573-0972
    Keywords: Adhesion ; anaerobic corrosion ; biocorrosion ; Desulfovibrio ; lipopolysaccharide ; sulphate-reducing bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The lipopolysaccharide of the sulphate-reducing bacterium Desulfovibrio desulfuricans was analysed by GC, combined either with flame-ionization detection or with MS, and by standard chemical tests. The major sugar of the polysaccharide portion of the macromolecule was glucose (56%). Low amounts of mannose, galactose, rhamnose and amino sugar were also found. Six fatty acids were identified in the lipid A fraction: 9-octadecenoic, tetracosenoic, heptadecenoic, 10-octadecenoic, eicosenoic and 8-octadecynoic.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary This communication reports the presence of polysaccharides in biofilms formed by pure and mixed cultures of Desulfovibrio desulfuricans and Pseudomonas fluorescens on mild and stainless steel surfaces. The results of colorimetric assays, indicating significant differences between the amounts of neutral sugars present in these biofilms, were supported by gas chromatographic (GC)-mass spectrophotometric and GC-flame ionisation detection analyses. Neutral sugars in biofilms grown on mild steel surfaces were identified and quantified, revealing glucose as a major carbohydrate followed by mannose and galactose in all types of biofilm. Extracellular polymeric substances (EPS) precipitated from bacterial cultures grown with and without steel surfaces were also analysed for their carbohydrate content. The influence of the surfaces present in the cultures on the amount and type of sugars released into the bulk phase was established. There was significantly more carbohydrate in EPS harvested from pure and mixed cultures of D. desulfuricans incubated mild and stainless steel coupons than in EPS obtained from coupon-free cultures. No significant difference in sugar quantities was observed in EPS precipitated from cultures of P. fluorescens grown under different conditions (absence or presence of steel surfaces). The main carbohydrates identified in all types of EPS samples were mannose, glucose and galactose in order of prevalence.
    Type of Medium: Electronic Resource
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