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  • Articles  (42)
  • Springer  (42)
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  • Articles  (42)
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  • 1
    Electronic Resource
    Electronic Resource
    Die biologische Abwasserreinigung (1936)
    Springer
    Naturwissenschaften 24 (1936), S. 385-391 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01473925
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Bildung von Brookit in dünnen TiO2-Schichten (1964)
    Springer
    Naturwissenschaften 51 (1964), S. 10-11 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00601717
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  • 3
    Electronic Resource
    Electronic Resource
    Messung der Zerstäubungsraten an Nichtleitern und Bestimmung der Bindungsenthalpie von Kieselglas (1968)
    Springer
    Naturwissenschaften 55 (1968), S. 439-440 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602654
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  • 4
    Electronic Resource
    Electronic Resource
    7-Brom-neopinon-dimethylketal-methoperchlorat (1970)
    Springer
    Monatshefte für Chemie 101 (1970), S. 362-374 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Contrary to thebaine base (1), which on treatment with bromoacetamide in anhydrous methanol is known to give 14-bromocodeinone dimethylketal (2 a), thebaine metho methylsulfate yields the metho salt of the isomeric 7-bromoneopinone dimethylketal (3 a). From the ketone methoperchlorate (3 b) on heating with water or in buffered solution the methoperchlorate of 7-oxo-thebainone (6) and HBr are formed. However, in strongly acidic solutions3 a as well as3 b give 7-bromo-7,8-dehydrometathebainone methoperchlorate (7 a), isomeric with3 b, a key intermediate, from which the diketone methoperchlorates8 a and8 b, the methine9, the methyl enolates10 a and10 b, and finally the 7-bromo-morphothebaine derivatives12 a–d and13 can be obtained.
    Notes: Zusammenfassung Thebain-metho-methylsulfat liefert mit Bromacetamid in absol. Methanol das Methosalz des 7-Brom-neopinon-dimethylketals (3 a) im Gegensatz zur Thebain-Base (1), die das isomere 14-Bromcodeinon-dimethylketal (2 a) ergibt. Aus dem Ketonmethoperchlorat3 b entstehen beim Erwärmen in Wasser oder gepufferter Lösung das Methoperchlorat des 7-Oxo-thebainons (6) und HBr. In stark saurer Lösung hingegen gelangt man von3 a oder3 b zu dem mit3 b isomeren 7-Brom-7,8-dehydrometathebainon-methoperchlorat (7 a). Von diesem ausgehend, wurden die Diketon-methoperchlorate8 a und8 b sowie das Methin9 gewonnen, weiters auch die entsprechenden Methylenolate10 a und10 b. Über7 a führte auch der Weg zu den 7-Brom-morphothebain-derivaten12 a–d und13.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910221
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  • 5
    Electronic Resource
    Electronic Resource
    Engineering bacterial biopolymers for the biosorption of heavy metals; new products and novel formulations (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 451-460 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Bioremediation of heavy metal pollution remains a major challenge in environmental biotechnology. One of the approaches considered for application involves biosorption either to biomass or to isolated biopolymers. Many bacterial polysaccharides have been shown to bind heavy metals with varying degrees of specificity and affinity. While various approaches have been adopted to generate polysaccharide variants altered in both structure and activity, metal biosorption has not been examined. Polymer engineering has included structural modification through the introduction of heterologous genes of the biosynthetic pathway into specific mutants, leading either to alterations in polysaccharide backbone or side chains, or to sugar modification. In addition, novel formulations can be designed which enlarge the family of available bacterial biopolymers for metal-binding and subsequent recovery. An example discussed here is the use of amphipathic bioemulsifiers such as emulsan, produced by the oil-degrading Acinetobacter lwoffii RAG-1, that forms stable, concentrated (70%), oil-in-water emulsions (emulsanosols). In this system metal ions bind primarily at the oil/water interface, enabling their recovery and concentration from relatively dilute solutions. In addition to the genetic modifications described above, a new approach to the generation of amphipathic bioemulsifying formulations is based on the interaction of native or recombinant esterase and its derivatives with emulsan and other water-soluble biopolymers. Cation-binding emulsions are generated from a variety of hydrophobic substrates. The features of these and other systems will be discussed, together with a brief consideration of possible applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000438
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  • 6
    Electronic Resource
    Electronic Resource
    phonon dispersion and martensitic phase transition in ordered alloys (1999)
    Springer
    The European physical journal 11 (1999), S. 75-81 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion - 81.30.Kf Martensitic transformations - 61.12.-q Neutron diffraction and scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In a previous neutron scattering study, we had observed that the TA phonon softening in L12-ordered ferromagnetic Fe72Pt28 Invar is pronounced at the zone boundary M-point and leads to an antiferrodistortive phase transition at low temperatures. Here, we report on similar neutron scattering investigations on two ordered crystals with higher Fe content to investigate the relation between the TA phonon softening and the martensitic transformation, which occurs in Fe-rich ordered Fe-Pt. We find that the TA phonon softening, especially at the M-point zone boundary, does not depend on the composition of the investigated crystals. In Fe74.5Pt25.5, however, the antiferrodistortive phase transition temperature is enhanced due to tetragonal strain preceding the martensitic transition. In Fe77Pt23 a precursor driven premartensitic phase transition is not observed. The structure of the martensite is, however, influenced by the soft mode lattice instability of the austenite. This would explain the origin of structural details found previously for Fe3Pt thermoelastic martensite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050918
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of atomic order on [110] phonon softening [4] and displacive phase transition in Invar alloys (1999)
    Springer
    The European physical journal 10 (1999), S. 641-648 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion - 64.70.Kb Solid-solid transitions - 65.40.+g Heat capacities of solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The acoustic phonon dispersions of two Invar crystals , one ordered with the ( ) structure, the other disordered fcc, have been investigated between 3.4 K and 470 K by inelastic and elastic neutron scattering. For the ordered crystal, pronounced softening of the whole phonon branch is observed on cooling below the Curie temperature. Particularly strong phonon softening at the M-point zone boundary of the structure leads to a displacive, antiferrodistortive phase transition at low temperatures. For the disordered crystal, much weaker softening of the phonons is observed and restricted to the region near the Brillouin zone center, where increasing elastic scattering with decreasing temperature indicates the growth of local tetragonal strain. This strain is considered as a typical precursor of the transformation to bct martensite. Specific heat measurements, performed at low temperatures on both crystals confirm the neutron scattering results and reveal considerable enhancement of the low energy phonon density of states in the ordered crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050896
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  • 8
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchung von Transversalschnitten dünner Schichten auf festen Unterlagen (1969)
    Springer
    The European physical journal 224 (1969), S. 122-125 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method is described which allows to prepare transverse sections of thin films by means of an ion etching technique so that transmission electron micrographs of the film structure can be carried out. A section through a 6-layered optical film with a total thickness of 0.62 μm is shown as an example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392239
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  • 9
    Electronic Resource
    Electronic Resource
    Identification of bacterial sources of soil peptidases (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 219-224 
    Details
    ISSN: 1432-0789
    Keywords: Key words Proteolytic soil bacteria ; Pseudomonas fluorescens ; Bacillus cereus ; Bacillus mycoides ; Metallopeptidases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Four topsoils and three subsoils from an arable field, two grasslands and a beech forest with different ecophysiological properties were investigated for the most abundant proteolytic bacteria. The number of proteolytic bacteria was estimated with the most probable number (MPN) assay using a gelatin-based medium. Subsequent isolations of bacteria were performed on a gelatin-based agar medium. No coherence was observed between site specific properties, MPN counts of proteolytic bacteria and proteolytic activities at the different sites. In the subsoils proteolytic activity was considerably lower than in the corresponding topsoils. Differences in MPN counts of proteolytic bacteria were only significant for the arable field profile in March, with lower values in the subsoil. Pseudomonas fluorescens was the most abundant proteolytic species in all investigated horizons except for the acidic topsoil of the beech forest. Bacillus cereus and B. mycoides were also prominent especially in the topsoils and were less abundant in the subsoils. Flavobacterium-Cytophaga bacteria were enriched in autumn, but were lacking in the beech forest horizons and in the topsoil of the arable field. The results of inhibition assays suggest that the extracellular peptidases formed by these species were metalloenzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050648
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  • 10
    Electronic Resource
    Electronic Resource
    Post treatment of groundwater denitrification fluidized bed reactor effluents to achieve drinking water quality (1998)
    Springer
    Journal of industrial microbiology and biotechnology 20 (1998), S. 354-359 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: fluidized bed; drinking water; post treatment; dentrification; bacterial regrowth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Post treatment of effluents from heterotrophic groundwater denitrification fluidized bed reactors (FBR) designed to achieve drinking water quality has been investigated. The denitrification process adds to the dissolved organic compounds, biomass and bacteria in the effluent. They are also lacking dissolved oxygen. Effluents from the process were treated in combined post treatment processes based on either a trickling filter and sedimentation unit (‘TF combination’) or contact flocculation (‘CF combination’). Both processes were followed by sand filtration, granular activated carbon (GAC) and chlorination. Results regarding total suspended solids (TSS) and turbidity removal showed an advantage to the ‘CF combination’, and the target turbidity (NTU 〈1) was always achieved when the alum dose was 10 or 20 mg l−1. Backwash of the sand filter and GAC column was required after 27 h of operation (average value). An average total reduction in dissolved organic carbon (DOC) of 40% was observed with a final DOC of 3.5–4 mg L−1. Most of the removal of the DOC occurred in the sand filter (28%), while the GAC contribution was smaller (18%). No regrowth potential was observed using the Werner method when a pure culture of Pseudomonas fluorescens P17 was used as inoculum in samples of chlorinated effluent (post chlorination). When a mixed culture of indigenous bacteria was used as inoculum, a high regrowth potential was observed. Installing an additional chlorination unit before the sand filter column (pre and post chlorination) resulted in effluent with no regrowth potential for both Pseudomonas fluorescens P17 and indigenous bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900535
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