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  • GEOMAR Catalogue / E-Books
  • Articles  (6)
  • Process Engineering, Biotechnology, Nutrition Technology  (4)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Change of concentration profiles during ion beam sputtering at the surface of glasses and oxide layers investigated by induced photon emission
    Amsterdam : Elsevier
    Vacuum 24 (1974), S. 469 
    Details
    ISSN: 0042-207X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0042-207X(74)90006-2
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Continuous determination of ethanol during aerobic cultivation of yeasts (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 20 (1978), S. 799-807 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new sensor for the continuous determination of ethanol during the production of yeasts, growing aerobically on fermentable sugars, is described. The operating principle is based on the detection of ethanol vapor in the exit air. A description of the sensor with a diagram of the measuring electronics is supplied. It was designed for the determination of ethanol contents up to 3 g/liter in aqueous solutions at 30°C. The sensitivity is very high  -  1 ppm ethanol being detectable under these conditions. The aeration rate dose not affect the output signal in a wide range (0.5-2 v/v/m). Besides the unspecific sensitivity of the sensor to other easily oxidizable substances, the influence of the pO2 in the exit air, however, must be taken into account. The application of the sensor is shown in a fed-batch culture of bakers' yeast where aerobic fermentation is caused by increasing the glucose feed rate.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260200603
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  • 5
    Electronic Resource
    Electronic Resource
    A desk-top computer coupled fermentation system for the study of microbial processes: Description and some applications (1982)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 2 (1982), S. 331-336 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The configuration and hardware components of a desk-top computer coupled system for bench-top bioreactors are described. Examples of on-line acquisition of several directly accessible environmental process parameters and computations of directly inaccessible state variables are presented. The system described offers great advantages in experiments for establishing sophisticated control algorithms and for studying the physiological behaviour of microbial populations.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370020405
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  • 6
    Electronic Resource
    Electronic Resource
    Photodegradative wavelength dependence of thermally resistant organic polymers (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1825-1832 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The wavelength dependence of photodegradation of three “high temperature” aromatic polyamide polymers has been very accurately determined by means of a fast grating spectrograph used in conjunction with a high pressure xenon arc. One of these polymers, the poly-(isophthalamide) of 4,4′-bis(p-aminophenyl)-2,2′bithiazole, was found to be degraded significantly by visible light, especially that of 4140 Å, wavelength. Both the poly-terephthalamide of 1,3-bis(3-aminobenzamide) benzene and Du Pont Nomex, also an aromatic polyamide, were damaged primarily by radiation in the near ultraviolet region. Degradation band maxima for these polymers were observed at 3700 Å, and 3600 Å, respectively. All three thermally resistant polymers were thus found to be degraded by light of much longer wavelength than that which is harmful to other common polymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130902
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