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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of the wettability of organic materials in relation to water content by the capillary rise method (2001)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 52 (2001), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A new measuring technique based on a capillary rise method has been developed to quantify the wettability of more or less decomposed peats (the main materials used as horticultural growing media) in relation to their water content. A preliminary study of their physico-chemical and biochemical characteristics enabled us to study the variation of their physical properties (particularly their rewetting capacity) in relation to their degree of decomposition. Analysis of these physical properties during two drying and rewetting cycles showed that the greater their degree of decomposition, the greater and more irreversible was their shrinkage. The change from hydrophilicity to hydrophobicity was measured by the increase of the water contact angle during desiccation and by the progressive change from bipolar to apolar surfaces. A strong correlation between the water retention of peats (related to their degree of decomposition) and their free energy (also called hydration energy) at the interface between solid and water ΔGSW is also shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.2001.00392.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of surface free energy between reconstructed human epidermis and in situ human skin (2000)
    Copenhagen : Munksgaard International Publishers
    Skin research and technology 6 (2000), S. 0 
    Details
    ISSN: 1600-0846
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background/aims: The objectives of this study were to characterise the Episkin® model of reconstructed epidermis histologically and energetic, and to compare the results with the data obtained by Mavon (9, 10) on different areas of skin on the human body and on different skin types.Methods: Histologically, the two skin systems studied were stained using Goldner's trichome method. Surface free energy was determined by the measurement of contact angles, using the posed drop method.Results: Histologically, the two skin systems demonstrated the same cellular organisation in stratified layers. With regard to surface free energy, Episkin, skin from the forehead, normal and hyper-seborrheic skins are hydrophilic surfaces, while skin from the forearm or of an oligo-seborrheic type tends to be hydrophobic. Episkin and skin from the forehead exhibit similar surface free energy profiles. It is impossible to state whether Episkin has characteristics closer to those of normal or hyper-seborrheic skin, but they differ significantly from those of oligo-seborrheic skin.Conclusion: The results obtained during this study justify the use of Episkin in a range of tests where the use of in situ human skin raises problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0846.2000.006004245.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Selective hyperproduction of manganese peroxidases by Phanerochaete chrysosporium I-1512 immobilized on nylon net in a bubble-column reactor (1996)
    Springer
    Applied microbiology and biotechnology 44 (1996), S. 717-723 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Manganese peroxidases were overproduced by Phanerochaete chrysosporium I-1512 immobilized on nylon net in a bubble-column reactor. This study investigates a new design of bioreactor, a compromise between a pneumatic reactor and an immobilized biofilm reactor. The carrier, a sheet of nylon net, was maintained by a cylindrical stainless-steel frame installed vertically. It was characterized by its hydrophilic nature, its surface morphology and its surface roughness. P. chrysosporium adhesion was highly efficient; mycelial hyphae invaded the tridimensional structure and strengthened the bonding to the network, as shown by electron scanning microscopy. High levels of Mn peroxidases were produced by strain I-1512 under conditions of glycerol and nitrogen sufficiency when the medium was supplemented with phospholipid and veratryl alcohol. Yields of 3600 U/l Mn peroxidase were produced after 95 h of incubation, indicating significant productivity for industrial purposes (900 U day-1 l-1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178608
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  • 4
    Electronic Resource
    Electronic Resource
    Selective hyperproduction of manganese peroxidases byPhanerochaete chrysosporium l-1512 immobilized on nylon net in a bubble-column reactor (1996)
    Springer
    Applied microbiology and biotechnology 44 (1996), S. 717-723 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Manganese peroxidases were overproduced byPhanerochaete chrysosporium I-1512 immobilized on nylon net in a bubble-column reactor. This study investigates a new design of bioreactor, a compromise between a pneumatic reactor and an immobilized biofilm reactor. The carrier, a sheet of nylon net, was maintained by a cylindrical stainless-steel frame installed vertically. It was characterized by its hydrophilic nature, its surface morphology and its surface roughness.P. chrysosporium adhesion was highly efficient; mycelial hyphae invaded the tridimensional structure and strengthened the bonding to the network, as shown by electron scanning microscopy. High levels of Mn peroxidases were produced by strain I-1512 under conditions of glycerol and nitrogen sufficiency when the medium was supplemented with phospholipid and veratryl alcohol. Yields of 3600 U/l Mn peroxidase were produced after 95 h of incubation, indicating significant productivity for industrial purposes (900 U day−1 l−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178608
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Immobilization of fungal spores by adhesion (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 47 (1995), S. 677-687 
    Details
    ISSN: 0006-3592
    Keywords: surface treatment ; polycation ; aggregation ; sedimentation ; flow ; Phanerochaete chrysosporium ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Immobilization of conidiospores of Phanerochaete chrysosporium by adhesion was investigated in static and flow conditions on flat and on porous supports. Reducing the electrostatic repulsion between the spores and the support by adsorption of polycations on the support allows a better adhesion efficiency and a higher density of adhering spores and does not affect germination and growth. Formation of spore aggregates either in the suspension (high ionic strength) or on the support tends to decrease the surface coverage and to give an inhomogeneous distribution of adhering spores due to detachment of aggregates. The density of spores adhering from a flowing suspension is lower as compared with static conditions and does not exceed about 2% of surface coverage; this is due to the influence of tangential forces, to the short contact time with the surface, and to perturbation of the hydrodynamics along the surface by the previously immobilized spores. Obtaining a high coverage of the support by immobilized spores requires the absence of a tangential motion. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260470608
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