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  • Electronic Resource  (3)
  • Life Sciences (general)  (2)
  • 76.80  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Laser nitriding of iron: Nitrogen profiles and phases (1995)
    Springer
    Applied physics 61 (1995), S. 1-5 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.Ba ; 52.75.-d ; 81.60.Bn ; 76.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538202
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  • 2
    Electronic Resource
    Electronic Resource
    Einfluß von Lipidfraktionen mikrobieller Herkunft auf die Wasserausnutzung in der biologissechen Stoffproduktion von Kulturpflanzen (1987)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 7 (1987), S. 201-206 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Effects of exogenous applied lipids being of microbial origin on the water use efficiency (WUE) and the biomass production have been studied in pot and field experiments using crop plants.Lipid mixtures extracted from the cells of Candida maltosa EH 15 increased the WUE (9…16%) and the grain yield (÷x = 10%) of the wheat and barley plants under dry conditions. The fatty acid fraction separated from the lipid mixtures also improved the WUE especially under stress (20…100%) and the biomass production. The phosphatide fraction emulsified with sulfonate containing solvents was not physiologically active.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370070223
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  • 3
    Electronic Resource
    Electronic Resource
    A new procedure of a two-step cultivation of microorganisms. Part II. Application to the procedure of SCP-production on the basis of sucrose (1990)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 10 (1990), S. 311-316 
    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 two-step cultivation of microoganisms described in part I of this series will be explained by referring to its application to the production of SCP on the basis of sucrose/molasses as carbon sources. The inactivation of the yeast Candida utilis is carried out thermally, and the specific death rate was determined to be between 119 × 10-4 s-1, and 324 × 10-4 s-1, respectively. With this new procedure the apparent productivity could be increased by 96.6%, the yield coefficient of molasses increased by 5.8% and of sucrose by 12.9%. The crude protein content of the product in the case of sucrose rose by 104%. The variability of process design is demonstrated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370100320
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