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  • 1
    Electronic Resource
    Electronic Resource
    A kernel system for iconic image processing (1989)
    Springer
    Computing 42 (1989), S. 91-108 
    Details
    ISSN: 1436-5057
    Keywords: 68B99 (Software) ; Image processing ; standardization ; system design ; Ada
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Im folgenden stellen wir einen Gestaltungsentwurf für ein ikonisches Bildverarbeitungssystem vor und beschreiben eine virtuelle Maschine, die die hierfür notwendigen Operationen realisiert. Es werden sowohl Datentypen als auch die charakteristischen Operationen der Bildverarbeitung diskutiert, und es werden Datenobjekte sowie Bildverarbeitungsoperationen formal definiert. Abschließend wird eine mögliche Implementation skizziert, die auf den generischen Konstrukten der Programmiersprache Ada basiert.
    Notes: Abstract We present a proposal for the design of a kernel system for iconic image processing operations and construct a virtual machine for image processing. The data structures and typical operations in the field of digital image processing are discussed. Furthermore, we give a formal definition of the operations and data objects required and describe one way to implement them by using the generic features of Ada.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02239741
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  • 2
    Electronic Resource
    Electronic Resource
    Role of the pituitary in cyproheptadine-induced pancreatic beta-cell toxicity (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1495-1497 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Hypophysectomized rats given cyproheptadine (40 mg/kg) for 10 days exhibited a loss of pancreatic immunoreactive insulin and ultrastructural changes in the cytoplasm of beta-cells. Sham-operated animals given cyproheptadine showed identical changes in pancreatic beta-cells except that cytoplasmic involvement progressed to the formation of large vacuoles. The pituitary is not directly involved with the cyproheptadine-induced depletion of pancreatic insulin but plays a role in the formation of large cytoplasmic vacuoles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01918830
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  • 3
    Electronic Resource
    Electronic Resource
    Die Bestimmung von Überführungszahlen nach der Methode der Grenzflächen-Wanderung unter Verwendung von Leitisotopen. Ein neues Verfahren (1962)
    Springer
    Naturwissenschaften 49 (1962), S. 606-606 
    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/BF01178051
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  • 4
    Electronic Resource
    Electronic Resource
    Plant demographic responses to mycorrhizal symbiosis in tallgrass prairie (1994)
    Springer
    Oecologia 99 (1994), S. 21-26 
    Details
    ISSN: 1432-1939
    Keywords: Tallgrass prairie ; VA mycorrhizas Plant demography ; Fire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of mycorrhizal symbiosis on seedling emergence, flowering and densities of several grasses and forbs were assessed in native tallgrass prairie and in sown garden populations at the Konza Prairie in northeastern Kansas. Mycorrhizal activity was experimentally suppressed with the fungicide benomyl. Flowering and stem densities of the cool-season grass, Dichanthelium oligosanthes, sedges (Carex spp.), and the forb Aster ericoides were higher in non-mycorrhizal (benomyl-treated) than in mycorrhizal plots and the magnitude of these differences was significantly affected by burning. Mycorrhizae significantly enhanced flowering of the warmseason grasses Andropogon gerardii and Sorghastrum nutans in burned prairie, but not in unburned sites. These patterns suggest that mycorrhizal effects on the dynamics of cool-season graminoid and forb populations are likely to be mediated indirectly through effects of the symbiosis on the competitive dominance of their neighbors. Seedling emergence rates of the cool-season C3 grasses Elymus canadensis and Koeleria cristata were significantly reduced in the benomyl-treated plots, whereas benomyl treatment had no significant effect on seedling emergence of the warm-season C4 grasses A. gerardii and Panicum virgatum. The forbs showed variable responses. Seedling emergence of Liatris aspera was greater under mycorrhizal conditions, but that of Dalea purpurea was unaffected by mycorrhizal treatment. These results show that effects of mycorrhizal symbiosis on the population dynamics of co-occurring prairie plants vary significantly both among species and among different life history stages within species. The results also indicate that mycorrhizas and fire interact to influence competitive interactions and demographic patterns of tallgrass prairie plant populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317079
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of pressure crystallization on structure and properties of hot-drawn polyethylene (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 717-720 
    Details
    ISSN: 1435-1536
    Keywords: Polyethylene ; high modulus ; hot-drawing ; pressure crystallization ; entanglements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The change of the drawing behaviour of polyethylene is studied as a function of molecular weight and crystallization pressure. The results are interpreted using the entanglement concept for the correlation between draw ratio, tensile modulus and molecular weight. Pressure crystallization of the starting material appears to reduce the number of entanglements formed during the drawing process and increases the maximum obtainable tensile modulus for samples of medium molecular weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410945
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and properties of fluorinated carbon fibers (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 744-749 
    Details
    ISSN: 1435-1536
    Keywords: Fluorination ; carbon fibers ; CF fibers ; mechanical properties ; preferred orientation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The fluorination of carbon fibers results in a partial or total conversion of the carbon layers into CF layers. In constrast to the formation of intercalation compounds of carbon fibers, the fluorination causes considerable changes in the fiber texture which results in a marked decrease of tensile modulus and mechanical strength. The relationship between the structural changes and the resulting mechanical properties is studied by small-angle and wide-angle X-ray scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410948
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of graphitization on the mechanical properties of carbon fibers (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 917-922 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Struktur und Vorzugsorientierung einer Reihe von Kohlefasern mit verschiedenen Graphitierungsgraden wurden röntgenographisch untersucht. Die Beziehung zwischen Vorzugsorientierung und Elastizitätsmodul ist verschieden von der für nichtgraphitische Kohlefasern beobachteten. Der Unterschied wird durch eine Zunahme der Schernachgiebigkeit der Strukturbausteine mit zunehmender Graphitierung erklärt, die bei konstanter Vorzugsorientierung eine Verminderung des Elastizitätsmoduls der Fasern mit steigender Graphitierung zur Folge hat.
    Notes: Summary Structure and preferred orientation of a series of carbon fibers with various degrees of graphitization have been studied by X-ray diffraction. The relationship between preferred orientation and Young's modulus differs from that reported for non-graphitic carbon fibers. The difference is explained by an increase of the shear compliance of the structural unit with increasing graphitization which results, for constant preferred orientation, in a decrease of the Young's modulus of the fiber with increasing graphitization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01584920
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  • 8
    Electronic Resource
    Electronic Resource
    Structure and properties of ultra-high modulus polyethylene (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 174-181 
    Details
    ISSN: 1435-1536
    Keywords: Polyethylene ; ultra-high modulus ; deformation process ; entanglements ; preferred orientation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The relationship between formation, structure and tensile modulus of ultrahigh modulus polyethylene is explained on the basis of a structural model in which entanglements formed during the deformation process play an important rôle. The results of wide- and small-angle X-ray scattering are interpreted in terms of structural parameters derived from this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01465437
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation of enantiomerically pure (R)-(1-hydroxyethyl)dimethyl(phenyl)silane using resting cells of Saccharomyces cerevisiae (DHW S-3) as biocatalyst (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 671-674 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The prochiral sila-ketone acetyldimethyl-(phenyl)silane (1) was reduced enantioselectively into (R)-(1-hydroxyethyl)dimethyl(phenyl)silane [(R)-2] using resting cells of the commercially available yeast Saccharomyces cerevisiae (DHW S-3) as the biocatalyst. The bioconversion was performed on a 2.0-g scale in a 5-1 bioreactor. Starting with a substrate (1) concentration of 0.4 g·1−1, the highest production rate measured for this bioconversion was about 45–55 μmol (R)-2·1−1·min−1. After an incubation time of 1 h, all substrate in the medium had been converted, either biocatalytically reduced to (R)-2 or (probably chemically) converted into dimethyl(phenyl)silanol (Me2PhSiOH). After extraction of the cell-free medium with ethyl acetate/dichloromethane and subsequent purification of the extract by Kugelrohr distillation and chromatography on silica gel (medium-pressure liquid chromatography), 800 mg (yield 40%) of the bioconversion product (R)-2 was isolated. As shown by HPLC studies (cellulose triacetate as the chiral stationary phase) and 1H-nuclear magnetic resonance experiments (after derivatization of the bioconversion product with a chiral auxiliary agent), compound (R)-2 was almost enantiomerically pure (〉 99% enantiomeric excess).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171942
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation of enantiomerically pure (R)-(1-hydroxyethyl)dimethyl(phenyl)silane using resting cells of Saccharomyces cerevisiae (DHW S-3) as biocatalyst (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 671-674 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  The prochiral sila-ketone acetyldimethyl- (phenyl)silane (1) was reduced enantioselectively into (R)-(1-hydroxyethyl)dimethyl(phenyl)silane [(R)-2] using resting cells of the commercially available yeast Saccharomyces cerevisiae (DHW S-3) as the biocatalyst. The bioconversion was performed on a 2.0-g scale in a 5-1 bioreactor. Starting with a substrate (1) concentration of 0.4 g ⋅ l-1, the highest production rate measured for this bioconversion was about 45–55 μmol (R)-2⋅l-1⋅min-1. After an incubation time of 1 h, all substrate in the medium had been converted, either biocatalytically reduced to (R)-2 or (probably chemically) converted into dimethyl(phenyl)silanol (Me2PhSiOH). After extraction of the cell-free medium with ethyl acetate/dichloromethane and subsequent purification of the extract by Kugelrohr distillation and chromatography on silica gel (medium-pressure liquid chromato- graphy), 800 mg (yield 40%) of the bioconversion product (R)-2 was isolated. As shown by HPLC studies (cellulose triacetate as the chiral stationary phase) and 1H-nuclear magnetic resonance experiments (after derivatization of the bioconversion product with a chiral auxiliary agent), compound (R)-2 was almost enantiomerically pure (〉99% enantiomeric excess).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050311
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