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  • Articles: DFG German National Licenses  (30)
  • Chemistry  (26)
  • Indoleacetic acid  (2)
  • asymptotic expansion  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Aerobic oxidation of indole-3-acetic acid with bisulfite
    Amsterdam : Elsevier
    Phytochemistry 14 (1975), S. 1425-1428 
    Details
    ISSN: 0031-9422
    Keywords: (2-sulfoindole)-3-acetic acid ; Indoleacetic acid ; O"2, and HO.radicals. ; bisulfite oxidation ; dioxindole-3-acetic acid ; manganous ion
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)98643-6
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aerobic oxidation of indole-3-acetic acid with bisulfite
    Amsterdam : Elsevier
    Phytochemistry 14 (1975), S. 1425-1428 
    Details
    ISSN: 0031-9422
    Keywords: (2-sulfoindole)-3-acetic acid ; Indoleacetic acid ; O"2, and HO.radicals ; bisulfite oxidation ; dioxindole-3-acetic acid ; manganous ion
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0031-9422(00)98643-6
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crack-tip fields for matrix cracks between dissimilar elastic and creeping materials (2000)
    Springer
    International journal of fracture 103 (2000), S. 327-360 
    Details
    ISSN: 1573-2673
    Keywords: Fracture ; matrix cracks ; elastic-creeping material ; plane strain ; crack-tip fields ; asymptotic expansion ; higher-order terms.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The stress fields near the tip of a matrix crack terminating at and perpendicular to a planar interface under symmetric in-plane loading in plane strain are investigated. The bimaterial interface is formed by a linearly elastic material and an elastic power-law creeping material in which the crack is located. Using generalized expansions at the crack tip in each region and matching the stresses and displacements across the interface in an asymptotic sense, a series asymptotic solution is constructed for the stresses and strain rates near the crack tip. It is found that the stress singularities, to the leading order, are the same in each material; the stress exponent is real. The oscillatory higher-order terms exist in both regions and stress higher-order term with the order of O(r°) appears in the elastic material. The stress exponents and the angular distributions for singular terms and higher order terms are obtained for different creep exponents and material properties in each region. A full agreement between asymptotic solutions and the full-field finite element results for a set of test examples with different times has been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007620114187
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  • 4
    Electronic Resource
    Electronic Resource
    Crack-tip fields in elastic-plastic material under plane stress mode I loading (1997)
    Springer
    International journal of fracture 85 (1997), S. 131-155 
    Details
    ISSN: 1573-2673
    Keywords: asymptotic expansion ; higher-order terms ; Runge-Kutta method ; finite elements ; crack mechanics ; fracture ; elastic-plastic material ; crack-tip field ; the J-integral ; plane stress ; plane strain ; mode I
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract New results on the crack-tip fields in an elastic power-law hardening material under plane stress mode I loading are presented. Using a generalized asymptotic expansion of the stress function, higher-order terms are found which have newly-discovered characteristics. A series solution is obtained for the elastic-plastic crack-tip fields. The expansion of stress fields contains both the $$ r^{t_i } \sigma _{pq}^{(i)} (\theta ;t_i ) $$ and $$ \operatorname{Re} [r^{t_k } \sigma _{rs}^{(k)} (\theta ;t_k )] $$ terms where ti is real and tk is complex; the terms σ(i) pq(θti) and σ(k) rsθtk) are real and complex functions of θ respectively. Comparing the results with that for the plane strain mode I loading shows that: (1) the effect of higher-order solutions on the crack-tip fields is much smaller; and (2) the path-independent integral J also controls the second-order or third-order term in the asymptotic solutions of the crack-tip fields for most of the engineering materials (1 〈 n 〈 11) in plane stress, while the J-integral does not control the second and the third-order terms for the plane strain mode I case for n 〉 3. These theoretical results imply that the crack-tip fields can be well characterized by the J-integral, and can be used as a criterion for fracture initiation under plane stress mode I loading. This is in agreement with existing full-field solutions and experimental data that J at crack growth initiation is essentially independent of in-plane specimen geometry. The comparison confirms the theoretical asymptotic solutions developed in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007361116709
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  • 5
    Electronic Resource
    Electronic Resource
    Estimation of yield, maintenance, and product formation kinetic parameters in anaerobic fermentations (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 26 (1984), S. 1436-1444 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In many anaerobic fermentation processes, high energy bonds in adenosine triphosphate (ATP) are produced when available electrons are converted from organic substrate into extracellular organic products such as ethanol. The true growth yield and maintenance parameters are directly related to the product formation kinetic parameters for these anaerobic processes. Methods are presented which allow all of the experimental measurements to be used simultaneously to estimate these parameters. Results are presented for several different anaerobic fermentations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260261207
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of exponential growth data for yoghurt cultures (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 895-901 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Obtaining accurate estimates of maximum specific growth rate, growth yield, and product yield is important for many fermentation processes. A systematic procedure is presented to select the exponential growth region and estimate the maximum specific growth rate using the covariate adjustment method with all the available measured variables (i.e. biomass, substrate, and product). The procedure is applied to data collected during growth of pure and mixed cultures of Lactobacillus bulgaricus and Streptococcus thermophilus on 3% dry milk under anaerobic conditions. The estimation procedure gives good estimates with relatively narrow confidence intervals even though biomass concentration is measured by an indirect method. The estimated values of maximum specific growth rate range from 0.2805 h-1 for S. thermophilus (ATCC-19258) to 0.4672 h-1 for S. thermophilus (Microlife). Growth and product yields are estimated using regression analysis and the data for the exponential growth region. The growth yields are compared to their theoretical maximum values.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260280617
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  • 7
    Electronic Resource
    Electronic Resource
    Utilization of statistics and experimental design in data collection and analysis (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 2683-2705 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Application of experimental design techniques to Pirt's yield model shows that it is important to collect data at the lowest and highest specific growth rates. In the fed-batch fermentation process, values of specific growth rate can be varied from the maximum value at the start of the process to very low values near the end of the experiment. Candida utilis was cultivated using batch followed by fed-batch culture with glucose as the main source of carbon and energy. Values of substrate concentration, oxygen consumption, carbon dioxide evolution, liquid volume, flow rate cell concentration, and nitrogen concentration, which was an indirect measure of biomass, were measured. Least-squares estimates of the true biomass energetic yield and maintenance coefficient were obtained using a multivariate statistical analysis procedure referred to as the covariate adjustment procedure. Methods of selecting the best estimates using covariate adjustment are illustrated. The results show that useful parameter estimates with relatively short confidence intervals can be obtained using these statistical methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260251114
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  • 8
    Electronic Resource
    Electronic Resource
    Maximum likelihood estimation of growth yields (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 633-649 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This work is concerned with statistical methods to estimate yield and maintenance parameters associated with microbial growth. For a given dilution rate, an experimenter typically measures substrate concentration, oxygen utilization rate, the rate of carbon dioxide evolution, and biomass concentration. These correlated response variables each contain information about the maintenance and yield parameters of interest. A maximum likelihood estimator which combines this correlated information for the yield and maintenance parameters is proposed, evaluated, and tested on literature data. Both point and interval estimators are considered.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240309
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of bioenergetic yield and maintenance parameters associated with mixotrophic and photoheterotrophic growth (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 1640-1651 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Carbon, available electron, and energetic yields are determined from literature data for photoheterotrophic and mixotrophic growth. Maintenance coefficients and energetic yields corrected for maintenance are estimated using covariate adjustment methods for several sets of data. Results are presented and compared for anaerobic photoheterotrophic growth, microaerobic photoheterotrophic growth, aerobic photoheterotrophic growth, and aerobic mixotrophic growth to gain a better understanding of yields for these photosynthetic processes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260271204
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics and bioenergetics of light-limited photoautotrophic growth of Spirulina platensis (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 29 (1987), S. 832-843 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Blue-green algae, Spirulina platensis, is cultivated under photoautotrophic growth conditions designed to have nearly uniform growth rate throughout the fermentor by illumination both sides of a rectangular vessel. The results show that growth rate and bioenergetic yield are a function of light intensity. Several kinetic models are considered to express the relationship between growth rate and light intensity.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260290705
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