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  • 1
    Electronic Resource
    Electronic Resource
    Predicting Thermophilic Spore Population Dynamics for UHT Sterilization Processes (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 57 (1992), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mathematical model of Bacillus stearothermophilus spore populations during lethal heating treats activation of dormant spores and inactivation mechanisms affecting dormant/activated spores. Rate constants of activation/inactivation processes were determined from isothermal survivor curves of experiments in 105, 110, 115, and 120°C and corresponding simulations with the model. Variations of rate constants with temperature were incorporated by Arrhenius equations responding to general temperature regimes. Tests demonstrated high correspondence between experimental survivor curves and those generated by simulations with the model for isothermal and dynamic, lethal heating. Tests also indicated Arrhenius rate constants at low lethal temperatures (105-120°C) and the model may apply to ultra high temperature. The new model was more effective than the traditional model in representing and predicting spore population dynamics during lethal heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1992.tb11310.x
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  • 2
    Electronic Resource
    Electronic Resource
    Irradiation as a Pretreatment to Thermal Processing (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 66 (2001), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : The Paired Equivalent Isothermal Exposures (PEIE) method was used to quantify the impact of irradiation pretreatments (0, 1.0 and 3.0 kGy) on thermal sensitivity of Bacillus stearothermophilus spores in canned pea puree. Mean rate constants, k121.IC and activation energy values, Ea, for spore inactivation were 0.26, 0.28 and 0.38 min−1 and 250, 200 and 200 kJ/mol for 0, 1.0 and 3.0 kGy, respectively. These parameters were used to simulate thermal processes that achieve equivalent sterilizing values. Computer retort simulations demonstrated the potential of irradiation pretreatment to reduce overall thermal exposures by about 10% and 25% for product pretreated with 1.0 and 3.0 kGy, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2001.tb15184.x
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  • 3
    Electronic Resource
    Electronic Resource
    Iterative Method for Kinetic Parameter Estimation from Dynamic Thermal Treatments (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 62 (1997), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The purpose of this work was to utilize the Equivalent Point Method (EPM) for kinetic parameter estimation from dynamic thermal treatments. An assumption which was fundamental to the EPM, however, when found invalid led to the development of an alternative approach, the method of Paired Equivalent Isothermal Exposures (PEIE). The method provided conceptual simplicity and ease-of-use as well as improved accuracy and reproducibility. The fundamental assumption of the EPM was tested on a mathematical basis, and demonstrated with example calculations. Development of the PEIE method was explained and described with procedural steps. Sample calculations described implementation details of PEIE. The method successfully estimated Arrhenius kinetic parameters from realistic, arbitrary, dynamic thermal treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1997.tb04357.x
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  • 4
    Electronic Resource
    Electronic Resource
    Matter and energy flows in biological and ecological systems
    Amsterdam : Elsevier
    Journal of Theoretical Biology 57 (1976), S. 203-223 
    Details
    ISSN: 0022-5193
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-5193(76)80013-6
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  • 5
    Electronic Resource
    Electronic Resource
    Simulated effects of changing strategies on production performance of Gobra Zebu cattle
    Amsterdam : Elsevier
    Agricultural Systems 23 (1987), S. 277-286 
    Details
    ISSN: 0308-521X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0308-521X(87)90048-5
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of Predictive Models for Bacterial Spore Population Resources to Sterilization Temperatures (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Comparisons of characteristics of recent models and the conventional model of bacterial spore populations during thermal sterilization showed the conventional model was inadequate for general representation because it lacks activation of dormant spores. New models accounting for activation differed in other assumptions but obviated heat shock of indicator spores required when using the conventional model in validations of thermal sterilization. Comparisons of rate constants and simulated and experimental responses of models of B. stearother-mophilus spores in constant and dynamic temperatures showed one new model was more general, more accurate and preferred. Arrhenius equations accurately described temperature dependencies of all rate constants of that model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb03250.x
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