Kinetics of Escherichia coli destruction by microwave irradiation

Article Abstract:

The destruction kinetics of Escherichia coli by microwave irradiation was studied using a household microwave oven. Depending on the power level and the exposure time, a linear rate of temperature increase (A) was measured in phosphate buffer at pH 7.0. Survival curves of bacteria were measured and the rate constant of destruction as well as starting temperatures were estimated. The kinetics of destruction were measured under different osmolarities, pH values and container shapes. The results showed that effects on A could be usedto predict survival curves. Furthermore, destruction kinetics can be interpreted mainly as thermal effects.

Physiological aspects, Bacteria, Microwave heating

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Tailing of thermal inactivation curve of Aspergillus niger spores

Article Abstract:

The thermal sensitivity of Aspergillus niger 326 was investigated to examine tailing in nonlinear thermal inactivation of the fungal spores. The cells were inactivated at constant temperatures around 60 degrees Centigrade. The thermal inactivation curve consisted of a shoulder, an accelerated decline and a tail. In a thermotolerant-subpopulation model, it was shown that the number of cells inactivated increased with increasing temperature. The rate of inactivation was influenced by cell concentration.

Spores (Bacteria), Bacterial spores, Microorganisms, Temperature effects

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Modeling surface growth of Escherichia coli on agar plates

Article Abstract:

A mathematical model is used to study the surface growth of Escherichia coli cells on a membrane filter placed on a nutrient agar plate under various conditions. Several characteristics of the surface growth of bacterial cells under various growth conditions are discovered and the applicability of this model is examined to describe the growth curves.

Science & research, Genetic aspects, Microbial growth, Chemical properties, Agar

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