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Abstract  

The power-time curves of the growth of three strains of petroleum bacteria at different temperatures have been determined. A novel equation of a power-time curve has been proposed in this paper. The general formula to calculate the rate constant of the bacterial growth has been derived. The rate constants of the bacterial growth at different temperatures, the heat production per newly formed bacterium, the bacterial number at the end of the bacterial growth and the deceleration rate constant of the bacterial growth at 50.00°C, have been calculated. The optimum growth temperatures of the three strains have been obtained.

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Abstract  

Bacterial growth power-time curves were determined by using the 2277 Thermal Activity Monitor. The growth rate constants at different temperatures and acidities were calculated via the optimum growth temperature and optimum growth acidity obtained.

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Journal of Thermal Analysis and Calorimetry
Authors: Z. Honglin, S. Haitao, N. Zhaodong, and L. Yongjun

Abstract  

The thermal curves ofB. subtilis andP. atruginosa were determined by using a 2277 Thermal Activity Monitor (Sweden). Under inhibitory conditions, an experimental model of bacterial growth was established. The growth rate constant (μ), deceleration rate constant (β) and optimum temperature (T) of bacterial growth were calculated.

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Fusarium langsethiae is a fungus that has recently been implicated in the contamination of small-grain cereal crops such as oats, wheat and barley with high levels of HT-2 and T-2 toxins in many European countries. The epidemiology of this fungus is not well known and may therefore be a bigger problem than currently thought to be. A study was carried out investigating the in vitro growth characteristics of F. langsethiae isolates from contaminated oats and wheat at various temperatures; 15, 20, 25 and 30 °C. Results indicated similar growth trends of oats and wheat isolates of F. langsethiae. Wheat isolates grew significantly (p<0.001) faster than oat isolates although this difference may have been confounded by the age of cultures, with oat isolates collected one year earlier. The estimated optimum growth temperature for all isolates was 24 °C. Isolates were macro-morphologically categorized as having lobed or entire colony margins, and either possessing one of the following colony colours: white, orange or purple. Since the estimated optimum growth temperature of F. langsethiae is typical in temperate summers when small-grain cereals are flowering, it is possible that this species can infect, colonise and possibly contaminate the developing grains with HT-2 and T-2 toxins which are of food safety concern.

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. Growth curves were generated from the absorbance values versus time data, using the average of triplicates. 1.5 Characterisation of antagonistic bacteria For characterisation of the isolated bacteria, analyses of optimal growth temperature and pH, KOH

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Acta Microbiologica et Immunologica Hungarica
Authors: Shams T. Khan, Ajmaluddin Malik, Rizwan Wahab, Omar H. Abd-Elkader, Maqusood Ahamed, Javed Ahmad, Javed Musarrat, Maqsood A. Siddiqui, and Abdulaziz A. Al-Khedhairy

incubated on a rotary shaker at 150 rpm at their respective optimal growth temperatures. The cultures containing 10 5 –10 6 cells/ml were mixed with soft agar (0.7% agar), and the agar plates were seeded with this mixture. Plates were allowed to cool and

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optimum growth temperature of 50 °C. T. lanuginosus is an ascomycete that grows rapidly on various media whose colonies reaching 2.5 to over 5 cm in diameter at 45–50 °C within 2 days ( Singh et al., 2003 ). T. lanuginosus thermally adapted by the

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