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A microcalorimetric study of the biologic effect of Mn(II) on Bacillus thuringiensis growth

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Abstract

A microcalorimetric technique based on the bacterial heat-output was explored to evaluate the effect of Mn(II) on Bacillus thuringiensis. The power-time curves of the growth metabolism of B. thuringiensis and the effect of Mn(II) on it were studied using an LKB-2277 BioActivity Monitor, ampoules method, at 28°C. For evaluation of the results, the maximum peak-heat output power (P max) in the growth phase, the growth rate constants (k), the log phase heat effects (Q log ), and the total heat effect in 23 h (Q T) for B. thuringiensis were determined. Manganese has been regarded as the essential biological trace element. Mn(II) of different concentration have different effects on B. thuringiensis growth metabolism. High concentration (800-1600 μg mL-1) of Mn(II) can promote the growth of B. thuringiensis; low concentration (500-800 μg mL-1) can inhabit its growth.

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Authors and Affiliations

  1. Key Laboratory of Agricultural Microbiology of Chinese Agriculture Ministry, Huazhong Agricultural University, Wuhan, 430070, P. R. China

    J. Yao, M. Sun & Z. N. Yu

  2. Department of Chemistry, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072, P. R. China

    Y. Liu, Z. T. Gao, P. Liu & S. S. Qu

Authors
  1. J. Yao
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  2. Y. Liu
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  3. Z. T. Gao
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  4. P. Liu
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  5. M. Sun
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  6. S. S. Qu
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  7. Z. N. Yu
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Yao, J., Liu, Y., Gao, Z.T. et al. A microcalorimetric study of the biologic effect of Mn(II) on Bacillus thuringiensis growth. Journal of Thermal Analysis and Calorimetry 70, 415–421 (2002). https://doi.org/10.1023/A:1021616305653

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  • DOI: https://doi.org/10.1023/A:1021616305653

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