Transmembrane Behavior of Ca2+ in E. coli Cells impacted by High-Intensity Pulsed Magnetic Field

Ma Haile; He Ronghai; Wang Heli; Luo Lin; Wang Zhenbin

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Transmembrane Behavior of Ca2+ in E. coli Cells impacted by High-Intensity Pulsed Magnetic Field

Ma Haile *,He Ronghai ,Wang Heli ,Luo Lin ,Wang Zhenbin

Jiangsu University

*Correspondence author

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Funding: 国家863计划重点项目（No.2007AA100405）

Opened online:16 February 2009

Accepted by: none

Citation: Ma Haile,He Ronghai ,Wang Heli .Transmembrane Behavior of Ca2+ in E. coli Cells impacted by High-Intensity Pulsed Magnetic Field[OL]. [16 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29059

Transmembrane behavior of Ca2+ in E. coli cells impacted by high-intensity pulsed magnetic field (PMF) was studied. The bacteria were subjected to a treatment of PMF (0-4.5 T, 0-30 pulse numbers). The study found that intracellular calcium concentration ([Ca2+]i) of E. coli was changed significantly with PMF treatment. When sample was treated by PMF (2.5 T, 20 pulse numbers) at 30oC, total number colonies of E. coli 8099 sample decreased 63% while the [Ca2+]i increased 2.2 times as much as the sample without treatment. Change of [Ca2+]i in E. coli cells at logarithm phase is more sensitive to PMF treatment than those at other growth phases. There is certain relativity between transmembrane behavior of Ca2+ in E. coli cells and “biological window effect” corresponding to PMF sterilization effects, so the biological window effect of high-intensity PMF sterilization was validated preliminarily by transmembrane behavior of E. coli cell Ca2+. Effect of pulse number on [Ca2+]i is more placid than that of power. The increase of [Ca2+]i is an important reason of E. coli cells death in PMF sterilization.

Keywords:high-intensity pulsed magnetic field;Escherichia coli;inactivation;intracellular calcium concentration;transmembrane behavior

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