Biological Effect and Inactivation Mechanism of Bacillus subtilis Exposed to Pulsed Magnetic Field: Morphology, Membrane Permeability and Intracellular Contents

文献类型： 外文期刊

第一作者： Qian, Jingya

作者： Qian, Jingya;Zhou, Cunshan;Ma, Haile;Li, Shujun;Abdualrahman, Mohammed A. Y.;Qian, Jingya;Zhou, Cunshan;Ma, Haile;Qian, Jingya;Li, Shujun;Yagoub, Abu ElGasim A.;Abdualrahman, Mohammed A. Y.

作者机构：

关键词： Bacillus subtilis;Pulsed magnetic field;Cell morphology;Cell membrane permeability

期刊名称：FOOD BIOPHYSICS （ 影响因子：3.114； 五年影响因子：3.407 ）

ISSN： 1557-1858

年卷期： 2016 年 11 卷 4 期

页码：

收录情况： SCI

摘要： Biological effect and inactivation mechanism of Bacillus subtilis exposed to pulsed magnetic field (PMF) were investigated. Cell morphology, membrane permeability, release of intracellular proteins and damage of deoxyribonucleic acid (DNA) were monitored. The inactivation effect of PMF treatment on B. subtilis was enhanced with the increase in intensity and pulse number. Scanning electron microscopy (SEM) analysis showed that the PMF treated bacterial cells had rough surfaces and damaged cellular membranes. Flow cytometry measurements showed that the cell membrane permeability increased after the PMF treatment. Leakage of intracellular contents, measured as OD, significantly increased with the increase in PMF intensity and pulsed number. A maximum leakage of cytoplasmic contents was detected at intensity of 3.30 T and 30 pulses. Enterobacterial repetitive intergenic consensus - polymerase chain reaction (ERIC-PCR) fingerprint signaled that the DNA was fragmented after the PMF treatment at the intensity of 3.0 T with 30 pulses and 3.3 T with 10, 20 and 30 pulses. These findings may give clues to the mechanism of bacterial cell death due to the PMF treatment.

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