The effects of direct electric current on the viability and metabolism of acidophilic bacteria

Jackman, Simon A.; Maini, Giacomo; Sharman, Ajay K; Knowles, Christopher J.

doi:10.1016/s0141-0229(98)00128-8

Cited by 82 publications

(45 citation statements)

References 20 publications

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“…The presence of exudate on cell surfaces indicated that irreversible permeabilization of cellular substances might occur due to the exposure to higher currents. The results of a bioelectrokinetic test also suggested that bacterial inactivation might occur by interaction with the surfaces of the electrodes, resulting in cell wall or membrane degradation through oxidation or reduction (10).…”

Section: Discussionmentioning

confidence: 99%

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Effect of Direct Electric Current on the Cell Surface Properties of Phenol-Degrading Bacteria

Luo

Hui

Zhang

et al. 2005

Appl Environ Microbiol

120

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The change in cell surface properties in the presence of electric currents is of critical concern when the potential to manipulate bacterial movement with electric fields is evaluated. In this study, the effects of different direct electric currents on the cell surface properties involved in bacterial adhesion were investigated by using a mixed phenol-degrading bacterial culture in the exponential growth phase. The traits investigated were surface hydrophobicity (measured by adherence to n-octane), net surface electrostatic charge (determined by measurement of the zeta potential), and the cell surface shape and polymers (determined by scanning electron microscope analysis). The results showed that a lower current (less than 20 mA) induced no significant changes in the surface properties of phenol-degrading bacteria, that an electric current of 20 mA could increase the surface hydrophobicity and flatten the cell shape, and that a higher current (40 mA) could increase the surface extracellular substances and the net negative surface electrostatic charge. The results also revealed that the electric current effects on cell hydrophobicity varied with the suspending medium. We suggest that an electric current greater than 20 mA is not suitable for use in manipulation of the movement of the phenol-degrading bacteria, although such a current might favor the electrophoretic movement of the bacterial species.

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Section: Discussionmentioning

confidence: 99%

“…In particular, viability studies have concentrated on the use of pulsed high voltage for inactivation (7,10). However, there has been little research on the effects of DC on the cell surface properties involved in bacterial attachment and movement.…”

mentioning

confidence: 99%

Effect of Direct Electric Current on the Cell Surface Properties of Phenol-Degrading Bacteria

Luo

Hui

Zhang

et al. 2005

Appl Environ Microbiol

120

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“…Table 2 summarizes the results of studies that investigated the effects of electrical current on survival/transport of microorganisms during electrokinetic remediation. The effect of fixed applied electric current on different intensities of bacteria suspended on liquid and soil slurry was investigated [50]. It was found that electric current had a detrimental effect on low cell densities, however, high cell densities survived despite the applied electric field intensities and the controlled current environment [72].…”

Section: Electric Current Density and Voltage Gradientmentioning

confidence: 99%

A Review Article: Electrokinetic Bioremediation Current Knowledge and New Prospects

Hassan¹,

Mohamedelhassan²,

Yanful³

et al. 2016

AiM

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This study discusses factors affecting various processes involved in bioremediation coupled with electrokinetics. The study presents innovative solutions, and proposes new directions. Environmental conditions that have an influence on the characteristics, behavior, and metabolism of indigenous microorganisms are presented. The discussion focuses on overcoming the unfavorable conditions created by electrolysis reactions, prolongation the survival of the microbes at contaminated sites, increase of microbial enzyme secretion, improvement of the indigenous bacteria metabolic pathways, and exploration of metagenomics resources from soil biota. The challenge facing the implementation of conventional bioremediation techniques in precisely and effectively delivering nutrients to indigenous bacteria, particularly in soils with tortuous paths and low hydraulic conductivity is discussed. Current knowledge in application of enhanced biostimulation using electrokinetics is reviewed. The implementation of bioaugmentation in bioremediation coupled with electrokinetics to enhance the outcome of bioremediation is presented. Effects of phenomena associated with electrokinetics in the hybrid remediation approach are discussed.

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“…However, this was mostly the application of a low voltage direct current (DC) field used in electro-bioremediation and electro-phytoremediation [1][2][3][4]. Several studies have demonstrated improved biodegradation of organic pollutants under the influence of a low voltage DC field, due to the induced movement of water, nutrients, contaminants and microorganisms, which led to an overall homogenization of the contaminated soil [2,5].…”

Section: Introductionmentioning

confidence: 99%

Alternating current electrical field effects on lettuce (Lactuca sativa) growing in hydroponic culture with and without cadmium contamination

Schlaak

Siefert

et al. 2010

J Appl Electrochem

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The aim of the present study was to investigate the effect of a 10 Hz alternating current (10 Hz 1 V cm(-1)) and a 50 Hz alternating current (50 Hz 1 V cm(-1)) on the lettuce plant (Lactuca sativa) growing in a hydroponic (soil-free) culture. Thirty lettuce plants were pre-germinated, and then 15 of them were treated with cadmium solution (CdCl2) of 5 mg/L in concentration. Ten plants (five plants with Cd and five plants without Cd) were subjected to a 10 Hz alternating current (AC) electrical field; 10 plants were subjected to a 50 Hz AC field. The rest of the plants were used as a control. The lettuce plants were harvested after a growth of 60 days. The chlorophyll content, biomass and metal content of the lettuce plants were determined. The biomass of the plants growing in non-contaminated medium was 28 and 106% higher under the 10 and the 50 Hz AC fields respectively compared to the control. Although the plant biomass was reduced by the presence of Cd in the growth medium, the biomass of the plants growing in Cd contaminated medium was 40 and 63% higher respectively for 10 and 50 Hz AC field compared to the plant growing in Cd contaminated medium without electrical treatment. Increased uptake of Cd in the plant shoot was found with the 50 Hz AC field. Significant accumulation and uptake of Cu in plant roots and shoots was found under both electrical treatments

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The effects of direct electric current on the viability and metabolism of acidophilic bacteria

Cited by 82 publications

References 20 publications

Effect of Direct Electric Current on the Cell Surface Properties of Phenol-Degrading Bacteria

Effect of Direct Electric Current on the Cell Surface Properties of Phenol-Degrading Bacteria

A Review Article: Electrokinetic Bioremediation Current Knowledge and New Prospects

Alternating current electrical field effects on lettuce (Lactuca sativa) growing in hydroponic culture with and without cadmium contamination

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