Influence of pulsed electric field on growths of soil bacteria and pepper plant

Seo, Ha Na; Jeon, Bo Young; Tran, Hung Thuan; Ahn, Dae‐Hwan; Park, Doo Hyun

doi:10.1007/s11814-010-0090-1

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…A low intensity electric pulse (7 mA/cm 2 or 40 mV/cm) inhibits development of the biofilm growing on a carbon electrode, slightly inactivates bacterial growth, but activates yeast metabolism for ethanol production [7,8]. Seo et al [9] applied a low intensity electric pulse (0.28 -0.3 V/cm) to farm field soil, and viable cell numbers of the soil bacterial community decreased significantly but bacterial diversity was not influenced. The influences of electric charge, electrically pulsed charges, or electrochemical redox reactions on growth or physiological variation of plants have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of a low-voltage electric pulse charged to culture soil on plant growth and variations of the bacterial community

Yi¹,

Choi²,

Jeon³

et al. 2012

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This study was conducted to verify the effect of an electric pulse on growth of crops (lettuce and hot pepper) that were cultivated in lab-scale soil. The electric pulse generated from direct-circuited 2, 4, 6, 8, and 10 V of electricity by periodic exchange of the anode and cathode was charged to a culture soil that is an electrically pulsed culture soil (EPCS) but not charged to a conventional culture soil (CCS). Growth of lettuce increased and growth duration of hot pepper plants was more prolonged at 4, 6, 8, and 10 V of EPCS than at 2 V of EPCS and CCS. The fruiting duration and yield of hot pepper fruits were proportional to the growth duration of the hot pepper plants. Temperature gradient gel electrophoresis (TGGE) patterns of 16S-rDNA obtained from the bacterial community inhabiting the CCS and EPCS were identical at the initial time and did not change significantly at days 28 and 56 of cultivation. The bacterial communities inhabiting the surface of lettuce roots were not influenced by the electric pulse but were significantly different from those inhabiting the culture soil based on the TGGE patterns. Growth of lettuce and hot pepper plants that were cultivated in 4 - 10 V of EPCS may increase; however, the bacterial community inhabiting the soil and the surface of plant roots may not be influenced by an electric pulse

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Section: Introductionmentioning

confidence: 99%

Effects of a low-voltage electric pulse charged to culture soil on plant growth and variations of the bacterial community

Yi¹,

Choi²,

Jeon³

et al. 2012

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“…The electrochemical oxidation-reduction reaction charged to bacterial culture is useful for the regulation of bacterial growth or metabolism [28]. Electrochemically reduced neutral red (NR) was determined to reduce NAD + to NADH directly without the need for enzyme catalysis [24], which is useful for the maintenance of NADH/NAD + balance during bacterial metabolism.…”

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Bioelectrochemical Mn(II) Leaching from Manganese Ore by Lactococcus lactis SK071115

Jeon

Park²

2011

J. Microbiol. Biotechnol.

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L. lactis sk071115 has been shown to grow more actively and generate lower levels of lactate in glucose-defined medium with nitrate than in medium with Mn(IV). By adding Mn(IV) to a L. lactis culture, lactate production was relatively reduced in combination with Mn(II) production, but cell mass production levels did not increase. Both cell-free extract and intact L. lactis cells reacted electrochemically with Mn(IV) but did not react with Mn(II) upon cyclic voltammetry using neutral red (NR) as an electron mediator. A modified graphite felt cathode with NR (NR-cathode) was employed to induce electrochemical reducing equivalence for bacterial metabolism. Cell-free L. lactis extract catalyzed the reduction of Mn(IV) to Mn(II) under both control and electrochemical reduction conditions; however, the levels of Mn(II) generated under electrochemical reduction conditions were approximately 4 times those generated under control conditions. The levels of Mn(II) generated by the catalysis of L. lactis immobilized in the NR-cathode (L-NR-cathode) under electrochemical reduction conditions were more than 4 times that generated under control conditions. Mn(II) production levels were increased by approximately 2.5 and 4.5 times by the addition of citrate to the reactant under control and electrochemical reduction conditions, respectively. The cumulative Mn(II) produced from manganese ore by catalysis of the L-NR-cathode for 30 days reached levels of approximately 3,800 and 16,000 mg/l under control and electrochemical reduction conditions, respectively. In conclusion, the electrochemical reduction reaction generated by the NR-cathode activated the biochemical reduction of Mn(IV) to Mn(II) by L. lactis.

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