Effect of electric current on growth and alcohol production by yeast cells

Nakanishi, Kotoyoshi; Tokuda, Hiroharu; Soga, Takahiko; Yoshinaga, Takahiro; Takeda, Masayuki

doi:10.1016/s0922-338x(97)86778-5

Cited by 59 publications

(31 citation statements)

References 8 publications

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“…In agreement with our work, previous studies (11,12,13,14,37) have linked enhanced microbial metabolism in the BES. Longterm electrical application resulted in selection of salt-adapted and specific p-FNB-mineralizing microorganisms in the BES.…”

supporting

confidence: 93%

“…Zhang et al (11) found that application of a fixed potential induced microbial oxidoreductase production for electron transfer when 2,4-dichlorophenoxyacetic acid was biologically degraded. In agreement, electrical stimulation has been also shown to spur microbial growth (12) and enhance the cell density (13). The cell density of the bacterium Enterobacter dissolvens was found to be significantly improved and microbial activity was increased 2-fold (14).…”

mentioning

confidence: 61%

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Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Feng

Zhang

Guo

et al. 2015

Appl Environ Microbiol

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cFed batch bioelectrochemical systems (BESs) based on electrical stimulation were used to treat p-fluoronitrobenzene (p-FNB) wastewater at high salinities. At a NaCl concentration of 40 g/liter, p-FNB was removed 100% in 96 h in the BES, whereas in the biotic control (BC) (absence of current), p-FNB removal was only 10%. By increasing NaCl concentrations from 0 g/liter to 40 g/liter, defluorination efficiency decreased around 40% in the BES, and in the BC it was completely ceased. p-FNB was mineralized by 30% in the BES and hardly in the BC. Microorganisms were able to store 3.8 and 0.7 times more K ؉ and Na ؉ intracellularly in the BES than in the BC. Following the same trend, the ratio of protein to soluble polysaccharide increased from 3.1 to 7.8 as the NaCl increased from 0 to 40 g/liter. Both trends raise speculation that an electrical stimulation drives microbial preference toward K ؉ and protein accumulation to tolerate salinity. These findings are in accordance with an enrichment of halophilic organisms in the BES. Halobacterium dominated in the BES by 56.8% at a NaCl concentration of 40 g/liter, while its abundance was found as low as 17.5% in the BC. These findings propose a new method of electrical stimulation to improve microbial salinity resistance.O rganofluorine compounds, especially fluorinated aromatic compounds, are widely used in the production of adhesives, pesticides, dyes, pharmaceuticals, refrigerants, and surfactants (1). They were found to inhibit enzymes, modify cell-to-cell communication, and disrupt membrane transport as well as energy generation processes (2). Due to their high toxicity and recalcitrance, conventional biological methods fail to efficiently remove organofluorine from wastewaters (1, 3). On the other hand, bioelectrochemical treatment has been proved to be an effective method to minimize refractory properties of typical p-fluoronitrobenzene-contaminated organofluorine wastewater (4).Salinity poses another serious challenge to the treatment of such organofluorine-containing wastewater. Typically, addition of strong acid or alkali to adjust the pH during production processes results in high salt concentrations in organofluorine wastewaters. As an example, salinity concentrations from an organofluorine industry effluent in China typically fluctuate between 2 and 3%, with a maximum of 5%. Conventional physicochemical treatment processes for salinity wastewater are energy intensive and costly. Although biological processes have been recommended for salinity wastewater treatment (5, 6), high salinity may cause cell plasmolysis and even the death of microorganisms due to osmotic pressure increases (7,8). To address this issue, wastewaters are always diluted, which results in a meaningless freshwater consumption and increases operational cost (5). An enhancement of microbial salinity resistance would enable implementation of biological methods for salinity wastewater treatment, which could be succeeded by acclimatization and enrichment of haloduric or halophilic strains (5). H...

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supporting

confidence: 93%

mentioning

confidence: 61%

Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Feng

Zhang

Guo

et al. 2015

Appl Environ Microbiol

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“…This inhibitory effect may be due to the high biochemical oxygen demand (BOD) of RHP and the presence of cell wall cations and some toxic materials. In addition, cell growth was inhibited by increasing concentrations of dissolved carbon dioxide and significantly affected by the concentration of dissolved oxygen [41]. These results suggested that RHP above 4% had a negative effect on the cell growth rate.…”

Section: Resultsmentioning

confidence: 88%

Ram horn peptone as a source of citric acid production by Aspergillus niger, with a process

Kurbanoğlu

2004

J IND MICROBIOL BIOTECHNOL

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The present study deals with the production of citric acid from a ram horn peptone (RHP) by Aspergillus niger NRRL 330. A medium from RHP and a control medium (CM) were compared for citric acid production using A. niger in a batch culture. For this purpose, first, RHP was produced. Ram horns were hydrolyzed by treatment with acids (6 N H(2)SO(4), 6 N HCl) and neutralizing solutions. The amounts of protein, nitrogen, ash, some minerals, total sugars, total lipids and amino acids of the RHP were determined. RHP was compared with peptones with a bacto-tryptone from casein and other peptones. The results from RHP were similar to those of standard peptones. The optimal concentration of RHP for the production of citric acid was found to be 4% (w/w). A medium prepared from 4% RHP was termed ram horn peptone medium (RHPM). In comparison with CM, the content of citric acid in RHPM broth (84 g/l) over 6 days was 35% higher than that in CM broth (62 g/l). These results show that citric acid can be produced efficiently by A. niger from ram horn.

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“…This inhibiting effect may be due to the high biochemical oxygen demand (BOD) load of RHH and toxic materials (Kadioglu & Algur, 1992). Similar effects have been observed from various effluents with high loads of organic and inorganic materials (Nakanishi, Tokuda, Soga, Yoshinaga, & Takeda, 1998). Therefore, we continued the subsequent research with 2% RHH.…”

Section: Resultsmentioning

confidence: 62%

Utilization of ram horn hydrolysate as a supplement for recovery of heat- and freeze-injured bacteria

Kurbanoğlu

Algur

2006

Food Control

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Effect of electric current on growth and alcohol production by yeast cells

Cited by 59 publications

References 8 publications

Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Ram horn peptone as a source of citric acid production by Aspergillus niger, with a process

Utilization of ram horn hydrolysate as a supplement for recovery of heat- and freeze-injured bacteria

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