Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Lu, Anhuai; Li, Yan; Jin, Song; Wang, Xin; Wu, Xiao‐Lei; Zeng, Cuiping; Ding, Haiyang; Hao, Ruixia; Lv, Mingyang; Wang, Changqiu; Tang, Yue‐Qin; Dong, Hailiang

doi:10.1038/ncomms1768

Cited by 142 publications

(80 citation statements)

References 48 publications

(39 reference statements)

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“…A. faecalis ATCC 8750 was reported previously to be unable to reduce nitrate (23,24,25). Our studies revealed that A. faecalis could reduce nitrate and nitrite under aerobic conditions with electrodes as the electron donor, and the current densities were low (Ͻ0.02 mA/cm 2 ).Our previous study showed that a chemoautotrophic bacterium, Acidithiobacillus ferrooxidans, utilized the cathode as an electron donor for growth (4), and A. faecalis had a good response to semiconducting mineral photoelectrons (4). The potential ability of A. faecalis to directly use external electrons from semiconducting minerals will help us to understand the synergism between microbes and semiconducting minerals in natural environments.…”

mentioning

confidence: 59%

“…For nitrite and nitrate reduction in batch cultivation aerobically and anaerobically, the medium was a simple basic medium containing the following: K 2 HPO 4 In the poised potential experiment, the simple basic mineral medium described above was applied but without sodium citrate. The microbial electronic reduction of nitrate and nitrite was conducted in a dual-chamber device.…”

Section: Methodsmentioning

confidence: 99%

“…A. faecalis was believed to have high affinity to photoelectrons derived from semiconducting mineral photocatalysis (4). In Lu's previous study, this bacterium was a dominant species in soil when cultivated with photoelectrons (4).…”

Section: Nitrate and Nitrite Reduction Enhanced By Cathode In Besmentioning

confidence: 99%

“…Recent research by Lu et al revealed that A. faecalis might be able to use extracellular electrons from semiconducting mineral photocatalysis for metabolism (4). In their study, with photoelectrons A. faecalis gradually became the dominant species in the soil microbial community, indicating this bacterium might have a potential to utilize photoelectrons (4).…”

mentioning

confidence: 90%

“…Nevertheless, A. faecalis also had denitrification ability as the bacterium had a copper-containing nitrite reductase that catalyzes the reduction of nitrite (NO 2 Ϫ ) to nitric oxide (NO) (3). Recent research by Lu et al revealed that A. faecalis might be able to use extracellular electrons from semiconducting mineral photocatalysis for metabolism (4). In their study, with photoelectrons A. faecalis gradually became the dominant species in the soil microbial community, indicating this bacterium might have a potential to utilize photoelectrons (4).…”

mentioning

confidence: 99%

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Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Wang

Zeng

et al. 2015

Appl Environ Microbiol

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bThe utilization by Alcaligenes faecalis of electrodes as the electron donor for denitrification was investigated in this study. The denitrification rate of A. faecalis with a poised potential was greatly enhanced compared with that of the controls without poised potentials. For nitrate reduction, although A. faecalis could not reduce nitrate, at three poised potentials of ؉0.06, ؊0.06, and ؊0.15 V (versus normal hydrogen electrode [NHE]), the nitrate was partially reduced with ؊0.15-and ؊0.06-V potentials at rates of 17.3 and 28.5 mg/liter/day, respectively. The percentages of reduction for ؊0.15 and ؊0.06 V were 52.4 and 30.4%, respectively. Meanwhile, for nitrite reduction, the poised potentials greatly enhanced the nitrite reduction. The nitrite reduction rates for three poised potentials (؊0.06, ؊0.15, and ؊0.30 V) were 1.98, 4.37, and 3.91 mg/liter/h, respectively. When the potentials were cut off, the nitrite reduction rate was maintained for 1.5 h (from 2.3 to 2.25 mg/liter/h) and then greatly decreased, and the reduction rate (0.38 mg/liter/h) was about 1/6 compared with the rate (2.3 mg/liter/h) when potential was on. Then the potentials resumed, but the reduction rate did not resume and was only 2 times higher than the rate when the potential was off.A lcaligenes faecalis is a Gram-negative heterotrophic bacterium that is common in soil (1). A. faecalis was reported to aerobically produce nitrite (NO 2 Ϫ ), nitrate, nitric oxide (NO), and nitrous oxide in both peptone-meat extract and defined media with ammonium and citrate as the sole nitrogen and carbon sources (2). Nevertheless, A. faecalis also had denitrification ability as the bacterium had a copper-containing nitrite reductase that catalyzes the reduction of nitrite (NO 2 Ϫ ) to nitric oxide (NO) (3). Recent research by Lu et al. revealed that A. faecalis might be able to use extracellular electrons from semiconducting mineral photocatalysis for metabolism (4). In their study, with photoelectrons A. faecalis gradually became the dominant species in the soil microbial community, indicating this bacterium might have a potential to utilize photoelectrons (4).The interaction between microbes and solid minerals is becoming a worldwide hot spot in the field of geomicrobiology, an interdisciplinary field involving geology and microbiology. Especially, the electron flows between microbes and minerals (or electrodes) are a major research interest in this field. Currently, the models of microbes donating electrons to minerals (or electrodes) are categorized into three types: direct contact, electron shuttle, and microbial extracellular appendages (5). Direct contact between cells and the electrode surface will no doubt facilitate the electron exchanges (6). Under some circumstances, the environmental chemicals or microbially secreted chemicals could act as an electron shuttle, transferring electrons via redox reactions (7,8). Besides secreting chemical compounds, some bacteria have evolved extracellular structures, the conductive flagella called "nanowir...

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confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: Nitrate and Nitrite Reduction Enhanced By Cathode In Besmentioning

confidence: 99%

mentioning

confidence: 90%

mentioning

confidence: 99%

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Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Wang

Zeng

et al. 2015

Appl Environ Microbiol

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Effects of simulated spring thaw of permafrost from mineral cryosol on CO₂ emissions and atmospheric CH₄ uptake

et al. 2015

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Previous studies investigating organic-rich tundra have reported that increasing biodegradation of Arctic tundra soil organic carbon (SOC) under warming climate regimes will cause increasing CO 2 and CH 4 emissions. Organic-poor, mineral cryosols, which comprise 87% of Arctic tundra, are not as well characterized. This study examined biogeochemical processes of 1 m long intact mineral cryosol cores (1-6% SOC) collected in the Canadian high Arctic. Vertical profiles of gaseous and aqueous chemistry and microbial composition were related to surface CO 2 and CH 4 fluxes during a simulated spring/summer thaw under light versus dark and in situ versus water saturated treatments. CO 2 fluxes attained 0.8 ± 0.4 mmol CO 2 m À2 h À1 for in situ treatments, of which 85 ± 11% was produced by aerobic SOC oxidation, consistent with field observations and metagenomic analyses indicating aerobic heterotrophs were the dominant phylotypes. The Q 10 values of CO 2 emissions ranged from 2 to 4 over the course of thawing. CH 4 degassing occurred during initial thaw; however, all cores were CH 4 sinks at atmospheric concentration CH 4 . Atmospheric CH 4 uptake rates ranged from À126 ± 77 to À207 ± 7 nmol CH 4 m À2 h À1 with CH 4 consumed between 0 and 35 cm depth.Metagenomic and gas chemistry analyses revealed that high-affinity Type II methanotrophic sequence abundance and activity were highest between 0 and 35 cm depth. Microbial sulfate reduction dominated the anaerobic processes, outcompeting methanogenesis for H 2 and acetate. Fluxes, microbial community composition, and biogeochemical rates indicate that mineral cryosols of Axel Heiberg Island act as net CO 2 sources and atmospheric CH 4 sinks during summertime thaw under both in situ and water saturated states.

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Plasmon‐Enhanced Photocatalysis on Anisotropic Gold Nanorod Arrays

et al. 2013

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The field of photocatalysis is an active area owing to the possible contributions to solve some challenging problems such as sustainable energy production, environmental pollution control, and even global warming. Unfortunately, traditional photocatalysts, especially semiconductors, suffer from inherent deficiencies, which include high activation barriers, the low mobility of charge carriers, and poor long‐term stabilities. Herein, we demonstrate a plasmonic photocatalyst based on unidirectional gold nanorod arrays fabricated by using the oblique‐angle deposition (OAD) technique. The fabricated gold nanorod arrays exhibit a remarkable plasmonic anisotropy, which depends on the direction of the incoming light. By employing these arrays as a plasmonic catalyst, a clear improvement and control in the catalytic reduction of o‐nitroaniline to 1,2‐benzenediamine, depending on the directionalities and anisotropic plasmonic properties of the gold nanorods, was obtained. These results suggest that such unique characteristics of directional gold nanorod arrays could greatly impact several technological areas, not only in plasmon‐enhanced photocatalysis but in biosensing and optofluidic applications.

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Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Cited by 142 publications

References 48 publications

Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Effects of simulated spring thaw of permafrost from mineral cryosol on CO₂ emissions and atmospheric CH₄ uptake

Plasmon‐Enhanced Photocatalysis on Anisotropic Gold Nanorod Arrays

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Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Cited by 142 publications

References 48 publications

Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Effects of simulated spring thaw of permafrost from mineral cryosol on CO2 emissions and atmospheric CH4 uptake

Plasmon‐Enhanced Photocatalysis on Anisotropic Gold Nanorod Arrays

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Effects of simulated spring thaw of permafrost from mineral cryosol on CO₂ emissions and atmospheric CH₄ uptake