Inhibition of AHL-mediated quorum sensing to control biofilm thickness in microbial fuel cell by using Rhodococcus sp. BH4

Taşkan, Banu; Taşkan, Ergin

doi:10.1016/j.chemosphere.2021.131538

Cited by 46 publications

(18 citation statements)

References 91 publications

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“…It was found that increases in Rhodococcus concentrations led to a reduction of the anode biofilm thickness and an abundance of dead bacteria. The best electrochemical activity (1924 mW m −2 ) was in an MFC with a biofilm thickness of 26 μm at 40 mg, using Rhodococcus immobilized in 10 mL sodium alginate [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production in Microbial Electrolysis Cells Based on Bacterial Anodes Encapsulated in a Small Bioreactor Platform

et al. 2022

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Microbial electrolysis cells (MECs) are an emerging technology capable of harvesting part of the potential chemical energy in organic compounds while producing hydrogen. One of the main obstacles in MECs is the bacterial anode, which usually contains mixed cultures. Non-exoelectrogens can act as a physical barrier by settling on the anode surface and displacing the exoelectrogenic microorganisms. Those non-exoelectrogens can also compete with the exoelectrogenic microorganisms for nutrients and reduce hydrogen production. In addition, the bacterial anode needs to withstand the shear and friction forces existing in domestic wastewater plants. In this study, a bacterial anode was encapsulated by a microfiltration membrane. The novel encapsulation technology is based on a small bioreactor platform (SBP) recently developed for achieving successful bioaugmentation in wastewater treatment plants. The 3D capsule (2.5 cm in length, 0.8 cm in diameter) physically separates the exoelectrogenic biofilm on the carbon cloth anode material from the natural microorganisms in the wastewater, while enabling the diffusion of nutrients through the capsule membrane. MECs based on the SBP anode (MEC-SBPs) and the MECs based on a nonencapsulated anode (MEC control) were fed with Geobacter medium supplied with acetate for 32 days, and then with artificial wastewater for another 46 days. The electrochemical activity, chemical oxygen demand (COD), bacterial anode viability and relative distribution on the MEC-SBP anode were compared with the MEC control. When the MECs were fed with artificial wastewater, the MEC-SBP produced (at −0.6 V) 1.70 ± 0.22 A m−2, twice that of the MEC control. The hydrogen evolution rates were 0.017 and 0.005 m3 m−3 day−1, respectively. The COD consumption rate for both was about the same at 650 ± 70 mg L−1. We assume that developing the encapsulated bacterial anode using the SBP technology will help overcome the problem of contamination by non-exoelectrogenic bacteria, as well as the shear and friction forces in wastewater plants.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Production in Microbial Electrolysis Cells Based on Bacterial Anodes Encapsulated in a Small Bioreactor Platform

et al. 2022

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“…The abovementioned indicates the prospects of using Rhodococcus QQ in antimicrobial and antivirulence strategies. Additionally, the use of QQ is promising for the control of biofouling of membrane bioreactors as well as the anode in the microbial fuel cell used in wastewater treatment ( Oh et al, 2013 ; Iqbal et al, 2018 ; Lee et al, 2020 ; Taşkan and Taşkan, 2021 ; Güneş and Taşkan, 2022 ; Shah et al, 2022 ). The reduced ability to form biofilms and produce extracellular biopolymers enables a significantly enhanced wastewater treatment process, including removal of pharmaceuticals.…”

Section: Quorum-quenchingmentioning

confidence: 99%

Rhodococcus strains as a good biotool for neutralizing pharmaceutical pollutants and obtaining therapeutically valuable products: Through the past into the future

2022

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Active pharmaceutical ingredients present a substantial risk when they reach the environment and drinking water sources. As a new type of dangerous pollutants with high chemical resistance and pronounced biological effects, they accumulate everywhere, often in significant concentrations (μg/L) in ecological environments, food chains, organs of farm animals and humans, and cause an intense response from the aquatic and soil microbiota. Rhodococcus spp. (Actinomycetia class), which occupy a dominant position in polluted ecosystems, stand out among other microorganisms with the greatest variety of degradable pollutants and participate in natural attenuation, are considered as active agents with high transforming and degrading impacts on pharmaceutical compounds. Many representatives of rhodococci are promising as unique sources of specific transforming enzymes, quorum quenching tools, natural products and novel antimicrobials, biosurfactants and nanostructures. The review presents the latest knowledge and current trends regarding the use of Rhodococcus spp. in the processes of pharmaceutical pollutants’ biodegradation, as well as in the fields of biocatalysis and biotechnology for the production of targeted pharmaceutical products. The current literature sources presented in the review can be helpful in future research programs aimed at promoting Rhodococcus spp. as potential biodegraders and biotransformers to control pharmaceutical pollution in the environment.

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“…This was attributable to the accumulation of inactive cells accumulating over time within the inner layer, resulting in high diffusion resistance. A recent study sought to overcome low electron transfer rates induced by diffusion-limited thick biofilms via quorum quenching (QQ), which is the process of disrupting autoinductor-mediated quorum sensing (QS) in microbes (Taşkan & Taşkan, 2021 ). QQ allows for the control of QS-mediated biofilm formation and has been used in membrane bioreactors to control biofouling and increase membrane flux (Fakhri et al, 2021 ; Huang et al, 2019 ; Nahm et al, 2017 ; Oh & Lee, 2018 ).…”

Section: Biofilm-mediated Electron Transfer In Bioprocessingmentioning

confidence: 99%

Electroactive biofilms: how microbial electron transfer enables bioelectrochemical applications

Conners

Karthikeyan

Bose

2022

Journal of Industrial Microbiology and Biotechnology

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Microbial biofilms are ubiquitous. In marine and freshwater ecosystems, microbe-mineral interactions sustain biogeochemical cycles, while biofilms found on plants and animals can range from pathogens to commensals. Moreover, biofouling and biocorrosion represent significant challenges to industry. Bioprocessing is an opportunity to take advantage of biofilms and harness their utility as chassis for biocommodity production. Electrochemical bioreactors have numerous potential applications, including wastewater treatment and commodity production. The literature examining these applications has demonstrated that the cell-surface interface is vital to facilitating these processes. Therefore, it is necessary to understand the state of knowledge regarding biofilms’ role in bioprocessing. This mini-review discusses bacterial biofilm formation, cell-surface redox interactions, and the role of microbial electron transfer in bioprocesses. It also highlights some current goals and challenges with respect to microbe-mediated bioprocessing and future perspectives.

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Inhibition of AHL-mediated quorum sensing to control biofilm thickness in microbial fuel cell by using Rhodococcus sp. BH4

Cited by 46 publications

References 91 publications

Hydrogen Production in Microbial Electrolysis Cells Based on Bacterial Anodes Encapsulated in a Small Bioreactor Platform

Hydrogen Production in Microbial Electrolysis Cells Based on Bacterial Anodes Encapsulated in a Small Bioreactor Platform

Rhodococcus strains as a good biotool for neutralizing pharmaceutical pollutants and obtaining therapeutically valuable products: Through the past into the future

Electroactive biofilms: how microbial electron transfer enables bioelectrochemical applications

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