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Laura Rago, Sarah Zecchin, Federica Villa, Andrea Goglio, Anna Corsini, Lucia Cavalca, Andrea Schievano
A new approach to microbial electrosynthesis is proposed, aimed at producing whole biomass from N2 and inorganic carbon, by electrostimulation of complex microbial communities. On a carbon-based conductor under constant polarization (-0.7 V vs SHE), an electroactive biofilm was enriched with autotrophic nitrogen fixing microorganims and led to biomass synthesis at higher amounts (up to 18 fold), as compared to controls kept at open circuit (OC). After 110 days, the electron transfer had increased by 30-fold, as compared to abiotic conditions...
October 16, 2018: Bioelectrochemistry
Jiasheng Wang, Ni Hui
Biocompatible materials, such as zwitterionic poly(carboxybetaine methacrylate) (polyCBMA), are of extraordinary importance in growth of bioelectronics and biosensors, because they not only greatly suppress nonspecific protein adsorption, but also have rich functional groups to facilitate the fixation of biological molecules. A novel nanocomposite was synthesized herein through modification polyCBMA onto conducting polymer polyaniline (PANI) nanowire surface. The prepared polyCBMA/PANI composite, integrating the good conductivity of PANI nanowires with the excellent antifouling capability of polyCBMA, provided a wonderful matrix for the growth of ultrasensitive and low fouling biosensor...
October 11, 2018: Bioelectrochemistry
Radislav A Potyrailo, Jon Dieringer, Victoria Cotero, Yongjae Lee, Steve Go, Matthew Schulmerich, Gunnar Malmquist, Andreas Castan, Klaus Gebauer, Vincent Pizzi
Biological cells are utilized for diverse biotechnological and bioengineering purposes ranging from the production of biopharmaceuticals, to cell therapy, "human-on-a-chip" drug and toxicology assays, and drug-resistance tests. In these and other applications, it is critical to quantify the levels of not only viable but also non-viable cells. While traditional off-line cell-staining methods are available for counting of non-viable cells, many applications cannot periodically remove cells for their off-line analysis because of the risk of contamination or workflow logistics...
October 10, 2018: Bioelectrochemistry
Yanpeng Lv, Yanfang Zhang, Boris Rubinsky
This study examined the temporal physiological and molecular events following the treatment of the liver with a tissue ablation modality that combined electroporation with electrolysis (E2). Rat liver was treated with an E2 waveform and the tissue examined, 1 h, 3 h, 6 h and 24 h with: H&E, Masson Trichrome, TUNEL stains and Western blot. H&E and TUNEL stains have shown that cell death began to be evident 3 h and hepatocyte regeneration was seen 24 h after treatment. H&E and Masson trichrome have shown that the extracellular matrix and the large lumens, appeared intact after E2...
September 30, 2018: Bioelectrochemistry
Hassiba Smida, Estelle Lebègue, Meritxell Cortes, Jean-François Bergamini, Frédéric Barrière, Corinne Lagrost
No abstract text is available yet for this article.
September 27, 2018: Bioelectrochemistry
Michael Schaefer, Martha-Maria Gebhard, Wolfgang Gross
We investigated isolated guinea pig hearts (n = 121) in an ischemia/ reperfusion model with the aim to compare the efficiency of the cardioplegic solution HTK with its novel replacement HTKN. Following consolidation with Tyrode's solution, ischemia started either immediately or after preceding cardioplegia with HTK, HTKN, or modified HTK enriched with Ca. Ischemia lasted either 80 min at 30 °C, or 360 min at 5 °C, or 81 min at 30 °C with intermittent cardioplegic perfusion. During ischemia we measured intracellular calcium (iCa++ ) and the time of gap junction uncoupling (t-in)...
September 20, 2018: Bioelectrochemistry
Yue Yi, Beizhen Xie, Ting Zhao, Zhaoming Li, Devard Stom, Hong Liu
The relatively poor sensitivity is the main bottleneck restricting the application of microbial fuel cell biosensor (MFC-biosensor) for toxicity monitoring. Previous studies have shown that external resistance (Rext ) had an obvious effect on sensor sensitivity. However, these studies reported different results and the reason of this discrepancy was not clear. The objective of this research was to observe the effect of Rext on sensor sensitivity when detecting different types of pollutants and reveal its microbiological mechanism...
September 17, 2018: Bioelectrochemistry
Mir Reza Majidi, Fatemeh Shahbazi Farahani, Mirghasem Hosseini, Iraj Ahadzadeh
In this work, low cost α-MnO2 nanowires and α-MnO2 nanowires supported on carbon Vulcan (α-MnO2 /C) have been synthesized via a simple and facile hydrothermal method for application in microbial fuel cells. The prepared samples have been characterized by X-ray diffraction (XRD), Raman spectroscopy and field emission scanning electron microscopy (FE-SEM). Electrocatalytic activities of the samples have been evaluated by means of cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) in a neutral phosphate buffer solution...
September 15, 2018: Bioelectrochemistry
Shi-Gang Su, Hao-Yi Cheng, Ting-Ting Zhu, Hong-Cheng Wang, Ai-Jie Wang
Nitrate is one of the most common pollutants in the water environment. A key factor for the effective control and removal of nitrate is the ability to accurately determine the nitrate concentration in groundwater and the secondary effluent of wastewater treatment plants. Here, a bioelectrochemical method for real-time detection of the nitrate was developed. In this work, a kinetic model was developed to describe the correlation between the nitrate concentration and the current. Standard addition experiments showed the relative error between indicator predictions and ion chromatographic values ranged from 3...
September 15, 2018: Bioelectrochemistry
Alexander G Volkov
The Venus flytrap captures insects with one of the most rapid movements in the plant kingdom. There is a significant difference between properties of electrical signals generated in the Venus flytrap described in literature. Amplitudes of action potentials vary from 14 mV to 200 mV with duration of signals from 2 ms to 10 s. Here we present experimental study of potential differences between Ag/AgCl electrodes inserted to the trap, petiole, and into soil or external ECG electrodes attached to surfaces of the Venus flytrap...
September 5, 2018: Bioelectrochemistry
Paola Brun, Monica Dettin, Luca Giovanni Campana, Fabrizio Dughiero, Paolo Sgarbossa, Clara Bernardello, Anna Lisa Tosi, Annj Zamuner, Elisabetta Sieni
Electroporation of cells is usually studied using cell suspensions or monolayer cultures. 3D scaffolds for cell culture have been recently designed in order to reproduce in vitro the complex and multifactorial environment experimented in vivo by cells. In fact, it is well known that 2D cell cultures are not able to simulate the complex interactions between the cells and their extracellular matrix (ECM). Recently, some examples of 3D models, like spheroids, have been investigated also in the electroporation field...
August 30, 2018: Bioelectrochemistry
Filipa O Gomes, Luísa B Maia, Cristina Cordas, Isabel Moura, Cristina Delerue-Matos, José J G Moura, Simone Morais
Understanding the direct electron transfer processes between redox proteins and electrode surface is fundamental to understand the proteins mechanistic properties and for development of novel biosensors. In this study, nitric oxide reductase (NOR) extracted from Marinobacter hydrocarbonoclasticus bacteria was adsorbed onto a pyrolytic graphite electrode (PGE) to develop an unmediated enzymatic biosensor (PGE/NOR)) for characterization of NOR direct electrochemical behaviour and NOR electroanalytical features towards NO and O2 ...
August 21, 2018: Bioelectrochemistry
Alexander G Volkov, Yuri B Shtessel
According to literature, electrostimulation of plants can induce plant movement, activation of ion channels, ion transport, gene expression, enzymatic system activation, electrical signaling, plant-cell damage, enhanced wound healing, and can also influence plant growth. Many plants can communicate above ground and underground between adjacent plants. Electrostimulation by square pulses induces passive electrotonic potentials propagating within and between tomato plants. The amplitude and sign of electrotonic potentials, in both the electrostimulated and neighboring tomato plants depends on the amplitude, rise and fall of the applied voltage...
December 2018: Bioelectrochemistry
Stéphane Pinck, Mengjie Xu, Romain Clement, Elisabeth Lojou, Frédéric P A Jorand, Mathieu Etienne
An electroactive artificial biofilm has been optimized for the cathodic reduction of fumarate by Shewanella oneidensis. The system is based on the self-assembly of multi-walled carbon nanotubes with bacterial cells in the presence of a c-type cytochrome. The aggregates are then deposited on an electrode to form the electroactive artificial biofilm. Six c-type cytochromes have been studied, from bovine heart or Desulfuromonas and Desulfuvibrio strains. The isoelectric point of the cytochrome controls the self-assembly process that occurs only with positively-charged cytochromes...
December 2018: Bioelectrochemistry
Saleheh Abbasi, Ali Benvidi, Sajjad Gharaghani, Masoud Rezaeinasab
Thymol (Thy) is a hydrophobic active ingredient present in thyme essential oils. It is marginally soluble in water which is one of the challenging limitations for its application in foods or as drugs. An important aspect of our understanding from this system is to quantitatively comprehend how albumin interacts with Thy. Herein, this study has been focused on the interactions between thymol and bovine serum albumin (BSA) using electrochemical methods and ultraviolet and visible (UV-Vis) spectroscopy. Due to the overlap between obtained signals of existing species, it is apparent that multivariate methods can resolve overlapping signal trough unique decomposition...
December 2018: Bioelectrochemistry
Maryam Hosseini Ghalehno, Mohammad Mirzaei, Masoud Torkzadeh-Mahani
In this work an electrochemical label free DNA biosensor (ds-DNA) for the determination of menadione (MD) was developed. The biosensor was constructed using a modified nanocomposite consisting of Fe3 O4 nanoparticles decorated reduced graphene oxide (Gr) on a carbon paste electrode (CPE). Scanning electron microscope (SEM), energy dispersive X-ray (EDAX) and Fourier transform infrared (FT-IR) spectroscopy confirmed the structure of the synthesized nanocomposites (electrode composition). The Gr-Fe3 O4 nanocomposites formed a sensitive layer with large surface area...
December 2018: Bioelectrochemistry
Akhil Saxena, Dwarika Prasad, Rajesh Haldhar
The corrosion inhibition nature of Cuscuta reflexa fruit extract, belonging to the family of Piperaceae, has been analyzed on mild steel in 0.5 M H2 SO4 with the help of weight loss studies, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. The C. reflexa extract contains 3‑methoxy‑3,4,5,7‑tetrahydroxy flavone, which decreases the corrosion rate of mild steel in acidic medium. The maximum corrosion inhibition efficiency was observed at 500 mg/L inhibitor concentration...
December 2018: Bioelectrochemistry
D Zouraris, M Dimarogona, A Karnaouri, E Topakas, A Karantonis
MtLPMO9 and FoLPMO9 are two lytic polysaccharide monooxygenases (LPMOs), from the filamentous fungi Thermothelomyces thermophila and Fusarium oxysporum, respectively. In the present study an attempt has been made to achieve direct electron transfer between these enzymes and a glassy carbon electrode by immobilization in Nafion polyelectrolyte. The method used to ascertain the feasibility of direct electron transfer was large amplitude Fourier transform alternating current voltammetry (FTacV) and the formal potentials of these enzymes were determined at different temperatures...
December 2018: Bioelectrochemistry
Ainara Domínguez-Garay, Abraham Esteve-Núñez
Microbial Electrochemical Systems can be setup in soil either for the harvesting of energy from microbial metabolism (sediment microbial fuel cell, SMFC) or for the bioremediation of polluted environments (Microbial Electroremediating Cell, MERC). However, the precieved need for this technology to be located in flooded environments, to assure the ionic contact between anode and cathode, has limited its implementation in standard soils. This work describes a new configuration that overcomes this limitation by integrating an out-of-soil cathodic chamber with a ceramic barrier so a closed circuit system can be achieved without flooding the soil...
December 2018: Bioelectrochemistry
Marcin Kruszewski, Magdalena Kusaczuk, Joanna Kotyńska, Miroslav Gál, Rafał Krętowski, Marzanna Cechowska-Pasko, Monika Naumowicz
Quercetin is a naturally-occurring flavonoid claimed to exert many beneficial health effects. In this report, the influence of quercetin on the surface charge of phosphatidylcholine liposomes and human glioblastoma LN-229 and LN-18 cells was studied using microelectrophoretic mobility measurements. The effect of quercetin on the electrical resistance and capacitance of bilayer lipid membranes was analyzed via electrochemical impedance spectroscopy. The results showed that after flavonoid treatment, the cell lines demonstrated changes in surface charge only in alkaline pH solutions, whereas there were no significant alterations in quercetin-treated vs...
December 2018: Bioelectrochemistry
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