Electrogenicity of microbial biofilms of medically relevant microorganisms: potentiometric, amperometric and wireless detection.

Since the progression of biofilm formation is related to the success of infection treatment, detecting microbial biofilms is of great interest. Biofilms of Gram-positive Staphylococcus aureus and Streptococcus gordonii bacteria, Gram-negative Pseudomonas aeruginosa and Escherichia coli bacteria, and Candida albicans yeast were examined using potentiometric, amperometric, and wireless readout modes in this study. As a biofilm formed, the open circuit potential (OCP) of biofilm hosting electrode (bioanode) became increasingly negative.

Improving NonViral Gene Delivery Using MHz Bursts of Nanosecond Pulses and Gold Nanoparticles for Electric Field Amplification.

Gene delivery by the pulsed electric field is a promising alternative technology for nonviral transfection; however, the application of short pulses (i.e., nanosecond) is extremely limited.

Antimicrobial particles based on CuZnSnS monograins.

In this research, CuZnSnS (CZTS) particles were successfully fabricated via the molten salt approach from the copper, zinc and tin sulphides as raw precursors. SEM analysis revealed that CZTS particles are tetragonal-shaped with sharp edges, smooth flat plane morphology, and crystal size varying from 10.8 to 28.

Assessment of Bacteria as a Potential Biocatalyst for Microbial Biofuel Cell Design.

The development of microbial fuel cells based on electro-catalytic processes is among the novel topics, which are recently emerging in the sustainable development of energetic systems. Microbial fuel cells have emerged as unique biocatalytic systems, which transform the chemical energy accumulated in renewable organic fuels and at the same time reduce pollution from hazardous organic compounds. However, not all microorganisms involved in metabolic/catalytic processes generate sufficient redox potential.

Glucose-to-Resistor Transduction Integrated into a Radio-Frequency Antenna for Chip-less and Battery-less Wireless Sensing.

To maximize the potential of 5G infrastructure in healthcare, simple integration of biosensors with wireless tag antennas would be beneficial. This work introduces novel glucose-to-resistor transduction, which enables simple, wireless biosensor design. The biosensor was realized on a near-field communication tag antenna, where a sensing bioanode generated electrical current and electroreduced a nonconducting antenna material into an excellent conductor.

Microbial Fuel Cell Based on Nitrogen-Fixing Bacteria.

In this study, the nitrogen-fixing, Gram-negative soil bacteria was successfully utilized as the main biocatalyst in a bacteria-based microbial fuel cell (MFC) device. This research investigates the double-chambered, H-type -based MFC that was operated in modified Norris medium (pH = 7) under ambient conditions using potassium ferricyanide as an electron acceptor in the cathodic compartment. The designed MFC exhibited an open-circuit voltage (OCV) of 635 mV and a power output of 1.

Highly efficient antimicrobial agents based on sulfur-enriched, hydrophilic molybdenum disulfide nano/microparticles and coatings functionalized with palladium nanoparticles.

In this research the molybdenum disulfide (MoS)-based nano/microparticles and coatings were synthesized through a simple, one-step hydrothermal approach without any other additives. Composition, structure, and morphology of the synthesized MoS-based materials were investigated using ultraviolet-visible spectroscopy (UV-Vis), inductively coupled plasma optical emission spectrometry (ICP-OES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX) techniques. The fabricated materials exhibited relatively small (Δθ = 18.

Ultra-small methionine-capped Au/Au nanoparticles as efficient drug against the antibiotic-resistant bacteria.

In this study we examined the influence of ultra-small gold and magnetite‑gold nanoparticles (NPs) stabilized with d,l-methionine, FeO@Au@Met, on their antibacterial efficacy against three of twelve the worst bacterial family members included in the World Health Organization (WHO) list. In particular, gram-negative Acinetobacter baumannii, Salmonella enterica and gram-positive methicillin-resistant Staphylococcus aureus and Micrococcus luteus were tested. Apart from the synthesis, gold species reduction and NP stabilization, an excess of methionine has been used herein to detach ultra-small gold NPs from the FeO@Au@Met surface, collect them and investigate.

Laser Light Induced Transformation of Molybdenum Disulphide-Based Nanoplatelet Arrays.

One-pot hydrothermal synthesis of MoS nanoplatelet arrays on various substrates is perhaps the most promising approach to fabricate efficient electrocatalysts for hydrogen evolution reaction. However, the main challenges in this synthesis remain the purity and crystallinity of MoS. In this study, we show for the first time that irradiation of amorphous, defect-rich MoS nanoplatelets with a green nanosecond laser at a proper irradiation dose, ca ≤0.