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In mitochondria, the detoxification of molar excess H2S as polysulfide proceeded via an oxidation process promoted by Cu/Zn containing superoxide dismutase (SOD1) enzyme, which has been very recently reported as the alternative enzyme for cytosolic H2S oxidation. Herein, we present Ni(II) complexes bearing the terminal SH group as a synthetic functional analogue for the sulfide oxidase function of SOD1. Synthesis, crystal structure and complete spectroscopic characterization of two sets of complexes, [NiLOMe/tBu(PPh3)] (2OMe/tBu) and tetraethyl salt of [NiLOMe/tBu(SH)]−1 (3OMe/tBu), were described (LOMe = (E)-2-methoxy-6-(((2-sulfidophenyl)imino)methyl)phenolate and LtBu = (E)-2,4-di-tert-butyl-6-(((2-sulfidophenyl)imino)methyl)phenolate). Under anaerobic conditions, 3OMe/tBu responded to a catalytic sulfur atom transfer (SAT) reaction with PPh3 to produce SPPh3. The SAT reaction was analyzed using detailed studies of 1H and 31P NMR spectra. Finally, the SAT reactivity pattern was compared with the same in the native enzyme of SOD1. [ABSTRACT FROM AUTHOR]

AbstractIncreasing industrialization and urbanization have contributed to a significant rise in wastewater discharge and exerted extensive pressure on the existing natural energy resources. Microbial fuel cell (MFC) is a sustainable technology that utilizes wastewater for electricity generation. MFC comprises a bioelectrochemical system employing electroactive biofilms of several aerobic and anaerobic bacteria, such as Geobacter sulfurreducens, Shewanella oneidensis, Pseudomonas aeruginosa, and Ochrobacterum pseudiintermedium. Since the electroactive biofilms constitute a vital part of the MFC, it is crucial to understand the biofilm-mediated pollutant metabolism and electron transfer mechanisms. Engineering electroactive biofilm communities for improved biofilm formation and extracellular polymeric substances (EPS) secretion can positively impact the bioelectrochemical system and improve fuel cell performance. This review article summarizes the role of electroactive bacterial communities in MFC for wastewater treatment and bioelectricity generation. A significant focus has been laid on understanding the composition, structure, and function of electroactive biofilms in MFC. Various electron transport mechanisms, including direct electron transfer (DET), indirect electron transfer (IET), and long-distance electron transfer (LDET), have been discussed. A detailed summary of the optimization of process parameters and genetic engineering strategies for improving the performance of MFC has been provided. Lastly, the applications of MFC for wastewater treatment, bioelectricity generation, and biosensor development have been reviewed. [ABSTRACT FROM AUTHOR]

Although many studies have proclaimed the potential benefits of blockchain technology for supply chain traceability, there are very few examples of successfully scaled blockchain traceability solutions. Here, we examine the challenges in adopting blockchain-based traceability solutions using the case of a complex globally fragmented industry—the fragrance sector. Fragrances are used in a vast number of products. Leading brands make substantial claims about the origin, production methods, certifications and environmental and social sustainability of the fragrances in their products. We categorize the types of traceability-related claims made and examine the potential use of blockchain to support them. The industry exemplifies the challenges in ensuring supply chain traceability in globally dispersed supply chains. The research highlights the potential of blockchain-based traceability solutions but identifies four major challenges—bringing together supply chain partners for a blockchain initiative, disclosing and sharing more information than is common in buyer-supplier relationships, ensuring information encoded on a blockchain provides an accurate record of a product's journey through the supply chain and involving parties such as regulatory and industry bodies in blockchain initiatives. The challenges identified are reflected in supply chains that are fragmented and globally dispersed, showing why the uptake of blockchain-based traceability has been limited in such sectors. [ABSTRACT FROM AUTHOR]