Article
Engineering, Environmental
Baogang Zhang, Jun Liu, Yizhi Sheng, Jiaxin Shi, Hailiang Dong
Summary: Research has shown that microbial communities in Cr(VI)-reducing groundwater bioreactors exhibit complex symbiotic relationships, coupling Cr(VI) reduction with other elemental cycles. The addition of iron significantly enhances Cr(VI) reduction rate and methane production, while sulfur is found to retard methane production by greatly slowing down acetoclastic methanogenesis.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Wanyi Liao, Qin Zhao, Shanshan Wang, Yiling Ran, Hong Su, Rong Gan, Shun Lu, Yan Zhang
Summary: The high energy consumption in water electrolysis systems is attributed to the slow kinetics of the oxygen evolution reaction (OER). Substituting thermodynamically advantageous small molecule oxidation reactions for OER can significantly improve energy conversion efficiency. Studying the in-depth reaction mechanism of complex substrates is necessary due to their elemental composition. This review focuses on the electrooxidation mechanism of different substrate molecules, such as ethanol, urea, and hydrazine, and introduces design ideas and strategies for high-performance electrocatalysts in relation to reaction path selectivity. The challenges in achieving industrial transformation in this field are also discussed.
JOURNAL OF CATALYSIS
(2023)
Article
Ecology
Ana Moya-Beltran, Simon Beard, Camila Rojas-Villalobos, Francisco Issotta, Yasna Gallardo, Ricardo Ulloa, Alejandra Giaveno, Mauro Degli Esposti, D. Barrie Johnson, Raquel Quatrini
Summary: Researchers conducted a systematic analysis of the genus Acidithiobacillus, defining 19 Acidithiobacillia lineages at different taxonomic levels. This study provides the most comprehensive classification and pangenomic analysis of this deep-branching class of Proteobacteria to date, shedding light on the evolutionary history and molecular evolution of relevant aerobic respiratory proteins.
Article
Microbiology
Toshiyuki Ueki, Trevor L. Woodard, Derek R. Lovley
Summary: This study developed a method for genetic manipulation of Desulfovibrio ferrophilus and found that it primarily reduces Fe(III) oxide through an electron shuttle. This finding not only helps to elucidate the mechanisms of D. ferrophilus, but also provides a new experimental approach for studying its other unique features.
MICROBIOLOGY SPECTRUM
(2022)
Article
Chemistry, Physical
Jifang Zhang, Qiyuan Lin, Zhenlei Wang, Haowen Liu, Xuanzhang Li, Yuegang Zhang
Summary: The study proposes that water oxidation on hematite can proceed via mixed reaction paths, contrary to the traditional assumption of a single reaction path. By isolating absorption signals of surface states responsible for water oxidation, the research highlights the significant contribution of direct hole transfer, especially for highly doped hematite. This finding challenges existing experimental techniques that rely on oversimplified models and theories.
Article
Geochemistry & Geophysics
Changle Wang, Leslie J. Robbins, Noah J. Planavsky, Nicolas J. Beukes, Laureline A. Patry, Stefan Lalonde, Maxwell A. Lechte, Dan Asael, Christopher T. Reinhard, Lianchang Zhang, Kurt O. Konhauser
Summary: This study provides new insights into Earth's early redox history and the processes leading to iron formation deposition. It suggests that the partial oxidation of Fe(II) played a central role in iron formation genesis, contradicting previous theories. It also indicates that oxygen production was relatively limited during the Archean, pointing to a model of restricted oxygen oases.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Review
Geosciences, Multidisciplinary
Guang-Hui Yu, Yakov Kuzyakov
Summary: Fenton reactions play a significant role in the decomposition of organic matter in soil, with the mechanisms depending on the sources and pathways of reactive oxygen species. These reactions are crucial for soil organic carbon cycling and can have a dual impact on OM mineralization and long-term carbon stabilization.
EARTH-SCIENCE REVIEWS
(2021)
Article
Microbiology
Rene L. Hoover, Jessica L. Keffer, Shawn W. Polson, Clara S. Chan
Summary: The pangenomic analysis of Gallionellaceae revealed a diverse genomic potential, with the presence of both iron-oxidizing bacteria and nitrite-oxidizing bacteria. Iron-oxidizing bacteria have a range of adaptations and mechanisms for extracellular electron uptake, enabling them to efficiently oxidize iron as their primary substrate.
Article
Microbiology
Jessica L. Keffer, Sean M. McAllister, Arkadiy I. Garber, Beverly J. Hallahan, Molly C. Sutherland, Sharon Rozovsky, Clara S. Chan
Summary: Iron (Fe) oxidation is a crucial biogeochemical process on Earth, with microbial iron oxidizers playing a significant role. Studies on Cyc2 in neutrophilic iron oxidizers suggest that it functions as an iron oxidase, providing new insights into the metabolism of these organisms. The presence of Cyc2 in a wide variety of iron oxidizers indicates its importance in iron oxidation processes.
Article
Chemistry, Multidisciplinary
Manuel Garcia Basallote, Carmen E. Castillo, Ilaria Gamba, Laia Vicens, Martin Clemancey, Jean-Marc Latour, Miquel Costas
Summary: This study investigates the kinetic generation of high-valent iron oxo complexes, revealing the pivotal role of substitution reactions in the process, and highlighting the significant impact of spin state on the reaction kinetics.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Biotechnology & Applied Microbiology
Nanqing Zhou, Jessica L. Keffer, Shawn W. Polson, Clara S. Chan
Summary: This study explored the physiology and gene expression of a facultative Fe(II)-oxidizing bacterium, revealing a direct connection between Fe(II) oxidation and carbon fixation.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Tahereh Jasemizad, Lev Bromberg, Lokesh P. Padhye
Summary: This study investigated the fate of aqueous betrixaban, an oral anticoagulant, during adsorption, photolysis, and advanced oxidation in the presence of radicals. The results showed that betrixaban can be efficiently removed using coconut shell-based granular activated carbon and that degradation rates can be enhanced by increasing H2O2 dosage, light intensity, and contact time. Hydroxyl radicals were identified as the major reactive species involved in the degradation process during the UV/H2O2 treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Materials Science, Ceramics
Emerson Luiz dos Santos Veiga, Xavier Vendrell Villafruela, Jordi Llorca, Hector Beltran-Mir, Eloisa Cordoncillo
Summary: Pyrochlore structures are promising candidates for heterogeneous catalysts in the oxidation reaction of CO to CO2. Higher iron concentrations result in better catalytic activity, and these samples are able to convert all CO oxidation reactions in a narrower temperature range.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Viktoriia M. Zemtsova, Alexandr G. Oshchepkov, Elena R. Savinova
Summary: This study investigates the influence of Fe3+ ions on the alkaline urea oxidation reaction on nickel, revealing that an increased concentration of Fe3+ ions in NaOH has a detrimental effect on the reaction products.
Article
Materials Science, Multidisciplinary
Huaizhuang Luan, Jie Chen, Rutie Liu, Xiang Xiong, Fangping Ouyang, Junhao Yang
Summary: Pre-sintered Fe-WC-Mo2C-Cr3C2-VC-C alloy was studied for its microstructure and evolution of internal pores during the exhaust process. The gas produced by deoxidation significantly affected the densification process, resulting in expansion and shrinkage of the pre-sintered sample. The oxygen content was significantly reduced after the carbothermal reaction.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Inorganic & Nuclear
Dusan Cocic, Aliya Manaa, Selina Siegl, Ralph Puchta, Rudi van Eldik
Summary: The study compared the encapsulation of alkaline and earth alkaline metal ions by two different Lehn-type cryptands, demonstrating their flexibility and selectivity. The evaluation of the host's ion selectivity and ability to adjust its structure to accommodate metal ions was based on energy and geometric criteria.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2021)
Article
Chemistry, Inorganic & Nuclear
Justyna Polaczek, Harishchandra Subedi, Lukasz Orzel, Lynn S. Lisboa, Ruth B. Cink, Grazyna Stochel, Nicola E. Brasch, Rudi van Eldik
Summary: The reaction between aquacobalamin/hydroxocobalamin and nitroxyl generated by Piloty's acid was studied over a wide pH range. It was found that in basic solutions, nitroxyl can react with hydroxocobalamin to form nitrosylcobalamin despite the inert nature of the compound. The rate-determining step in the reaction between hydroxocobalamin and nitroxyl changes depending on the concentration of Piloty's acid. Additionally, at neutral pH, rapid formation of CbINO was observed when Piloty's acid was stable and did not produce HNO.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Justyna Polaczek, Grazyna Stochel, Rudi van Eldik
Summary: The study focuses on the impact of air pollution particulate matter on physiological processes, particularly examining how different nanoparticles affect the rate of nitrosylcobalamin formation without altering the nature of the final product.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Environmental Sciences
Magdalena Mikrut, Wojciech Macyk, Rudi van Eldik, Grazyna Stochel
Summary: The study focuses on the chemical analysis of particulate matter collected in Krakow, Poland, revealing the presence of various elements such as calcium, magnesium, sulfur, silicon, and zinc, with copper, iron, and manganese in lower concentrations. SEM-EDS analysis shows differences in morphology between PM collected in urban and industrial areas, and the research is significant for understanding the impact of PM components on the development of immunological diseases under the APARIC project.
Article
Chemistry, Organic
Jelena Balovic, Dusan Cocic, Sladana Dordevic, Slavko Radenkovic, Rudi van Eldik, Ralph Puchta
Summary: Density functional calculations were used to study the conformational changes and enantiomerization pathway of a Lehn-type macrobicyclic polyether cryptate complex. The results revealed that ordered all-chiral pathways have lower energy compared to racemic pathways, helping to explain the observed fluxionality of the complex in experiments.
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Dusan Cocic, Biljana Petrovic, Ralph Puchta, Marta Chrzanowska, Anna Katafias, Rudi van Eldik
Summary: In this paper, water exchange reactions and substitution of aqua Ru-II complexes were investigated using conceptual density functional theory. The results highlight the significant influence of intermolecular hydrogen bonds.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Basam M. Alzoubi, Dusan Cocic, Ralph Puchta, Rudi Van Eldik
Summary: The study used density functional theory to investigate water exchange mechanisms on [Zn(L)H2O](2+)center dot H2O, revealing activation barriers for the water exchange reaction of 9.9, 10.13, and 11.23 kcal mol(-1). The results indicate an associative interchange pathway for water exchange.
JOURNAL OF COORDINATION CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Eman Soliman, Mohamed M. Ibrahim, Mohamed E. El-Khouly, Ibrahim El-Mehasseb, Abd El-Motaleb M. Ramadan, Magdy E. Mahfouz, Shaban Y. Shaban, Rudi van Eldik
Summary: Two zinc(II) complexes with (ZnN3S2) cores, DBZ and DBZH(4), effectively bind to BSA and the binding affinity depends on the ligand structure. Both complexes exhibit dynamic quenching at low concentrations and mixed quenching at high concentrations. Molecular docking shows that DBZ has higher energy for binding, consistent with antibacterial testing results.
Article
Engineering, Multidisciplinary
Esraa Ramzy, Mohamed M. Ibrahim, Ibrahim M. El-Mehasseb, Abd El-Motaleb M. Ramadan, Fawzia I. Elshami, Shaban Y. Shaban, Rudi van Eldik
Summary: In this study, it was found that NiBPA binds more strongly to DNA/protein and exhibits significant cytotoxicity and antibacterial activity. This suggests that NiBPA could have potential applications in medicine.
Review
Biochemistry & Molecular Biology
Mohamed M. M. Shoukry, Rudi van Eldik
Summary: This review article summarizes the equilibrium studies on Pd-amine complexes with bio-relevant ligands and their antitumor activity. Pd(II) complexes with amines of different functional groups were synthesized and characterized. The complex formation equilibria of Pd(amine)(2+) complexes with amino acids, peptides, dicarboxylic acids, and DNA constituents were extensively investigated. The stability of the formed complexes depends on the structural parameters of the amines and ligands, and the thermodynamic parameters reveal that the formation of the Pd(amine)(2+) complex species is exothermic.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Hanaa Mansour, Samia M. Elsigeny, Fawzia I. Elshami, Mohamed Auf, Shaban Y. Shaban, Rudi van Eldik
Summary: In this study, poly(AA-co-ACMO) and polyurethane-based nanofibers (NF11 and NF21) were prepared as antimicrobial carriers for chronic wound management. The characterization of the nanofibers revealed that poly(AA-co-ACMO) was mostly found on the surface of PU. Both NF11 and NF21 showed reversible binding to BSA in vitro, with NF21 exhibiting higher affinity and faster binding kinetics. The higher hydrophilicity of NF21 correlated with its more effective antibacterial properties compared to NF11.
Article
Biochemistry & Molecular Biology
Hadeer A. Shereef, Yasmine S. Moemen, Fawzia I. Elshami, Ahmed M. El-Nahas, Shaban Y. Shaban, Rudi van Eldik
Summary: This study aimed to evaluate the in vitro DNA binding mechanism of [RuNOTSP](+) and TSPH2, correlate the findings with cleavage activity and determine the impact of the metal center. Theoretical studies and biophysical techniques were used to examine the binding of [RuNOTSP](+) and TSPH2 to ctDNA. The results showed that both compounds effectively bind to ctDNA via intercalative/electrostatic interactions and that [RuNOTSP](+) has a greater DNA binding propensity than TSPH2. The study also revealed that cationic [RuNOTSP](+) is more effective at cleaving DNA compared to TSPH2.
Article
Biochemistry & Molecular Biology
Christopher Weinert, Dusan Cocic, Ralph Puchta, Rudi van Eldik
Summary: Using DFT-based computational chemistry calculations, the binding energies of noble gases encapsulated in dodecahedrane molecules were calculated to study their selectivity. It was found that Sn20H20 cage is best suited for noble gases with medium size radius, while Pb20H20 dodecahedrane cage is best for noble gases with larger radii. Bi-20 cage in the V main group showed the best results in selectively encapsulating Ar and Kr. The host cages demonstrated high rigidity and minimal flexibility, reflected in the high encapsulating energies.
Review
Chemistry, Inorganic & Nuclear
Debabrata Chatterjee, Olga Impert, Rudi van Eldik
Summary: The nitrogen cycle is a critical biogeochemical cycle involving redox conversions, such as nitrogen fixation and nitrification/denitrification pathways. This review focuses on the application of Ru(edta) complexes in electrochemical transformations related to the nitrogen cycle, providing mechanistic insights into their roles in nitrogen fixation and denitrification reactions.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Marta Chrzanowska, Anna Katafias, Rudi van Eldik, Jeanet Conradie
Summary: This study investigates the electronic effects on the mechanism of NAD(+) coenzyme reduction catalyzed by a non-organometallic ruthenium(ii) polypyridyl amine complex in the presence of formate. The results show that the reactions are slower due to the pi-back bonding effects of the ampy ligand. The formate-induced hydride transfer reaction is found to be the key step in the catalytic cycle.