Article
Chemistry, Physical
Isaac Daniel, Bohyeon Kim, Mark Douthwaite, Samuel Pattisson, Richard Lewis, Joseph Cline, David Morgan, Donald Bethell, Christopher Kiely, Steven Mcintosh, Graham Hutchings
Summary: The cooperative redox enhancement effects in Au-Pd systems play a crucial role in promoting bimetallic catalysis in thermochemical oxidation. The electrochemical polarization of two disparate catalytic sites leads to an observed activity enhancement in thermochemical systems, increasing the driving force of each of the composite half reactions in oxidative dehydrogenation.
Article
Plant Sciences
Ruben M. Buey, David Fernandez-Justel, Gloria Gonzalez-Holgado, Marta Martinez-Julvez, Adrian Gonzalez-Lopez, Adrian Velazquez-Campoy, Milagros Medina, Bob B. Buchanan, Monica Balsera
Summary: The text describes the role of thioredoxin reductases in regulating enzyme activity, as well as the presence of a new type of thioredoxin reductase in some cyanobacteria that lack NTR and FTR. Research shows that this thioredoxin reductase can substitute for FTR in regulating enzyme activity in photosynthesis.
Article
Chemistry, Physical
Lukas Vlcek, Shize Yang, Yongji Gong, Pulickel Ajayan, Wu Zhou, Matthew F. Chisholm, Maxim Ziatdinov, Rama K. Vasudevan, Sergei V. Kalinin
Summary: By using atomically resolved scanning transmission electron microscopy images to visualize complex structural correlations within materials and translating them into statistical mechanical models, improved predictions of material properties can be achieved. Additionally, combining model optimization techniques with the principles of statistical hypothesis testing can effectively handle uncertainties in the study of materials with strong correlations.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Giulia Di Rocco, Gianantonio Battistuzzi, Antonio Ranieri, Carlo Augusto Bortolotti, Marco Borsari, Marco Sola
Summary: The thermodynamic and kinetic properties of heterogeneous electron transfer were measured for immobilized small laccase from Streptomyces coelicolor using cyclic voltammetry. The results showed that the E degrees' value of immobilized SLAC is particularly sensitive to the anchoring mode and medium conditions.
Article
Biochemistry & Molecular Biology
Taiki Adachi, Keisei Sowa, Yuki Kitazumi, Osamu Shirai, Kenji Kano
Summary: The study showed that cyanide enhanced the bioelectrocatalytic activity of membrane-bound alcohol dehydrogenase (ADH) from Gluconobacter oxydans, while not affecting its catalytic activity in solution. Electrochemical methods and electron spin resonance spectroscopy revealed the detailed electron transfer pathway in the DET-type bioelectrocatalysis by ADH.
BIOELECTROCHEMISTRY
(2022)
Article
Optics
Takuya Hatomura
Summary: This study proposes a method to calculate the errors in digital quantum simulation and extends it to noisy quantum computers.
Article
Biochemistry & Molecular Biology
Michael Lienemann
Summary: Recent advancements in enzymatic electrosynthesis using renewable energy sources and specific catalysts have generated interest. However, the development of these processes is hindered by a lack of understanding of the molecular mechanisms involved. Studying non-electrosynthetic electron transferring proteins can provide insight into how redox proteins control and transfer electrons efficiently. This understanding can lay the foundation for further studies on the structural biology of enzymatic electrosynthesis.
COMPUTATIONAL AND STRUCTURAL BIOTECHNOLOGY JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Han-Wen Zheng, Dong-Dong Yang, Yong-Sheng Shi, Tong Xiao, Hong-Wei Tan, Xiang-Jun Zheng
Summary: In this work, three salicylaldehyde hydrazone Zn(II) complexes were synthesized and their responsive behaviors to external stimuli were investigated. The complexes exhibited reversible photochromic and photoluminescence properties in solution, mechanochromic luminescence property in the solid state, and delayed fluorescence properties due to halogen bond interactions. The study provides new insights into the design of multi-stimuli-responsive materials.
INORGANIC CHEMISTRY
(2023)
Article
Biotechnology & Applied Microbiology
Dummi Mahadevan Gurumurthy, Muhammad Bilal, Ashok Kumar Nadda, Vaddi Damodara Reddy, Ganesh Dattatraya Saratale, Urszula Guzik, Luiz Fernando Romanholo Ferreira, Sanjay Kumar Gupta, Mohammed Azharuddin Savanur, Sikandar I. Mulla
Summary: This study identified a cell wall-associated extracellular electron transfer (EET) in the thermophilic Geobacillus sp. for utilizing iron as a terminal electron acceptor. The transfer of electrons was primarily linked to cell wall cytochrome-c and diffusible redox mediators during anoxic conditions. The study suggests that the absence of surface polysaccharide and diffusible mediators favors the cell wall-associated EET pathway in Geobacillus sp.
Article
Chemistry, Physical
Bo Hu, Hongbin Li, Hao Fan, Jiangxuan Song
Summary: We report a high-volumetric-capacity and long-lifetime aqueous organic redox flow battery (AORFB) anolyte based on a six-electron transfer pi-conjugated heteroaromatic hexaazatrinaphthalene tricarboxylic acid (HATNTA). HATNTA undergoes a reversible three-step six-electron redox process at pH=14. The HATNTA-based AORFB exhibits high open-circuit voltage, impressive specific capacity, high output power density, and superior cycling stability.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jory Lietard, Dominik Ameur, Mark M. Somoza
Summary: Fluorescein's fluorescence intensity is strongly influenced by its chemical environment, particularly in nucleic acids. This study comprehensively investigates how DNA sequences affect fluorescence intensity and identifies complex changes in fluorescence intensity depending on sequence contexts involving proximity to nucleobases.
Article
Biochemistry & Molecular Biology
Kanwal Kayastha, Stella Vitt, Wolfgang Buckel, Ulrich Ermler
Summary: The discovery of flavin-based electron bifurcation (FBEB) in 2008 opened up a new field of application for flavins in biology, utilizing bifurcating flavins with strongly inverted reduction potentials to drive endergonic with exergonic reduction reactions. This mechanism plays a crucial role in the energy metabolism efficiency of obligate anaerobic microorganisms by utilizing low-potential electron acceptors to power endergonic processes.
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
(2021)
Article
Plant Sciences
Karen Zinzius, Giulia Maria Marchetti, Ronja Fischer, Yuval Milrad, Anne Oltmanns, Simon Kelterborn, Iftach Yacoby, Peter Hegemann, Martin Scholz, Michael Hippler
Summary: By performing quantitative proteomic analysis of wild-type and mutant cells, it was revealed that CRX plays a role in regulating the redox balance of NTRC and PRX1 in the chloroplast, and is interconnected with photosynthesis and Ca2+ signaling.
Article
Engineering, Environmental
Yair A. Del Angel, Refugio B. Garcia-Reyes, Lourdes B. Celis, Denisse Serrano-Palacios, Pablo Gortares, Luis H. Alvarez
Summary: Anthraquinone-2,6-disulfonate (AQDS) was utilized as an electron acceptor to enrich a community of quinone-reducing microorganisms for improved biotransformation of congo red. The enriched sludge exhibited significantly higher decolorization rates compared to the control group, with a shift in microbial composition observed in the enriched sludge.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Lei Yu, Cheng-jia Ju, Kai-yan Jing, Zi-yang Wang, Shareen Niyazi, Quan Wang
Summary: To enhance the denitrification efficiency, exogenous redox mediators (RMs) are commonly used to improve electron transfer. Previous studies have focused on improving extracellular electron transfer (EET) through the use of RMs, but the intracellular electron transfer (IET) of biological denitrification has been rarely reported. This study identified the core components in the IET chain of denitrification and investigated the role of a specific redox mediator in enhancing IET. The results provide a better understanding of the electron transfer pathways of denitrification and suggest a potential practical application for exogenous RMs in nitrate-containing wastewater treatment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Analytical
Ibrahim Halil Oener, Christin David, Christine Joy Querebillo, Inez M. Weidinger, Khoa Hoang Ly
Summary: This study presents a facile approach to determine the electromagnetic field enhancement and optical activity of nanostructured TiN electrodes, using the combination of TiN electrodes and surface-enhanced Raman scattering (SERS) spectroscopy. The results provide valuable insights into the properties and applications of TiN electrodes.
Article
Physics, Multidisciplinary
Marten Richter, Stephen Hughes
Summary: The study extended the algorithm for quantum path integrals using tensor networks to open quantum systems with off-diagonal coupling. Demonstrating this approach on a coupled cavity waveguide system also hints at potential applications in other areas.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Emil Denning, Andreas Knorr, Florian Katsch, Marten Richter
Summary: Electromagnetic quantum fluctuations can be modulated into quadrature squeezing, a key quantum resource generated from nonlinear optical processes. By interfacing atomically thin semiconductors with an optical cavity, it is possible to utilize two-photon resonance and biexcitonic parametric gain for generating squeezed light with significantly lower input power compared to devices using conventional third-order nonlinear materials. Moreover, the squeezing bandwidth is found to be several meV, highlighting atomically thin semiconductors as a promising candidate for on-chip squeezed-light sources.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Sattwick Haldar, Preeti Bhauriyal, Anthony R. Ramuglia, Arafat H. Khan, Sunel De Kock, Arpan Hazra, Volodymyr Bon, Dominik L. Pastoetter, Sebastian Kirchhoff, Leonid Shupletsov, Ankita De, Mark A. Isaacs, Xinliang Feng, Michael Walter, Eike Brunner, Inez M. Weidinger, Thomas Heine, Andreas Schneemann, Stefan Kaskel
Summary: The chelating ability of quinoxaline cores and the redox activity of organosulfide bridges in covalent organic frameworks (COFs) provide dual active sites for reversible lithium storage. Combining these properties, the designed COFs exhibit a stable Li-OrS battery mechanism, mitigating the issues of Li-polysulfide dissolution in Li-S batteries.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Tobias Pietsch, Jan Blasius, Janine Richter, Matthias A. Grasser, Oldamur Holloczki, Philipp Wollmann, Inez M. Weidinger, Michael Ruck, Eike Brunner
Summary: The dissolution of gray selenium in tetraalkylphosphonium acetate ionic liquids was studied using various spectroscopic and analytical techniques. The presence of acetate anions and tetraalkylphosphonium cations facilitated the formation and stabilization of oligoselenides and cationic Se species in the ionic liquid phase. Chemical exchange of selenium atoms was observed, and uncharged cycloselenium molecules were identified at high selenium concentrations. Upon dilution with ethanol, amorphous red selenium precipitated from the solution, while the addition of elemental tellurium resulted in the precipitation of crystalline Se1-xTex solid solutions.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Vladimir Pelmenschikov, Delfim Ferreira, Sofia S. Venceslau, Peter Hildebrandt, Ines A. . C. Pereira, Smilja Todorovic, Smilja Todorovic
Summary: In this study, resonance Raman spectroscopy and density functional theory calculations were used to investigate the structural, electronic, and vibrational properties of the noncubane [4Fe-4S] cluster in heterodisulfide reductase (HdrB). Homology modeling was employed to predict the protein environment of the neighboring clusters in DvHdrB. The results showed that the oxidized [4Fe-4S](3+) cluster adopts a closed conformation in the absence of substrate, but transitions to an open structure upon substrate coordination, accompanied by a ligand switch. This study provides valuable insights for future research on enzymes with this unconventional cofactor.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Lucinda E. Mulko, Emma A. Cuello, Robert Baumann, Anthony R. Ramuglia, Inez M. Weidinger, Diego F. Acevedo, Cesar A. Barbero, Maria Molina, Andres Fabian Lasagni
Summary: In this study, a polyacrylamide graphene oxide hydrogel composite (GO@pAAm) was photo-converted and structured by ultra-short laser irradiation using a direct laser writing (DLW) approach. The laser structure generated surface foaming and patterning, enhanced selective water-swelling microdomains, and effective photo-reduction of graphene oxide. The reduction of graphene oxide was evidenced by changes in the Raman spectroscopy signals. Macroscopically, the conductivity of the material increased, suggesting a reduction in sheet resistance.
Article
Chemistry, Physical
Victoria Davis, Nina Heidary, Amandine Guiet, Khoa Hoang Ly, Maximilian Zerball, Claudia Schulz, Norbert Michael, Regine von Klitzing, Peter Hildebrandt, Stefan Frielingsdorf, Oliver Lenz, Ingo Zebger, Anna Fischer
Summary: The oxygen tolerance of membrane-bound [NiFe] hydrogenase (MBH) from Cupriavidus necator makes it an attractive electrocatalyst for hydrogen energy conversion devices. By immobilizing MBH with affinity tags on a tin-rich indium tin oxide (ITOTR) electrode, hydrogen oxidation and an unusually high proton reduction current were observed, suggesting bidirectionality in unidirectional [NiFe] hydrogenases. The favorable enzyme-semiconductor interactions contribute to this behavior.
Review
Biochemistry & Molecular Biology
Peter Hildebrandt
Summary: This review summarizes how resonance Raman and IR spectroscopy contributed to the understanding of the structure, dynamics, and reaction mechanism of phytochromes. It also discusses the challenges faced in experimental and theoretical research and describes strategies to overcome them.
Article
Materials Science, Multidisciplinary
Robert Fuchs, Marten Richter
Summary: Over the past two decades, the hierarchical equations of motion (HEOM) developed by Tanimura and Kubo have become a widely-used tool for numerically exact calculations of system-bath problems. HEOM has been generalized to account for various dissipation and transfer processes involving an external bath. This study generalizes the concept behind HEOM to include photon retardation in spatially extended photonic systems, and applies it to the example of two dielectric slabs. The derived equations offer a straightforward and reliable framework for describing retardation, potentially offering an alternative to path-integral treatments.
Article
Chemistry, Multidisciplinary
Tarali Devi, Kuheli Dutta, Jennifer Deutscher, Stefan Mebs, Uwe Kuhlmann, Michael Haumann, Beatrice Cula, Holger Dau, Peter Hildebrandt, Kallol Ray
Summary: This study emphasizes the importance of subtle electronic changes and secondary interactions in the stability of biologically relevant metal-dioxygen intermediates. It also shows that the role of the chloride ligand in stabilizing the Fe-III-(OOBu)-Bu-t moiety can extend to other anions, including the thiolate ligand.
Article
Materials Science, Multidisciplinary
Emil V. Denning, Andreas Knorr, Florian Katsch, Marten Richter
Summary: This paper theoretically investigates spontaneous four-wave mixing and quadrature-squeezing in a bichromatically pumped atomically thin semiconductor microcavity, exploring different configurations that lead to the generation of strongly single- and two-mode quadrature-squeezed light.
Article
Chemistry, Physical
Aleksandr Bashkatov, Syed Sahil Hossain, Gerd Mutschke, Xuegeng Yang, Hannes Rox, Inez M. Weidinger, Kerstin Eckert
Summary: This study investigates the growth of single hydrogen bubbles at micro-electrodes in an acidic electrolyte. New bubble growth regimes are identified and key features such as bubble radius growth law, dynamics of microbubble carpet, onset time of oscillations, and oscillation frequencies are characterized. The system's response to jumps in cathodic potential is also studied, leading to a hypothesis on the mechanisms underlying the microbubble carpet and oscillations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Sang Wook Park, Zhe Zhang, Haoyuan Qi, Baokun Liang, Javeed Mahmood, Hyuk-Jun Noh, Mike Hambsch, Mingchao Wang, Mao Wang, Khoa Hoang Ly, Zhiyong Wang, Inez M. Weidinger, Shengqiang Zhou, Jong-Beom Baek, Ute Kaiser, Stefan C. B. Mannsfeld, Xinliang Feng, Renhao Dong
Summary: A new method for the controlled synthesis of two-dimensional conjugated metal-organic framework (2D c-MOF) films with high crystallinity and defined layer orientation has been developed. The achieved films exhibit in-plane orientation, polycrystalline structure, and show superior performance, such as fast response humidity sensing.
ACS MATERIALS LETTERS
(2022)
Article
Chemistry, Physical
Maria Fernandez Lopez, Margarethe Dahl, Francisco Velazquez Escobar, Hernan Ruy Bonomi, Anastasia Kraskov, Norbert Michael, Maria Andrea Mroginski, Patrick Scheerer, Peter Hildebrandt
Summary: This study investigates the structure and mechanistic properties of different types of phytochromes in bacteria using resonance Raman and IR difference spectroscopy, and reveals subtle differences in the photoinduced conversions and proton transfer processes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)