Relevant bibliographies by topics / Fe4SMe

Academic literature on the topic 'Fe4SMe'

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Published: 10 March 2023
Last updated: 11 March 2023

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Journal articles on the topic "Fe4SMe"

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Cai, Lisheng, Brent M. Segal, Jeffrey R. Long, Michael J. Scott, and R. H. Holm. "Octanuclear Iron-Sulfur Clusters with Symmetrically Coupled Fe4S4 and Fe4S5 Cores." Journal of the American Chemical Society 117, no. 34 (August 1995): 8863–64. http://dx.doi.org/10.1021/ja00139a025.

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Schwarz, Michael, and Caroline Röhr. "Cs8[Fe4S10] and Cs7[Fe4S8], Two New Sulfido Ferrates with Different Tetrameric anions." Inorganic Chemistry 54, no. 3 (December 16, 2014): 1038–48. http://dx.doi.org/10.1021/ic502382v.

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Schwarz, Michael, and Caroline Roehr. "ChemInform Abstract: Cs8[Fe4S10] and Cs7[Fe4S8], Two New Sulfido Ferrates with Different Tetrameric Anions." ChemInform 46, no. 16 (April 2015): no. http://dx.doi.org/10.1002/chin.201516005.

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Belinskii, Moshe, Ivano Bertini, Oleg Galas, and Claudio Luchinat. "The Electronic Structure of the Fe4S3+4Cluster in Proteins: The Importance of Double Exchange Parameter." Zeitschrift für Naturforschung A 50, no. 1 (January 1, 1995): 75–80. http://dx.doi.org/10.1515/zna-1995-0110.

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The recently obtained Mössbauer and EPR parameters of the Fe4S43+ polymetallic center in the High Potential Iron-Sulfur Protein (HiPIP) II from E. halophila have been reproduced with models based on pure Heisenberg exchange. The role of double exchange versus ./-inequivalence is discussed. An evaluation of the upper limit of the double exchange parameter in the Fe4S43+ bimetallic center is also presented. The present calculations shed further light on the electronic structure of the Fe4S43+ center.
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Tyson, Marni A., Konstantinos D. Demadis, and Dimitri Coucouvanis. "Uncharged Mixed-Ligand Clusters with the [Fe4S4]+ and [Fe4S4]2+ Cores. Synthesis, Structural Characterization, and Properties of the Fe4S4X(tBu3P)3 (X = Cl, Br, I) and Fe4S4(SPh)2(tBu3P)2 Cubanes." Inorganic Chemistry 34, no. 18 (August 1995): 4519–20. http://dx.doi.org/10.1021/ic00122a002.

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Harmjanz, M., C. Junghans, U. A. Opitz, B. Bahlmann, and S. Pohl. "Neue Synthesewege zu neutralen gemischtsubstituierten Eisen-Schwefel-Clustern / Novel Synthetic Pathways to Neutral Mixed-Ligand Iron-Sulfur Clusters." Zeitschrift für Naturforschung B 51, no. 7 (July 1, 1996): 1040–48. http://dx.doi.org/10.1515/znb-1996-0722.

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The reaction of [Fe(NiSiMe3)2)2] with thiols RSH, elemental sulfur, and neutral ligands L (with sulfur donor atoms, e. g. thiourea derivatives) gives [Fe4S4(SR)2L2] clusters in high yields. The structure of [Fe4S4(2.4.6-(C3H7)3C6H2-S)2(dpdmi)2] (dpdmi: diisopropyldimethyl- imidazolthion) was determined by X-ray crystallography.When [Fe4S4I4]2- is reacted with a large excess of PMePh2 or PMe2Ph [F6S6I2(PMePh2)4] and [Fe6S6l2(PMe2Ph)4]. respectively, are obtained in nearly quantitative yield. Basket-like structures of the [Fe6S6]2+ cores were detected by X-ray structure analysis. While [Fe4S4(SR)4]2- clusters do not react with phosphanes at ambient temperature 2:2 functional­ized species like [Fe4S4(SR)2(tmtu)2] lead to basket-type clusters [Fe6S6(SR)2(PR3)4].
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Moriarty, Nigel W., and Paul D. Adams. "Iron–sulfur clusters have no right angles." Acta Crystallographica Section D Structural Biology 75, no. 1 (January 1, 2019): 16–20. http://dx.doi.org/10.1107/s205979831801519x.

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Accurate geometric restraints are vital in the automation of macromolecular crystallographic structure refinement. A set of restraints for the Fe4S4 cubane-type cluster was created using the Cambridge Structural Database (CSD) and high-resolution structures from the Protein Data Bank. Geometries from each source were compared and pairs of refinements were performed to validate these new restraints. In addition to the restraints internal to the cluster, the CSD was mined to generate bond and angle restraints to be applied to the most common linking motif for Fe4S4: coordination of the four Fe atoms to the side-chain sulfurs of four cysteine residues. Furthermore, computational tools were developed to assist researchers when refining Fe4S4-containing proteins.
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Liu, Jian She, Yan Fei Zhang, Mei Mei Geng, Jia Zeng, and Guan Zhou Qiu. "Research on isc Operon in Acidithiobacillus ferrooxidans ATCC 23270." Advanced Materials Research 20-21 (July 2007): 509–12. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.509.

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The highly conserved operon iron–sulfur cluster (iscSUA) is essential for the general biogenesis and transfer of iron–sulfur proteins in bacteria. In this study, expression, purification and characterization of the proteins of the isc operon (iscSUA) of Acidithiobacillus ferrooxidans ATCC 23270 was studied. Assembly and transfer of [Fe4S4] in vitro during the isc proteins and other iron sulfur proteins was studied in order to detect the pathway and mechanism of [Fe4S4] assembly and transfer in vivo. The [Fe4S4] cluster was successfully assembled in iron-sulfur proteins in vitro in the presence of Fe2+ and sulfide, and it was successfully transferred from IscA or IscU to iron- sulfur proteins. Our results support and extend certain models of iron-sulfur clusters assembly and transfer.
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Das, Diganta Kumar, Dhanada Sarmah, and Raben Ch Roy. "Significant effect of charge microenvironment on the redox potential of [Fe4Se4(SPh)4]2− in solution and inside film." Canadian Journal of Chemistry 92, no. 7 (July 2014): 625–28. http://dx.doi.org/10.1139/cjc-2013-0586.

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Through this work, we have shown that both the nature and the compactness of charge of the microenvironment around the [Fe4Se4(SPh)4]2−/3− couple are important in determining its redox potential. The redox potential of the [Fe4Se4(SPh)4]2−/3− couple has been measured in pure dimethylformamide (DMF), DMF added with surfactants of different charges, and also in positive surfactant film on an electrode surface. The redox potential becomes 0.090 V positive when the solution microenvironment is made positive compared to that in DMF. On the other hand, if the microenvironment is made positive and static (in the form of a positive film), the positive shift in the potential is 0.265 V, and compactness of charge induced an extra 0.175 V positive shift in the potential.
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Barber, M. J., V. Pollock, and J. T. Spence. "Microcoulometric analysis of trimethylamine dehydrogenase." Biochemical Journal 256, no. 2 (December 1, 1988): 657–59. http://dx.doi.org/10.1042/bj2560657.

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Trimethylamine dehydrogenase, which contains one covalently bound 6-S-cysteinyl-FMN and one Fe4S4 cluster per subunit of molecular mass 83,000 Da, was purified to homogeneity from the methylotrophic bacterium W3A1. Microcoulometry at pH 7 in 50 mM-Mops buffer containing 0.1 mM-EDTA and 0.1 M-KCl revealed that the native enzyme required the addition of 3 reducing equivalents per subunit for complete reduction. In contrast, under identical conditions the phenylhydrazine-inhibited enzyme required the addition of 0.9 reducing equivalent per subunit with a midpoint potential of +110 mV. Least-squares analysis of the microcoulometric data obtained for the native enzyme, assuming uptake of 1 electron by Fe4S4 and 2 electrons by FMN, indicated midpoint potentials of +44 mV and +36 mV for the FMN/FMN.- and FMN.-/FMNH2 couples respectively and +102 mV for reduction of the Fe4S4 cluster.
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Dissertations / Theses on the topic "Fe4SMe"

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KIM, NAMJIN. "Synthesis and Characterization of Amphiphilic Fe4S4-Core Dendrimers as Protein Models." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-07052006-133137/.

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The ultimate goal of this research is to clarify the structural effects on the rate and driving force for electron transfer in amphiphilic iron-sulfur core dendrimers, which can eventually be used as protein models. These dendrimers were synthesized by ligand exchange reactions, including the synthesis of dendrons via a modular synthesis approach. Their structure-property relationships were then investigated using electrochemical methods. Three different routes were used to synthesize thiol dendrons with both cationic and anionic peripheral units. The first utilized the disulfide linkage as a focal and protecting group. However, due to difficulties associated with generating free thiol from the disulfide, only partially-substituted dendrimers were prepared in ligand exchange reaction. Similar problems were encountered with the next two methods, which used thiocarbamate and trityl protecting groups, respectively. First generation dendrimers were successfully prepared and characterized using the thiocarbamate group; however, low thiol concentration resulted in only partially substituted dendrimers for the second generation. All synthetic attempts using the trityl focal group resulted in only partial substitution. Because the concentration of free thiol was the factor limiting the synthesis of these amphiphilic iron-sulfur core dendrimers, a protocol was established to measure the thiol concentration using Ellman?s reagent test. However, this proved to be inaccurate due to oxygen dissolved in solution and then re-oxidized thiols during the course of the test. The electrochemical properties of these cationic and anionic dendrimers were measured and compared to G1-flexible dendrimer previously studied by the Gorman Group. G1-cationic dendrimer exhibited more effective attenuation of the electron transfer rate than G1-flexible dendrimer. This was attributed to the difference of molecular weight in both dendrimers. The redox potential in the cationic dendrimer was shifted more positively by about 100 mV due to polar microenvironment around the iron-sulfur core. Cyclic voltammogram of G1-anionic dendrimer exhibited an unexpected peak so other electrochemical properties could not be measured. Only an approximate redox potential was obtained and exhibited a positive shift by about 60 mV compared to G1-flexible dendrimer.
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Schüren, Andreas Oskar [Verfasser]. "Neue Synthesestrategien zur Darstellung von [Fe4S4]-Clustern mit verschiedenen Halogenid-Ligandenkombinationen / Andreas Oskar Schüren." München : Verlag Dr. Hut, 2014. http://d-nb.info/1050331710/34.

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Lui, Siu Man. "Physical characterization and mechanistic studies of the [Fe4S4]-siroheme catalytic apparatus in sulfite and nitrite reductase enzymes /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487853913101079.

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Smith, Jennifer Connor. "Structure-property relationships for alternatively stiff and flexible redox-active dendrimers of the type, [Fe4S4(S-Dend)4]p̲2-." Raleigh, NC : North Carolina State University, 1999. http://www.lib.ncsu.edu/etd/public/etd-3419114109943070/etd.pdf.

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Smith, Jennifer Connor. "Structure-Property Relationships for Alternatively Stiff and Flexible Redox-Active Core Dendrimers of the Type, [Fe4S4(S-Dend)4]2-." NCSU, 1999. http://www.lib.ncsu.edu/theses/available/etd-19991119-052717.

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The purpose of this work has been to establish structure-property relationships in novel redox-active core dendrimers. Alternatively stiff and flexible series of redox-active, iron-sulfur core dendrimers of the general structure (nBu4N)2[Fe4S4(S-Dend)4] (Dend = dendrons of generations 1 through 4) were studied. Molecular dynamics simulations were performed on dendrimer models to produce detailed pictures of three-dimensional structure. These simulations along with NMR experiments (Pulsed Field-Gradient Spin-Echo and Inversion Recovery) indicated that the flexible dendrimers are much more compact than the rigid dendrimers. In addition, the simulations indicated an offset and mobile iron-sulfur core. In contrast, the rigid dendrimers were open with a more central and relatively immobile iron-sulfur core. Heterogeneous electron transfer rate constants measured using cyclic voltammetry and Osteryoung square wave voltammetry, indicated that the rigid dendrimers were more effective at attenuating the rate of electron transfer than were the flexible dendrimers of comparable molecular weight. These key structural differences for alternatively stiff and flexible dendrimers turned out to play a critical role in rationalizing their electron transport properties. That is, the offset positioning of the core in the flexible dendrimers permits facile electron transfer to/from a poised platinum electrode compared to the rigid dendrimers, where the core is centrally positioned. While the dendrimers containing rigid ligands had better encapsulated redox cores for a given molecular weight, these molecules had higher electron transfer rates for a given molecular radius. Moreover, for the rigid dendrimer series, the attenuation of electron transfer was modest as the molecular size increased, indicative of a highly ?conductive? medium. This behavior was not observed in the flexible series. Here, a steeper attenuation of the electron transfer rate constant was observed as molecular size increased, indicative of a comparably more insulating electron transfer medium.

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Bunkowske, Beatrice A. "Fluorescence Studies of Metal Organic Frameworks Based on the TATB Ligand, Synthesis and Characterization of an Fe4S4 Analogue and Organic Radicals." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1323152148.

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Mouesca, Jean-Marie. "Etude par ENDOR de deux centres paramagnétiques [Fe4S4]3+ : couplages hyperfins des protons & structure électronique et magnétique de ces deux cubanes." Grenoble 1, 1991. http://www.theses.fr/1991GRE10084.

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Les sites actifs des proteines fer-soufre sont le siege de reactions d'oxydoreduction. Le compose de formule |fe#4s#4 5sch#2c#6h#5)#4n et#4|#2 est un des analogues synthetiques de ces sites actifs. Dans des monocristaux de ce compose sont crees in situ les centres |fe#4s#4|#3#+, analogues des sites actifs des ferredoxines a haut potentiel dans leur etat oxyde, centres que l'on etudie alors par double resonance endor. La mesure pour deux de ces centres des tenseurs d'interaction hyperfine avec les huit protons des groupements ch#2 des ligands benzylthiolates a permis la determination de la distribution de la densite de spin au sein de ces agregats. Les densites observees pour les deux centres sont fortement differentes et s'interpretent, soit en termes de couplages de spin, pour lesquels ils correspondent a deux modes de couplages distincts, soit en termes de delocalisation plus ou moins prononcee de la population de spin entre les fer. En outre, nous parvenons a relier les couplages hyperfins isotropes des protons aux densites de spin portees par les fer et a la geometrie des ligands
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Sorrentino, Andrea Luigi. "The role of the substrate on the magnetic behaviour of sublimated magnetic molecules." Doctoral thesis, 2022. http://hdl.handle.net/2158/1277319.

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PhD thesis is focused on the deposition and investigation of different magnetic molecules on substrates of technological interest. The aim was to understand the role of the substrates in preserving and controlling the molecular magnetic properties. The study has been focused on the deposition of TbPc2 and Fe4SMe molecules on titanium dioxide (TiO2) and Pb superconducting materials. For all the investigated systems a multi-technical characterization (XPS, STM, XAS, and others) in an Ultra-High Vacuum environment has been performed. Besides, Scanning Tunneling Spectroscopy (STS) has been used to investigate the local magnetic properties of the candidate molecular qubit [CpTi(cot)] deposited on superconducting Pb islands.
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CHIU, MIN-HSIANG, and 邱民翔. "On Outage Analysis and Optimization for Full-Duplex Relay Networks with Energy Harvesting." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fe4sa5.

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碩士
國立中央大學
通訊工程學系
107
This paper discusses the outage performance of full-duplex relay channel using amplify-and-forward(AF) relay protocol with energy harvesting(EH) and compare with its optimum one. Previous works almost focused on that destination treated the self-interference signal as interference only, so in that works they wanted to eliminate self-interference(SI) signal. We provide a system model with make self-interference signal assist information decoding at the destination. At the relay node, the received signals, including self-interference, are split according to a power ratio for information processing (IP) and energy harvesting, respectively. We derive an approximate, yet accurate, closed-form expression for the end-to-end outage probability and optimum one. In addition, the processing delay is larger than one in practice, the proposed close-form outage probability expression is still valid. Finally, we corroborate our theoretical results with simulations in different situations. The results indicate that the proposed system model with optimization can outperforms system with fixed power splitting method.
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谷藤, 一樹, and Kazuki Tanifuji. "Synthesis and Reactivities of Highly Oxidized [Fe4S4] Clusters." Thesis, 2014. http://hdl.handle.net/2237/20003.

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Book chapters on the topic "Fe4SMe"

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk, et al. "Fe4Sn7[SiO4]2O8." In Landolt-Börnstein - Group III Condensed Matter, 416. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_336.

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Noodleman, L., J. L. Chen, D. A. Case, C. Giori, G. Rius, J. M. Mouesca, and B. Lamotte. "Isotropic Proton Hyperfine Coupling in High Potential [Fe4S4]3+ Models." In Nuclear Magnetic Resonance of Paramagnetic Macromolecules, 339–67. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8573-6_16.

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"2. Fe3S /Fe4S4 Interconversion." In Handbook on Metalloproteins, 463–70. CRC Press, 2001. http://dx.doi.org/10.1201/9781482270822-43.

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