Relevant bibliographies by topics / Reaction centre

Academic literature on the topic 'Reaction centre'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Reaction centre"

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Magni, Sergio, and Guido Sello. "Reaction centre accessibility. II. Role of reaction centre congestion in the calculation of reaction centre accessibility." Computers & Chemistry 24, no. 6 (September 2000): 645–57. http://dx.doi.org/10.1016/s0097-8485(00)00069-3.

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Coleman, William J., and Douglas C. Youvan. "Atavistic reaction centre." Nature 366, no. 6455 (December 1993): 517–18. http://dx.doi.org/10.1038/366517a0.

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Evans, Michael C. W., Matthew C. Berry, Peter J. Bratt, Olga Kaminskaya, and Jonathan H. A. Nugent. "Metal—Redox Centre interactions in photosynthetic reaction centres." Biochemical Society Transactions 22, no. 3 (August 1, 1994): 718–20. http://dx.doi.org/10.1042/bst0220718.

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Evans, M. C. W. "Plant reaction centre defined." Nature 327, no. 6120 (May 1987): 284–85. http://dx.doi.org/10.1038/327284a0.

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Barber, Jim. "Signals from the reaction centre." Nature 332, no. 6160 (March 1988): 111–12. http://dx.doi.org/10.1038/332111a0.

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Knaff, D. B. "The photosystem I reaction centre." Trends in Biochemical Sciences 13, no. 12 (December 1988): 460–61. http://dx.doi.org/10.1016/0968-0004(88)90228-9.

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Magni, Sergio, and Guido Sello. "Reaction centre accessibility. I. Calculation of reaction centre congestion and influence of structure flexibility." Computers & Chemistry 24, no. 6 (September 2000): 635–44. http://dx.doi.org/10.1016/s0097-8485(00)00068-1.

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Heathcote, Peter, Michael R. Jones, and Paul K. Fyfe. "Type I photosynthetic reaction centres: structure and function." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 358, no. 1429 (January 29, 2003): 231–43. http://dx.doi.org/10.1098/rstb.2002.1178.

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We review recent advances in the study of the photosystem I reaction centre, following the determination of a spectacular 2.5 Å resolution crystal structure for this complex of Synechococcus elongatus . Photosystem I is proving different to type II reaction centres in structure and organization, and the mechanism of transmembrane electron transfer, and is providing insights into the control of function in reaction centres that operate at very low redox potentials. The photosystem I complex of oxygenic organisms has a counterpart in non–oxygenic bacteria, the strictly anaerobic phototrophic green sulphur bacteria and heliobacteria. The most distinctive feature of these type I reaction centres is that they contain two copies of a large core polypeptide (i.e. a homodimer), rather than a heterodimeric arrangement of two related, but different, polypeptides as in the photosystem I complex. To compare the structural organization of the two forms of type I reaction centre, we have modelled the structure of the central region of the reaction centre from green sulphur bacteria, using sequence alignments and the structural coordinates of the S. elongatus Photosystem I complex. The outcome of these modelling studies is described, concentrating on regions of the type I reaction centre where important structure–function relationships have been demonstrated or inferred.
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Böhm, Stanislav, and Otto Exner. "Revision of the Dual-Substituent-Parameter Treatment; Reaction Series with a Donor Reaction Centre." Collection of Czechoslovak Chemical Communications 72, no. 8 (2007): 1158–76. http://dx.doi.org/10.1135/cccc20071158.

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The dual-substituent-parameter (DSP) treatment was challenged previously as not generally valid. Just in the fundamental reaction, dissociation of 4-substituted benzoic acids and in similar reactions, DPS does not hold for acceptor substituents because the constant reaction centre is itself an acceptor. In this communication, the reverse case was examined, i.e., a reaction series with a donor reaction centre: basicity and acidity of 4-substituted anilines, and acidity of 4-substituted phenols. The reaction energies were calculated for 19 common substituents at the level B3LYP/6-311+G(d,p)//B3LYP/6-311+G(d,p); the substituents effects were also estimated separately in uncharged molecules and in the ions in terms of isodesmic reaction. DSP is valid and its resonance term is highly significant for molecules with acceptor substituents; donor substituents behave differently and cannot be described by simple resonance constants. Basicity of substituted anilines is more complex since the substituent effects are quite different in the free base and in the protonated form: basicity is controlled by a combination of various effects. It is recommended to use DSP only for acceptor substituents with a donor reaction centre or vice versa; otherwise the accuracy is decreased. All results were obtained with isolated molecules and with resonance constants derived on isolated molecules; however, they retain their validity even with the common constants σR determined from the reactions in solution.
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Barber, Jim. "Protein crystallography: A reaction centre elucidated." Nature 315, no. 6017 (May 1985): 278–79. http://dx.doi.org/10.1038/315278a0.

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Dissertations / Theses on the topic "Reaction centre"

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Watson, Ashley James. "Stability and interactions of the purple bacterial reaction centre." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424644.

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Ashby, M. K. "Reaction centre and light harvesting genes of Rhodobacter sphaeroides." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/46944.

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He, Weizhong. "Spectroscopic properties of the isolated photosystem II reaction centre." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46812.

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Wakeham, Marion Charlotte. "Inactive branch electron transfer in the purple bacterial reaction centre." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400271.

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Rolfe, Stephen Alexander. "Electron transport in cyanobacterial photosystem II." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258430.

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Alizadeh, Sedigheh. "Characterisation of the photosystem two reaction centre complex from Chlamydomonas reinhardtii." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294966.

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Bohles, Felix. "Protein-cofactor interactions in the photosynthetic reaction centre of Rhodobacter sphaeroides." Thesis, Queen Mary, University of London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509673.

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Newell, William Robert. "Organisation of the photosystem two reaction centre as revealed by spectroscopy." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47587.

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Ashraf, Khuram Umar. "Studies of the green sulphur bacterial reaction centre from Chlorobaculum tepidum." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/6379/.

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Photosynthetic organisms harvest sunlight through antenna light-harvesting complexes. Light absorbed by chromophores is transferred down an energy gradient to a reaction centre (RC) where photoinduced electron transfer occurs. A charge-separated state is generated that preserves some of the original light energy as electrochemical potential. By studying these RCs allows for us to deduce how they function through the elucidation of their structure, which ultimately allows for artificial mimics to be made. Chlorobaculum tepidum (C. tepidum) is a green sulphur photosynthetic bacterium that contains a type I RC. Light energy is transferred to the RC from chlorosomes via a soluble Fenna-Mathews-Olson (FMO) protein. Although the structure of FMO has been solved on its own, little is known about the molecular organization of the reaction centre complex. This thesis looks at two of the RC sub-units (PscB and PscD) that are water-soluble. To understand the contribution that these proteins make to RC function, they have been made in E. coli using an in-house expression vector. Using a 3C protease - iLOV - biotin acceptor domain - His10 (CLBH) tag, both PscB and PscD can be readily purified on a milligram-scale in four simple steps (Ni2+-affinity, subtractive IMAC (immobilized metal affinity chromatography) after cleavage with 3C protease, gel-filtration). PscD and PscB have been labelled with 15N and 13C for structural analysis by NMR, so far PscD has shown to partially disordered implying that a potential binding partner may be required. PscB has shown to be well structured and is in the process of having its structure elucidated. The binding PscD with FMO and ferredoxin from Arabadopsis thaliana has also been assessed by isothermal calorimetry to help identify the function of this protein. Here it is also observed that when the RC is coupled to plasmons a near 5 fold increase is observed in fluorescence enhancement as compared to RC by itself. Plasmonic metallic nanoparticles are able to drastically alter the emission of vicinal fluorophores. Metallic nanoparticles can influence the fluorescence emission of nearby molecules by enhancing the absorbance of the molecule, and by modifying the radiative decay rate of that molecule. And this is what is observed. This can further be increased when coupling the RC to the Plasmon by placing a silicon dioxide (SiO2) spacer in-between the RC and nanoparticle. This is the highest flouresence enhancement observed to date. As yet, no green sulphur bacterial RC has had its structure determined. Here, purification protocols have been developed that allow milligram quantities of a complex between the RC and FMO to be prepared. As well as identifying the best suitable detergents for solubilising and purifying the RC, two different populations of the RC have been discovered that can be separated by sucrose density gradients. Vapor diffusion, lipidic-cubic phase (LCP), bicelle, and co-crystallisation trials have been performed with pure RC-FMO. Thus far, promising crystals have been obtained when the RC has been co-crystallised with ferredoxin to 60 Å. These promising crystals are the first of its type, as this is the first type 1 RC crystal obtained.
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Wallin, Elizabeth. "The germinal centre reaction and follicular T cells in alloantibody formation." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:e4ecdd13-7c1e-4d4e-8491-8a22857cdb86.

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Kidney transplantation is the optimal treatment for end-stage renal failure, however graft lifespan remains limited, and a major cause of graft loss is chronic, low-grade antibody-mediated damage. Understanding more about how these antibodies are produced, and how immunosuppression affects cells producing them, may allow both prediction of those at risk, and a mechanism for preventing or minimising antibody production, therefore improving graft lifespan. In particular, interest has grown in CD4 T cells known as circulating T follicular helper (cTfh) and T follicular regulatory (cTfr) cells, which appear to correlate with antibody production in vaccination, autoimmunity and potentially transplantation, however little is known about how immunosuppression alters these cells and their function. This study aimed to establish whether cTfh and cTfr cells could be used to predict the risk of de novo donor-specific antibody (DSA) formation in 61 kidney and simultaneous pancreas kidney (SPK) transplant recipients. Results suggested that high cTfh cells and low cTfr associated with de novo DSA formation, and the ratio of the two cells may be useful for identifying at-risk patients. Different immunosuppression regimens were associated with different levels of risk for de novo DSA formation, with basiliximab induction combined with azathioprine maintenance therapy having the lowest risk, despite being considered a less intensive regimen. In vitro experiments suggest this may be due to a differential effect of azathioprine on cTfh and B cells compared to mycophenolate mofetil, an alternative maintenance agent. Combining the in vitro and clinical data suggests that azathioprine may reduce the risk of de novo DSA formation after transplantation compared to other agents because of its effects on B cells, cTfh and cTfr. This is an exciting development that warrants further investigation.
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Books on the topic "Reaction centre"

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Knaff, D. B. The photosystem I reaction centre. Amsterdam: Elsevier, 1988.

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Nieuwenhuis, Saskia Apollonia Maria. Investigation of the oxygenic photosynthetic reaction centre photosystem II with specific isotope labelling: Synthesis and incorporation of stable-isotope labelled (S)-phenylalanine and (S)-tyrosine. [Leiden: S.A.M. Nieuwenhuis, 1998.

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Breton, Jacques, and André Verméglio, eds. The Photosynthetic Bacterial Reaction Center. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0815-5.

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Michel-Beyerle, Maria-Elisabeth, ed. The Reaction Center of Photosynthetic Bacteria. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-61157-5.

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Breton, Jacques, and André Verméglio, eds. The Photosynthetic Bacterial Reaction Center II. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3050-3.

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1942-, Breton Jacques, Vermeglio André, and North Atlantic Treaty Organization. Scientific Affairs Division., eds. The photosynthetic bacterial reaction center: Structure and dynamics. New York: Plenum Press, 1988.

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Nitschke, Wolfgang. Photosynthetic reaction centres: Variations on a common structural theme. Amsterdam: Elsevier, 1991.

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Schulten, Elisabeth Agnes Michèle. Electronic structure of the special pair in photosynthetic reaction centres: Site-directed 13C labelled chlorophylls investigated with MAS NMR spectroscopy. [Leiden: Universiteit Leiden, 2003.

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H, Lemmer Richard, ed. Multistep direct reactions: 30 September-2 October 1991, National Accelerator Centre, Faure, South Africa. Singapore: World Scientific, 1992.

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Winter College on Fundamental Nuclear Physics (1984 International Centre for Theoretical Physics). Proceedings of the Winter College on Fundamental Nuclear Physics: International Centre for Theoretical Physics, Trieste, Italy, 7 Feb.-30 Mar. 1984. Edited by Dietrich K, Di Toro M, Mang H. J, and International Centre for Theoretical Physics. Singapore: World Scientific, 1985.

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Book chapters on the topic "Reaction centre"

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Faro, Jose, and Michal Or-Guil. "Reassessing Germinal Centre Reaction Concepts." In Mathematical Models and Immune Cell Biology, 241–58. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-7725-0_12.

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Gregory, R. P. F. "Electron Transfer within Reaction-Centre Complexes." In Photosynthesis, 61–82. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0391-3_4.

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Telfer, Alison, Jonathan B. Marder, and James Barber. "Phosphorylation of Photosystem Two Reaction Centre Polypeptides." In Photosynthesis, 175–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74221-7_13.

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Permentier, H. P., K. A. Schmidt, C. Francke, S. Neerken, C. Hager-Braun, and J. Amesz. "Reaction Centre Complexes of Green Sulfur Bacteria." In Photosynthesis: Mechanisms and Effects, 527–30. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-3953-3_123.

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Barber, J., D. J. Chapman, K. Gounaris, and A. Telfer. "Further Characterisation of the Isolated PS2 Reaction Centre." In Photosynthesis, 85–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74221-7_7.

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Demetriou, Christalla, Christopher J. Lockett, Simon J. Bowden, and Jonathan H. A. Nugent. "ESR Characterisation of the Photosystem 2 Reaction Centre." In Current Research in Photosynthesis, 411–14. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_91.

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Hager-Braun, Christine, Astrid Riedel, Dian-Lin Xie, Rainer Zimmermann, Nathan Nelson, and Günter Hauska. "Characterization of the Photosynthetic Reaction Centre from Chlorobia." In Photosynthesis: from Light to Biosphere, 1149–52. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_272.

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Demetriou, Christalla, Christopher J. Lockett, and Jonathan H. A. Nugent. "Photochemistry in the Isolated Photosystem 2 Reaction Centre." In Techniques and New Developments in Photosynthesis Research, 233–36. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-8571-4_26.

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van Brederode, M. E., L. M. P. Beekman, D. Kuciauskas, M. R. Jones, I. H. M. van Stokkum, and R. van Grondelle. "Characteristics of the electron transfer reactions in the M210W reaction centre only mutant ofRhodobacter sphaeroides." In The Reaction Center of Photosynthetic Bacteria, 225–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-61157-5_18.

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Molenaar, Douwe, Wim Crielaard, Wil N. Konings, and Klaas J. Hellingwerf. "Functional Reconstitution of Photosynthetic Reaction Centre Complexes from Rhodopseudomonas Palustris." In Receptors, Membrane Transport and Signal Transduction, 352–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74200-2_30.

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Conference papers on the topic "Reaction centre"

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Curtis, N. "Search For Three Centre Cluster Structures in 10,11,12B." In FUSION06: Reaction Mechanisms and Nuclear Structure at the Coulomb Barrier. AIP, 2006. http://dx.doi.org/10.1063/1.2338371.

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Schwerer, O. "Nuclear Reaction Data Centre Network: A Success Story." In INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY. AIP, 2005. http://dx.doi.org/10.1063/1.1944962.

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Rinaldi, G., G. Housley, A. Shah, B. Dennis, and M. Loebinger. "S47 Hypertonic saline inhaled therapy – results of drug reaction assessments." In British Thoracic Society Winter Meeting 2017, QEII Centre Broad Sanctuary Westminster London SW1P 3EE, 6 to 8 December 2017, Programme and Abstracts. BMJ Publishing Group Ltd and British Thoracic Society, 2017. http://dx.doi.org/10.1136/thoraxjnl-2017-210983.53.

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R., Senthil J., Santa A., Pavan KB, Rakesh P., Pravanika G., Pravanika G., Narander Ch, and Krishna MMVT. "An Analysis of Acute Adverse Drug Reactions Occurring in Day Care Chemotherapy Setting in a Tertiary Care Cancer Centre." In Annual Conference of Indian Society of Medical and Paediatric Oncology (ISMPO). Thieme Medical and Scientific Publishers Pvt. Ltd., 2021. http://dx.doi.org/10.1055/s-0041-1735376.

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Abstract Introduction Acute adverse drug reactions (ADRs) in day care chemotherapy are not uncommon and easily manageable many a time. However, sometimes they may lead to untoward events. It is of paramount importance to document and analyze such events in contemporary medical oncology practice for the best utilization and planning of available personnel and resources. Objectives This study was aimed to analyze the acute ADRs occurring in day care cancer chemotherapy setting. Materials and Methods All acute ADRs reported in day care cancer chemotherapy setting, during the administration of chemotherapy, at Basavatarakam Indo American Cancer Hospital, Hyderabad, Telangana, India, were included in the study from June 15, 2020 to September 30, 2020. The ADRs were classified in to anaphylactic, allergic, and gastrointestinal (nausea/vomiting/heart burns/chest tightness). All ADRs were graded according to CTCAE version 5.0. Suspected drugs, time to reaction, and corrective measures were analyzed. Results During the study period, a total of 8,600 sessions of day care chemotherapy were administered. ADRs were noticed in 83 cases (~1%). Among the reported ADRs, anaphylactic reactions were noted in 20 patients (24%); allergic reactions of grades 1 and 2 were noted in 41 patients (49%). Gastrointestinal ADRs were noted in 30 patients (36%). Adverse reactions are mostly seen in oxaliplatin (22.8%), rituximab (14.4%), paclitaxel (15.6%), carboplatin (13.2%), and docetaxel (7.2%). In grade-I (10%) and grade-II (63%) resections, supportive treatment was provided and chemotherapy was continued. Grade-III ADRs were noted in 21 patients (25%) out of whom, 3 patients required short-term intensive care, chemotherapy was withheld until the next cycle in one patient, and chemotherapy regimen was changed in 3 patients. No patient died of ADR. Conclusion Serious ADRs are rare in contemporary medical oncology practice during day care chemotherapy administration. Most acute ADRs were easily managed.
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Mallouppas, George, Graham Goldin, Yongzhe Zhang, Piyush Thakre, and Jim Rogerson. "Investigation of Flamelet Generated Manifold Reaction Source Term Closure Models Applied to an Industrial Gas Turbine." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90219.

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Abstract Three Flamelet Generated Manifold reaction source term closure options and two different reactor types are examined with Large Eddy Simulation of an industrial gas turbine combustor operating at 3 bar. This work presents the results for the SGT-100 Dry Low Emission (DLE) gas turbine provided by Siemens Industrial Turbomachinery Ltd. The related experimental study was performed at the German Aerospace Centre, DLR, Stuttgart, Germany. The FGM model approximates the thermo-chemistry in a turbulent flame as that in a simple 0D constant pressure ignition reactors and 1D strained opposed-flow premixed reactors, parametrized by mixture fraction, progress variable, enthalpy and pressure. The first objective of this work is to compare the flame shape and position predicted by these two FGM reactor types. The Kinetic Rate (KR) model, studied in this work, uses the chemical rate from the FGM with assumed shapes, which are a Beta function for mixture fraction and delta functions for reaction progress variable and enthalpy. Another model investigated is the Turbulent Flame-Speed Closure (TFC) model with Zimont turbulent flame speed, which propagates premixed flame fronts at specified turbulent flame speeds. The Thickened Flame Model (TFM), which artificially thickens the flame to sufficiently resolve the internal flame structure on the computational grid, is also explored. Therefore, a second objective of this paper is to compare KR, TFC and TFM with the available experimental data.
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Haller, Bénedicte, Jean-Pierre Bonnet, Pierre Fauchais, Alain Grimaud, and Jean-Claude Labbe. "TiC Based Coatings Prepared by Combining SHS and Plasma Spraying." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0666.

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Abstract Obtaining dense ceramic coatings by thermal spraying still remains a challenge. Compared to metals, ceramics have a lower thermal conductivity and a larger melting enthalpy. These factors limit the heat transfer from the plasma to the particles and consequently do not necessarily allow their total melting. Problems linked to this heat transfer can be avoided, or at least limited, by using agglomerated particles made of a mixture of reactive powders yielding the ceramic material, via SHS (Self-propagating High-temperature Synthesis) reaction. In this case, the reaction can be ignited by the heat transfer at the particle surface of an agglomerate and propagate towards the centre during its flight through the plasma. The application of this process to Ti, C mixtures leads to the formation of a dense TiC based coating. The composition of the coating, influenced by the contamination of the surrounding gas entrainment during the spray process, belongs to the TiC-TiO solid solution. The influence of experimental parameters on the coating composition is discussed.
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STRAZDINA, Vija, Valentina FETERE, Liga FEODOROVA-FEDOTOVA, Janis JASKO, and Olga TREIKALE. "REACTION OF WINTER WHEAT GENOTYPES ON THE YELLOW (STRIPE) RUST PUCCINIA STRIIFORMIS, WES." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.124.

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Yellow rust, caused by Puccinia striiformis Wes. is one of the most significant diseases constraint to winter wheat production in the world. Since 2011 in Europe have appeared distinct new races – Warrior, Kranich, Warrior (-) that have caused wide epidemics on different cultivars of wheat. Grain yield losses can be prevented by using a combination of varietal resistance and fungicides. Information on wheat variety susceptibility to local yellow (stripe) rust Puccinia striiformis Wes. races can help to reduce the risk of yield losses in high disease pressure situations. Field trials with eight most popular and perspective winter wheat varieties in Latvia were established in the North-Western part of Latvia (Stende Research Centre) in autumn of 2016. The trial was designed as two randomized complete blocks (treated and untreated) and data were statistically interpreted. Two applications of fungicides at BBCH 29-32 by T1 (prothioconazol 53 g L-1, spiroxamin 224 g L-1, tebucanazole 148 g L-1) and at BBCH 37-39 - T2 (bixafen 65 g L-1, prothioconazol 130 g L-1, fluopyram 65 g L-1- 1.5 L ha-1) were used to control the YR. Yield and 1000 kernel weight (TKW) were determined. Preliminary results indicated the difference between genotypes resistance/susceptibility to YR. The severity of infection level was 1- 80% depending on genotype resistance. Application of fungicides increased grain yield by 2.9 % to 33.0% and TKW by 3.4% - 33.2 % depending on variety. Observations showed the difference in the occurrence of symptoms on YR in different varieties of winter wheat under conditions of 2017 in Stende.
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Siddiqui, Aijaz, and Dibakar Sen. "Contact Pressure as an Indicator of Postural Stability in Digital Human Models." In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1001901.

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This paper presents a natural stability model of Digital Human Models. In the traditional convex-hull-based stability approach, a posture is stable if the Center of Pressure lies within the Base of Support. The posture has no qualitative degree (less/more stable). Additionally, some existing methods use Functional Stability Regions and make the Centre of Pressure lie inside it. Though, this is based solely on experimental observation and lacks reasoning. Hu-mans sense contact/reaction forces. Very low contact pressure may provoke toppling, and high contact pressure induces discomfort. So, humans do not allow forces to rise beyond or recede below certain limits. In this paper, a Sensing-based method that involves estimating pressure at support points is presented to decide whether a posture is stable & comfortable along with its degree. The method provides a rationale for using the Functional Stability Region & applies to any set of support points.
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Yusoff, Mohamad Hazwan, Meor Muhammad Hakeem Meor Hashim, Muhammad Hadi Hamzah, Muhammad Faris Arriffin, and Azlan Mohamad. "Leveraging on Machine Learning Solution for Pioneering Wells Augmented Stuck Pipe Indicator in Real Time Centre." In IADC/SPE Asia Pacific Drilling Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/201037-ms.

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Abstract Stuck pipe incidents remain as one of the major problems in the drilling industry. The incidents will lead to expensive loss time in daily spread cost, bottom hole assembly cost, sidetracking cost as well as fishing cost. The Wells Augmented Stuck Pipe (WASP) Indicator, a state-of-the-art machine learning technology that seamlessly integrates with PETRONAS existing technologies, is introduced as the stuck pipe prevention detection system for the company. Historical real-time drilling data and stuck pipe incidents reports between 2007 and 2019 are used for the development of machine learning models. The models utilize key drilling parameters such as hookload and equivalent circulating density (ECD) to predict and analyze trends to detect any signature pattern anomalies for various stuck pipe events. The prediction and alarm are displayed in real-time monitoring software to trigger the operation team for prompt intervention. The WASP solution has demonstrated proven outcomes using historical and live well with high confidence in detecting stuck pipe incidents due to differential sticking, hole cleaning, and wellbore geometry. The WASP Indicator is envisaged to provide the company with cutting edge advantages in the industry. It is expected that the system will reduce the identification period and improve the reaction time of the monitoring specialists in recognizing the stuck pipe symptoms and highlighting potential incidents. The system is also bringing value to the company via non-productive time (NPT) cost avoidance and identification of early onset of various stuck pipe events based on distinct mechanisms. With the system, the existing portfolio value can be enhanced via setting dynamic trends and models into historical experiences context. The WASP Indicator is aspired to be the forefront innovation that will leap through the norm and lead the region in a greater plan of drilling automation system.
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Paul, Sreebash C., Manosh C. Paul, and William P. Jones. "LES for NO Prediction in a Propane-Air Turbulent Flame." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37329.

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Formation of nitric oxide (NO) in a model cylindrical combustor is investigated by applying Large Eddy Simulation (LES) technique. Gaseous propane (C3H8) is injected through a circular nozzle attached at the centre of the combustor inlet and preheated air with temperature of 773K is supplied through the annulus surrounding of the nozzle. The non-premixed combustion process is modelled via conserved scalar approach with laminar flamelet model, while in NO formation model, the extended Zeldovich (thermal) reaction mechanism is taken into account through a transport equation for NO mass fraction. In LES the governing equations are filtered using a spatial filtering approach to separate the flow field into large scale eddies and small scale eddies. The large scale eddies are resolved explicitly while the small scale eddies are modelled via Smagorinsky model.
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Reports on the topic "Reaction centre"

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Otuka, Naohiko, and BORIS PRITYCHENKO. International Network of Nuclear Reaction Data Centres. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1807954.

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Resasco, Daniel E. Final Technical Report- Center for Interfacial Reaction Engineering. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1408909.

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Dutton, P. (Electron transfer mechanisms in reaction centers). Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5624150.

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Ann. E. McDermott. Photo-CIDNP of Photosyntheitc Reaction Centers. Office of Scientific and Technical Information (OSTI), October 2005. http://dx.doi.org/10.2172/859107.

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Golbeck, John. The Type 1 Homodimeric Reaction Center in Heliobacterium modesticaldum. Office of Scientific and Technical Information (OSTI), January 2018. http://dx.doi.org/10.2172/1416952.

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Burgos, W. D. Reaction-Based Reactive Transport Modeling of Iron Reduction and Uranium Immobilization at Area 2 of the NABIR Field Research Center. Office of Scientific and Technical Information (OSTI), September 2009. http://dx.doi.org/10.2172/963450.

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Mosby, Shea. Neutron-induced reaction studies at the Los Alamos Neutron Science Center. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1160108.

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8

Weber, S., J. R. Norris, T. Berthold, E. Ohmes, G. Kothe, and M. C. Thurnauer. Nuclear coherences in photosynthetic reaction centers following light excitation. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/515524.

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van Willigen, H. Magnetic resonance studies of photosynthetic reaction centers and porphyrins. Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/6551500.

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Nelson, Nathan, and Charles F. Yocum. Structure, Function and Utilization of Plant Photosynthetic Reaction Centers. United States Department of Agriculture, September 2012. http://dx.doi.org/10.32747/2012.7699846.bard.

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Light capturing and energy conversion by PSI is one of the most fundamental processes in nature. In the heart of these adaptations stand PSI, PSII and their light harvesting antenna complexes. The main goal of this grant proposal was to obtain by X-ray crystallography information on the structure of plant photosystem I (PSI) and photosystem II (PSII) supercomplexes. We achieved several milestones along this line but as yet, like several strong laboratories around the world, we have no crystal structure of plant PSII. We have redesigned the purification and crystallization procedures and recently solved the crystal structure of the PSI supercomplex at 3.3 Å resolution. Even though this advance in resolution appears to be relatively small, we obtained a significantly improved model of the supercomplex. The work was published in J. Biol. Chem. (Amunts et al., 2010). The improved electron density map yielded identification and tracing of the PsaK subunit. The location of an additional 10 ß-carotenes, as well as 5 chlorophylls and several loop regions that were previously uninterruptable have been modeled. This represents the most complete plant PSI structure obtained thus far, revealing the locations of and interactions among 17 protein subunits and 193 non-covalently bound photochemical cofactors. We have continued extensive experimental efforts to improve the structure of plant PSI and to obtain PSII preparation amenable to crystallization. Most of our efforts were devoted to obtain well-defined subcomplexes of plant PSII preparations that are amenable to crystallization. We studied the apparent paradox of the high sensitivity of oxygen evolution of isolated thylakoids while BBY particles exhibit remarkable resilience to the same treatment. The integrity of the photosystem II (PSII) extrinsic protein complement as well as calcium effects arise from the Ca2+ atom associated with the site of photosynthetic water oxidation were investigated. This work provides deeper insights into the interaction of PsbO with PSII. Sight-directed mutagenesis indicated the location of critical sites involved in the stability of the water oxidation reaction. When combined with previous results, the data lead to a more detailed model for PsbO binding in eukaryotic PSII.
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