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Статті в журналах з теми "Reaction centre"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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Анотація:

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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9

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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10

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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11

Mullineaux, Conrad W. "Phycobilisome-reaction centre interaction in cyanobacteria." Photosynthesis Research 95, no. 2-3 (October 6, 2007): 175–82. http://dx.doi.org/10.1007/s11120-007-9249-y.

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12

Fyfe, P. K., and M. R. Jones. "Lipids in and around photosynthetic reaction centres." Biochemical Society Transactions 33, no. 5 (October 26, 2005): 924–30. http://dx.doi.org/10.1042/bst0330924.

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Анотація:

Reaction centres are membrane-embedded pigment–protein complexes that transduce the energy of sunlight into a biologically useful form. The most heavily studied reaction centres are the PS-I (Photosystem I) and PS-II complexes from oxygenic phototrophs, and the reaction centre from purple photosynthetic bacteria. A great deal is known about the compositions and structures of these reaction centres, and the mechanism of light-activated transmembrane electron transfer, but less is known about how they interact with other components of the photosynthetic membrane, including the membrane lipids. X-ray crystallography has provided high-resolution structures for PS-I and the purple bacterial reaction centre, and revealed binding sites for a number of lipids, either embedded in the protein interior or attached to the protein surface. These lipids play a variety of roles, including the binding of cofactors and the provision of structural support. The challenges of modelling surface-associated electron density features such as lipids, detergents, small amphiphiles and ions are discussed.

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13

Stuzhin, Pavel A., and Ol'ga G. Khelevina. "Azaporphyrins: structure of the reaction centre and reactions of complex formation." Coordination Chemistry Reviews 147 (January 1996): 41–86. http://dx.doi.org/10.1016/0010-8545(94)01126-5.

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14

FORD, ROBERT C., IMELDA M. GALLAGHER, and MICHAEL C. W. EVANS. "Investigations of Photosystem II reaction centre components." Biochemical Society Transactions 14, no. 1 (February 1, 1986): 54. http://dx.doi.org/10.1042/bst0140054.

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15

Barber, Jim. "A new type of photosynthetic reaction centre." Trends in Biochemical Sciences 10, no. 6 (June 1985): 218–19. http://dx.doi.org/10.1016/0968-0004(85)90131-8.

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16

Ford, Robert C., Daniel Picot, and R. Michael Garavito. "Crystallization of the photosystem I reaction centre." EMBO Journal 6, no. 6 (June 1987): 1581–86. http://dx.doi.org/10.1002/j.1460-2075.1987.tb02403.x.

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17

Nagy, László, Kata Hajdu, Szabolcs Torma, Sándor Csikós, Tibor Szabó, Melinda Magyar, Dóra Fejes, et al. "Photosynthetic reaction centre/carbon nanotube bundle composites." physica status solidi (b) 251, no. 12 (November 13, 2014): 2366–71. http://dx.doi.org/10.1002/pssb.201451154.

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18

Altamura, Emiliano, Paola Albanese, Pasquale Stano, Massimo Trotta, Francesco Milano, and Fabio Mavelli. "Charge Recombination Kinetics of Bacterial Photosynthetic Reaction Centres Reconstituted in Liposomes: Deterministic Versus Stochastic Approach." Data 5, no. 2 (June 12, 2020): 53. http://dx.doi.org/10.3390/data5020053.

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In this theoretical work, we analyse the kinetics of charge recombination reaction after a light excitation of the Reaction Centres extracted from the photosynthetic bacterium Rhodobacter sphaeroides and reconstituted in small unilamellar phospholipid vesicles. Due to the compartmentalized nature of liposomes, vesicles may exhibit a random distribution of both ubiquinone molecules and the Reaction Centre protein complexes that can produce significant differences on the local concentrations from the average expected values. Moreover, since the amount of reacting species is very low in compartmentalized lipid systems the stochastic approach is more suitable to unveil deviations of the average time behaviour of vesicles from the deterministic time evolution.

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19

BILLING, GERT D. "The reaction-volume Hamiltonian for polyatomic three-centre reactions: the classical Hamiltonian." Molecular Physics 89, no. 2 (October 1996): 355–72. http://dx.doi.org/10.1080/002689796173778.

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20

Critchley, C. "The Molecular Mechanism of Photoinhibition — Facts and Fiction." Functional Plant Biology 15, no. 2 (1988): 27. http://dx.doi.org/10.1071/pp9880027.

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In this paper, the evidence supporting two different models for the molecular mechanism of photoinhibition is discussed. One hypothesis centres around the suggestion that photoinhibition is due to the loss of the herbicide-binding Dl polypeptide of photosystem II. The other model suggests that damage to a functional group in the reaction centre is the primary cause of photoinhibition. In order to put the apparent controversy into context, recent developments in our understanding of the structure and function of the photosystem II reaction centre are described. Interpretation and judgement of all available evidence suggest primary photoinhibitory damage to be incurred by the reaction-centre chlorophyll P680 destabilising the apoprotein(s) and eventually resulting in their proteolytic degradation and removal from the photosystem II complex and the thylakoid membrane.

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21

Bogduk, N., B. Amevo, and M. Pearcy. "A Biological Basis for Instantaneous Centres of Rotation of the Vertebral Column." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 209, no. 3 (September 1995): 177–83. http://dx.doi.org/10.1243/pime_proc_1995_209_341_02.

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The instantaneous centre of rotation has proven to be a useful parameter of vertebral motion. The normal location of instantaneous centres has been determined in cadavers and in normal volunteers for the cervical, thoracic and lumbar spines, and abnormal location of centres has been shown to correlate with spinal pain. However, to date, an instantaneous centre has constituted no more than a convenient mathematical summary of vertebral kinematics. It has defied resolution into biologically meaningful parameters. This study offers a novel model of vertebral motion in which the instantaneous centre of rotation can be shown to be a function of the location of the centre of reaction of a vertebra, and the intrinsic rotation and translation it undergoes. These parameters are strictly linked by equations that determine the location of an axis of rotation. These equations allow aberrations in the location of an axis to be interpreted in terms of the anatomical and pathological factors that affect the centre of reaction of the vertebra and the rotation and translation it undergoes.

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22

Köhler, J., A. M. van Oijen, M. Ketelaars, C. Hofmann, M. Matsushita, T. J. Aartsma, and J. Schmidt. "Optical Spectroscopy of Individual Photosynthetic Pigment Protein Complexes." International Journal of Modern Physics B 15, no. 28n30 (December 10, 2001): 3633–36. http://dx.doi.org/10.1142/s0217979201008317.

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Photosynthesis is the process by which plants, algae and photosynthetic bacteria convert solar energy into a form that can be used to sustain the life process. The light reactions occur in closely coupled pigment systems. The energy is absorbed by a network of antenna pigment proteins and efficiently transferred to the photochemical reaction centre where a charge separation takes place providing the free energy for subsequent chemical reactions. The total conversion process, starting with the absorption of a photon and ending with a stable charge separated state occurs within less than 50 ps and has an overall quantum yield of more than 90%. The success of this natural process is based on both the highly efficient absorption of photons by the light-harvesting antenna system and the rapid and efficient transfer of excitation energy to the reaction centre. It is known that most photosynthetic purple bacteria contain two types of antenna complexes, light-harvesting complex 1 (LH1) and light harvesting complex 2 (LH2) which both have a ring-like structure [1,2]. (Some bacterial species like Rhodopseudomonas acidophila contain a third light-harvesting complex termed B800-820.) The reaction centre (RC) presumably forms the core of the LH1 complex, while LH2 complexes are arranged around the perimeter of the LH1 ring in a two-dimensional structure. However the full three-dimensional structure of the whole photosynthetic unit is as yet unknown. The absorption of a photon (mainly) takes place in the LH2 pigments followed by a fast transfer of the excitation energy to the LH1 complex and subsequently to the reaction centre. It appears that the whole structure is highly optimized for capturing light energy and to funnel it to the reaction centre [3-7].

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23

Trottier-Tellier, Félix, Laurence Harvey, and Jean-Daniel Baillargeon. "Risk Evaluation of Endoscopic Retrograde Cholangiopancreatography-Related Contrast Media Allergic-Like Reaction: A Single Centre Experience." Canadian Journal of Gastroenterology and Hepatology 2018 (2018): 1–5. http://dx.doi.org/10.1155/2018/6296071.

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Background and Aims.Few cases of endoscopic retrograde cholangiopancreatography- (ERCP-) related contrast media (CM) adverse reactions have been reported in the current literature. There is a lack of standardisation in practice regarding premedication prophylaxis for at-risk patients undergoing ERCP and there are few data to guide the practitioners. Our goal is to evaluate the risk of CM adverse reaction in a group of patients with a past history of allergic-like reaction to iodine product undergoing ERCP.Methods.A retrospective chart review study was performed of patients who underwent ERCP at our single centre from January 2010 to December 2015.Results.2295 ERCPs were performed among 1766 patients. No anaphylactoid or severe adverse reaction occurred. One (0.04%) ERCP-related CM benign reaction was reported in a patient known for penicillin allergy. Among 127 ERCPs performed on patients with a prior adverse reaction to iodine, 121 procedures were done without and 6 with a premedication prophylaxis. In both groups, no ERCP-related CM reaction occurred.Conclusions.To our knowledge, we report the largest cohort of iodine allergic patients undergoing ERCP ever published. These results suggest that ERCP-related CM adverse reactions are very rare even among patients at risk for CM reaction.

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24

GALLAGHER, Stephen C., Richard CAMMACK, and Howard DALTON. "Electron transfer reactions in the alkene mono-oxygenase complex from Nocardia corallina B-276." Biochemical Journal 339, no. 1 (March 25, 1999): 79–85. http://dx.doi.org/10.1042/bj3390079.

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Nocardia corallina B-276 possesses a multi-component enzyme, alkene mono-oxygenase (AMO), that catalyses the stereoselective epoxygenation of alkenes. The reductase component of this system has been shown by EPR and fluorescence spectroscopy to contain two prosthetic groups, an FAD centre and a [2Fe–2S] cluster. The role of these centres in the epoxygenation reaction was determined by midpoint potential measurements and electron transfer kinetics. The order of potentials of the prosthetic groups of the reductase were FAD/FAD• = -216 mV, [2Fe–2S]/[2Fe–2S]• = -160 mV and FAD•/FAD•• = -134 mV. Combined, these data implied that the reductase component supplied the energy required for the epoxygenation reaction and allowed a prediction of the mechanism of electron transfer within the AMO complex. The FAD moiety was reduced by bound NADH in a two-electron reaction. The electrons were then transported to the [2Fe–2S] centre one at a time, which in turn reduced the di-iron centre of the epoxygenase. Reduction of the di-iron centre is required for oxygen binding and substrate oxidation.

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25

Deligiannakis, Y., and A. W. Rutherford. "Reaction centre photochemistry in cyanide-treated photosystem II." Biochimica et Biophysica Acta (BBA) - Bioenergetics 1365, no. 3 (July 1998): 354–62. http://dx.doi.org/10.1016/s0005-2728(98)00091-7.

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26

Giustini, Mauro, Cristina Bellinazzo, Luciano Galantini, Antonia Mallardi, Gerardo Palazzo, Simona Sennato, Federico Bordi, and Kari Rissanen. "Incorporation of the bacterial reaction centre into dendrimersomes." Colloids and Surfaces A: Physicochemical and Engineering Aspects 413 (November 2012): 38–43. http://dx.doi.org/10.1016/j.colsurfa.2012.01.040.

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27

Deisenhofer, J., and H. Michel. "The photosynthetic reaction centre from the purple bacterium." Bioscience Reports 9, no. 6 (December 1, 1989): 763. http://dx.doi.org/10.1007/bf01114815.

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28

Szakal, A. K., and J. G. Tew. "Significance of iccosomes in the germinal centre reaction." Research in Immunology 142, no. 3 (January 1991): 261–63. http://dx.doi.org/10.1016/0923-2494(91)90072-q.

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29

Terashima, K., M. Dobashi, K. Maeda, and Y. Imai. "Cellular components involved in the germinal centre reaction." Research in Immunology 142, no. 3 (January 1991): 263–68. http://dx.doi.org/10.1016/0923-2494(91)90073-r.

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30

Vila, Leticia, Vanesa Garcia, Oihana Martinez Azcona, Loreley Pineiro, Angela Meijide, and Vanesa Balboa. "Mild to moderate hypersensitivity reactions to beta-lactams in children: a single-centre retrospective review." BMJ Paediatrics Open 3, no. 1 (April 2019): e000435. http://dx.doi.org/10.1136/bmjpo-2019-000435.

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Анотація:

ObjectiveBeta-lactam (BL) antibiotics are the most reported drugs in hypersensitivity reactions in children. More than 90% of these children tolerate the suspected drug after diagnostic work-up. Skin tests (STs) show low sensitivity. Our aim was to assess the performance of drug provocation tests (DPTs) without previous ST in mild and moderate delayed reactions and to propose a new DPT protocol.Design of the studyCharts from 213 children under 15 years of age referred for suspected BL allergy from 2011 to 1013 were reviewed. Prick, intradermal and patch tests were performed with major determinant penicilloyl-polylysine, minor determinant mixture, amoxicillin (AMX), cefuroxime, penicillin G and AMX–clavulamate. Children with negative skin tests underwent DPT. After an initial full dose of antibiotic, DPT was carried on for 3 days at home in patients reacting within the first 3 days of treatment. If the reaction took place from day 4 on of treatment, patients took the antibiotic for 5 days.ResultsWe included 108 girls and 105 boys. Mean age at the time of reaction was 3.66±3.06 years. 195 patients (91.5%) reacted to one BL. 154 reactions (67.2%) were non-immediate. Mild to moderate skin manifestations were most frequently reported. AMX–clavulanate was the most frequently involved (63.4%). DPT confirmed the diagnosis of drug hypersensitivity in 17 (7.3%) cases. These 17 patients had negative ST.ConclusionIn mild and moderate cases of BL hypersensitivity, diagnosis can be performed by DPT without previous ST

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31

Visch, Birgitte M., and Kees-Peter de Roos. "Allergies in Phlebology: A National Survey and Review of Literature." Phlebologie 51, no. 05 (October 2022): 237–44. http://dx.doi.org/10.1055/a-1736-5246.

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Abstract Background Type I and type IV hypersensitivity can play an important role in phlebology with potential severe consequences for patients and treatment results. Methods A review of literature was performed for allergic reactions in patients treated for venous insufficiency and venous leg ulcers (VLU), together with a study in the Dutch and European centre for adverse drug reactions. Besides, we performed a survey among 37 Dutch medical hospitals to investigate the incidence of treatment allergies. Results Hypersensitivity reaction is seen in 46–76% of patient with VLU; about 20% of these reactions are caused by wound dressings products. In 11 centres urticarial and respiratory complaints were seen and 3 systemic allergic reactions in phlebological treatments. In Europe 25 cases of systemic reactions were reported. Conclusion Patients with VLU with slow healing tendency should undergo allergy tests. Type I hypersensitivity with anaphylactic reaction, also to sclerosing fluid or tumescent, is very rare.

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32

Casey, Julia. "Effectiveness of scheduled vital signs assessment during infliximab infusions in detecting infusion reactions: a multi-centre retrospective data review." British Journal of Nursing 31, no. 2 (January 27, 2022): S16—S22. http://dx.doi.org/10.12968/bjon.2022.31.2.s16.

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Purpose: To determine if scheduled vital signs monitoring is useful in the detection of infusion reactions to infliximab (IFX). Methods: The infusion records of 35,988 IFX infusions completed in 2017 were reviewed for infusion reactions that occurred during the infusion, which were then examined further to determine how those infusion reactions were detected. Results: Of the 90 complete infusion reaction records reviewed, no infusion reactions (0) were detected by scheduled vital signs assessment. Conclusions: According to the infusion reaction data reviewed, scheduled vital sign assessment did not detect any infusion reactions and may not be necessary for the purpose of monitoring patients during infusions for early detection of infusion reactions. Previous research into IFX infusion reactions reviewed also concluded that scheduled vital signs assessment may not be helpful in the detection of infusion reactions and, in many cases, vital signs did not vary significantly enough from baseline to signal an infusion reaction.

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33

Shengule, Sudhir R., and Peter Karuso. "Three-Component Mannich-like Reaction of 2-Aminoimidazole." Australian Journal of Chemistry 64, no. 12 (2011): 1617. http://dx.doi.org/10.1071/ch11358.

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A three-component reaction of 2-aminoimidazole with various aldehydes and amines is described that generates 4-substituted 2-aminoimidazoles containing a new chiral centre, a new C–C bond and a new C–N bond. The reactions can be conducted in water and require only sodium carbonate as reagent.

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34

David, Rosme, Chinmay Kulkarni, Savithri Punnapurath, and Princy Louis Palatty. "A Retrospective study of contrast media related adverse drug reactions at tertiary hospital in South India." Indian Journal of Pharmacy and Pharmacology 9, no. 4 (November 15, 2022): 224–30. http://dx.doi.org/10.18231/j.ijpp.2022.041.

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: Adverse drug reaction not only occurs with curative, preventive and palliative drugs but also with diagnostic tools like radio contrast agents which are used for enhancement of images. Timely and incessant reporting of adverse drug reaction with various agents is necessary to reduce the incidence. The study aims to find out the trend of contrast media related adverse drug reactions from 2016 to 2021. A retrospective observational study was conducted on adverse drug reactions reported to the adverse drug reaction monitoring centre at tertiary care hospital in South India. All the adverse drug reactions related to various contrast agents used in computed tomography and magnetic resonance imaging were recorded. Patients’ demographic details, individual contrast agent, clinical manifestations of reactions, severity, causality were mentioned in descriptive statistics. : A total of 218 (16%) adverse drug reaction were reported due to various contrast media including non-ionic iodinated and gadolinium-based agents. The incidence of adverse drug reactions with radio contrast agents varies between 0.23% - 0.35%. 89% of symptoms were itching and rashes. Using the WHO-UMC (Uppsala monitoring centre) causality assessment scale, 87% of adverse drug reactions were categorized as ‘probable’. : Unavoidable and untoward reactions can happen in any patient with any contrast agent. With the introduction of newer agents for last six years reactions continue to occur in same proportion. There is no culprit agent, but being ‘vigilante’ on reactions and timely reporting is necessary.

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35

Purushothaman, Sangeetha. "Adverse Drug Reaction Monitoring in Chronic Obstructive Pulmonary Disease Patients in a Tertiary Care Centre." Journal of Medical Science And clinical Research 05, no. 04 (April 4, 2017): 19884–89. http://dx.doi.org/10.18535/jmscr/v5i4.28.

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36

Mbiya, Wilbes, Risikat Adigun, Thai Tran, Yadana Htwe, and Reuben H. Simoyi. "Oxyhalogen–Sulfur Chemistry: Kinetics and Mechanism of Oxidation of Tiopronin by Acidified Bromate and Aqueous Bromine." Australian Journal of Chemistry 68, no. 2 (2015): 262. http://dx.doi.org/10.1071/ch14126.

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N-2-(Mercaptopropionyl)glycine (MPG) is a free-radical scavenger, a detoxicating synthetic aminothiol which also acts as an antioxidant with a wide range of clinical applications. The oxidation of MPG by aqueous bromine and acidified bromate has been studied by spectrophotometric techniques. The stoichiometry for the reaction of acidic bromate with MPG is 1 : 1, HS(CH3)CH(=O)N(H)CH2COOH + BrO3– → HO3S(CH3)CH(=O)N(H)CH2COOH + Br–, with reaction occurring only at the thiol centre. The involvement of thiyl radicals in the oxidation of MPG competes with a non-radical pathway involving two-electron oxidations of the sulfur centre. A bimolecular rate constant of 5.68 (±0.94) × 103 M–1 s–1 for the direct reaction of MPG with bromine was determined. Electrospray ionization spectral data show that MPG is oxidized through its sulfinic acid, by-passing the unstable sulfenic acid. A simplified reaction network consisting of 19 reactions was simulated and it gave a very good fit to the experimental data.

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37

Tsui, Jordan A., Timothy M. Bolton, and Brian T. Sterenberg. "Tungsten coordination chemistry of 1,4-bisdiphenylphosphinobutadiyne — Synthesis of coordination macrocycles and factors controlling diyne cycloaddition." Canadian Journal of Chemistry 87, no. 1 (January 1, 2009): 197–204. http://dx.doi.org/10.1139/v08-123.

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The 1:1 reaction of [W(CO)4(2-picoline)2] (1) with Ph2PCtriple bondC-Ctriple bondCPPh2 (2) led to {[cis-W(CO)4]2(µ-Ph2PC4PPh2)2} (3), in which two bis(diphenylphosphino)butadiyne ligands bridge two tetracarbonyltungsten centres. Reaction of 1 with excess 2 led to [cis-W(CO)4(Ph2PC4PPh2-κ1-P)2] (4), in which two dangling bis-phosphines are coordinated to one metal centre, and reaction of 2 with two equivalents of 1 led to {[W(2-picoline)(CO)4]2(µ-Ph2PC4PPh2)} (5), in which one ligand bridges two tungsten centres. Combination of 4 and 5 led to the trimeric complex {[cis-W(CO)4]3(µ-Ph2PC4PPh2)3} (6), in which three tetracarbonyltungsten centres are bridged by three bisdiphenylphosphinobutadiyne ligands. The dimeric complex 3 showed no reactivity towards alkyne cycloaddition; however, the trimeric complex 6 undergoes cycloaddition at moderate temperatures to form {[W(CO)4]3[µ3-C12(Ph2P)6]} (8), which contains a cyclododecatrienetriyene ring. Comparison of structural data for the template complexes 3 and 6, as well that of previously described platinum template complexes, suggests that alkyne cycloaddition reactions are favoured by proximity of the alkynyl carbons α to phosphorus in adjacent ligands.Key words: coordination chemistry, diyne, cycloaddition, templated reaction, tungsten.

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38

RIDGE, Justin P., Paul K. FYFE, Katherine E. McAULEY, Marion E. VAN BREDERODE, Bruno ROBERT, Rienk VAN GRONDELLE, Neil W. ISAACS, Richard J. COGDELL, and Michael R. JONES. "An examination of how structural changes can affect the rate of electron transfer in a mutated bacterial photoreaction centre." Biochemical Journal 351, no. 3 (October 24, 2000): 567–78. http://dx.doi.org/10.1042/bj3510567.

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A series of reaction centres bearing mutations at the (Phe) M197 position were constructed in the photosynthetic bacterium Rhodobacter sphaeroides. This residue is adjacent to the pair of bacteriochlorophyll molecules (PL and PM) that is the primary donor of electrons (P) in photosynthetic light-energy transduction. All of the mutations affected the optical and electrochemical properties of the P bacteriochlorophylls. A mutant reaction centre with the change Phe M197 to Arg (FM197R) was crystallized, and a structural model constructed at 2.3 Å (1Å = 0.1nm) resolution. The mutation resulted in a change in the structure of the protein at the interface region between the P bacteriochlorophylls and the monomeric bacteriochlorophyll that is the first electron acceptor (BL). The new Arg residue at the M197 position undergoes a significant reorientation, creating a cavity at the interface region between P and BL. The acetyl carbonyl substituent group of the PM bacteriochlorophyll undergoes an out-of-plane rotation, which decreases the edge-to-edge distance between the macrocycles of PM and BL. In addition, two new buried water molecules partially filled the cavity that is created by the reorientation of the Arg residue. These waters are in a suitable position to connect the macrocycles of P and BL via three hydrogen bonds. Transient absorption measurements show that, despite an inferred decrease in the driving force for primary electron transfer in the FM197R reaction centre, there is little effect on the overall rate of the primary reaction in the bulk of the reaction-centre population. Examination of the X-ray crystal structure reveals a number of small changes in the structure of the reaction centre in the interface region between the P and BL bacteriochlorophylls that could account for this faster-than-predicted rate of primary electron transfer.

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39

Cassidy, RA, and MT Elford. "The Reaction Rate Coefficient for the Clustering of He to Li + at Low Centre of Mass Energies." Australian Journal of Physics 38, no. 4 (1985): 577. http://dx.doi.org/10.1071/ph850577.

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A drift tube-mass spectrometer employing Bradbury-Nielsen grids and the method of Takebe et at. (1982) has been used to determine the reaction rate coefficient for the primary clustering reaction of He to Li + at 80 K at mean centre of mass energies from 10 to 15 meV. The influence of mass discrimination in experiments where reactions are studied by ion sampling of both parent and product ions is discussed.

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40

Hobbs, Sarah J., and Hilary M. Clayton. "Sagittal plane ground reaction forces, centre of pressure and centre of mass in trotting horses." Veterinary Journal 198 (December 2013): e14-e19. http://dx.doi.org/10.1016/j.tvjl.2013.09.027.

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41

Conlan, Brendon, Nicholas Cox, Ji-Hu Su, Warwick Hillier, Johannes Messinger, Wolfgang Lubitz, P. Leslie Dutton, and Tom Wydrzynski. "Photo-catalytic oxidation of a di-nuclear manganese centre in an engineered bacterioferritin ‘reaction centre’." Biochimica et Biophysica Acta (BBA) - Bioenergetics 1787, no. 9 (September 2009): 1112–21. http://dx.doi.org/10.1016/j.bbabio.2009.04.011.

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42

Wei, Qinghua, Xiaochu Ma, Jianghui Chen, Li Niu, Xi Yang, Fei Xia, and Shunying Liu. "A triple-functionalised metal centre-catalyzed enantioselective multicomponent reaction." Organic Chemistry Frontiers 5, no. 19 (2018): 2799–804. http://dx.doi.org/10.1039/c8qo00703a.

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A model of a triple-functionalised metal centre for the discovery of unprecedented enantioselective reactions was exquisitely developed by using a Rh^I/(DHQ)₂PHAL catalyst system via multiple coordination interactions with different ligands and substrates.

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43

Henderson, Richard. "Membrane proteins: Structure of a bacterial photosynthetic reaction centre." Nature 318, no. 6047 (December 1985): 598–99. http://dx.doi.org/10.1038/318598a0.

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44

Krishtalik, Lev I. "Activationless electron transfer in the reaction centre of photosynthesis." Biochimica et Biophysica Acta (BBA) - Bioenergetics 977, no. 2 (November 1989): 200–206. http://dx.doi.org/10.1016/s0005-2728(89)80072-6.

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45

Jones, Michael R., Paul K. Fyfe, Aleksander W. Roszak, Neil W. Isaacs, and Richard J. Cogdell. "Protein–lipid interactions in the purple bacterial reaction centre." Biochimica et Biophysica Acta (BBA) - Biomembranes 1565, no. 2 (October 2002): 206–14. http://dx.doi.org/10.1016/s0005-2736(02)00570-9.

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46

Webber, Andrew N., and Richard Malkin. "Photosystem I reaction-centre proteins contain leucine zipper motifs." FEBS Letters 264, no. 1 (May 7, 1990): 1–4. http://dx.doi.org/10.1016/0014-5793(90)80749-9.

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47

Giardi, Maria T., Jonathan B. Marder, and James Barber. "Herbicide binding to the isolated Photosystem II reaction centre." Biochimica et Biophysica Acta (BBA) - Bioenergetics 934, no. 1 (June 1988): 64–71. http://dx.doi.org/10.1016/0005-2728(88)90120-x.

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48

Deisenhofer, Johann, and Harmut Michel. "The Photosynthetic Reaction Centre from the Purple Bacterium Rhodopseudomonasviridis." Bioscience Reports 24, no. 4-5 (August 10, 2004): 323–61. http://dx.doi.org/10.1007/s10540-005-2737-4.

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We first describe the history and methods of membrane protein crystallization, and show how the structure of the photosynthetic reaction centre from the purple bacterium Rhodopseudomonas viridis was solved. The structure of this membrane protein complex is correlated with its function as a light-driven electron pump across the photosynthetic membrane. Finally we draw conclusions on the structure of the photosystem II reaction centre from plants and discuss the aspects of membrane protein structure.

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49

Fyfe, P. K., J. P. Ridge, K. E. McAuley, A. W. Roszak, R. J. Cogdell, N. W. Isaacs, and M. R. Jones. "Structural studies of the purple bacterial photosynthetic reaction centre." Acta Crystallographica Section A Foundations of Crystallography 56, s1 (August 25, 2000): s268. http://dx.doi.org/10.1107/s0108767300025733.

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50

Cho, Jang-Cheon, Martha D. Stapels, Robert M. Morris, Kevin L. Vergin, Michael S. Schwalbach, Scott A. Givan, Douglas F. Barofsky, and Stephen J. Giovannoni. "Polyphyletic photosynthetic reaction centre genes in oligotrophic marine Gammaproteobacteria." Environmental Microbiology 9, no. 6 (June 2007): 1456–63. http://dx.doi.org/10.1111/j.1462-2920.2007.01264.x.

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