Bibliografías temáticas / Photochemical studies

Literatura académica sobre el tema "Photochemical studies"

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Publicado: 7 de julio de 2024
Última modificación: 7 de julio de 2024

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Artículos de revistas sobre el tema "Photochemical studies"

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A.M., Nasimov. "Photochemical Studies of Bromocresol Purple in Sol-gel Membrane". Journal of Advanced Research in Dynamical and Control Systems 12, SP4 (31 de marzo de 2020): 1156–59. http://dx.doi.org/10.5373/jardcs/v12sp4/20201589.

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Roberts, Joan E., James F. Wishart, Lydia Martinez y Colin F. Chignell. "Photochemical Studies on Xanthurenic Acid¶". Photochemistry and Photobiology 72, n.º 4 (1 de mayo de 2007): 467–71. http://dx.doi.org/10.1562/0031-8655(2000)0720467psoxa2.0.co2.

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Roberts, Joan E., James F. Wishart, Lydia Martinez y Colin F. Chignell. "Photochemical Studies on Xanthurenic Acid¶". Photochemistry and Photobiology 72, n.º 4 (2000): 467. http://dx.doi.org/10.1562/0031-8655(2000)072<0467:psoxa>2.0.co;2.

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Cantrell, A., D. J. McGarvey, J. Roberts, T. Sarna y T. G. Truscott. "Photochemical studies of A2-E". Journal of Photochemistry and Photobiology B: Biology 64, n.º 2-3 (noviembre de 2001): 162–65. http://dx.doi.org/10.1016/s1011-1344(01)00224-x.

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Seotsanyana-Mokhosi, Itumeleng, Nina Kuznetsova y Tebello Nyokong. "Photochemical studies of tetra-2,3-pyridinoporphyrazines". Journal of Photochemistry and Photobiology A: Chemistry 140, n.º 3 (mayo de 2001): 215–22. http://dx.doi.org/10.1016/s1010-6030(01)00427-0.

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Miolo, Giorgia, Sergio Caffieri, Daniela Vedaldi, Francarosa Baccichetti, Christine Marzano, Vittorio Lucchini, Paolo Rodighiero y Francesco Dall’Acqua. "Photochemical and photobiological studies on methylthioangelicins". Il Farmaco 54, n.º 3 (marzo de 1999): 134–44. http://dx.doi.org/10.1016/s0014-827x(99)00006-3.

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Chignell, C. F. "Spin trapping studies of photochemical reactions". Pure and Applied Chemistry 62, n.º 2 (1 de enero de 1990): 301–5. http://dx.doi.org/10.1351/pac199062020301.

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Bielec, Janusz, Barbara Pilas, Tadeusz Sarna y T. George Truscott. "Photochemical studies of porphyrin–melanin interactions". J. Chem. Soc., Faraday Trans. 2 82, n.º 9 (1986): 1469–74. http://dx.doi.org/10.1039/f29868201469.

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Bueno, Claudio y María Victoria Encinas. "Photophysical and Photochemical Studies of Pyridoxamine". Helvetica Chimica Acta 86, n.º 10 (octubre de 2003): 3363–75. http://dx.doi.org/10.1002/hlca.200390279.

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Gómez Castaño, Jovanny, Luc Boussekey, Jean Verwaerde, Myriam Moreau y Yeny Tobón. "Enhancing Double-Beam Laser Tweezers Raman Spectroscopy (LTRS) for the Photochemical Study of Individual Airborne Microdroplets". Molecules 24, n.º 18 (12 de septiembre de 2019): 3325. http://dx.doi.org/10.3390/molecules24183325.

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A new device and methodology for vertically coupling confocal Raman microscopy with optical tweezers for the in situ physico- and photochemical studies of individual microdroplets (Ø ≤ 10 µm) levitated in air is presented. The coupling expands the spectrum of studies performed with individual particles using laser tweezers Raman spectroscopy (LTRS) to photochemical processes and spatially resolved Raman microspectroscopy on airborne aerosols. This is the first study to demonstrate photochemical studies and Raman mapping on optically levitated droplets. By using this configuration, photochemical reactions in aerosols of atmospheric interest can be studied on a laboratory scale under realistic conditions of gas-phase composition and relative humidity. Likewise, the distribution of photoproducts within the drop can also be observed with this setup. The applicability of the coupling system was tested by studying the photochemical behavior of microdroplets (5 µm < Ø < 8 µm) containing an aqueous solution of sodium nitrate levitated in air and exposed to narrowed UV radiation (254 ± 25 nm). Photolysis of the levitated NaNO3 microdroplets presented photochemical kinetic differences in comparison with larger NaNO3 droplets (40 µm < Ø < 80 µm), previously photolyzed using acoustic traps, and heterogeneity in the distribution of the photoproducts within the drop.
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Tesis sobre el tema "Photochemical studies"

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Baker, James R. "Photochemical studies towards stemoamide". Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414177.

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Brookman, Jennifer. "Photochemical studies on selected biomolecules". Thesis, University of the West of Scotland, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398322.

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Buckland, S. J. "Photochemical studies in organophosphorus chemistry". Thesis, City University London, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482525.

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Marsh, R. R. "Studies of some photochemical pericyclic reactions". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375284.

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Cantrell, Ann. "Photochemical studies of organic UVA sunscreens". Thesis, Keele University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323702.

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Gulácsy, Christina Elizabeth. "Photochemical and spectroscopic studies of ketoaziridines". Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698993.

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While alcohols have successfully undergone kinetic resolutions, amines pose a challenge due to their nucleophilic nature. Aziridines were identified as potential substrates as a result of their synthetic utility and reduced nucleophilicity. Using a helical aminopyridine catalyst, the kinetic resolutions of ketoaziridines were explored. Initial attempts revealed anomalous kinetic behaviour [slow conversion and non-first order]. Non-buffered noncatalytic control reactions demonstrated unexpected reaction dynamics, as gauged by HPLC and 1H NMR. Stopped-flow spectroscopy revealed photochemical sensitivity of the aziridine. As a result of this new information, the project evolved into a study of the photochemical behaviour of ketoaziridines and their spectroscopic properties. UV-vis absorbance and fluorescence spectroscopy were used to probe the photochemical reactivity of ketoaziridines. These studies suggested a two-step mechanism where an azomethine ylide formed a reactive intermediate, ultimately to form 2,5-diphenyloxazole. Kinetic analysis revealed the mechanism was autocatalytic with respect to oxazole formation. TD-DFT calculations suggested the mechanism proceeded via a diradical species upon irradiation. This mechanistic route was studied by investigating the presence of a magnetic field effect on the kinetics of absorption and emission changes, in collaboration with the Manchester Institute of Biotechnology. Further studies demonstrated a radical species, derived from the irradiation of aziridine, may be used as a photoinitiator in the polymerization of methyl methacrylate. This work also involved development of a synthetic platform to diphenyloxazoles, where functionality may be installed in the initial steps. Use of this strategy allowed for the synthesis of a natural product, texaline.
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Vaidyalingam, Anand S. "Photochemical studies of zeolite-based systems /". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486401895208909.

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Georgopoulos, Panagiotis Gerasimou Seinfeld John H. Seinfeld John H. "Mathematical studies of photochemical air pollution /". Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-02012007-092322.

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Grosser, E. "Photochemical oxidant air pollution : peroxyacetyl nitrate (PAN) as an indicator of photochemical activity". Master's thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/8282.

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Bibliography: leaves 75-84.
Photochemical smog is formed by the interaction of sunlight with nitrogen oxides and hydrocarbons. These precursors are principally emitted by anthropogenic sources. As the major component of the photochemical oxidants is ozone, it is used as the indicator of photochemical smog and air quality standards today are therefore based on ozone. Another important photochemical oxidant is peroxyacetyl nitrate (PAN). Many authors believe that PAN is a better indicator of photochemical activity than ozone, because PAN has, unlike ozone, no large natural sources. Thus, the occurrence of high PAN concentrations is unequivocally related to anthropogenic pollution. The objectives of this work are to summarise the current research on the formation of photochemical smog with emphasis on PAN and to investigate the photochemical smog situation in South Africa using PAN as an indicator.
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Vanover, Eric. "Photochemical Oxidation Studies of Porphyrin Ruthenium Complexes". TopSCHOLAR®, 2012. http://digitalcommons.wku.edu/theses/1201.

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In nature, transition metal containing enzymes display many biologically important, attractive and efficient catalytic oxidation reactions. Many transition metal catalysts have been designed to mimic the predominant oxidation catalysts in nature, namely, the cytochrome P450 enzymes. Ruthenium porphyrin complexes have been the center of this research and have successfully been utilized, as catalysts, in major oxidation reactions, such as the hydroxylation of alkanes. The present work focuses on photocatalytic studies of aerobic oxidation reactions with well characterized ruthenium porphyrin complexes. The photocatalytic studies of aerobic oxidation reactions of hydrocarbons The photocatalytic studies of aerobic oxidation reactions of hydrocarbons catalyzed by a bis-porphyrin-ruthenium(IV) μ-oxo dimer using atmospheric oxygen as the oxygen source in the absence of co-reductants were investigated. The ruthenium(IV) μ-oxo bisporphyrin (3a-d) was found to catalyze aerobic oxidation of a variety of organic substrates efficiently. By comparison, 3d was found to be a more efficient photocatalyst than the well-known 3a under identical conditions. A KIE at 298K was found to be larger than those observed in autoxidation processes, suggesting a nonradical mechanism that involved the intermediacy of ruthenium(V)-oxo species as postulated. The reactivity order in the series of ruthenium(IV) μ-oxo bisporphyrin complexes follows TPFPP>4- CF3TPP>TPP, and is consistent with expectations based on the electrophilic nature of the ruthenium(IV) μ-oxo bisporphyrin species. The trans-dioxoruthenium(VI) porphyrins have been among the best characterized metal-oxo intermediates and their involvement as the active oxidant in the hydrocarbon oxidation have been extensively studied. In addition to the well-known chemical methods, we developed a novel approach for generation of trans-dioxoruthenium( VI) porphyrins with visible light by extension of the known photoinduced ligand cleavage reactions. A series of trans-dioxoruthenium(VI) porphyrin complexes (6a-d) were photochemically synthesized and spectroscopically characterized by UV-vis, and 1H-NMR.
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Libros sobre el tema "Photochemical studies"

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Natarajan, M. Transport and photochemical modeling studies of atmospheric species. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1987.

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Baigel, David Mark. Time-resolved photochemical studies of Diazine triplet states. Manchester: University of Manchester, 1995.

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Perry, Michael Charles. Studies of factors influencing the photochemical cleavage of water. Birmingham: Aston University. Department of Civil Engineering and Construction., 1986.

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Forch, Brad E. Photochemical ignition studies. II Oxygen-atom two-photon resonance effects. Aberdeen Proving Ground, Md: U.S. Army Ballistic Research Laboratory, 1986.

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Mathi, P. Laser photochemical studies on di-isopropyl ether for oxygen-18 enrichment. Mumbai, India: Bhabha Atomic Research Centre, 2013.

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Control, US/FRG/EC Workshop on Photochemical Ozone Problem and Its. Fourth US/FRG/EC Workshop on Photochemical Ozone Problem and Its Control: Proceedings : urban, regional, and global scale : issues and studies in the 1990s, Marriott Hotel, Charleston, SC, USA, Jine 13-17, 1994. Research Triangle Park, NC: Atmospheric Research and Exposure Assessment Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1995.

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Georges, Le Bras, ed. Chemical processes in atmospheric oxidation: Laboratory studies of chemistry related to tropospheric ozone. New York: Springer, 1997.

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Rocca, Paul Anthony. Photochemical studies of cyano-biphenyl crystals in the presence of electron donors. Salford: University of Salford, 1993.

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United States. National Aeronautics and Space Administration., ed. Atmospherically related studies of O(¹D) and O₂(b¹[Sigma, subscript g, superscript +]): Annual report. [Menlo Park, Calif.]: SRI International, 1998.

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W, Villalta P. y United States. National Aeronautics and Space Administration., eds. Laboratory studies of chemical and photochemical processes relevant to stratospheric ozone: Final report, June 1995-July 1998. [Washington, DC: National Aeronautics and Space Administration, 1998.

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Capítulos de libros sobre el tema "Photochemical studies"

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Yielding, K. Lemone. "Studies of the Binding and Biological Actions of Ethidium". En Photochemical Probes in Biochemistry, 241–59. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0925-0_19.

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Acher, A. y S. Saltzman. "Photochemical Inactivation of Organic Pollutants from Water". En Ecological Studies, 302–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74468-6_15.

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Abreu, Isabel, J. C. Lima, M. Helena Santos, Raymond Brouillard y António L. Maçanita. "Photochemical and Photophysical Studies of an Anthocyanin". En Analytical Use of Fluorescent Probes in Oncology, 423–24. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5845-3_46.

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Barth, Andreas, Vasanthi Jayaraman, Dominique Bourgeois y Martin Weik. "Analytical Time-Resolved Studies Using Photochemical Triggering Methods". En Dynamic Studies in Biology, 369–434. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605592.ch7.

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Morawetz, H. "Studies of Polymers Carrying Medium-Sensitive Fluorophores". En Photophysical and Photochemical Tools in Polymer Science, 85–95. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4726-9_5.

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Miller, William L. "Effects of UV Radiation on Aquatic Humus: Photochemical Principles and Experimental Considerations". En Ecological Studies, 125–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03736-2_7.

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Hancock, Graham y Dwayne E. Heard. "Time-Resolved FTIR Emission Studies of Photochemical Reactions". En Advances in Photochemistry, 1–65. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470133491.ch1.

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Jackson, William M. "Recent Laboratory Photochemical Studies and Their Relationship to the Photochemical Formation of Cometary Radicals". En Comets in the Post-Halley Era, 313–32. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3378-4_14.

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Abraham, Shibu y Richard G. Weiss. "Photochemical and Photophysical Studies of and in Bulk Polymers". En Supramolecular Photochemistry, 443–516. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095300.ch11.

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Frank, Curtis W., Muhammad Amin Gashgari y Steven N. Semerak. "Polymer Blend Thermodynamics: Flory Huggins Theory and Its Application to Excimer Fluorescence Studies". En Photophysical and Photochemical Tools in Polymer Science, 523–46. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4726-9_23.

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Actas de conferencias sobre el tema "Photochemical studies"

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Tani, Toshiro. "Studies on Photochemical Hole Burning in Japan". En Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.thd1.

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Oian, Chad A., Jie Zhang, Robert J. Thomas y Jennifer J. Hunter. "Estimation of retina thermal response in photochemical damage studies". En ILSC® 2017: Proceedings of the International Laser Safety Conference. Laser Institute of America, 2017. http://dx.doi.org/10.2351/1.5056869.

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Shyju, T. S. y R. Gopalakrishnan. "Studies on lead sulphide thin films deposited by photochemical method". En 2013 International Conference on Advanced Nanomaterials and Emerging Engineering Technologies (ICANMEET). IEEE, 2013. http://dx.doi.org/10.1109/icanmeet.2013.6609311.

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Jaeger, K., R. Weller y Otto Schrems. "FTIR studies of photochemical reactions of carbonyl sulfide with ozone". En Luebeck - DL tentative, editado por Herbert M. Heise, Ernst H. Korte y Heinz W. Siesler. SPIE, 1992. http://dx.doi.org/10.1117/12.56319.

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Lowes, T. D. y D. T. Cassidy. "Photochemical etching of n-InP: temperature, power and frequency studies". En International Conference on Indium Phosphide and Related Materials. IEEE, 1990. http://dx.doi.org/10.1109/iciprm.1990.203017.

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Fister, Julius C. y Joel M. Harris. "Multichannel Time-Resolved Raman Spectroscopy for Photophysical and Photochemical Studies". En Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.wa.5.

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CCD-detected Raman spectroscopy has been used to study intermediates and nanosecond kinetics in photoinitiated reactions. Multidimensional analysis techniques are used to isolate spectra of individual transient species from those of ground state initiators, photoproducts, reactants and solvent (Fig 1). These methods address several challenges facing Raman analysis of chemical reactions. Overlap in spectra of complex mixtures complicates band assignment and intensity analysis. Raman bands of transient species created in photoinitiated reactions may be difficult to separate from other bands. Multidimensional analysis allows bands to be resolved from spectra in which background subtraction is not feasible. Furthermore, kinetic and spectral information may be simultaneously extracted from the data.
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Myers, Anne B., David L. Phillips, Xiaopei Ci, Curtis L. Westerfield y Jon-Marc Rodier. "Photochemical and spectroscopic studies of small model polyenes related to vision". En OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, editado por Laurence A. Nafie y Henry H. Mantsch. SPIE, 1993. http://dx.doi.org/10.1117/12.145245.

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Gradl, Gerhard, Bryan E. Kohler y Curtis Westerfield. "Photochemical Hole Burning Stark Effect Studies on Octatetrane n-Alkane Mixed Crystals". En Persistent Spectral Hole Burning: Science and Applications. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pshb.1991.thd3.

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Given the enormous increase in resolution that can be realized in hole burning studies, the application of these techniques to determine the spectroscopic consequences of applied electric fields was a natural extension.[1] Much of the work in this area has focused on organic dye molecules in disordered glasses.[1-3] For most of these systems, the application of an electric field most often just broadens the persistent hole, although it has been shown that, in certain cases the orientation averaged effect of a randomly oriented solvent field plus a fixed applied field can lead to a partial splitting of the hole profile.[1,4]
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Eich, Manfred, Martin Sprave, Heike Mauermann, Stefan Stein, Klaus Müllen, Werner Frank y Theo Tschudi. "Studies on Novel Photoselectable Organic NLO-Molecules". En Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.fa2.

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NLO-chromophores of the azobenzene type and of the stilbene type have been used either as dopants or as sidegroups in polymers in order to realize NLO-materials in which the refractive index and the nonlinear susceptibility could be modified optically.1,2 These changes are based on the photochemical transformation of these molecular units from the elongated trans state to the bent cis-state. Since the trans state is the thermodynamically stable state, the cis-isomers generally undergo a thermally activated relaxation back to trans even below the glass transition temperature.3
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Houle, F. A. "Surface Photoprocesses in Laser Assisted Etching and Film Growth". En Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/msba.1989.ma1.

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When simple molecules adsorbed on clean crystals surfaces interact with light dynamical studies can reveal a great deal about the photophysics of absorption, energy relaxation, and stimulated desorption, as well as the dynamics of photochemical reactions.1 In typical photochemical etching and deposition systems, however, surfaces are usually rough and disordered, and reactions involve a wide range of adsorbates which can undergo both photochemical and spontaneous processes. Although this level of complexity would seem to preclude obtaining as detailed a picture as is possible for the methyl halides, for example, rather simple experiments can provide direct and indirect information on important surface photoprocesses. In this talk early efforts to understand microscopic aspects of two very different photochemical systems will be described, with a particular focus on data pertaining to the influence of electronic excitation on adsorption of reactants and desorption of products.
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Informes sobre el tema "Photochemical studies"

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Metiu, Horia. Theoretical Studies of Photochemical Methods for Semiconductor Etching. Fort Belvoir, VA: Defense Technical Information Center, enero de 1990. http://dx.doi.org/10.21236/ada218475.

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Zika, Rod G., Peter J. Milne y Oliver C. Zafiriou. Photochemical Studies of the Eastern Caribbean: An Introductory Overview. Fort Belvoir, VA: Defense Technical Information Center, febrero de 1993. http://dx.doi.org/10.21236/ada267573.

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Miziolek, Andrzej W. y Rosario C. Sausa. Photochemical Ignition Studies. I. Laser Ignition of Flowing Premixed Gases. Fort Belvoir, VA: Defense Technical Information Center, febrero de 1985. http://dx.doi.org/10.21236/ada153048.

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Kinkead, S. A., J. R. FitzPatrick, J. Jr Foropoulos, R. J. Kissane y J. D. Purson. Studies on the photochemical and thermal dissociation synthesis of krypton difluoride. Office of Scientific and Technical Information (OSTI), agosto de 1993. http://dx.doi.org/10.2172/10192656.

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Carraher, Jack McCaslin. Kinetic and mechanistic studies of reactive intermediates in photochemical and transition metal-assisted oxidation, decarboxylation and alkyl transfer reactions. Office of Scientific and Technical Information (OSTI), enero de 2014. http://dx.doi.org/10.2172/1226564.

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Asenath-Smith, Emily, Emma Ambrogi, Lee Moores, Stephen Newman y Jonathon Brame. Leveraging chemical actinometry and optical radiometry to reduce uncertainty in photochemical research. Engineer Research and Development Center (U.S.), septiembre de 2021. http://dx.doi.org/10.21079/11681/42080.

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Subtle aspects of illumination sources and their characterization methods can introduce significant uncertainty into the data gathered from light-activated experiments, limiting their reproducibility and technology transition. Degradation kinetics of methyl orange (MO) and carbamazepine (CM) under illumination with TiO₂ were used as a case study for investigating the role of incident photon flux on photocatalytic degradation rates. Valerophenone and ferrioxalate actinometry were paired with optical radiometry in three different illumination systems: xenon arc (XE), tungsten halogen (W-H), and UV fluorescent (UV-F). Degradation rate constants for MO and CM varied similarly among the three light systems as k W-H < kiv-F < kXE, implying the same relative photon flux emission by each light. However, the apparent relative photon flux emitted by the different lights varied depending on the light characterization method. This discrepancy is shown to be caused by the spectral distribution present in light emission profiles, as well as absorption behavior of chemical actinometers and optical sensors. Data and calculations for the determination of photon flux from chemical and calibrated optical light characterization is presented, allowing us to interpret photo-degradation rate constants as a function of incident photon flux. This approach enabled the derivation of a calibrated ‘rate-flux’ metric for evaluating and translating data from photocatalysis studies.
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Ramamurthy, V. Final report of research supported by DOE Grant No. DE-FG02-96ER14635: Photochemical studies of two component systems within the restricted spaces of zeolites. Office of Scientific and Technical Information (OSTI), mayo de 2002. http://dx.doi.org/10.2172/771227.

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Mallouk, T. E. Studies of photochemically and electrochemically driven electron transport in zeolites. Office of Scientific and Technical Information (OSTI), febrero de 1990. http://dx.doi.org/10.2172/7151388.

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Mallouk, T. E. Studies of photochemically and electrochemically driven electron transport in zeolites: Progress report, April 1988--April 1989. Office of Scientific and Technical Information (OSTI), abril de 1989. http://dx.doi.org/10.2172/6291884.

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Nelson, Nathan y Charles F. Yocum. Structure, Function and Utilization of Plant Photosynthetic Reaction Centers. United States Department of Agriculture, septiembre de 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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