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Saturday, August 1, 2020 | History

2 edition of Pressure effects on the photochemistry of bacterial photosynthetic reaction centers found in the catalog.

Pressure effects on the photochemistry of bacterial photosynthetic reaction centers

Curtis Wendell Hoganson

Pressure effects on the photochemistry of bacterial photosynthetic reaction centers

by Curtis Wendell Hoganson

  • 308 Want to read
  • 33 Currently reading

Published .
Written in

    Subjects:
  • Photosynthetic bacteria.,
  • Photochemistry.

  • Edition Notes

    Statementby Curtis Wendell Hoganson.
    The Physical Object
    Paginationxi, 123 leaves, bound :
    Number of Pages123
    ID Numbers
    Open LibraryOL16971013M

    Photochemistry is the branch of chemistry concerned with the chemical effects of light.()The breadth of scientific and technological interests in the general topic of photochemistry is truly enormous and includes, for example, such diverse areas as microelectronics, atmospheric chemistry, organic synthesis, non-conventional photoimaging, photosynthesis, solar . We hypothesized that chloroplast energy imbalance sensed through alterations in the redox state of the photosynthetic electron transport chain, measured as excitation pressure, governs the extent of variegation in the immutans mutant of Arabidopsis thaliana. To test this hypothesis, we developed a nondestructive imaging technique and used it to quantify the extent of variegation in vivo as a.

    The first group includes reaction medium, reaction mixture composition, temperature, isotope effects to name the most important. The distinctive feature of photochemical reactions is that these parameters almost always operate under conditions when one or more photophysical processes compete with a . Antigua, Book of Abstracts p. VII A. Freiberg, L. Kangur () “Stability of integral membrane proteins un-der high hydrostatic pressure: The antenna and reaction centre pigment-protein complexes from photosynthetic purple bacteria”. Light-Harvesting Processes. March 10–14, Banz Monastery, Germany, Book of Abstracts p.

    Photosynthetic Reaction Center. por Johann Deisenhofer,J. R. Norris. Photosynthetic Reaction Center, Two-Volume Set (Book 2) ¡Gracias por compartir! Has enviado la siguiente calificación y reseña. Lo publicaremos en nuestro sitio después de haberla revisado. The reaction center is a complex of protein and pigments (such as chlorophyll) that is the functional center of the photosystem. The light reactions of photosynthesis begin when a photon, or small.


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Pressure effects on the photochemistry of bacterial photosynthetic reaction centers by Curtis Wendell Hoganson Download PDF EPUB FB2

Pressure effects on the photochemistry of bacterial photosynthetic reaction centers from Rhodobacter sphaeroides R and Rhodopseudomonas viridis Author links open overlay panel Curtis W. Hoganson a ∗ Maurice W. Windsor a Daniel I. Farkas b ∗∗ William W.

Parson b. The effect of pressure up to 6 kbars on the near to mid infrared absorption spectrum (, cm(-1) or nm) of the oxidized reaction center of Rhodobacter sphaeroides is measured and.

High-pressure studies on the photochemical reaction center from the photosynthetic bacterium Rhodobacter sphaeroides, strain R, shows that, up to. Curtis W. Hoganson, Maurice W. Windsor, Daniel I. Farkas and William W. Parson, Pressure effects on the photochemistry of bacterial photosynthetic reaction centers from Rhodobacter sphaeroides R and Rhodopseudomonas viridis, Biochimica et Biophysica Acta (BBA) - Bioenergetics,3, Cited by: High-pressure tuning of primary photochemistry in bacterial photosynthesis: membrane-bound versus detergent-isolated reaction centers.

Photosynthesis Research(2), DOI: / by: 1. Abstract. Studies of the effects of pressure on the various electron transfer reactions, both forward and backward, that mediate charge separation and recombination in bacterial reaction centers, can provide useful information on changes in conformation and distances involving the various chromophores and their protein scaffolding that may accompany these movements of charge.

This chapter discusses the structure, spectroscopy, and photochemistry of carotenoids bound to photosynthetic bacterial reaction centers (RCs).

All RCs isolated from wild-type strains of purple photosynthetic bacterial species contain one specifically bound carotenoid molecule per RC pigment–protein complex. Mercuric contamination of aqueous cultures results in impairment of viability of photosynthetic bacteria primarily by inhibition of the photochemistry of the reaction center (RC) protein.

Isolated reaction centers (RCs) from Rhodobacter sphaeroides were exposed to Hg2+ ions up to saturation concentration (~ [Hg2+]/[RC]) and the gradual time- and concentration-dependent. This volume contains the contributions from the speakers at the NATO Advanced Research Workshop on "Structure of the Photosynthetic Bacterial Reaction Center X-ray Crystallography and Optical Spectroscopy with Polarized Light" which was held at the "Maison d'Hotes" of the Centre d'Etudes Nucleaires de Cadarache in the South of France, September, Langmuir-blodgett monolayer films of bacterial photosynthetic membranes and isolated reaction centers: preparation, spectrophotometric and electrochemical characterization.

Biochimica et Biophysica Acta (BBA) - Bioenergetics(2), Kõu Timpmann, Erko Jalviste, Manoop Chenchiliyan, Liina Kangur, Michael R. Jones, Arvi Freiberg, High-pressure tuning of primary photochemistry in bacterial photosynthesis: membrane-bound versus detergent-isolated reaction centers, Photosynthesis Research, /sz.

The photosynthetic reaction center (RC) is a membrane pigment–protein complex that catalyzes the initial charge separation reactions of photosynthesis. Following photoexcitation, the RC undergoes conformational relaxations which stabilize the charge-separated state.

Dehydration of the complex inhibits its co Photofunction Proteins. Bacteria are capable of undertaking oxygenic or anoxygenic photosynthesis. Cyanobacteria are competent at extracting electrons from water and performing oxygenic photosynthesis.

Like Eukarya, they possess two PSs, but lack the compartmentalization of the processes in specialized organelles. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.

This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water – hence the name photosynthesis, from the Greek phōs (), "light", and sunthesis (σύνθεσις.

The second mechanism shows up in photosynthetically active sub-cell complexes in suspension (e.g. photosynthetic reaction centers). There, the electric field which is formed in the reaction center, following the light induced electron transfer process, causes a micro electrostriction effect with a change in the molecular volume.

This, in turn. Charge Separation in Photosynthetic Reaction Centers. Reaction centers (RCs) are pigment-protein complexes that carry out the initial photochemical electron-transfer reactions of plants and photosynthetic bacteria.

The structures of RCs from the purple bacterial species Rhodopseudomonas viridis and Rhodobacter sphaeroides have been solved by X-ray crystallography []. Site-Directed Mutations Affecting Primary Photochemistry in Reaction Centers: Effects of Dissymmetry in the Special Pair W.W.

PARSON, V. NAGARAJAN, D. GAUL, C.C. SCHENCK, Z.-T. CHU and A. WARSHEL Electrostatic Effects on the Speed and Directionality of Electron Transfer in Bacterial Reaction Centers: The Special Role of Tyrosine M Reaction Centers of Photosynthetic Bacteria is an updated record on the most recent insight into the struc- ture/function relationship of reaction centers from photosynthetic bacteria.

It addresses in particular, interactions and dynamics which determine the ultra-high quantum yield of photoinduced charge separation in these energy-transforming molecular machines. In bacterial photosynthesis it has been proposed that an electron is transferred from the excited singlet state (P∗) of theprimary electron donor first to a bacteriochlorophyll (BChl) molecule, gen.

Photochemistry Bacterial JOUR. T1 - Carotenoid excited-state properties in photosynthetic purple bacterial reaction centers. T2 - Effects of the protein environment.

AU - Pan, Jie. AU - Lin, Su. A new kind of bio-nanocomposite photoelectrode was fabricated through directimmobilization of the bacterial photosynthetic reaction center (RC. In this study, we develop a mechanistic understanding of how temperature affects growth and photosynthesis in 10 geographically and physiologically diverse strains of Synechococcus spp.

We found that Synechococcus spp. are able to regulate photochemistry over a range of temperatures by using state transitions and altering the abundance of photosynthetic proteins.Anisotropic Magnetic Field Effects of the Photosynthetic Bacterial Reaction Center of Rhodobacter sphaeroides R, Studied by Linear Dichroic Magneto-optical Difference Spectroscopy (LD-MODS) in the Temperature Range K.- Bacterial Reaction Centers are Intrinsically HeterogeneousMimicking bacterial photosynthesis Devens Gust, Thomas A.

Moore and Ana L. Moore Department of Chemistry and Biochemistry and Center for the Study of Early Events in Photosynthesis, Arizona State University, Tempe, AZ Abstract: Photosynthesis in bacteria involves absorption of .