Energy transfer between antenna complexes in the purple sulfur bacteria Chromatium tepidum and Chromatium vinosum

1995 ◽  
Vol 194 (2-3) ◽  
pp. 285-289 ◽  
Author(s):  
John T.M. Kennis ◽  
Thijs J. Aartsma ◽  
Jan Amesz
Keyword(s):  
Energy Transfer ◽  
Chromatium Vinosum ◽  
Purple Sulfur Bacteria ◽  
Sulfur Bacteria

Notizen: Formation of Erythroascorbic Acid and 2,3-Enediol Pentonic Acid from ʟ-Ascorbic Acid by Purple Sulfur Bacteria

1978 ◽  
Vol 33 (9-10) ◽  
pp. 789-792 ◽  
Author(s):  
Eckhard Bast ◽  
Friedhelm Marx ◽  
Konrad Pfeilsticker
Keyword(s):  
Ascorbic Acid ◽  
Slow Growth ◽  
Uv Spectra ◽  
Electron Donors ◽  
Chromatium Vinosum ◽  
Purple Sulfur Bacteria ◽  
Thiocapsa Roseopersicina ◽  
Sulfur Bacteria ◽  
Brown Colour ◽  
Phototrophic Growth

Abstract Phototrophic growth of Chromatium vinosum strain D on pyruvate or malate, and of Thiocapsa roseopersicina strain 6311 on malate or sulfide as sole electron donors was promotedby 5 mᴍ ʟ-ascorbate, while growth of T. roseopersicina on fructose was inhibited. Slow growth was obtained also with ascorbate alone. In ascorbate-containing cultures the medium developed a yellow to red-brown colour which showed an absorption maximum at 310 -320 nm. As colourless products of ʟ-ascorbic acid degradation by the two strains examined erythroascorbic acid and 2,3-enediol pentonic acid were found in cell-free culture filtrates by gas chromatographic analysis of the silylated residues and identified by their mass, IR and UV spectra.

Phototrophic purple sulfur bacteria as heat engines in the South Andros Black Hole

2007 ◽  
Vol 95 (2-3) ◽  
pp. 261-268 ◽  
Author(s):  
Rodney A. Herbert ◽  
Andrew Gall ◽  
Takashi Maoka ◽  
Richard J. Cogdell ◽  
Bruno Robert ◽  
...  
Keyword(s):  
Black Hole ◽  
Purple Sulfur Bacteria ◽  
The South ◽  
Heat Engines ◽  
Sulfur Bacteria

Thiosulfate and Sulfur Oxidation in Purple Sulfur Bacteria

2008 ◽  
pp. 101-116 ◽  
Author(s):  
Frauke Grimm ◽  
Bettina Franz ◽  
Christiane Dahl
Keyword(s):  
Sulfur Oxidation ◽  
Purple Sulfur Bacteria ◽  
Sulfur Bacteria

Effects of Metabolism and Physiology on the Production of Okenone and Bacteriochlorophyllain Purple Sulfur Bacteria

2013 ◽  
Vol 31 (2) ◽  
pp. 128-137 ◽  
Author(s):  
Derek Smith ◽  
James Scott ◽  
Andrew Steele ◽  
George Cody ◽  
Shohei Ohara ◽  
...  
Keyword(s):  
Purple Sulfur Bacteria ◽  
Sulfur Bacteria

scholarly journals On uncorrelated inter-monomer Förster energy transfer in Fenna–Matthews–Olson complexes

2019 ◽  
Vol 16 (151) ◽  
pp. 20180882 ◽  
Author(s):  
Adam Kell ◽  
Anton Yu. Khmelnitskiy ◽  
Tonu Reinot ◽  
Ryszard Jankowiak
Keyword(s):  
Energy Transfer ◽  
Green Sulfur Bacteria ◽  
Coupling Constants ◽  
Electronic Coupling ◽  
Reaction Centre ◽  
Sulfur Bacteria ◽  
Fmo Protein ◽  
Reduced Density ◽  
Light Harvesting Antenna ◽  
Pigment Protein Complex

The Fenna–Matthews–Olson (FMO) light-harvesting antenna protein of green sulfur bacteria is a long-studied pigment–protein complex which funnels energy from the chlorosome to the reaction centre where photochemistry takes place. The structure of the FMO protein from Chlorobaculum tepidum is known as a homotrimeric complex containing eight bacteriochlorophyll a per monomer. Owing to this structure FMO has strong intra-monomer and weak inter-monomer electronic coupling constants. While long-lived (sub-picosecond) coherences within a monomer have been a prevalent topic of study over the past decade, various experimental evidence supports the presence of subsequent inter-monomer energy transfer on a picosecond time scale. The latter has been neglected by most authors in recent years by considering only sub-picosecond time scales or assuming that the inter-monomer coupling between low-energy states is too weak to warrant consideration of the entire trimer. However, Förster theory predicts that energy transfer of the order of picoseconds is possible even for very weak (less than 5 cm –1 ) electronic coupling between chromophores. This work reviews experimental data (with a focus on emission and hole-burned spectra) and simulations of exciton dynamics which demonstrate inter-monomer energy transfer. It is shown that the lowest energy 825 nm absorbance band cannot be properly described by a single excitonic state. The energy transfer through FMO is modelled by generalized Förster theory using a non-Markovian, reduced density matrix approach to describe the electronic structure. The disorder-averaged inter-monomer transfer time across the 825 nm band is about 27 ps. While only isolated FMO proteins are presented, the presence of inter-monomer energy transfer in the context of the overall photosystem is also briefly discussed.

A Study of the Performance of a High-Rate Photosynthetic Pond System

1987 ◽  
Vol 19 (12) ◽  
pp. 237-241 ◽  
Author(s):  
H. M. Pinheiro ◽  
M. T. Reis ◽  
J. M. Novais
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Operating Conditions ◽  
High Rate ◽  
Purple Sulfur Bacteria ◽  
Residence Times ◽  
Sulfate Reducing ◽  
Pond System ◽  
Sulfur Bacteria ◽  
Colour Changes ◽  
Reducing Bacteria

Colour changes and other marked disturbances were observed at a high-rate photosynthetic pond system at Alcochete, Portugal. Previous chemical and microbiological tests made it possible to attribute these occurrences to the proliferation of purple sulfur bacteria, following the probable production of sulfide inside the ponds by sulfate-reducing bacteria. Results from more recent tests and observations are presented, which confirm the earlier conclusions, in addition to revealing a number of inadequacies in the ponds chosen operating conditions, which are in all probability at the origin of the observed disturbances. Corrective actions planned include a more efficient mixing of pond contents, the strict prevention of contamination with salty estuarine waters and the control of residence times and bottom sludge accumulation.

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