Understanding Biophotocurrent Generation in Photosynthetic Purple Bacteria

ACS Catalysis ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 867-873 ◽  
Author(s):  
Matteo Grattieri ◽  
Zayn Rhodes ◽  
David P. Hickey ◽  
Kevin Beaver ◽  
Shelley D. Minteer
Keyword(s):  
Purple Bacteria ◽  
Photosynthetic Purple Bacteria

B800–B850 coherence correlates with energy transfer rates in the LH2 complex of photosynthetic purple bacteria

2015 ◽  
Vol 17 (46) ◽  
pp. 30805-30816 ◽  
Author(s):  
Cathal Smyth ◽  
Daniel G. Oblinsky ◽  
Gregory D. Scholes
Keyword(s):  
Energy Transfer ◽  
Quantum Information ◽  
Information Science ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Quantum Information Science ◽  
Light Harvesting Complex ◽  
Transfer Rates ◽  
Photosynthetic Purple Bacteria

Delocalization of a model light-harvesting complex is investigated using multipartite measures inspired by quantum information science.

scholarly journals Contribution of low-temperature single-molecule techniques to structural issues of pigment–protein complexes from photosynthetic purple bacteria

2018 ◽  
Vol 15 (138) ◽  
pp. 20170680 ◽  
Author(s):  
Alexander Löhner ◽  
Richard Cogdell ◽  
Jürgen Köhler
Keyword(s):  
Low Temperature ◽  
Single Molecule ◽  
Degrees Of Freedom ◽  
Protein Complexes ◽  
Purple Bacteria ◽  
Structural Models ◽  
Spectral Features ◽  
Light Harvesting Complexes ◽  
Pigment Protein Complexes ◽  
Photosynthetic Purple Bacteria

As the electronic energies of the chromophores in a pigment–protein complex are imposed by the geometrical structure of the protein, this allows the spectral information obtained to be compared with predictions derived from structural models. Thereby, the single-molecule approach is particularly suited for the elucidation of specific, distinctive spectral features that are key for a particular model structure, and that would not be observable in ensemble-averaged spectra due to the heterogeneity of the biological objects. In this concise review, we illustrate with the example of the light-harvesting complexes from photosynthetic purple bacteria how results from low-temperature single-molecule spectroscopy can be used to discriminate between different structural models. Thereby the low-temperature approach provides two advantages: (i) owing to the negligible photobleaching, very long observation times become possible, and more importantly, (ii) at cryogenic temperatures, vibrational degrees of freedom are frozen out, leading to sharper spectral features and in turn to better resolved spectra.

scholarly journals Synthesis of High-Molecular-Weight Polyhydroxyalkanoates by Marine Photosynthetic Purple Bacteria

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0160981 ◽  
Author(s):  
Mieko Higuchi-Takeuchi ◽  
Kumiko Morisaki ◽  
Kiminori Toyooka ◽  
Keiji Numata
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Purple Bacteria ◽  
Photosynthetic Purple Bacteria

Electron Microscopy of Fresh and Dried Cells of Chlorella Pyrenoidosa

1980 ◽  
Vol 38 ◽  
pp. 490-491
Author(s):  
L. P. LIN
Keyword(s):  
Purple Bacteria ◽  
Chlorella Pyrenoidosa ◽  
Spherical Structure ◽  
Hot Air ◽  
Unicellular Algae ◽  
Critical Point Drying ◽  
Photosynthetic Purple Bacteria ◽  
Production Techniques ◽  
Natural Foods ◽  
Spray Dried

Photosynthetic unicellular algae can be cultivated by employing mass production techniques. The harvested Chlorella cells from the mass culturing pools are separated by centrifugation. In the Orient, the pellets are washed and dried in the spray dryer. Finally, the dried powder is packed in vaccum for the starting materials of natural foods. Spray-dried cells of Chlorella were examined by SEM. Most of the droplets of spray-dried cells showed, 50–85μm in diameter (Fig. 1). At the higher magnification, it exhibited that this spherical structure consists of more than a few thousands of single Chlorella cells (Fig. 2), and each cell pilling up or sticking together. The ash-like materials which attached to the surface of cells, probably produced from the cells because of the heat treatment or elevated temperature of hot air from spraying dryers. The cells prepared for SEM by glutaraldehyde fixation and critical point drying had the smooth surface with wrinkled parts. Cells were spherical and measured 2-6 μm in diameter. For the contaminated culture, the photosynthetic purple bacteria are shown to stick on the surface of algal cells. The inside of each particle was revealed by using cryofracture technique. Each particle was occupied by a hole in the center, and its diameter was approximately one-half of the particle in sectional view (Fig. 3).

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