A novel hopanoid, 30-(5'-adenosyl)hopane, from the purple non-sulphur bacterium Rhodopseudomonas acidophila, with possible DNA interactions.

Factors influencing the production of hydrogen by the purple non‐sulphur phototrophic bacterium Rhodopseudomonas acidophila KU001

Rhodopseudomonas acidophila KU001 was isolated from leather industry effluents and the effect of different cultural conditions on hydrogen production was studied. Anaerobic light induced more hydrogen production than anaerobic dark conditions. Growing cells produced more amounts of hydrogen between 96 and 144 h of incubation. Resting and growing cells preferred a pH of 6.0 ± 0.24 for hydrogen p...

The structure and function of the LH2 (B800-850) complex from the purple photosynthetic bacterium Rhodopseudomonas acidophila strain 10050.

Fluorescence spectral fluctuations of single LH2 complexes from Rhodopseudomonas acidophila strain 10050.

We have investigated the energy landscape of the bacterial photosynthetic peripheral light-harvesting complex LH2 of purple bacterium Rhodopseudomonas acidophila by monitoring sequences of fluorescence spectra of single LH2 assemblies, at room temperature, with different excitation intensities as well as at elevated temperatures, utilizing a confocal microscope. The fluorescence peak wavelength...

Spectroscopy of individual light-harvesting 2 complexes of Rhodopseudomonas acidophila: diagonal disorder, intercomplex heterogeneity, spectral diffusion, and energy transfer in the B800 band.

This paper reports a detailed spectroscopic study of the B800 absorption band of individual light-harvesting 2 (LH2) complexes of the photosynthetic purple bacterium Rhodopseudomonas acidophila at 1. 2 K. By applying single-molecule detection techniques to this system, details and properties can be revealed that remain obscured in conventional ensemble experiments. For instance, from fluorescen...

Electronic Excitation Transfer from Carotenoid to Bacteriochlorophyll in the Purple Bacterium <italic>Rhodopseudomonas acidophila</italic>

Ultrafast fluorescence upconversion has been used to probe electronic excitation transfer within the B800B820 light-harvesting antenna of Rhodopseudomonas acidophila strain 7050. Emission from the carotenoid S2 band decays in 54 ( 8 fs, and the bacteriochlorophyll B820 Qy band rises in approximately 110 fs. The B820 Qy rise time is wavelength-dependent. Energy-transfer rates between the caroten...