Under dark, anaerobic conditions in the presence of sufficient nickel, Rhodospirillum rubrum grows with a doubling time of under 5 h by coupling the oxidation of CO to the reduction of H+ to H2. CO-dependent growth of R. rubrum UR294, bearing a kanamycin resistance cassette in cooC, depends on a medium nickel level ninefold higher than that required for optimal growth of coo+ strains.

An original 1-acetato-4-(1-pyrenyl)-1,4,7-triazacyclononane (AcPyTACN) was synthesized for the immobilization of a His-tagged recombinant CODH from Rhodospirillum rubrum (RrCODH) on carbon-nanotube electrodes. The strong binding enzyme at Ni-AcPyTACN complex affords high current density 4.9 mA cm−2 towards electroenzymatic CO2 reduction and stability more than 6×106 TON when integrated gas-diff...

The ethanol extract of leaves and shoot portion of the fresh Eichhornia crassipes were screened for the presence of various phytochemicals by standard procedures. The present study indicates that the fresh plant contain alkaloids, flavonoids, phenols, sterols, terpenoids, anthoquinones and protein. The aqueous, chloroform fractionates and the ethanol and ethyl acetate extracts were screened for...

The analysis of three pulse echo peak shift (3PEPS) data for LHI of Rhodobacter sphaeroides is discussed in comparison with that of the B820 subunit of Rhodospirillum rubrum. We report also ab initio molecular orbital (CIS/6-3IG*) calculations of electronic couplings for supermolecule subunits of the light harvesting 2 complex (LH2) of Rhodopseudomonas acidophila.

Rhodospirillum centenum is a purple photosynthetic bacterium that is capable of differentiating from vibrioid swimming cells that contain a single polar flagellum into rod-shaped swarming cells that have a polar flagellum plus numerous lateral flagella. Microscopic studies have demonstrated that the polar flagellum is constitutively present and that the lateral flagella are found only when the ...

Cells from serial cultures of R. rubrum, grown anaerobically in the light, were harvested at intervals from (1/2) to 15 days and sectioned for electron microscopy by conventional methods. Cells of this species possess a multilayered outer envelope, and the external cell surface is differentiated into ridges extending parallel or obliquely to the long axis of the cell. Cells from very young cult...

Homoserine dehydrogenase catalyzes the reductive conversion of aspartate P-semialdehyde to homoserine (l), which has been identified in several microorganisms as a precursor of three other amino acids. On the one hand, homoserine is converted to methionine, and through a separate sequence of reactions is transformed to threonine, a precursor of isoleucine (2). Recent studies (3-7) have provided...