Using tissue culture methods, mycoplasmas (PPLO) were isolated from synovial fluid, bone marrow, kidney, or serum of 14 of 17 patients with either rheumatoid arthritis, systemic lupus erythematosus, or Reiter's syndrome. Sensitivity to various antibiotics and the ability to ferment glucose varied, but all strains were sensitive to tetracycline, and hemolysed sheep cells. Antigenic relationships...

The circadian clock in all organisms is so intimately linked to light reception that it appears as if evolution has simply wired a timer into the mechanism that processes photic information. Several recent studies have provided new insights into the role of light input pathways in the circadian system of Arabidopsis.

The influence of environmental factors (mainly the river flow) on the year-to-year variability of European eel Anguilla anguilla fluvial recruitment in a small coastal catchment, the Frémur River (north-west France) was examined. A comprehensive survey of catches from fixed traps at two weirs located at 4.5 km (Pont es Omnes Dam) and 6.0 km (Bois Joli Dam) above the river mouth was carried out ...

The authors report on the excitation dynamics of the photoluminescence PL emission of Er doped GaN thin films synthesized by metal organic chemical vapor deposition. Using the frequency tripled output from a Ti:sapphire laser, the authors obtained PL spectra covering the ultraviolet UV to the infrared regions. In the UV, a dominant band edge emission at 3.23 eV was observed at room temperature;...