Long-Duration Soft X-Ray Pulses by XeCl Laser Driven Plasmas and Applications.

We report the characterization of a soft x-ray plasma source generated by a long-pulse XeCl excimer laser system. The output energy is 4 J at a wavelength of 308 nm in a 100-ns pulse. The intensity of radiation on target is estimated to be 4 × 1012 W cm-2.

Unfolding of E. coli ribosomes: evidence for pre-existing breaks in the large subunit.

An investigation has been made on structure modifications of E. coli ribosomes following EDTA treatment. When completely deprived of magnesium, the small subunit sediments at 16S while the large one, in the same conditions, shows two components at 17S and 21S.

Physicochemical and light scattering studies on ribosome particles.

The light scattering technique has been used to measure the molecular weight of Escherichia coli ribosomes. The 30S, 50S, and 70S components have been isolated and purified. The refractive index increment dn/dc was found to have the same value, (0.

The detection of the cellular immune response against bacteriophage phi-X174 by an adaptation of the haemolytic plaque technique.

In view of the extensive use of bacteriophage as an antigen, ϕX174 was bound to sheep erythrocytes by means of bis-diazotized-benzidine. Phagecoated erythrocytes were used for the detection, by the Jerne technique, of rabbit spleen cells producing antibodies against phage. It was shown that intravenous injection of purified ϕX174 causes the appearance of spleen cells producing specific antibodies.