Controlled deposition of tantalum powder in a cast of the human airways: applications for aerosol bronchography.

A hollow latex cast of the human larynx and tracheobronchial tree extending to 2 mm diameter airways "inhaled" tantalum powder (mass median aero-dynamic diameter equals 9.2 mum, omicron-g equals 1.41) at 8 liters/min.

Transfer ribonucleic acid in KB cells infected with adenovirus type 2.

Populations of transfer ribonucleic acid (tRNA) extracted from control and type 2 adenovirus (Ad2)-infected KB cells were compared. No consistent differences in acceptor activity for 11 amino acids were observed. Comparison of methylated albumin-kieselguhr (MAK) elution profiles of arginyl-tRNA from control and infected cells revealed a minor modification in that the proportion of arginyl-tRNA eluting at high salt concentration was somewhat greater in infected cells.

Studies on the nature of dengue viruses. III. RNA synthesis in cells infected with type 2 dengue virus.

Infection of KB cells with type 2 dengue virus results in stimulation of "actinomycin D-resistant" RNA synthesis. The newly synthesized intracellular RNA produces plaques on monolayers of BHK21 cells as does RNA extracted from virus. The intracellular RNA is composed predominantly of two species with sedimentation coefficients of 45 S and 20 S.