In India, bricks as building materials are mainly prepared by clay using the deposited sediments of rivers, and the radionuclide contents in bricks and brick-making clays should vary with origin and geological condition. Primordial radionuclides in building materials are one of the sources of radiation hazard in dwellings made of these materials. It is important to measure the natural radioacti...

1. A method for measuring the pulmonary water compartments in vivo in anaesthetized dogs is described. 2. The technique depends upon the sequential intravenous injection of markers labelled with gamma-ray-emitting isotopes. Each is allowed to become evenly distributed throughout the compartment to which it is confined. A calibrated gamma-counter placed at the surface of the inflated lung then r...

Factors controlling the last stages of clathrin-coated vesicle formation were investigated using an assay allowing direct measurement of the detachment of these vesicles from the plasma membrane. Plasma membranes from cultured cells surface-labelled with 125I-alpha2-macroglobulin (a ligand that preferentially associates with clathrin-coated pits) were isolated by sonication of cells attached to...