Thorium Concentrations in the Environment: A Review of the Global Data

Biology Bulletin - A review of the world data on the concentrations of thorium activity concentrations in soils, the atmosphere, surface waters, and bottom sediments is presented. It is shown that...     

Chromatographic fractionation of scraping components of frog olfactory tissues. Preparation of fractions capable of sensitizing artificial lipid membrane to odorants]

The fractionation of frog olfactory preparation by ion-exchange chromatography and gel filtration permitted to obtain fractions capable of making artificial lipid membranes sensitive to odorants, such as camphora, musc ambrette and linalool. The sensitizing agent present in active fractions is a high-molecular-weight (m.w. 100,000) protein containing substance. It is suggested that this agent is a component of a special transport system which may carry the odorous molecules to olfactory receptor cells or to remove them from olfactory tissues.