A quality assurance program in radiology provides the basis for systematic measurement of various parameters which affect the quality and production of a radiographic image. We have outlined a program which can be implemented in dental offices by dentists or auxiliary personnel without sophisticated instruments. Tests designed to establish the adequacy of specific functions are described togeth...

backgrounds and objectives:today, one of the most important environmental issues is solid waste produced in dentistry that because of the presence of hazardous, toxic and pathogen agents has special importance. in this survey, solid waste produced in hamadan dentistry laboratories and practical dentist offices is studied.materials and methods: in this descriptive study, from 24 dentistry labora...

Food caching has been linked to better performance on spatial memory tasks and enlarged hippocampal volume in both birds and mammals. Within food-caching birds, it has also been predicted that species less reliant on stored food should have inferior spatial memory and a smaller hippocampus compared to species that depend heavily on food caches. Several comparisons suggest that North American co...

THE methods hitherto employed in the study of the gross metabolism of insects have been based mainly on the changes in their content of physiologically important substances during development, and on the ability of the organism to grow on selected diets of known composition. There is a third method, extensively employed by mammalian physiologists, namely analysis of excreta; this, as Uvarov (19...