Discusses the report of the National Academy of Science Committee on the Biological Effects of Ionizing Radiation, with particular reference to the possibilities for lowering maximum permissible standards for exposure to man-made radiation. The excessive use of diagnostic X-rays is considered. (AL)

A news report on the possibility of a generic problem with fuel element design in scaled-up'' nuclear power plants. Some damage has been detected in new plants. (AL)

Describes an experimental program of health care for a Navajo community, and discusses the use of personal physician care where a para-medical referral system may have been more technologically efficient. (AL)

Reviews past and present arguments for and against the Delaney Clause'' of the Federal Food, Drug, and Cosmetic Act. The clause prohibits use, in food, of any amount of any substance that has caused cancer in man or animals. (AL)

Presents a physical description of a geothermal power plant, details the chemical and thermal effluents, and evaluates the physical and ecological effects of the plant. (GS)

Describes the main features of a Ralph Nader study of the National Institute of Mental Health program of community mental health centers. (AL)

Describes the influence of the state legislature on the development of medical education facilities in Michigan, including the relationship of the schools training MD's and DO's (oesteopathic practitioners). (AL)

Discusses the reasons why basic science courses are taught in all-university departments'' and the clinical experience is provided in cooperation with community health services, rather than a clinical teaching hospital, in the programs for Doctor of Medicine and Doctor of Osteopathy. (AL)

Details are given explaining how particle size, adsorption, and respiratory deposition profiles combine to determine aerosol toxicity. (DT)

Discusses incidence of methylmercury poisoning throughout the world with increasing industrial and agricultural use of mercury compounds. Describes recent epidemic in Iraq resulting from use of wheat treated with methylmercurial fungicide. New data are presented on the toxicity of methylmercury and its metabolic fate in the human body. (JR)

Reports accusations of conflict of interest in some members of the advisory committee on lead pollution. (AL)

Summarizes the discussions concerning the choice of health-related studies to be undertaken by the Institute of Medicine, including a proposal to determine the cost of education of medical professionals. (AL)