Epidemiologic basis for photochemical oxidant standard.

Epidemiologic basis for photochemical oxidant standard.

The problem of photochemical oxidant pollution, 98% of which is ozone, is addressed. Ozone itself is not the cause of all adverse effects (e.g., peroxyacetyl nitrites cause eye irritation). The typical sequence in the development of oxidant pollution is an initial increase in nitrous oxide, followed by nitrogen dioxide, followed by ozone. These pollutants can be carried long distances and may h...

Epidemiologic basis for the asbestos standard.

The current standard for occupational exposure to asbestos is 2 fibers/cm3 averaged over an 8-hr day. A NIOSH/OSHA committee has recently concluded that the 2 fiber/cm3 standard is grossly inadequate to protect workers from asbestos-related disease, and that all levels of asbestos exposure studied thus far have demonstrated asbestos-related disease. The committee recommends that a 0.1 fiber/cm3...

Epidemiologic Basis for Eradication

Epidemiologic Basis (XP entier)

Airborne transmission through infectious droplet nuclei Characteristics of an infectious patient Air circulation and ventilation Reducing expulsion of infectious material from source cases Host immune response Other modes of transmission: M. bovis Evaluation of the sensitivity of the tuberculin skin test Problems with the specificity of the tuberculin skin test in veterinary medicine Standardiz...

Structural Basis of Oxidant - Mediated Barrier Dysfunction

Lum, Hazel, and Kenneth A. Roebuck. Oxidant stress and endothelial cell dysfunction. Am J Physiol Cell Physiol 280: C719–C741, 2001.—Reactive oxygen species (ROS) are generated at sites of inflammation and injury, and at low levels, ROS can function as signaling molecules participating as signaling intermediates in regulation of fundamental cell activities such as cell growth and cell adaptatio...