Call number: LD2668 .T4 1978 S693 / Master of Science

No description available.

Thesis (M. Med. Sc.)--University of Hong Kong, 2004. / Also available in print.

No description available.

Thesis (Ph. D.)--University of Texas at Austin, 1998. / Vita. Includes bibliographical references (leaves 271-296). Available also in a digital version from Dissertation Abstracts.

No description available.

Thesis (Ph.D. - Microbiology and Immunology)--University of Arizona. / Includes bibliographical references (leaves 132-134).

Thesis (Ph.D.)--Virginia Commonwealth University, 2008. / Title from title-page of electronic thesis. Prepared for: Dept. of Mechanical Engineering. Bibliography: leaves 212-233.

Thesis (Ph. D.)--Virginia Commonwealth University, 2008. / Prepared for: Dept. of Mechanical Engineering. Includes bibliographical references (leaves 212-233). Also available online via the Internet.

Three experiments were conducted to characterize the concentration of microorganisms in biosolids, the plume of aerosols created during land application of biosolids and the occupational risk of infection due to pathogens aerosolized during land application of biosolids in the United States. In all, more than three-hundred air samples were collected immediately downwind of biosolids applications throughout the United States using liquid impingers, and more than one-hundred air samples were collected downwind of microbially seeded, land applied water, which served as a conservative model system of aerosol generation. The novel model system made it possible to calculate the flux of microorganisms through a virtual plane defined by air samplers in vertical and horizontal arrays, located immediately downwind of a passing spray applicator. The rate of aerosolization during land application of biosolids near Tucson, Arizona, was calculated to be less than 33 plaque forming units (PFU) of coliphage and 10 colony forming units (CFU) of coliform bacteria per meter traveled by the spray applicator. Rates of aerosolization from the model system were shown to be much greater. To assess the risk to occupational health from bioaerosols generated during land application of biosolids, coliform bacteria, coliphages, and heterotrophic plate count (HPC) bacteria were enumerated from air and biosolids at 10 land application sites throughout the nation. The method of land application strongly influenced aerosolization, while relative humidity, temperature and wind speed showed limited correlation to concentrations of fecal indicator microorganisms in air. Occupational risks of infection and illness from aerosolized Salmonella and enteroviruses were calculated for a variety of land application scenarios. Realistic exposure scenarios carried occupational risks of Salmonella infection ranging from of 0.0001% to 0.013% per year. The corresponding occupational risk of infection from enteroviruses, using coxsackievirus A-21 as a model, ranged from 0.78% to 2.1% per year, depending on the type of activity performed by the worker. In addition, samples of biosolids from the Southwestern United States were characterized to provide up-to-date information about pathogens in biosolids for environmental regulators, biosolids producers, researchers, and public health agencies.