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Effect On Airborne Bacteria Of Extraneous Particulate Matter Or Air Filtration
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Book Synopsis Effect on Airborne Bacteria of Extraneous Particulate Matter Or Air Filtration by : W. B. Shreve
Download or read book Effect on Airborne Bacteria of Extraneous Particulate Matter Or Air Filtration written by W. B. Shreve and published by . This book was released on 1969 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissemination of microorganism-bearing aerosols in dental operatories has raised questions about potential risks of airborne infection. The purpose of this study was to evaluate methods of reducing microbial concentrations in such aerosols. Measurements were made of the influence of particulate matter on airborne bacteria and the effectiveness of an 800-cfm high-efficiency particulate air (HEPA) filter unit in reducing airborne bacteria. A room, approximately 700 ft3 in size, was constructed of plastic material, and was kept sealed except for an intake of dust-free, bacteria-free air. The fallout rate of Bacillus subtilis spores was determined in a dust-free environment and also in the presence of known amounts of airborne particulate matter: 3.0 to 15.0 gm of Ca3(PO4)2 powder, or 0.3- or 1.0-gm of hair spray. The fallout rate of the spores (32 percent per hour) was found to increase with the addition of either form of particulate matter, resulting in a maximum 2-fold increase with 5 gm of powder, and a 1.6-fold increase with 1 gm of spray. The HEPA filter unit was effective in reducing peak concentrations of airborne bacteria by 35 percent, and in clearing the room of all airborne spores in 8-10 minutes. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1969 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Pollution Abstracts written by and published by . This book was released on 1970 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis N.A.P.C.A. Abstract Bulletin by : United States. Environmental Protection Agency
Download or read book N.A.P.C.A. Abstract Bulletin written by United States. Environmental Protection Agency and published by . This book was released on 1970 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reduction in Number of Airborne Bacteria by Air Cleaning Devices in a Closed Space by : W. B. Shreve
Download or read book Reduction in Number of Airborne Bacteria by Air Cleaning Devices in a Closed Space written by W. B. Shreve and published by . This book was released on 1969 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A need for reducing the concentration of microorganisms in the air of dental operatories has been assumed. The purpose of this study was to evaluate the effectiveness of two methods of air cleaning in reducing the number of airborne bacteria in a closed space. Tests for clearance of Bacillus subtilis spores from static and dynamic aerosols were conducted in a 700 cu ft experimental room. The air cleaning devices were a portable electronic air cleaner with a capacity of 175 cfm (tested in combinations of one, two, and three) and a high efficiency particulate air (HEPA) filter module with a capacity of 800 cfm (tested singly and as a pair). Both devices cleaned and circulated room air only. The time required for complete clearance of spores from a static aerosol decreased as air capacity increased, from an average of 19 minutes at 175 cfm to 8 minutes at 800 cfm. With forced ventilation at 800 cfm, an average of 5 minutes was required. When a dynamic aerosol was disseminated over a 10-minute period, spore concentrations plateaued after several minutes, the level depending on the rate of air flow through the cleaning devices. Cleaning efficiency was maximum when the theoretical turnover of room air occurred once every 1 1/2 to 2 minutes. No difference was observed between the efficiency of the electronic and HEPA devices. Forced ventilation at 800 cfm produced results comparable to those of HEPA filtration at the same rate.
Book Synopsis Current Catalog by : National Library of Medicine (U.S.)
Download or read book Current Catalog written by National Library of Medicine (U.S.) and published by . This book was released on with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt: First multi-year cumulation covers six years: 1965-70.
Book Synopsis Current Catalog by : National Library of Medicine (U.S.)
Download or read book Current Catalog written by National Library of Medicine (U.S.) and published by . This book was released on 1969 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes subject section, name section, and 1968-1970, technical reports.
Book Synopsis Program and Abstracts of Papers, General Meeting by : International Association for Dental Research
Download or read book Program and Abstracts of Papers, General Meeting written by International Association for Dental Research and published by . This book was released on 1969 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NAPCA Abstract Bulletin by : United States. National Air Pollution Control Administration
Download or read book NAPCA Abstract Bulletin written by United States. National Air Pollution Control Administration and published by . This book was released on 1970 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1970 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1969 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research and Development Reports Index by :
Download or read book U.S. Government Research and Development Reports Index written by and published by . This book was released on 1969 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1969 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbiology Abstracts written by and published by . This book was released on 1971-12 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air Filtration of Microbial Particles by : Herbert M. Decker
Download or read book Air Filtration of Microbial Particles written by Herbert M. Decker and published by . This book was released on 1962 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Wayne State University. Scientific and Technical Information Center Publisher : ISBN 13 : Total Pages :164 pages Book Rating :4.:/5 (321 download)
Book Synopsis Aerosols by : Wayne State University. Scientific and Technical Information Center
Download or read book Aerosols written by Wayne State University. Scientific and Technical Information Center and published by . This book was released on 1970 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CleanRooms written by and published by . This book was released on 2008-12 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: A central resource of technology and methods for environments where the control of contamination is critical.
