Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Air Filtration Of Microbial Particles full books in PDF, epub, and Kindle. Read online Air Filtration Of Microbial Particles ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Herbert M. Decker
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (31 download)
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 : Herbert M. Decker
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (227 download)
Download or read book Air Filtration of Microbial Particles written by Herbert M. Decker and published by . This book was released on 1961 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air filtration as a means of removing bacteria is reviewed to provide architects, engineers, hospital administrators, and research investigators with the benefit of information and experience gained. Various types of filters have been evaluated, using bacterial organisms aerosolized in particles with diameters of one to five microns as the test simulant. Based on results of these tests, filters have been placed into four categories: roughing (10 to 60% efficient), medium (60 to 90% efficient), high (90 to 99% efficient), and absolute (99.99+% efficient). Other methods of air purification, such as electrostatic precipitation, air washing, ultraviolet light, and incineration are mentioned briefly. Information is provided on filter evaluation methods, with most of the emphasis on biological techniques. Sections are included on factors to be considered in selecting filters for removal of bacterial particles and on installing and decontaminating filters.
Author : Institute of Medicine
Publisher : National Academies Press
ISBN 13 : 0309182158
Total Pages : 376 pages
Book Rating : 4.3/5 (91 download)
Download or read book Learning from SARS written by Institute of Medicine and published by National Academies Press. This book was released on 2004-04-26 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emergence of severe acute respiratory syndrome (SARS) in late 2002 and 2003 challenged the global public health community to confront a novel epidemic that spread rapidly from its origins in southern China until it had reached more than 25 other countries within a matter of months. In addition to the number of patients infected with the SARS virus, the disease had profound economic and political repercussions in many of the affected regions. Recent reports of isolated new SARS cases and a fear that the disease could reemerge and spread have put public health officials on high alert for any indications of possible new outbreaks. This report examines the response to SARS by public health systems in individual countries, the biology of the SARS coronavirus and related coronaviruses in animals, the economic and political fallout of the SARS epidemic, quarantine law and other public health measures that apply to combating infectious diseases, and the role of international organizations and scientific cooperation in halting the spread of SARS. The report provides an illuminating survey of findings from the epidemic, along with an assessment of what might be needed in order to contain any future outbreaks of SARS or other emerging infections.
Author : United States. Public Health Service
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (299 download)
Download or read book Air Filtration of Microbial Particles written by United States. Public Health Service and published by . This book was released on 1968 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Air Filtration of Microbial Particles [by] Herbert M. Decker [and Others] A Joint Publication of the Dept. of the Army, U.S. Army Chemical Corps, Fort Detrick, Frederick, Md. and the U.S. Dept. of Health, Education, and Welfare, Public Health Service, Communicable Disease Center, Atlanta, Ga PDF Online Free](https://books.google.com/books/content/images/frontcover/aqEqtAEACAAJ?fife=w200-h370)
Author : Herbert M. Decker
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (976 download)
Download or read book Air Filtration of Microbial Particles [by] Herbert M. Decker [and Others] A Joint Publication of the Dept. of the Army, U.S. Army Chemical Corps, Fort Detrick, Frederick, Md. and the U.S. Dept. of Health, Education, and Welfare, Public Health Service, Communicable Disease Center, Atlanta, Ga written by Herbert M. Decker and published by . This book was released on 1962 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. B. Shreve
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (227 download)
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).
Author : Dominique Thomas
Publisher : Elsevier
ISBN 13 : 008102116X
Total Pages : 228 pages
Book Rating : 4.0/5 (81 download)
Download or read book Aerosol Filtration written by Dominique Thomas and published by Elsevier. This book was released on 2016-11-30 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filtration of aerosols is omnipresent in our daily lives, in areas as diverse as health, the protection of people and the environment, and air treatment inside buildings. However, the collection of particles within a filter media is not, contrary to popular belief, linked to a simple screen effect. The phenomena involved are much more complex and require the consideration of aerosol interactions, filter media and process conditions to select the best fiber filter for a given application. Aerosol Filtration, book for students, hygiene or process engineers, fibrous media manufacturers, designers, and filtration system suppliers or users addresses the filtration of aerosols in six chapters. These chapters cover physics and aerosol characterization, the fibrous media, and efficiency and filter clogging by solid or liquid aerosols, with special attention to the filtration of the nanoparticles. - Analyses the behavior of fibrous media against solid and liquid aerosols - Presents models of efficiency and pressure drop - Introduces computing elements for estimating the lifetime of filters - Provides guidance for designing filters and predicting their behavior over time
Author : G. B. Pelleu Jr
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (227 download)
Download or read book Reduction of Microbial Concentration in Air of Dental Operating Rooms by Hepa Filtration written by G. B. Pelleu Jr and published by . This book was released on 1969 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbial aerosols are known to be created and disseminated in dental operating rooms (DOR's) in quantities sufficient to raise the possibility of cross infection. The purpose of this study was to evaluate the effectiveness of high efficiency particulate air (HEPA) filters in reducing the concentration of air-borne microorganisms. Test were made in DOR's of 1600-, 1800-, and 3240-cu ft capacity with an 800-cfm HEPA filter unit. Concentrations of microorganisms were measured 4 times daily at approximately 2- to 3-hour intervals. Samples were taken in each DOR with 1-hour Reyniers air samplers drawing 1 cfm for 2 weeks without air filtration and then for 2 weeks with air filtration. In a DOR used for routine scaling with an ultrasonic instrument, the mean microbial air count of 21 viable particles (VP)/cu ft without air filtration was reduced 90 percent when the air was filtered. In this DOR, peak recoveries of 185 VP/cu ft without air filtration were reduced 84 percent when the air was filtered. Bacteria recovered during peak periods were predominantly alpha-hemolytic streptococci of the viridans group. In two DOR's used only for routine operative dentistry, microbial air counts were lower, with mean values of 3-8 VP/cu ft and peak values of 8-26 VP/cu ft without air filtration. These concentrations were reduced 65 percent when the air was filtered. It was concluded that under normal working conditions an 800-cfm HEPA filter unit is effective in reducing the concentration of airborne microorganisms in a DOR by about 70 percent.
Author : Zhonglin Xu
Publisher : Springer Science & Business Media
ISBN 13 : 3642393748
Total Pages : 871 pages
Book Rating : 4.6/5 (423 download)
Download or read book Fundamentals of Air Cleaning Technology and Its Application in Cleanrooms written by Zhonglin Xu and published by Springer Science & Business Media. This book was released on 2013-10-10 with total page 871 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Air Cleaning Technology and Its Application in Cleanrooms sets up the theoretical framework for cleanrooms. New ideas and methods are presented, which include the characteristic index of cleanrooms, uniform and non-uniform distribution characteristics, the minimum sampling volume, a new concept of outdoor air conditioning and the fundamentals of leakage-preventing layers. Written by an author who can look back on major scientific achievements and 50 years of experience in this field, this book offers a concise and accessible introduction to the fundamentals of air cleaning technology and its application. The work is intended for researchers, college teachers, graduates, designers, technicians and corporate R&D personnel in the field of HVAC and air cleaning technology. Zhonglin Xu is a senior research fellow at China Academy of Building Research.
Author : W. B. Shreve
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.E/5 ( download)
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.
Author : Amira A-Abdalall
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Impact of Air-Conditioning Filters on Microbial Growth and Indoor Air Pollution written by Amira A-Abdalall and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contemporary lifestyles dictate that people spend between 60 and 90% of their daily lives indoors. For those living in warm climates, air conditioning is thus considered a necessity. Air conditioners function by removing hot and humid air from building interior and replacing it with cooler air. Microorganisms are considered among the most important sources of poor quality of indoor air, and contamination of this air by microbial pollutants is being increasingly recognized as a public health problem and a probable cause of the so-called sick building syndrome. In this regard, microfiber glass panel filters are considered to provide an effective solution for air filtration and have been demonstrated to improve air quality in many applications. However, recent research has demonstrated that certain microorganisms are able to colonize panel filter surfaces. Studies on selected microbes isolated from the most commonly used filters have revealed that the bacterial and fungal moist masses carried on sponge-type filters are greater than those carried on polyester and high-efficiency particulate air (HEPA) filters. Moreover, microbial moist mass has been found to increase with increasing incubation time. In addition, recent research has shown that certain microorganisms, particularly fungi, can colonize the materials used in heating, ventilation, and air-conditioning systems (HVAC).
Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309449839
Total Pages : 318 pages
Book Rating : 4.3/5 (94 download)
Download or read book Microbiomes of the Built Environment written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-10-06 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: People's desire to understand the environments in which they live is a natural one. People spend most of their time in spaces and structures designed, built, and managed by humans, and it is estimated that people in developed countries now spend 90 percent of their lives indoors. As people move from homes to workplaces, traveling in cars and on transit systems, microorganisms are continually with and around them. The human-associated microbes that are shed, along with the human behaviors that affect their transport and removal, make significant contributions to the diversity of the indoor microbiome. The characteristics of "healthy" indoor environments cannot yet be defined, nor do microbial, clinical, and building researchers yet understand how to modify features of indoor environmentsâ€"such as building ventilation systems and the chemistry of building materialsâ€"in ways that would have predictable impacts on microbial communities to promote health and prevent disease. The factors that affect the environments within buildings, the ways in which building characteristics influence the composition and function of indoor microbial communities, and the ways in which these microbial communities relate to human health and well-being are extraordinarily complex and can be explored only as a dynamic, interconnected ecosystem by engaging the fields of microbial biology and ecology, chemistry, building science, and human physiology. This report reviews what is known about the intersection of these disciplines, and how new tools may facilitate advances in understanding the ecosystem of built environments, indoor microbiomes, and effects on human health and well-being. It offers a research agenda to generate the information needed so that stakeholders with an interest in understanding the impacts of built environments will be able to make more informed decisions.
Author : R.C. Brown
Publisher : Pergamon
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.3/5 (91 download)
Download or read book Air Filtration written by R.C. Brown and published by Pergamon. This book was released on 1993-11-02 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for clean air has probably never been greater. Many industrial employees need to avoid exposure to airborne particulates, while certain industrial processes demand clean air of exceptional quality. Medical and biological fields rely on sterile air, while filtration can improve air quality in offices, homes and all types of transport. Filters act in a variety of complex and subtle ways. Each chapter introduces its subject matter simply, before tackling the problem in greater depth. The book therefore provides an excellent basis for detailed study, but is also invaluable to anyone needing an overview of the subject.
Author : Charles Norman Davies
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.3/5 (91 download)
Download or read book Air Filtration written by Charles Norman Davies and published by . This book was released on 1973 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ruquan Ye
Publisher :
ISBN 13 : 9789814877275
Total Pages : 88 pages
Book Rating : 4.8/5 (772 download)
Download or read book Laser-induced Graphene written by Ruquan Ye and published by . This book was released on 2020-11-30 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: LIG is a revolutionary technique that uses a common CO2 infrared laser scriber, like the one used in any machine shop, for the direct conversion of polymers into porous graphene under ambient conditions. This technique combines the preparation and patterning of 3D graphene in a single step, without the use of wet chemicals. The ease in the structural engineering and excellent mechanical properties of the 3D graphene obtained have made LIG a versatile technique for applications across many fields. This book compiles cutting-edge research on LIG by different research groups all over the world. It discusses the strategies that have been developed to synthesize and engineer graphene, including controlling its properties such as porosity, composition, and surface characteristics. The authors are pioneers in the discovery and development of LIG and the book will appeal to anyone involved in nanotechnology, chemistry, environmental sciences, and device development, especially those with an interest in the synthesis and applications of graphene-based materials.
Author : Tatiana Morosuk
Publisher : BoD – Books on Demand
ISBN 13 : 1838806660
Total Pages : 278 pages
Book Rating : 4.8/5 (388 download)
Download or read book Low-temperature Technologies written by Tatiana Morosuk and published by BoD – Books on Demand. This book was released on 2020-06-10 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-temperature technologies include the area of refrigeration and cryogenics. Since the beginning of theoretical developments and practical application, these technologies become a part of our life. Low temperatures have found application in almost all branches of industries as well as in households. These systems can be of very small capacity (few watts) up to hundreds of megawatts. In order to develop any of the technologies for successful practical application, very intensive theoretical and experimental research should be conducted. This book provides the reader with a comprehensive overview of the latest developments, perspectives, and feasibility of new low-temperature technologies and improvements of existing systems, equipment, and evaluation methods.
Author : Xiaoyuan Wang
Publisher : Springer Science & Business Media
ISBN 13 : 9048190789
Total Pages : 419 pages
Book Rating : 4.0/5 (481 download)
Download or read book Endotoxins: Structure, Function and Recognition written by Xiaoyuan Wang and published by Springer Science & Business Media. This book was released on 2010-06-30 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Endotoxins are potentially toxic compounds produced by Gram-negative bacteria including some pathogens. Unlike exotoxins, which are secreted in soluble form by live bacteria, endotoxins are comprised of structural components of bacteria. Endotoxins can cause a whole-body inflammatory state, sepsis, leading to low blood pressure, multiple organ dysfunction syndrome and death. This book brings together contributions from researchers in the forefront of these subjects. It is divided into two sections. The first deals with how endotoxins are synthesized and end up on the bacterial surface. The second discussed how endotoxins activate TLR4 and, in turn, how TLR4 generates the molecular signals leading to infectious and inflammatory diseases. The way endotoxins interact with the host cells is fundamental to understanding the mechanism of sepsis, and recent research on these aspects of endotoxins has served to illuminate previously undescribed functions of the innate immune system. This volume presents a description of endotoxins according to their genetic constitution, structure, function and mode of interaction with host cells.
