نتایج جستجو برای: hepa filter test

تعداد نتایج: 926039  

2015
Birgitta Nordgren Cecilia Fridén Ingrid Demmelmaier Gunnar Bergström Ingrid E. Lundberg Alyssa B. Dufour Christina H. Opava

OBJECTIVES The aims of this study were to document adherence to and changes in health-enhancing physical activity (HEPA) levels and self-reported and assessed functioning and to explore aspects of adherence and response during the first year of an outsourced 2-year HEPA programme in people with RA. METHODS Two-hundred and twenty patients participated in this observational cohort study, which ...

Journal: :Planta medica 2008
Tai-Hung Chen Bing-Chung Liau Sheng-Yang Wang Ting-Ting Jong

In this study, we assessed the antitumor activity of the methanol extract from wood chips of the heartwood of the Taiwan red cypress, Chamaecyparis formosensis Matsumura, which is a precious tree species endemic to Taiwan. A brine shrimp lethality test (BST) indicated that the ethyl acetate (EtOAc)-soluble extract from the MeOH extract was a suitable candidate (LC (50) = 15.36 microg/mL) for fu...

2002
K White S Smith P Dingle

Carpeted bedrooms of 36 asthmatic children were monitored to examine the mass concentration of indoor aerosol particulate matter (PM), from non-smoking households, and the effect high efficiency particle arresting (HEPA) air filtration had on PM concentration. Concurrent indoor and outdoor monitoring was also undertaken. Mass concentration was determined gravimetrically using time weighted conc...

Journal: :International journal of engineering technology and management sciences 2023

In 2021, air pollution has gone beyond all limits. According to the WHO, 7 million people die annually as a result of pollution. A whopping 91 percent world's population is now exposed due its wide distribution. This also implies that within your home contaminated. order address this problem, we have developed small purifier employs water an filter rather than pricey filters. Additionally, it f...

Journal: :The Annals of occupational hygiene 1998
A E Johnson R C Brown

A number of commercially available air cleaners designed for use against solder fume have been examined. The fume capture efficiencies have been measured with a tracer gas comprising a neutrally buoyant mixture of sulphur hexafluoride and helium, and the filtration efficiencies have been measured using solder fume produced at a constant concentration, laboratory-generated monodisperse aerosols,...

Journal: :The Southeast Asian journal of tropical medicine and public health 2009
Kaewjai Malaithao Thareerat Kalambaheti Suwalee Worakhunpiset Pongrama Ramasoota

This study compared the filtrating efficiency (FE) of a commercial electronic air filter for filtering bacteria and viruses from contaminated air with a high efficiency particulate air (HEPA) filter. An enclosed chamber was constructed, in the middle of which an air filter was placed for testing. MTB H37Ra and T7 virus at concentrations of 5x10(8) each were sprayed into one side of the chamber ...

Journal: :Journal of bacteriology 2005
Guocun Huang Qing Fan Sigal Lechno-Yossef Elizabeth Wojciuch C Peter Wolk Takakazu Kaneko Satoshi Tabata

As demonstrated with alr2835 (hepA) and alr2834 (hepC) mutants, heterocysts of Anabaena sp. strain PCC 7120, a filamentous cyanobacterium, must have an envelope polysaccharide layer (the Hep+ phenotype) to fix dinitrogen in an oxygen-containing milieu (the Fox+ phenotype). Transpositions presumptively responsible for a Fox- phenotype were localized in open reading frames (ORFs) near hepA and he...

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