Production of wood pellets is a relatively new and expanding industry in which the exposure profiles differ from those in other wood-processing industries like carpentries and sawmills where there are lower levels of wood dust. Sixty-eight personal exposure measurements of wood dust (inhalable and total dust) and resin acids were collected for 44 participants at four production plants located i...

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We study the role of dust-dust collisional charging in protoplanetary discs. We show that dust-dust collisional charging becomes an important process in determining the charge state of dust and gas, if there is dust enhancement and/or dust is fluffy, so that dust surface area per disc volume is locally increased. We solve the charge equilibrium equations for various disc environments and dust c...

Chronic inhalation exposure to agricultural dust promotes the development of chronic respiratory diseases among poultry workers. Poultry dust is composed of dander, chicken feed, litter bedding and microbes. However, the microbial composition and abundance has not been fully elucidated. Genomic DNA was extracted from settled dust and personal inhalable dust collected while performing litter sam...

Exposure assessment is a main component of epidemiologic studies and variability in exposure. This assessment is considered as a common approach for such phenomenon. A total of 129 dust samples were collected randomly from 197 personnel from a cement factory located in Ilam province, during 2009 in Iran. The between- and within-group components of variability were determined to assess the contr...

Allergic rhinitis (AR) is a common, frequently occurring disease with increasing incidences every year. House dust mite is one of the common indoor allergens that causes allergic rhinitis. So this study was aimed to evaluate the efficacy and safety of Allergopharma house dust mite vaccine in the treatment of allergic rhinitis. A case self-control method was used to compare the total symptom usi...

BACKGROUND Several studies have reported associations between cement dust exposure and adverse respiratory health effects, but there are few follow-up studies and no studies of respiratory health effects following dust control measures. AIMS To assess changes in respiratory health among cement workers and unexposed controls after 1 year in a factory implementing a health and safety campaign w...

We present a study of the relationship between the surface brightness of the radio continuum emission and the FIR emission within M 31, based on radio maps at four wavelengths (73 cm, 20 cm, 11 cm and 6 cm) and the HIRES-FIR maps at 60 μm and 100 μm. For a common resolution of 5′ we decomposed the radio emission into a thermal and a nonthermal radio continuum map at λ20 cm, and the FIR emission...

The research presented in this article assessed geochemical factors relating to dust produced during primary lead smelting. Bulk dust samples and size-selective airborne dust samples were collected from four areas of a primary lead smelter and analyzed by X-ray diffraction and sequential chemical extraction. X-ray diffraction showed that the smelter dusts were composed primarily of sulfides, ox...

OBJECTIVE The objective of this study was to assess respiratory outcomes and environmental exposure levels of workers in cage-housed and floor-housed poultry operations. METHODS Poultry operations were evaluated for total dust, endotoxin, and ammonia, and respiratory symptoms and lung function tests of workers were conducted. RESULTS Workers in floor-housed poultry operations had significan...