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Development of wood-inorganic composites with enhanced properties and environmental stability
(2002)
Ultrafine particles emitted from laser printers are suspected to elicit adverse health effects. We performed 75-minute exposures to emissions of laser printing devices (LPDs) in a standardized, randomized, cross- over manner in 23 healthy subjects, 14 mild, stable asthmatics, and 15 persons reporting symptoms associated with LPD emissions. Low-level exposures (LLE) ranged at the particle background (3000 cm−3) and High-level exposures (HLE) at 100 000 cm−3. Examinations before and after exp sures included spirometry, body plethysmography, transfer factors for CO and NO (TLCO, TLNO), bronchial and alveolar NO, cytokines in serum and nasal secretions (IL-1β, IL-5, IL-6, IL-8, GM-CSF, IFNγ, TNFα), serum ECP, and IgE. Across all participants, no statistically significant changes occurred for lung mechanics and NO. There was a decrease in volume-related TLNO that was more pronounced in HLE, but the difference to LLE was not significant. ECP and IgE increased in the same way after exposures. Nasal IL-6 showed a higher increase after LLE. There was no coherent pattern regarding the responses in the participant subgroups or single sets of variables. In conclusion, the experimental acute responses to short but very high-level LPD exposures were small and did not indicate clinically relevant effects compared to low particle number concentrations.
Dr. Stefan Seeger of the German Federal Institute for Materials Research and Testing (Bundesanstalt für Materialforschung und -prüfung - BAM) tells of his successful experience using Granta's CES software to make an eco-materials knowledge resource for automotive, construction, and other industries in the Berlin region.
Geomembranes used in basal liner systems of landfills must not be damaged by the coarse gravel of the standard drainage layer. Therefore, the geomembrane must be protected against mechanical damage and strain by means of a suitable protective layer. The main requirements for this protective layer as well as the long-term durability of the mineral and geotextile components are compiled in the guideline recently released by German authorities. An overview is given on the existing types of protective layer systems with the state-of-the-art testing, the requirements and selected results of related research programs.