Dilution had significant effect on the lean flammability limits, increasing from a lean limit of ϕ = 0.35 at air levels of dilution to ϕ = 0.65 at inert:O2 dilution of 7.5.
Results show that stoichiometric breakthrough times, the adsorption rate constants (in Wheeler Jonas equation) and product constants (in Yoon Nelson equation) do not strongly depend on concentration, demonstrating some indicators for simulating the experiments at indoor air level conditions.
We have demonstrated a vital role of flavodiiron proteins, particularly Flv2 and Flv4, for oxygenic photosynthesis of Synechocystis cells at ambient air levels of CO2.
Notably, NAA/tCr changes as a function of cumulative Mn exposure are observable at Mn air levels below the ACGIH limit, consistent with early presymptomatic neuronal dysfunction.
Only one study (Ye et al. 2005) consisted of a group (waitresses) with low mean and low peak exposures at indoor air levels.
We conducted a pooled analysis to investigate the relationship between exposure to elemental mercury in air and resulting urinary mercury levels, specifically at lower air levels relevant for environmental exposures and public health goals (i.e., < 50 microg/m3 down to 1.0 microg/m3).
The lack of sensitivity of asthmatics at these lower air levels in controlled chamber studies is consistent with expected patterns of absorption in the upper airways.
A recent multicity time-series analysis in Hong Kong, Shanghai, and Wuhan provided further evidence of short-term risks (Wong et al. 2008), with significant health effects detected at air pollution levels below minimum air quality standards in China.
This study suggests an exposure-response relationship between TSP and SO2 and hospital outpatient visits, both at high air pollution levels and at levels well below air quality standards recommended by the World Health Organization.
This paper presents an experimental design methodology for the optimization of the photocatalytic removal of 2-propanol also called isopropyl alcohol (IPA) at indoor air concentration level (ppbv).
