BACKGROUND Population exposure assessment methods that capture local-scale pollutant variability are needed for large-scale epidemiological studies and surveillance, policy, and regulatory purposes. Currently, such exposure methods are limited. METHODS We created 2006 national pollutant models for fine particulate matter [PM with aerodynamic diameter ≤ 2.5 μm (PM2.5)], nitrogen dioxide (NO2),...

The two 2-hydroxy-6-oxohepta-2,4-dienoate (HOHD) hydrolase genes, etbD1 and etbD2, were cloned from a strong polychlorinated biphenyl (PCB) degrader, Rhodococcus sp. strain RHA1, and their nucleotide sequences were determined. The etbD2 gene was located in the vicinity of bphA gene homologs and encoded an enzyme whose amino-terminal sequence was very similar to the amino-terminal sequence of th...

The temperature of zeolite samples containing various adsorbed molecules was rapidly changed (within 15 s) from room temperature to 600 K by means of a laser beam. The location of the sealed glass ampoule in a boron nitride container decreases the temperature gradient in the sample and avoids laser-induced reactions. The technique facilitates time-dependent magic-angle-spinning (MAS) NMR spectr...