Among African-American and Dominican newborns in a New York City birth cohort, we found that prenatal exposure to PAHs
measured using a personal air monitor during the third trimester of pregnancy was associated with lower global methylation levels measured in umbilical cord WBC DNA.
Because of their hydrophobicity, PAHs
tend to bind to sediments in aquatic systems.
One had believed beyond the shadow of a doubt that PAHs
were formed around stars, but no direct measurements were made of them," he said.
Our results suggest that PAHs
might indeed have played a role in causing IUGR in these women.
However, he notes, scientists searching for extraterrestrial life haven't been interested in most PAHs
because the molecules aren't known to play important roles in organisms on Earth.
Stepanov said that until recently, scientists believed that only trace amounts of PAH
existed in snuff because the tobacco was not burned when used.
Determining the phenotypic impact of embryonic exposure to individual environmentally relevant PAHs
, complex mixtures, and environmentally transformed PAHs
and define the role of AHRs in the response
seem to be limited to grilling or barbecuing, another group of risky chemicals, heterocyclic amines (HAs), occurs more frequently in broiled and pan-fried meats.
At outdoor points, the most common sources of PAHs
was both from petrol and diesel combusted vehicles, and diesel fumes from generator sets," the study by S.
The airborne emissions of PAHs
(2003) have been shown to be comparable to PAHs
concentrations in the urban air, and the dioxine emissions (2007) have been close to the detection limit, 4 pg/[m.
To test the idea that PAHs
were responsible, we measured and computed PAH
spectra under astronomical conditions, creating the world's largest collection of PAH
We analyzed 12 PAHs
in repeated residential-dust samples collected at intervals of 3-8 years.