Areas with high fossil fuel emissions, such as cities and industrial zones, will have below - normal concentrations of heavy CO2. (sciencedaily.com)
These plastic islands range in density from solid areas to a higher than normal concentration of chemical particles held floating just below the surface. (greenplanet.com)
Golde notes that while normal concentrations of amyloid - beta in human brains can aggregate to form plaques, that doesn't happen in the lab without help. (protomag.com)