Existing-home sales fell to a rate of 3.84 million in September, the National Association of Realtors said.

ConspectusPhotovoltaics (PVs) are currently the most economical and location-independent source of electricity generation, and their demand is growing rapidly as a sustainable renewable energy source.

Small molecules are low molecular weight molecules that include lipids, monosaccharides, second messengers, other natural products and metabolites, as well as drugs and other xenobiotics. They are ...