billboard global 200 the week's most popular songs based on streaming and sales activity from over 200 territories around the world — including the united states — as tracked by luminate. the ...

The solution was mixed for 1 min and then kept in the dark. After 1 h, a spectrophotometric measure was made at a wavelength of 765 nm (Bausch & Lomb, SPECTRONIC 21). Standard gallic acid (GA) was ...