SEVERAL methods 1–6 have been published for the quantitative estimation of amino-acids after separation by filter-paper chromatography. In general, these methods have only been applied to simple amino ...

IN order to obtain a good separation in filter paper chromatography, the size of the spot of liquid applied to the paper must be small, which often necessitates repeated, time-consuming applications ...

Science, founded by Thomas A. Edison in 1880 and published by AAAS, today ranks as the world's largest circulation general science journal. Published 51 times a year, Science is renowned for its ...

Vermont is known for beautiful fall colors. Every Autumn, the green leaves change into a wonderful collage of oranges, yellows, and reds. It may seem like the colors just appear out of nowhere, but ...