A SERIES of fluorescent pteridines may be revealed and separated by paper chromatography (Hadorn & Mitchell, 1951) from various organs of Drosophila in which they appear in high concentrations. Striking differences in the quantities and in the developmental patterns of these compounds are produced by a variety of gene mutations. While the chemical analysis of the fluorescent substances is rapid...

A vertex coloring of a graph , is an assigments colors to the vertices such that no two adjacent are assigned same color. The least number needed for chromatic number, denoted by . said be planar if it can drawn in plane so edges crossing except at endpoints. dual constructed from graph. Each region represented Two connected these neugbours and have common border. diamond used model structure n...