At the end of the column they elute one at a time. During the entire chromatography process the eluent is collected in a series of fractions. Fractions can be collected automatically by means of fraction collectors. The productivity of chromatography can be increased by running several columns at a time.
dash - the act of moving with great haste; he made a dash for the door bolt rush, rushing, haste, hurry - the act of moving hurriedly and in a careless manner; in his haste to leave he forgot his book
underlie (third-person singular simple present underlies, present participle underlying, simple past underlay, past participle underlain) (intransitive) To lie in a position directly beneath. A stratum of clay underlies the surface gravel. To lie under or beneath. To serve as a basis of; form the foundation of.