Ascomycota of their hosts. Owing to their long evolutionary history, the Ascomycota have evolved the capacity to break down almost every organic substance. Unlike most organisms, they are able to use their own enzymes to digest plant biopolymers such as cellulose or lignin. Collagen, an abundant structural protein in animals, and keratin—a protein that forms hair and nails—, can also serve as food sources. Unusual examples include "Aureobasidium pullulans", which feeds on wall paint, and the kerosene fungus "Amorphotheca resinae", which feeds on aircraft fuel (causing occasional problems for the airline industry), and may sometimes block fuel pipes. Other species can
Hair gel punk subculture in the 1980s. Some hair gels include temporary hair coloring, which includes variants in unnatural colors associated with various subcultures, such as the goths, ravers, and greasers. In films and on television, mobsters and government agents are also well-known for using hair gel in similar ways to each other, goths, and greasers. Cationic polymers are among the main functional components of hair gel. The positive charges in the polymers causes them to stretch, making the gel more viscous. Hair gels resist natural protein conformations and allow hair to be styled and textured, because the stretched-out polymer takes up