Epoxy resin may be reacted with itself in the presence of an anionic catalyst (a Lewis base such as tertiary amines or imidazoles) or a cationic catalyst (a Lewis acid such as a boron trifluoride complex) to form a cured network. This process is known as catalytic homopolymerisation.
A gorilla's lifespan is normally between 35 and 40 years, although zoo gorillas may live for 50 years or more. Colo, a female western gorilla at the Columbus Zoo and Aquarium was the oldest known gorilla, at 60 years of age when she died on January 17, 2017.
Because of their great geographical separation, about 750 km (466 mi), western and eastern gorillas live in dramatically different habitats (Tutin & Vedder 2001). Even within-species habitat variation is quite great, from swamp to montane forest. Eastern gorillas live in submontane and montane forests from 650 to 4000 m (2132 to 13,123 ft) (Butynski 2001; Sarmiento 2003).