Guarana is one of several energy producing ingredients and contains a substance known as theobromine, which is similar in chemical composition to the molecules found in chocolate. 瓜拉那是其中一种产生能量的成份，它含有一种叫可可碱的物质，其化学成份与巧克力所含分子的化学成份类似。
Denitrification is a microbial process in which oxidized nitrogen compounds are used as alternative electron acceptors for energy production. 摘要反硝化是微生物以氮氧化物作为电子受体产生能量的过程。
