Clostridium

The members of this genus are phylogenetically distinct but morphologically same to   Bacillus.   They   are   sometimes referred to   as   clostridia and   lack   any respiratory chain. This renders them obligate anaerobes generating ATP solely through substrate-level phosphorylation. Although organisms like as Clostridium tetani tetanus, food poisoning, C. perfringens gas gangrene and C. botulinum cause medical problems, Clostridium acetobutylicum can be used to biologically synthesize butanol, ethanol, isopropanol and other alcohols rather than using fossil fuel-based alternatives.