1) Laboratory technique 
A gene gun or a biolistic particle delivery system, originally designed for plant transformation, is a device for injecting cells with genetic information. The payload is an elemental particle of a heavy metal coated with plasmid DNA. This technique is often simply referred to as bioballistics or biolistics. This device is able to transform almost...
an apparatus that shoots gold or tungsten particles coated with recombinant DNA molecules at high speeds into plant protoplasts