Written By: Plasmid, in microbiology, an extrachromosomal genetic element that occurs in many bacterial strains. Plasmids are circular deoxyribonucleic acid (DNA) molecules that replicate independently of the bacterial chromosome. They are not essential for the bacterium but may confer a selective advantage.
A gnat /ËnÃ¦t/ is any of many species of tiny flying insects in the Dipterid suborder Nematocera, especially those in the families Mycetophilidae, Anisopodidae and Sciaridae. They can be both biting and non-biting. Most often they fly in large flocks resembling clouds.
Fungus gnats are tiny flying insects that can be a problem for houseplants and greenhouse plants. Not only are fungus gnats annoying as they fly around, but they can also do some serious damage to plants. Fungus gnats are mosquito-like insects, about an eighth of an inch long with one pair of transparent wings.