Definition of courier: An individual responsible for the exchange of items between two or more parties. Couriers are usually employed by a company that charges a flat rate to the party using the courier service. Federal Express, UPS, DHL, and the United States Post Office all employ couriers to deliver mail and packages.
At least 3 bacterial morphotypes, as well as fungal mycelia, thelastomatid nematodes, and ingested material are found in the hindgut. At annual molt, the lumen bacteria virtually disappear; presumably they are replaced from anterior gut regions, ingested exuvium, and ingested soil.
From Wikipedia, the free encyclopedia. The Ff phages are filamentous phages that infect gram negative bacteria bearing the F episome. The term is used to refer to the closely related group of phages including the f1, fd and M13 phages. The If1 and Ike phage are also closely related to this group.