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.
A Gram positive bacterium has a thick layer of peptidoglycan (left). A Gram negative bacterium has a thin peptidoglycan layer and an outer membrane (right). Structures in () are not found in all bacteria. The lack of a nuclear membrane simplifies the requirements and control mechanisms for the synthesis of proteins.acterial Morphology Bacterial Structure :: Cytoplasmic Structures :: Gram positive and Gram negative bacteria have similar internal, but very different external structures. The cytoplasm of the bacterial cell contains the DNA chromosome, the mRNA, ribosomes, proteins, and metabolites).