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.
Bacterial Cell Structure and Function. Cellular world can be divided into two types, depending on the presence of nuclei inside cells. Eukaryotic cells have a well-defined nucleus surrounded by a nuclear envelope, whereas prokaryotic cells lack this compartment. All bacteria are prokaryotes. We will discover the structure and function of bacteria in this article. What do bacteria look like? When observing bacteria with microscope, it is not difficult to compare bacterial cell shapes and arrangements. There are many bacterial morphologies, each of them with a specific name. 1  Rod-shaped (Baccilus) i.e. Escherichia coli, Bacillus cereus. 2  Spherical (Coccus): i.e. Staphylococcus epiderminis. 3  Curved (Vibrio, Spirochaete) i.e. Vibrio cholera, Rhodospirilium rubrum. 4  Square-shaped (Arcula) 5  Star-shaped (Stella)