If pressure from outside the lungs causes atelectasis, your doctor will treat the cause of the pressure. For example, if the cause is a tumor or fluid buildup, your doctor will remove the tumor or fluid. This will allow your lung to fully expand. Atelectasis Caused by a Blockage
Pilus. Definition. noun, plural: pili. (microbiology) Short, filamentous projection on a bacterial cell, used not for motility but for adhering to other bacterial cell (especially for mating) or to animal cells. Supplement. Bacterial pili are involved in cell adhesion.
Bacteria come in three main shapes: 1) Spherical (like a ball). These are usually the simplest ones. Bacteria shaped like this are called cocci (singular coccus). 2) Rod shaped. These are known as bacilli (singular bacillus). Some of the rod-shaped bacteria are curved; these are known as vibrio.