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.
Pili: 1  Structure: Short, thin, straight, hairlike projections form surface of some bacteria. Composed of protein pilin, carbohydrate and phosphate. 2  Function: Take part in adhesion of pathogen to specific host tissues. Sex pili are involved in genetic material exchange between mating bacterial cells.