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.
A pilus is typically 7 to 8 nm in diameter, and several hundred pili can extend from the surface of a bacterial cell (see image to right). A fimbria (Latin, meaning fringe; plural: fimbriae) is a short pilus.They are used for attachment of the cell to a surface or other cells, and are either located at the poles of a cell, or are evenly spread over its entire surface. pilus (Latin for 'hair'; plural: pili) is a hairlike protein structure on the surface of a cell, especially Gram-negative bacteria.