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.
1 a hair or hairlike structure. 2 (in microbiology) a fine filamentous appendage found on certain bacteria and similar to flagellum except that it is shorter, straighter, and found in greater quantities in the organism. Pili consist solely of protein and are associated with antigenic properties of the cell surface.here are two kinds of pili: (a) a larger form that is hollow and found on male bacterial cells only; it is used in bacterial cell conjugation, and (b) a smaller form which is of major significance in adherence of bacterial cells to epithelial surfaces such as the intestinal mucosa or mammary gland epithelium.