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 Bacilli (or bacillus for a single cell) are rod-shaped bacteria. 2  Spirilla (or spirillum for a single cell) are curved bacteria which can range from a gently curved shape to a corkscrew-like spiral. 3  Many spirilla are rigid and capable of movement.or rod-shaped or filamentous bacteria, length is 1-10 Âµm and diameter is 0.25-1 .0 Âµm. 1  E. coli, a bacillus of about average size is 1.1 to 1.5 Âµm wide by 2.0 to 6.0 Âµm long. 2  Spirochaetes occasionally reach 500 Âµm in length and the cyanobacterium. 3  Oscillatoria is about 7 Âµm in diameter.