A stent is a small mesh tube that's used to treat narrow or weak arteries. Arteries are blood vessels that carry blood away from your heart to other parts of your body. A stent is placed in an artery as part of a procedure called percutaneous coronary intervention (PCI), also known as coronary angioplasty. PCI restores blood flow through narrow or blocked arteries. A stent helps support the inner wall of the artery in the months or years after PCI.
Main Difference â Flagella vs Pili. Flagella and pili are appendages found in the invertebrate cell body. Both flagella and pili are made up of proteins. Flagella are whip-like and pili are hair-like. Flagella are extended from the interior cell body while pili extend from the cell surface. pili are mostly found in bacteria.
Bacteria possessing pili include Neisseria gonorrhoeae and some strains of Escherichia coli, Salmonella and Shigella species. Fimbriae (pili) are shorter, straighter and more numerous than bacterial flagella and are composed by subunits of protein called pilin. Example: Mutants of Neisseria gonorrhoeae that do not form pili are nonpathogen. 2  Sex pili (conjugation tube): It is a specialized kind of pili that forms the attachment between male (donor) and the female (recipient) bacteria during conjugation and acts as a conduit for the passage of DNA.