Population Growth Rate, Year ended 31 March 2015. 1  The preliminary estimated resident population (ERP) of Australia at 31 March 2015 was 23,714,300 people. 2  This reflects an increase of 316,000 people since 31 March 2014, and 93,900 people since 30 December 2014.
Types: Two general types of Pili are known they are: Sex pili and Common pili. Medical Importance of Fimbriae or Pili. 1  Common pili (Adhesins): They mediate the attachment of bacteria to specific receptors on the human cell surface, which is the first step in establishing infection in some organisms.2  Example: Mutants of Neisseria gonorrhoeae that do not form pili are nonpathogen. 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.
Pili and fimbriae are structurally similar to flagella and are composed of one or a few proteins arranged in a helical fashion. Figure 2-49 shows pili isolated from Neisseria gonorrhea. Each protein subunit assembles on the growing structure at the tip, as is the case with flagella.igure 2.49 Pili and fimbriae. The pili shown in this micrograph are those of Neisseria gonorrhea with Tobacco Mosaic virus (the thicker structures) added as a size reference. The width of the Tobacco Mosaic virus is 0.018 Âµm.