Sheath, Prosthecae and Stalk

SHEATH, PROSTHECAE AND STALK

Sheath

  • It is seen in some bacteria in fresh water or marine environments. The chains or trichomes are enclosed by a hollow tube.
  • Sometimes the sheaths may be impregnated with ferric or manganese hydroxides. This strengthens them.

Prosthecae (Prostheca)

  • They are semi rigid extensions of the cell wall and cytoplasmic membrane.
  • The diameter of these extensions is less than that of the cell. It is seen in many aerobic bacteria in fresh water and marine environments.

Stalk

  • Nonliving ribbon like or tubular appendages that are excreted by the cell. They aid in attachment.
Last modified: Monday, 20 September 2010, 10:18 AM