It is easy and. inexpensive to test for coliform bacteria. If testing detects coliform bacteria in a water sample, water systems search for the source of contamination and restore safe drinking water.
The osteon, or Haversian system, is the fundamental functional unit of much compact bone. Osteons, roughly cylindrical structures that are typically several millimeters long and around 0.2 mm in diameter. Each osteon consists of concentric layers, or lamellae, of compact bone tissue that surround a central canal, the Haversian canal. The Haversian canal contains the boneâs nerve and blood supplies. Osteoblasts form the lamellae sequentially, from the most external inward toward the Haversian canal.
Osteons, or the structure that forms compact bone, surround these canals and are the outer component of the haversian system. The terms osteons and haversian system are often used interchangeably. Haversian systems are units of structure within mature bone. The systems run parallel to the long axis of bones. Each cylindrical unit within compact bone is an entire haversian system. The system includes lamellae, osteocytes, lacunae, canaliculi and a haversian canal. Lamellae are the thin layers that compile and eventually form bone. They contain collagen fibers that are arranged in a parallel array.