Dictionary > Enterobacteriaceae

Enterobacteriaceae

Definition
noun:
(taxonomy) A family of gram-negative bacilli that inhabit the large intestine of humans and other mammals
Supplement
The family Enterobacteriaceae includes gram-negative bacilli and belongs to Class Gammaproteobacteria. Members of the family Enterobacteriaceae are mostly nonpathogenic and present in the lower part of the intestine of their human and other mammalian hosts as commensals and symbionts. They are part of the normal gut flora, providing by synthesizing vitamin K, which the hosts are unable to synthesize on their own. Nevertheless, some of them may become opportunists or pathogenic, causing diseases such as gastroenteritis, urinary tract infections, etc.
They are typically 1-5 μm in length. They lack cytochrome C oxidase, except for Plesiomonas shigelloides. They are facultative anaerobes, fermenting sugars to produce lactic acid. Most of them reduce nitrate to nitrite; an exception to this is Photorhabdus species. Many of them have flagella as their locomotory organ. On blood agar, they appear as small grey colonies. They are non-spore-forming.
Enterobacteriaceae includes the following genera:

  • Citrobacter
  • Cronobacter
  • Enterobacter
  • Escherichia, e.g. E. coli
  • Hafnia
  • Klebsiella
  • Pantoea
  • Plesiomonas
  • Proteus
  • Raoultella
  • Salmonella
  • Serratia
  • Shigella

Word origin: Greek énteron (intestine)
Scientific classification:

Other common name(s):

  • enterobacteria
  • See also:


    You will also like...

    Sugar Homeostasis
    Sugar Homeostasis

    The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

    Early Earth
    The Origins of Life

    This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

    Neurology of Illusions
    Neurology of Illusions

    Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

    Plant Water Regulation
    Plant Water Regulation

    Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

    Circulation
    Circulation

    The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

    Growth Patterns
    Growth Patterns

    This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..