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Coccus

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Coccus coccus


A coccus (plural cocci) is any bacterium that has a spherical, ovoid, or generally round shape. It is one of the three distinct bacterial shapes, the other two being bacillus (rod-shaped) and spiral-shaped cells.

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Coccus Coccus Wikipedia

Cocci is an English loanword of a modern or neo-Latin noun, which in turn stems from the Greek masculine noun kokkos (κόκκος) meaning "berry".

Coccus Coccus definition of coccus by Medical dictionary

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Arrangements

Cocci may occur as single cells or remain attached following cell division. Those that remain attached can be classified based on cellular arrangement:

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  • Diplococci are pairs of cocci (e.g. Streptococcus pneumoniae and Neisseria gonorrhoeae)
  • Streptococci are chains of cocci (e.g. Streptococcus pyogenes).
  • Staphylococci are irregular (grape-like) clusters of cocci (e.g. Staphylococcus aureus).
  • Tetrads are clusters of four cocci arranged within the same plane (e.g. Micrococcus sp.).
  • Sarcina is a genus of bacteria that are found in cuboidal arrangements of eight cocci.


  • Coccus

    References

    Coccus Wikipedia


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