Coccus

Multi tool use
Multi tool use




For the genus of scale insects, see Coccus (insect).

"Cocci" redirects here. For the fungal disease, see Coccidioidomycosis.

Not to be confused with Cocchi.


Arrangement of cocci bacteria en.svg





Staphylococcus bacteria


A coccus (plural cocci) is any bacterium or archaeon that has a spherical, ovoid, or generally round shape.[1] It is one of the three distinct bacterial shapes, the other two being bacillus (rod-shaped) and spiral-shaped cells.


Cocci is an English loanword of a modern or neo-Latin noun, which in turn stems from the Greek masculine noun cóccos (κόκκος) meaning "berry".[2]



Arrangements


Cocci may occur as single cells or remain attached following cell division. Those that remain attached can be classified based on cellular arrangement:[1]




  • 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 (e.g. Sarcina ventriculi).



References





  1. ^ ab Pommerville, J.C. (2013). Fundamentals of Microbiology (10th ed.). Sudbury, MA: Jones & Bartlett. p. 106. ISBN 9781449647964..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ κόκκος. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project











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