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a presentation discussing the different morphological aspects of microorganisms
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Size, Shapes and Arrangements of
Bacteria
Microbiology
Bacterial Shapes
• cocci
• bacilli
• spiral
Coccus
Cocci (pl.) are spherical or oval bacteria having one of several distinct arrangements based on their planes of division.
Arrangements of Cocci
• division in one plane– diplococcus (pairs)– streptococcus (chains)
• division in two planes– tetrad (squares of four)
• division in three planes– sarcina (cubes of eight)
• random planes
Diplococcus
Streptococcus pneumoniae
Streptococcus
Streptococcus pyogenes
Tetrad
Micrococcus luteus
Sarcina
Sarcina Spp.
Random/Clusters
Staphylococcus aureus
Bacillus
Bacilli (pl.) are rod-shaped bacteria. Bacilli all divide in one plane producing a bacillus, streptobacillus, or coccobacillus arrangement.
Arrangment of Bacilli
• bacilli (single)
• diplobacilli (pairs, few)
• streptobacilli (chains)
• coccobacilli (oval)
Bacilli
Pseudomonas aeruginosa
Diplobacilli
Moraxella catarrhalis
Streptobacilli
Bacillus subtilis
Coccobacilli
Bortedella pertussis
Spiral
Spirals come in one of three forms: – vibrio (comma-shaped)– spirillum (thick, rigid spiral)– spirochete (thin, flexible spiral)
Vibrio
Vibrio cholerae
Spirillum
Spirillum volutans
Spirochete
Treponema pallidum Leptospira interrogans
FINISH!