The characteristics of bacteria can be seen by the size, colour, shape and consistency of a colony. In a liquid medium, the region in which the organism grows depends on the oxygen requirement of that specific species.
Shapes
Bacillus (singular);
Bacilli (plural);
Rod-like shaped
Sources:
http://www.lima.ohio-state.edu/academics/biology/biodiv/monera/bacgrpos.jpg
http://www.lima.ohio-state.edu/biology/biodiv/webbact.htm
Spirilla
(Helical shape like corkscrew)
Sources:
http://www.lima.ohio-state.edu/academics/biology/biodiv/monera/spirillum.jpg
Coccus (singular);
Cocci (plural);
Spherical
Sources:
http://biology.northwestcollege.edu/biology/b1010lab/bactypes.htm
Vibrios
(Curve rods)
Sources:
http://microbewiki.kenyon.edu/images/5/55/96524K.jpg
Arrangements
Sources:
http://www.mansfield.ohio-state.edu/~sabedon/biol2010.htm
Sources:
http://www.mansfield.ohio-state.edu/~sabedon/biol2010.htm
Morphology on solid media
Pigmentation
• Transparent
• Opaque
• Colour pigment
• Fluorescent pigment
Surface properties
• Flat
• Raised
• Wrinkled
• Smooth
• Growth pattern – motile or non motile
• Filamentous and rhizoid
• Contoured
Sources: http://www.mansfield.ohio-state.edu/~sabedon/biol2010.htm
Smell
• Sweet
• Alcohol
• Foul
Morphology in broth media (test tube)
• Turbid - at the middle
• Pellicle – thick growth at the top of the tube
• Sediment – settle at the bottom
Sources: http://student.ccbcmd.edu/courses/bio141/labmanua/lab2/brothbs.html
Morphology on slant media
• Even (it follows the line of the original streak)
• Irregular (slight spreading from the original line)
• Spreading (the organisms cover the entire surfaces of the slant
Sources: http://chsweb.lr.k12.nj.us/psidelsky/Saurs.gif
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