By: Ashley Hobson
• In the prokaryote domain
• No nucleus or organelles
• Evolved prior to eukaryotes
• Live in all kinds of places (ie. plants,
colon, sea)
• More bacterial cells in humans than
animal cells
• Can be harmful or helpful
• As unrelated to humans as can be
for a living species
• Oldest fossil bacteria dates back 3.5
billion years
•Green due to photosynthesis and light
• Growth in the dark gives dark orange
coloring
• Tend to form flexible filaments
Chloroflexus auranticus
Gram-positive bacteria are stained dark blue to violet by means of Gram staining.
Their counterparts, gram-negative bacteria, cannot retain the crystal violet stain, and
instead appear red to pink.
Moraxella bovis, pinkeye
• Gram negative
• Bacillus (rod like) shape
• Anaerobic
• Unique outer sheath, “toga” membrane
•Thermotoga lettingae
• Grows on methanol and acetate
• Different from other thermotoga
bacteria, can provide ways to enhance
others
http://micro.magnet.fsu.edu/cells/bacteriacell.html
SPORES!!!
• Provides bacteria
with protection
• Can withstand
extreme
temperatures
• Impervious to
toxic chemicals
• Gram negative
• Found in warm blooded mammals’ large intestines
• Produces Vitamin K for blood clotting
• One strain attacks intestinal walls and enters
bloodstream (0157)
• Spreads in most hospitals
• Infects wounds
• Healing process is delayed
• Methicillin-resistant Staphylo- coccus aureus
http://www.sciencephoto.com/media/12793/
enlarge
Phototrophs
Organotrophs
Lithotrophs
Movement
http://www.youtube.com/watch?v=6p9e0oolbmE
Fission
http://www.youtube.com/watch?v=J6akNYlkehY
Bacteria, specifically
Lactobacillus, gives sourdough
bread it’s signature taste
Yogurt contains the
bacteria, Streptococcus
thermophilus and also
Lactobacillus, which gives it a
texture and tangy taste
Your large intestines house
certain bacteroides which are
responsible for making Vitamin
K, a necessity for blood clotting
Questions?
Sources:
http://www.sciencephoto.com/media/12793/enlarge
http://micro.magnet.fsu.edu/cells/bacteriacell.html
http://www.thestudentroom.co.uk/showthread.php?t=696323
http://www.youtube.com/ (Multiple bacteria videos)