The Bacterial Cell By: Ashley Hobson

What are bacteria?

Bacterial Basics: No nucleus or organelles Evolved prior to eukaryotes 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 Non-sulfur Bacteria Green due to photosynthesis and light Growth in the dark gives dark orange coloring Tend to form flexible filaments Chloroflexus auranticus

Gram Positives/Negatives 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 Purple Bacteria Moraxella bovis, pinkeye

Cyanobacteria

Bacteroides Gram negative Bacillus (rod like) shape Anaerobic

Thermotoga Unique outer sheath, “toga” membrane Thermotoga lettingae Grows on methanol and acetate Different from other thermotoga bacteria, can provide ways to enhance others

The Cell Structure http://micro.magnet.fsu.edu/cells/bacteriacell.html

SPORES!!! Provides bacteria with protection Can withstand extreme temperatures Impervious to toxic chemicals

Escherichia coli Gram negative Found in warm blooded mammals’ large intestines Produces Vitamin K for blood clotting One strain attacks intestinal walls and enters bloodstream (0157)

MRSA Spreads in most hospitals Infects wounds Healing process is delayed Methicillin-resistant Staphylo- coccus aureus http://www.sciencephoto.com/media/12793/enlarge

Quoram Sensing

What about food? Phototrophs Organotrophs Lithotrophs

Bacteria Videos Movement http://www.youtube.com/watch?v=6p9e0oolbmE Fission http://www.youtube.com/watch?v=J6akNYlkehY

Bacteria and YOU 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

THE END 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)