bacteria 1.structure: all microscopic, unicellular or colonial prokaryotic (lack true nucleus)
TRANSCRIPT
Bacteria
Bacteria
1. Structure: all microscopic, unicellular or colonial Prokaryotic (lack true nucleus)
Bacteria
1. Structure: all microscopic, unicellular or colonial Prokaryotic (lack true nucleus) Bacillus (rods) Coccus (spherical) Spirilla (spiral) Most immobile, few with flagella
Bacteria
Rod-Shaped Bacteria
On the head of a pin!
Magnified 25,000 times!
Bacteria
2. Reproduction asexual by fission (simple cell division, divide into
two equal sizes (every 20 min.) Sexual by conjugation 3. Physiology Autotrophic, parasitic, saprophytic (live on dead
organisms) Aerobic (use oxygen) and anaerobic (don’t use
oxygen4. Where do they live? EVERYWHERE
Bacteria are found in Geyser Hot Springs
Black Rock Desert,
Nevada.
Temperatures just below boiling - colors are the result of various bacterial colonies.
Bacteria
5. Diseases (more examples to follow) Tetanus, TB, cholera, bubonic plague,
syphilis, typhoid, anthrax, pneumonia, diptheria, strep throat, salmonella, botulism,
6. Benefits Organic decay, antibiotics, yogurt, cheese,
support life in hydrothermal vents.
Leprosy: caused by a bacterial infection
Normal tissue in the center
Infected tissue on the left
Leprosy
Affected hands shown here.
Leprosy Again.
Impetigo
Highly contagious childhood disease
Bacterial infection that leaves scabs and pigment loss
Gonococcal Bacterial Infection of the Eye
Most common in newborns who are infected as they pass through the birth canal
Adults can transfer the bacteria to the eye from the genitals
Gangrene
Caused by anaerobic bacteria whose toxins kill tissue
Amputations are common
Can be lethal if not treated
Strep Throat
Bacterial infection most common in 5-15 year olds
Tonsils swell with pus-filled lesions
Strep Throat Again
Pus-filled lesions on the tonsils
Diptheria (bacterial infection)
Less than 10 cases per year in the USA
Bacteria form a membrane that causes bleeding and blocks the airway
Infected Lung Cell
Infected (via adhesion)by numerous mycoplasma bacterium
This is the bacteria that causes pneumonia
Advanced Periodontal Disease
Severe gum inflammation
Caused by a bacterial infection
Salmonella typhic (bacterium)
Causative agent of typhoid (rare in USA)
Bacteria invade upper intestine causing nausea and headaches - lasting 4-5 weeks
Anthrax Lesion (Bacterial Infection)
Sheep wool is often the carrier
Warning: Next Slide fairly graphic
Necrotizing Subcutaneous Infection (Necrotizing Fasciitis NF)
Caused by a bacterial infection - commonly referred to as “Flesh Eating Bacteria”
Bacteria release toxins that directly kill tissue
NF Again
Although rare, the bacteria can be found almost everywhere - once infected tissue loss is rapid
Shock and death are possible
NF Again
Requires large-scale tissue removal and heavy doses of antibiotics
The End
Remember bacteria are everywhere!
Wash your hands often!