What kind of impact does bacteria have on the world around you?
HarmfulAffects ofBacteria
HarmfulAffects ofBacteria
Beneficial Affects of Bacteria
Beneficial Affects of Bacteria
Bio-remediation
Bio-remediation
RecyclingRecycling
Nitrogen-Fixing
Nitrogen-Fixing
BacteriaGood or
Bad?
BacteriaGood or
Bad?
What’s so great about bacteria?
• No bacteria = no life
=
Nitrogen-FixingBacteria
• Bacteria consume nitrogen from the air and change it into a form that plants can use to grow.
I love to take in nitrogen!
Nature’s Recyclers
• Bacteria breaks down dead organic matter replacing nutrients in the soil.
Bioremediation
• Bacteria used to combat pollution.• The bacteria change the pollutants into
harmless chemicals.
Ex. Industrial, agricultural, oil spills, etc.
How do humans fight bacteria?
Antibiotics!
Antibiotics
• Are medicines used to kill bacteria and other micro-organisms.
• Genetically engineered.
Ex. Penicillin
Penicillin•One of the first One of the first antibiotics; comes antibiotics; comes
from a fungus from a fungus called penicillium.called penicillium.
Alexander Fleming
• Scottish
• 1929
• Discovered penicillium on agar plates but could not purify it.
Florey and Chain
• British Scientists• 1939-1945 WWII• Developed penicillin on an industrial scale
for the public.• Won the Nobel Peace Prize with Fleming.
How does penicillin kill bacteria?
• The bacteria lengthen, but cannot divide. Eventually the weak cell wall ruptures
http://www.cellsalive.com/pen.htm
Other benefits of bacteria…
Insulin• Engineered bacteria that
produce insulin for diabetes.
• Scientists put genes carrying genetic code for human insulin into E. coli. The bacteria makes human insulin.
Food• Cheese, yogurt,
buttermilk, and sour cream are created by lactic-acid bacteria.
• The bacteria digest mild sugar lactose and converts it into lactic acid. (Which preserves and adds flavor)
Using the Essential Question for this lesson, write or bullet the
answer.