What kind of impact does bacteria have on the world around you?

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.