biosphere in a bottle - seql
TRANSCRIPT
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BIOSPHERE IN A BOTTLE
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WHAT IS A BIOSPHERE?
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GULF OF MEXICO DEAD ZONE
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WHAT CAUSES THE DEAD ZONE?
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BIOTIC OR ABIOTIC FACTOR?
Biot
ic fa
ctor
Abi
otic
facto
r
82%
18%
1. Biotic factor2. Abiotic factor
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BIOTIC OR ABIOTIC FACTOR?
Biot
ic fa
ctor
Abi
otic
facto
r
86%
14%
1. Biotic factor2. Abiotic factor
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WHERE ELSE MIGHT WE FIND DEAD ZONES?
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TAKE HOME MESSAGE?
Microorganisms consume oxygen as they eat.Too much nutrients can result in lack of oxygen in an ecosystem.
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HOW CAN WE MAKE MORE OXYGEN?
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WHAT IS PHOTOSYNTHESIS
Usin
g ligh
t to.
..
Usin
g ligh
t to.
..
Usin
g ligh
t to.
..
8%
57%
35%
1. Using light to make sugar.
2. Using light to make oxygen.
3. Using light to make oxygen and sugar.
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WHICH DON’T DO PHOTOSYNTHESIS?
Plan
ts
Prot
ists
Bac
teria
Fung
i
0%
51%
14%
35%
1. Plants2. Protists3. Bacteria4. Fungi
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HUNTING PHOTOSYNTHETIC MICROORGANISMS
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MICROBIAL MATS
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WHAT CAUSES THE LAYERS?
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WHY DO ROTTEN EGGS SMELL BAD?
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WHAT CAUSES OLD EGGS TO SMELL?
Hyd
roge
n sul
fi...
Sulfu
ric ac
id Ca
rbon
diox
ide
Met
hane
Nat
ural
gas
54%
46%
0%0%0%
1. Hydrogen sulfide2. Sulfuric acid3. Carbon dioxide4. Methane5. Natural gas
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WHERE DOES THE H2S COME FROM?
Eggs
abso
rb H
2...
Sulfu
r in t
he ...
Bac
teria
mak
e ...
0%
76%
24%
1. Eggs absorb H2S from the surrounding air.
2. Sulfur in the egg is chemically converted to H2S.
3. Bacteria make H2S from egg components.
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WHAT IS THE STATE OF H2S?
Solid
Liqu
id
Gas
0%
84%
16%
1. Solid2. Liquid3. Gas
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STUDYING OXYGEN, CARBON AND SULFUR CYCLES
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ILLUSTRATION OF THE FACTORS THAT CAUSE MICROBIAL MAT LAYERS TO FORM
Biotic and Abiotic factors?
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START WITH A HOMOGENOUS MIXTURE.
Algae Make and need oxygen
Purple non-sulfur bacteriaDon’t like oxygen or sulfur
Purple sulfur bacteriaDon’t like oxygen but like sulfur
Green sulfur bacteriaDon’t like oxygen but like lots of sulfur
Sulfate reducing bacteriaDon’t like oxygen