Organism Aerotolerance Mode of Metabolism Metabolic reaction

Aerobic Heterotrophs Obligate Aerobe Chemoheterotrophic C₆H₁₂O₆+6O₂------->6CO₂+6H₂O

Cyanobacteria Aerobe ???? 6CO₂+6H₂O----hv--------------->C₆H₁₂O₆+6O₂

H₂S Oxidizers(Beggiatoa) Microaerophilic ???? CO₂+H₂S---->CH₂O+S^o

Purple non-sulfurbacteria Microaerophilic anaerobe ???? CH₂O----->CO₂+H₂, andCO₂+H₂---hv---> CH₂O

Purple sulfur bacteria anaerobe ???? CO₂+H₂S---hv--->CH₂O+S^o

Green sulfur bacteria anaerobe ???? CO₂+H₂S---hv--->CH₂O+S^o

Sulfate reducers anaerobe ???? CH₂O+SO₄^2------>CO₂+H₂S

hv represents light

CH₂O represents organic carbon

1) Why is CaSO₄mixed into the lowermost, enrichedslurry when making the column?

2) Why does H₂S accumulate in the most anaerobicregion of the column?

3) In what ways does photosynthesis differe betweencyanobacteria and the green and purple sulfur bacteria?

4) Why can chemoheterotrophs grow throughout the column?

Question

hv represents light

CH₂O represents organic carbon

1) Why is CaSO₄mixed into the lowermost, enrichedslurry when making the column?

2) Why does H₂S accumulate in the most anaerobicregion of the column?

3) In what ways does photosynthesis differe betweencyanobacteria and the green and purple sulfur bacteria?

4) Why can chemoheterotrophs grow throughout the column?

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