Sulfur Reduction and Oxidation

Question 1

TEA for Sulfate Reducing Bacteria

Answer 1

Sulfate, sometimes Thiosulfate

Question 2

SRB

Answer 2

Sulfate Reducing Bacteria

Question 3

Conditions where SRBs can be found

Answer 3

anoxic and sulfate present

Question 4

growth of SRBs (and PEDs)

Answer 4

chemolitho on H2
hetero on small organics

Question 5

waste product of SRBs

Answer 5

sulfide, water, and sulfate (when thiosulfate is the TEA)

Question 6

How can sulfur oxidizers be distinguished from anaerobic sulfur photosynthesizers?

Answer 6

they are colorless

Question 7

How do sulfur oxidizers work?

Answer 7

they oxide reduced sulfur compounds aerobically, producing sulfuric acid (sulfate and hydrogen ions)

Question 8

PEDs for sulfur oxidizers

Answer 8

reduced sulfur compounds and Fe2+

Question 9

what class of microbes has syntrophic relationship with SRBs?

Answer 9

Sulfide Oxidizers

Question 10

how are SRBs (anoxic) and Sulfide Oxidizers (aerobic) able to have syntrophic relationship?

Answer 10

gradient of oxygen levels, thus diffusion of species, in microbial mats