Slide 1

FERMENTATIONS Pasteur defined FERMENTATION as life in the absence of oxygen Fermentations are nowadays defined as a processes that do not involve electron transport chains that use oxygen, nitrate or other electron acceptors The majority of fermentations generate ATP by substrate level phosphorylation Microorganisms can be classified as Facultative anaerobes Strict anaerobes

Slide 2

Ethanol Fermentation Yeast

Slide 3

Bacteria Zymomonas mobilisPULQUE

Slide 4

LACTIC ACID FERMENTATION Homofermentative pathway

Slide 5

HETEROFERMENTATIVE PATHWAY

Slide 6

BIFIDUM PATHWAY

Slide 7

Slide 8

BUTIRATE AND BUTANOL/CETONE FERMENTATIONS

Slide 9

Slide 10

Slide 11

Slide 12

Slide 13

Linear and branched fermentative pathways

Slide 14

Slide 15

Slide 16

MIXED ACID FERMENTATION

Slide 17

Slide 18

Slide 19

Slide 20

Slide 21

Slide 22

Slide 23

METHANE FERMENTATION

Slide 24

Slide 25

Slide 26

ATP synthesis only occurs due to protonmotive force

Slide 27