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The natural fermentation product of these bacteria, hydrogen gas, can be harnessed as a natural gas energy source. [6] [7] Photofermentation via algae instead of bacteria is used for bioethanol production, among other liquid fuel alternatives. [8] Basic principles of a bioreactor. The photofermentation bioreactor would not include an air pathway.
The mixed acid fermentation pathway in E. coli. [1] [2] End products are highlighted in blue.In biochemistry, mixed acid fermentation is the metabolic process by which a six-carbon sugar (e.g. glucose, C 6 H 12 O 6) is converted into a complex and variable mixture of acids.
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The energy from this exothermic reaction is used to bind inorganic phosphates to ADP, which converts it to ATP, and convert NAD + to NADH. The pyruvates break down into two acetaldehyde molecules and give off two carbon dioxide molecules as waste products.
The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, producing large amounts of energy (ATP). Respiration is one of the key ways a cell releases chemical energy to fuel cellular activity. The overall reaction occurs in a series of biochemical steps, some of which are redox reactions.
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The light-harvesting system of PSI uses multiple copies of the same transmembrane proteins used by PSII. The energy of absorbed light (in the form of delocalized, high-energy electrons) is funneled into the reaction center, where it excites special chlorophyll molecules (P700, with maximum light absorption at 700 nm) to a higher energy level.