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How symbiotic bacteria use metabolic processes to produce bi

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Jasdeep Grewal

on 12 November 2014

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Transcript of How symbiotic bacteria use metabolic processes to produce bi

How symbiotic bacteria use metabolic processes to produce biohydrogen from food waste.
Photo-Fermentation
Photo-fermentation method of producing bio-hydrogen
process occurs with the enzyme nitrogenase.
process uses light energy and food waste.
"Light energy and food waste go into a bacterial photosystem which produces two electrons and four ATP molecules. Then these products are then sent to the nitrogenase that are used to produce H2."
What is symbiotic bacteria?
Symbiotic Bacteria need another organism or each other to survive. (Two bacteria depending on each other )

Symbiotic bacteria are able to live in or on plant or animal tissue.

In symbiosis, at least one member of the pair benefits from the relationship

Ex. Bacteria that live inside the human digestive system. These microbes break down food and produce vitamins that humans need. In return, the bacteria benefit from the stable environment inside the intestines.
What is Bio-Hydrogen?
Biohydrogen is defined as hydrogen produced biologically
most commonly by algae, bacteria and archaea.
Biohydrogen is a potential biofuel obtainable from both cultivation and from waste organic materials
Metabolic Processes
Metabolic processes are processes the cells take that are necessary to live
two types of metabolic processes: catabolic and anabolic.
Catabolic - break molecules to release energy.
Anabolic - build molecules and from smaller molecules amd fuse energy with them.
Fermentation is a metabolic process that releases energy; fermentation takes place anaerobically and requires a sugar substrate.

Dark Fermentation
Dark Fermentation uses food waste as a substrate.
food waste partakes fermentation without light energy.
Products are H2 and CO2.
The pH and partial pressure determines how effective dark fermentation is
It is proven that dark fermentation is the most space and time effective.
Indirect Bio-photolysis
Stage 1: the electrons go to the ferredoxin then to the cell material as opposed to going straight through the cell material.

Stage 2: Fermentation takes place which produces two electrons when then go through hydrogenase to become H2.
source:http://abrarquarnain.weebly.com/photosynthetic-methods.html
Direct Bio-photolysis
Uses PSI & PSII to convert light energy into chemical energy.
PSI and PSII absorb light energy and water.
Light absorbed by PSI excites electrons
electrons move through cyclic cycle producing ATP.
The light energy absorbed by PSII produces electrons
electrons move to ferredoxin using energy from PSI.
electrons get taken by hydrogenase from the ferredoxin which then are used to produce H2.
source:http://abrarquarnain.weebly.com/photosynthetic-methods.html
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