Redox and Free Energy Flashcards
What is an OMC?
Outer membrane multi-haem cytochrome
In some bacterial cells what plays a key role in electron conduction between the cell and a material/electrose?
Outer membrane multi-haem cytochromes
How are multi-haem cytochromes thought to help electron conduction?
They act as a scaffold for a ‘wire’ of haem groups
How do some species of bacteria deliver elecrons to/from substrates?
Through long protruding ‘nanowires’
In G.sulfurreductens what make up the protruding nanowires?
- Type IV Protein Pili with stacked aromatic amino acids that provide conductivity
- Attached cytochromes to reduce Iron
How can the direction of electron flow between 2 redox couples be predicted?
By comparing the values of Eº1
Where are negative potentials on plots of Eº1 ?
At the top
What is the faraday constant?
The amount of electric charge per mole of electrons
What affects the free energy change for a redox reaction?
Its direction
What shape plot is produced if E is plotted against the % of the redox couple in the reduced state?
A sigmoidal plot
What is Em?
E when [ox]=[red] and has the same value as the standard reduction potential Eº
How can n be determined by plotting the Nerst equation?
The slope of the line
How can Em be determined from a plot of the Nerst equation?
The y intercept