Question 1

Is nanowire conductivity metallic-like or by electron hopping?

Accepted Answer

The question remains open and depends partly on the organism and the measurement. Reported evidence supports both pictures, and results differ with hydration, temperature dependence, and how contacts were made. A doctoral project is better framed around a specific measurable prediction that separates the models than around picking a side at the outset.

Question 2

Which controls are essential in electrode experiments?

Accepted Answer

Abiotic reactors under the same medium and potential, cell-free supernatant tests to check for soluble shuttles, and a heat-killed or metabolically inactive biomass control. Report the reference electrode and convert potentials to a stated standard. Without these, a current trace cannot be attributed to respiration rather than to medium chemistry.

Question 3

How should filament conductivity be measured credibly?

Accepted Answer

State the geometry, the contact material and method, the humidity, and the applied bias range, then repeat on several independent filaments. Four-probe arrangements avoid contact resistance that two-probe setups cannot separate. Measurements on dried preparations should be labelled as such, since hydration changes the result substantially.

Question 4

Do I need a genetics background for this work?

Accepted Answer

It helps considerably. Assigning a function to a specific cytochrome or pilin usually rests on a strain lacking that gene, complemented back to confirm the effect. Model organisms in this area have workable genetic systems, so a project that avoids genetics entirely often ends up with correlative evidence that reviewers find weak.

Question 5

What can cyclic voltammetry reliably tell me?

Accepted Answer

It reports the potentials at which charge moves and how that changes with scan rate, which constrains the redox species involved. It does not identify a protein on its own. Pair the peak positions with spectroscopic evidence or with a mutant that lacks the candidate, and report scan rates and electrolyte with every trace.

Question 6

How important is biofilm architecture to the results?

Accepted Answer

Very. Current output depends on how thick the biofilm is, how it is distributed over the electrode, and how old it is at sampling. Two reactors with the same organism can differ several-fold on architecture alone, so record thickness, coverage, and age, and normalise output to a stated basis.

Microbiology

Microbiology

Research Frontiers in Microbial Nanowire Electron Transfer and Extracellular Respiration