Why have I posted this?
Because Luca has just published an interesting paper measuring the electron spin changes in fruit flies, whilst they are under the effect of different types of General Anesthetic's (GA). Here's the paper...
http://m.pnas.org/content/early/2014/08/06/1404387111.full.pdf
Firstly, Luca measured changes in fruit flies electron spin measurements, when they were exposed to General Anesthetics. He then measured the electron spin of mutant-GA-resistant fruit flies, vs, none-GA-resistant fruit flies when they were exposed to General Anesthetics, and found differences between electron spin of both types of fruit fly, which seems pretty interesting to me.
It seems to me that Luca has been influenced by his work on 'smell' (above). If I've understood his paper, I guess he is suggesting that different General Anesthetic compounds may cause us to lose consciousness by acting as an 'absorber', which allows electrons to tunnel out of the hydrophobic pockets within proteins, disrupting consciousness. Obviously this has some similarity with Stuart Hameroff's ideas, and Stuart seems a little too dismissive of this research.
It's highly speculative of course, but the electron spin changes they measured would seem to have some sort of relationship with General Anesthetic's, simply because of the difference measured in the mutant-GA-resistant flies. Really interesting...
BBC Radio 4 had a short interview with Luca last Thursday...
http://www.bbc.co.uk/programmes/b04d4tzp