University you say? Is there anyone there you work with that might have access to a testing facility for these strange byproducts produced by our cells?
When Ravi was more in the limelight back in the day, he revealed he was noticing a faint glow radiating from inside the tubes. At the time, I was less educated in the art and I went to investigate cavitation and sonoluminescence. But, now I know he was seeing a coronal discharge of some sort. I am currently researching coronal discharges and have just recently found that it is very possible the UV created from the coronal discharge may in fact be causing a photoelectric effect from the cathode or maybe even the anode. At this point I can only assume that any coating on either electrode would inhibit this effect. If in fact, we can photo-ionize stainless steel with UV, then we will have an abundance of free electrons in the medium which may be influenced by high voltages and certain frequencies to cause further ionization by collision. That's just an assumption so far though.