(September 13, 2016 at 4:29 pm)Tiberius Wrote:(September 13, 2016 at 2:17 pm)RoadRunner79 Wrote: Convinced of what exactly? All the video shows, is that some bacteria survived and multiplied (it doesn't tell us anything about why or how).
Well, given that the bacteria didn't grow beyond the initial boundary, before rapidly spreading, does seem to suggest that they underwent some sort of change don't you think? Unless you think that there is another reason why the bacteria didn't grow on the antibiotic at first, but then suddenly were able to?
Quote:Also, I don't think that this is all that controversial. Bacteria have been resistant to antibiotics for millions of years.
http://www.ncbi.nlm.nih.gov/pubmed/22509370
Again, the video shows they weren't resistant to this particular antibiotic. If they were, they would not have stopped or even slowed down when they reached the agar that was in contact with it. The antibiotic prevented the bacteria from growing past it, until one of the bacteria developed a mutation which gave it resistance.
Perhaps it would be more apparent in real time, but I didn't see them stop much at all. What I seen could possibly be explained as a bottleneck, where most of the bacteria where not able to survive in the antibiotic, but some where. Once they got through, then they where able to spread in the new medium and start reproduction again. Even a short stop at the changeover could be easily explained in this way. Personally, I didn't see any mutant bacteria ninja turtles in the video (perhaps I missed it). I think you are making an assumption here.
I would be interested in seeing multiple tests ran either side by side, or in succession, started from a very small culture (reduced genetic diversity). It would be interesting to compare the results time wise. I would think, that if the expansion into the antibiotic was the result of some unguided mutation, then the results would be greatly dis-similar. if it was fairly repeatable (which from my knowledge, I am guessing this is), I think that you would be able to reproduce fairly consistent results with reason and given the occasional anomaly.
