I'm in college, currently studying Biomedical Science. As part of my course I have to undergo 6 weeks of experiments. I have chosen to investigate the sensitivity of E.coli k12 to UV light.
I have a very general question as to why some of my plates have a confluent growth of individual colonies and others have a confluent mat growth? (they were all inoculated using lawn spread technique).
I have attached a couple of pictures (I don't know how well they will turn out).