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by Eleina M. England
Institution: | MIT |
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Department: | Department of Biology |
Degree: | |
Year: | 2014 |
Keywords: | Biology. |
Posted: | |
Record ID: | 2043979 |
Full text PDF: | http://hdl.handle.net/1721.1/87468 |
Two studies were performed on Bacillus subtilis phages SP16 and SP-beta to characterize the effects of growth and an integrative conjugative element, ICEBs1, respectively. I found that B. subtilis strains are significantly more susceptible to SP16 infection early in the growth phase and less susceptible during exponential growth and as cells approach stationary phase. SP16 makes plaques of different sizes. I found that this variegated plaque size did not seem to breed true. That is, phage from large plaques gave rise to both large and small plaques. On the other hand, phage were difficult to recover from small plaques, indicating that the phage were either not viable or gave rise to small plaques that were barely visible. A second study analyzed growth of SP-beta and established the time required for a single round of phage growth. I verified that presence of ICEBs1 in the B. subtilis chromosome, prevented lytic production of SP-beta. I also verified that this phenotype was due to a single gene in ICEBs1.
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