Pictures of growth of engineered Chromobacterium violaceum on different agar media at 30 degree Celsius

Chromobacterium violaceum
is a beta-proteobacteria capable of synthesizing and secreting hydrogen cyanide
that could be used in leaching gold from electronic scrap material. Efforts
have been directed to improve hydrogen cyanide biosynthesis through genetic
engineering. This dataset describes pictures of engineered C. violaceum
during growth on different agar media at 30 oC. One key observation
was the discolouration of purple pigment during growth of C. violaceum
on formulated minimal salts agar compared to rich agar media like LB and Tryptic
Soy Agar (TSA). This could be due to lack of nutritional L-tryptophan in
minimal salts agar medium that otherwise would fuel the biosynthesis of violacein antibiotic
which endows the C. violaceum colonies with purple colouration on rich agar
media.