Serratia marcescens can form brilliant red colonies on LB agar due to the synthesis of the secondary metabolite prodigiosin. In the Microbiology teaching lab, we had students create pigment mutants of S. marcescens and these lovely shades of pink and white were collected for analysis. Read More
These are two harmless lab strains of E. coli. One can ferment the sugar lactose into acidic byproducts and the other cannot. MacConkey media contains an indicator dye that turns from red to yellow when the pH is raised. The four pink streaks were drawn with a culture of the lactose fermenter (t... Read More
Klebsiella pneumoniae grown on blood agar for 48 hrs at 37 degree's C. Read More
Fungal contaminant on TSA grown at refrigerated temperatures for 1 month. Colonies appeared rhizoid throughout with a fluffy appearance. Read More
Different view of TSA plate with fungal contaminant, presumably from the air, after 1 month at refrigerated temperatures. White center spore formation can be seen with white hypae on the edges. Spore formation can be see forming towards the edges. Read More
Unknown fungal contaminant on TSA after growth at refrigerated temperatures for 1 month. White hypae can be seen at the edges with green spore formation starting in the center. Read More
MacConkey agar plate with invasive lactose fermenting E.coli which was isolated for fatal case of neonatal septicemia.
Photo was taken after 12h incubation under 37C.
Credits: Povilas Kavaliauskas, Vilnius University, Lithuania. Read More
A dimorphic fungi Exophiala dermatitidis was grown on Saburaud Choramphenicol agar for 3 weeks. After this a sterile polilysine coated coverslip was applied on colony to collect fungal elements. Coverslip was fixed in glutaraldehyde, dried and observed using Hitachi Scanning Electron Microscope.... Read More