An organism cultured from fecal samples. is it possible that some coliforms appear green on TCBS agar. if so, which ones?
Typical colony morphology on TCBS
V. cholerae ......................... Large yellow colonies.
V. parahaemolyticus .........Colonies with blue to green centers.
V. alginolyticus .................. Large yellow mucoidal colonies.
V. harveyi / V. fischeri........Greyish-green to bluish-green colonies which show luminescence in dark. Older colonies fail to show bioluminescence.
Proteus/Enterococci ...........Partial inhibition. If growth, colonies are small and yellow to translucent.
Pseudomonas/Aeromonas .... Partial inhibition. If growth, colonies are blue.
https://en.wikipedia.org/wiki/Thiosulfate-citrate-bile_salts-sucrose_agar
Yellow colonies on TCBS Agar are because of fermentation of sucrose, as Bromothymol blue and thymol blue are the pH indicators & are yellow in acidic condition. V. cholera & V. alginolyticus also produce yellow colonies. V. parahaemolyticus is a sucrose non-fermenting organism and therefore produces blue-green colonies, as does V. vulnificus . A few strains of V. cholerae may appear green or colourless on TCBS Agar due to delayed sucrose fermentation.
The green algae include unicellular and colonial flagellates, most with two flagella per cell, as well as various colonial, coccoid and filamentous forms, and macroscopic, multicellular seaweeds. There are about 8,000 species of green algae.
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