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Lactococcus lactis
Lactococcus lactis Lactococcus lactis
Pinpoint, semi-transparent colonies. This culture has been incubated for 48 hours in a micro-aerobic atmosphere.
 
 
The same Blood Agar plate examined with transmitted light. Absence of 'greening' around the colonies is due to the production of pseudocatalase which prevents the accumulation of hydrogen peroxide.
General characteristics: Gram-positive cocci. Catalase-negative, but may show a catalase-positive reaction when grown on Blood Agar. Attacks sugars fermentatively and no gas is produced. Microaerophilic. Non-motile.
Microscopy:
© Department of Veterinary Disease Biology 2011
Faculty of Health and Medical Sciences - University of Copenhagen
Denmark