June 2020 – Food Microbiology Academy

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Month: June 2020

3 Posts

Bacteria, Food quality, food spoilage

UHT processing and microbial spoilage of UHT milk.

June 28, 2020 — 1 Comment

Bacteria, Food safety

Microbiological safety of rice dumplings.

June 18, 2020 — 1 Comment

Food quality, Food safety, food spoilage

Safety of sodium benzoate (E211)

June 15, 2020 — 0 Comments

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A proteolytic Pseudomonas aeruginosa growing on a skim milk agar plate effects hydrolysis of the casein and whey proteins in the agar, resulting in dramatic clear zones.

Bacteriophage c2 is a lytic lactococcal phage. It's effects can be seen here as plaques on an otherwise confluent lawn culture of Lactococcus lactis.

On Mannitol Salt Agar, mannitol fermentation is indicated by yellow coloured colonies, such as what we have here. These mannitol fermenting Staphylococcus aureus were from a potato salad sample.

Here we've got Escherichia coli, that is labelled with DsRed-Express2, a the red fluorescent protein.

Colonies of Helicobacter pylori looking like stars in the night sky here on a modified horse blood agar medium.

The porcine respiratory pathogen, Actinobacillus pleuropneumoniae, on Chocolate agar.

Compare this photo with that from a couple of days ago. A different patient, but its a stool sample again on Hektoen enteric agar, with Plesiomonas shigelloides (blue/green colonies) indicated by the large arrow and the normal stool flora (brown/orange) indicated by the small arrow.

Escherichia coli O157:H7 on sorbitol MacConkey. Sorbitol replaces lactose and because E. coli O157:H7 cannot ferment sorbitol, unlike most other E. coli, this medium is selective for this serotype.

Plesiomonas shigelloides in green amongst normal stool flora, in orange, on Hektoen enteric agar.

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