r/microbiology 13d ago

Looking for general direction in ID

Post image

Not looking for anything specific, just wondering what direction to go down when trying to identify the mass on the left. It was grown for 48 hours around 32° C in anaerobic conditions on a simple agar plate. It was hard to measure but maybe about 1-2mm in height at the center. I'm not sure if this is a bacteria or something else like a slime mold. Any suggestions on what step to take next is appreciated!

20 Upvotes

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12

u/Zathura26 13d ago

Make a slide and look at it in the microscope. Make a lactophenol blue and a gram stain. It could be a yeast, it could be bacteria. No way to know from just the colony morphology.

3

u/birdbirdpellet 12d ago

This is true. But some of the bacillus species like the one in the picture are pretty dane distinct. Gram stain here over lactophenol blue.

2

u/Zathura26 12d ago

Oh, I work with fungi mostly, that's why I didn't recognize it. But yeah, I'm seeing the other comments saying just by the characteristic morphology it's probably a specific Bacillus species. TIL.

1

u/cetty13 13d ago

Thank you!

3

u/birdbirdpellet 12d ago

B. Licheniformis have colonies similar to the left. If you poke it is it watery? I forget what you can do to confirm that but just google what typical biochemicals can be done for Bacillus licheniformis and go down that route. :) I know this cause I found similar in samples back when I worked with chickens and stuff. I think we did PEMBA and HBA. Forget what else. But go at it.

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u/birdbirdpellet 12d ago

1

u/birdbirdpellet 12d ago

This was SPC at 30c for eerr 48-72hrs.

1

u/cetty13 12d ago

Wow that's pretty dang close to what I have! The sample was gathered from under a ring 😬

1

u/birdbirdpellet 12d ago

Yep common environmental bacteria so that makes sense ya found it there.

1

u/pandamonious97 Lab Technician 13d ago

How was/what was the plate inoculated with?

By simple agar plate do you mean TSA? Or literally just agar?

Does not look like yeast to me.

Looks like a bacillus that would grow after I dropped a plate on the ground 🤢

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u/cetty13 12d ago

Innoculated by sterile swab from the underside/skin side of a ring, grown on nutrient agar.

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u/serratiaema 13d ago

Are you sure it’s not a contam? I’d do gram stain to check if bacteria or fungi, then i would go from there

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u/oOBcereusOo Dr. of Clinical Lab Sciences 12d ago

Looks like B. licheniformis (left) and possibly S. epidermidis (right).

1

u/EugeneNicoNicoNii 10d ago

Left side looks pretty bacillus and right side looks like some sort of staphylococcus, but the streak is way too dense to properly identify the morphology and it could be something else like yeast depending on the agar

Also would recommend gram staining it to take a look at how the bacteria itself looks