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Butt log

Butt log

The log taken from the base of a tree; often slightly irregular.


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Conflicting results of Gram-Negative unknown

... so something is wrong RESULTS: Green growth with salmon-colored colonies 4. TSI agar *Negative for lactose fermentation RESULTS Red slant/Yellow butt No sulfer reduction 5. Urea slant *Conflicted about results; believed to be negative for urease production RESULTS: Color change in media from ...

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by Jrh21854
Sun Dec 01, 2013 8:25 pm
 
Forum: Microbiology
Topic: Conflicting results of Gram-Negative unknown
Replies: 0
Views: 2235

Gram Positive Cocci

... fat bacilli) or irregular clusters. Blood Agar: Gamma hemolytic EMB: Colorless growth (does not ferment lactose) MS Agar: No growth TSI: Yellow butt, yellow slant (ferments glucose, lactose and/or sucrose) (I am also wondering does this mean it does ferment lactose? Or can it mean that it ferments ...

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by lucrezia03
Wed Oct 17, 2012 11:58 pm
 
Forum: Microbiology
Topic: Gram Positive Cocci
Replies: 2
Views: 4198

What bacteria does this TSI test indicate?

Good job Sarah. It couldn't have been Proteus spp.. Red butt is consistent with Glucose fermentation - characteristic of enterics. Was it Shewanella (formerly Pseudomonas) putrefaciens? A common problem of most ID excercises is that they don't ask students ...

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by JorgeLobo
Sat Jun 09, 2012 11:44 am
 
Forum: Microbiology
Topic: What bacteria does this TSI test indicate?
Replies: 5
Views: 4002

What bacteria does this TSI test indicate?

... my TSI result. I couldn't find anything like it in the book or online. Any help and further explanation would really be appreciated :) TSI had red butt (alkaline) and black (H2s) on slant. There was no acid (or yellow) production. However, I've read online that the H2S can sometimes mask that so ...

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by SweetSarah
Mon Feb 27, 2012 5:46 am
 
Forum: Microbiology
Topic: What bacteria does this TSI test indicate?
Replies: 5
Views: 4002

Need help with my unknown organism?? Confusing test results

... any of the examples in my lab book nor could I find anything like this online. I'm not sure if I should redo it. My TSI slant has a red (alkaline) butt but has black on top, which I'm assuming is for H2S (hydrogen sulfide) production. But what confuses me is that there's no acid production in it ...

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by SweetSarah
Sun Feb 26, 2012 7:22 am
 
Forum: Microbiology
Topic: Need help with my unknown organism?? Confusing test results
Replies: 2
Views: 1536
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