Dictionary » L » Litmus



(Science: chemistry) a dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain colouring matters related to orcin and orcein.

litmus is used as a dye, and being turned red by acids and restored to its blue colour by alkalies, is a common indicator or test for acidity and alkalinity.

(Science: chemistry) litmus paper, unsized paper saturated with blue or red litmus, used in testing for acids or alkalies.

Origin: D. Lakmoes; lak lacker _ moes a thick preparation of fruit, pap, prob. Akin to E. Meat: cf. G. Lackmus. See lac a resinous substance.

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Help! "Unknown Bacteria" I have no idea where to look =T

... for Gelatin hydrolysis and to make matters worse it can return both results for casein hydrolysis as well. As far as direction to point you in, A litmus milk test would really be the ideal way to get an answer. Your SIM is most likely non-motile but don't count it out I have been told to look ...

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by Smaguss
Tue Dec 04, 2012 5:00 am
Forum: Microbiology
Topic: Help! "Unknown Bacteria" I have no idea where to look =T
Replies: 1
Views: 4050

Please Help Identify My Unkown Bacteria!!

... Bacillus shape (small rods) gram negative non spore forming not acid fast NEGATIVE for casein, starch hydrolysis Produces acid reaction with litmus milk Fermentaion of sucrose, glucose, lactose & mannitol. All with gas production Positive methyl red Neg Simmons Citrate (I did see a little ...

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by KingsMomi
Tue Jul 31, 2012 3:40 am
Forum: Microbiology
Topic: Please Help Identify My Unkown Bacteria!!
Replies: 2
Views: 5004

Help identifying a unkown

The litmus milk is pink..

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by Layd33foxx
Fri Apr 06, 2012 5:13 am
Forum: Microbiology
Topic: Help identifying a unkown
Replies: 2
Views: 2273

Help with unkown

... - no amylase casein hydrolysis - Lipase + tryptophanase + urea - cysteine desulfurase hydrogen sulfide production. Citrate - phenylalanase - litmus milk - Lysine decarboxylase - I think it's Shigella flexneri, but i would love a second opinion.

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by bruserboy1
Thu Apr 05, 2012 3:48 pm
Forum: Microbiology
Topic: Help with unkown
Replies: 0
Views: 1546

Indentifying an Unknown

... + Nitrate: + Starch: - Casein Hydrolysis: - Lipase: + Indole: - Urease: - Hydrogen Sulfide: - (but gas was produced) Citrate: + Phenylalanine: - Litmus: + Lysine: + Those are all of the results. I'm pretty positive it is an enterobacter. I just can't decide which species it is. I think E. intermedius.. ...

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by tkdgirl
Wed Apr 04, 2012 8:22 pm
Forum: Microbiology
Topic: Indentifying an Unknown
Replies: 0
Views: 1539
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