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Litmus

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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Need URGENT help identifying unkown bacteria!

... A red slant and yellow on the bottom Growth + Gas production + Multiple sugar fermentation - (Only showed glucose) Hydrogen Sulfide - (No black) Litmus MilkWas unsure of this, it was white in the whole test tube except for like half an inch space at the top where it was a purple color, similar ...

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by graymonkey44
Tue Aug 02, 2011 1:35 pm
 
Forum: Microbiology
Topic: Need URGENT help identifying unkown bacteria!
Replies: 1
Views: 374

HELP! Identification of unknown gram-positive bacterium!?

... colonies- Effuse Acid-fast (-) Catalase (+) Phenylalanine deominase (-) Urea (-) Citrate (-) Gin's stain (-) Methyl red (-) Voges-proskauer (-) Litmus milk- Alkaline (Incubated 5 days) Starch (-) Nutrient agar plate- Circular, flat, entire, amorphious, mucoid Oxidase (-) Casein hydrolysis (-) ...

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by MGremillion
Fri Apr 01, 2011 9:24 pm
 
Forum: Microbiology
Topic: HELP! Identification of unknown gram-positive bacterium!?
Replies: 3
Views: 712

Unknown bacteria

... Glucose + Lactose + Mannitol + Mehtyl Red + VP test + Catalase - Starch - casein - fat hydrolysis + urea - kligers iron - citrate- phenylalanine - litmus milk- acid reaction What can this be please please help

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by Hmicro
Mon Nov 23, 2009 12:39 am
 
Forum: Microbiology
Topic: Unknown bacteria
Replies: 12
Views: 2563

Needing help identifying uknowns for micro lab

Tests 7A 7B SIM black/pur negative Gram negative negative Rod 2x1 3 to 4x1 Motile non pos PR lactose pos negative PR glucose pos pos Litmus alkaline didn't test FTM facultative aerobic Catalase negative negative MR pos pos VP pos Starch negative hydrolysis Amylase negative pos TSI yby ry ...

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by avon7774
Wed Jul 29, 2009 10:35 pm
 
Forum: Microbiology
Topic: Needing help identifying uknowns for micro lab
Replies: 1
Views: 1618

Stomach bloating and weight gain

... juice cravings I have been having whenever I want to eat (providing an acidic environment at the time of the meal). The thought of swallowing a ph litmus paper and throwing it back up doesn't thrill me. Wonder how I could check the pH of my stomach. A question for my doctor friend.

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by kolean
Thu Jul 23, 2009 2:57 pm
 
Forum: Physiology
Topic: Stomach bloating and weight gain
Replies: 411
Views: 1390556
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