Term
1. What is the Gelatin Test looking for?
2. What indicates a positive vs negative test?
3. What microbe demonstrates a positive test? |
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Definition
1. It is looking for the presence of proteases
2. A positive test = Liquefied Medium Negative = solid medium.
3. Pseudomonas aeruginosa |
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Term
1. The Phenol Red Broth Test is used to differentiate what?
2. What indicates positive for presence of acid, and negative for presence of acid?
3. What mediums were used with the Phenol Red?
4. Two Examples are? |
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Definition
1. Phenol Red is a pH indicator and differentiates between which
organisms produce acid vs non-acid and gas vs non-gas by-products
of fermentation
2. Yellow = Acidic Red = No Fermentation taken place Pink = Alkaline due to peptone degradation) Bubble = Gas Present (C02)
3. Lactose, Sucrose, and Glucose
4. Enterococcus faecalis: all 3 yellow tubes with no gas
E. Coli: Sucrose > red w/ no gas
Lactose > yellow w/ gas
Glucose > yellow w/ gas |
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Term
1. Starch Agar Plate tests for what? 2. What indicates a positive vs a negative test? |
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Definition
1. It tests for the presence of Amylase via Starch Hydrolysis 2. Iodine is added to the Starch Agar. If Starch his present, it complexes with the Iodine and turns dark brown/black. T Black = Negative for Amylase Clearing = Positive for Amylase |
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Term
1. Milk Agar Plate tests for the presence of what? 2. What indicates a positive vs a negative result? |
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Definition
1. Tests for the presence of a protease called casease.
2. Positive = clearing / halo in gar
Negative = no clearing or halo |
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Term
- Spirit Blue Agar test, tests for the presence of what?
- What indicates a positive vs negative test?
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Definition
- Spirit blue tests for the presence of Lipases
- Postive = A clearing in the blue agar indicates Negative = No clearing, all blue.
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Term
Which organism is good at all three tests: Spirit Blue Agar, Starch Agar , Milk Agar
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Definition
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Term
- What is a Quadrant Streak?
- What is it's purpose?
- What two organisms did we use for this?
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Definition
- A quadrant streak is when you streak 1 quadrant and then spread it out through all 4 quadrants on a agar plate
- To promote and demonstrate greater separation of colonies - look for separation
- Serratia and E. Coli
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Term
- What is the radiant streak?
- What did we use to inoculate?
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Definition
- A radiant streak is when you streak across one quadrant, and then creat 3 - 4 additional perpendicular linear streaks from the origin streak
2. Saliva
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Term
What does MaConkey Agar test for?
What are do the color changes indicate? |
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Definition
MaConkey Agar tests for Enterics, and separates them into 2 groups - Lactose fermenters and non lactose fermenters.
Lactose Fermenters = Pink, red, purple colonies
Non Lactose Fermenter = Tan / Colorless Colonies
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Term
Which organisms are good Lactose Fermenters? |
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Definition
E. Coli , Enterobacter, Klebsiella |
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Term
Which organisms are non lactose fermenters? |
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Definition
Proteus vulgaris, Salmonella, Shigella, Pseudomonas |
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Term
What does Mannitol Salt Agar Test look for?
What are it's indications for positive and negative? |
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Definition
Mannitol Salt Agar tests for Staphylococcus Aureus specifically.
Positive = Yellow colony or halo
Negative = Red or No Growth
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Term
Triple Sugar Iron Agar (TSI) What does is it test for?
What are the active indicators?
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Definition
Designed to differentiate bacteria on the basis of glucose, sucrose, and lactose fermentation and sulfur reduction.
Phenol Red is the pH indicator and the Iron in the ferrous sulfate is the Hydrogen Sulfide indicator. |
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Term
In a TSI test, what does a red slant and yellow but indicate? |
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Definition
A red slant and yellow butt indicates that the organism ferments glucose but not lactose.
Inoculated with a glucose only fermenter, acid by-products lower pH and turn medium yellow.
After a few hours since glucose low concentration, it will be exhausted and alakaline reversion takes place, and NH3 production turns the slant more alkaline. |
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Term
In a TSI test, what does a yellow slant and yellow butt indicate?
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Definition
Acidic slant and butt
Yellow Slant and Yellow butt indicates that the organism is able to ferment Glucose and Lactuse and/or Sucrose and turn the medium yellow through out. |
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Term
In a TSI test, what does a yellow or reds slant with a black butt indicate? |
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Definition
red slant = glucose fermenation
yellow slant = glucose and lactose fermentation
Black = Hydrogen Sulfide |
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Term
Methyl Red - Voges Proskauer Tests , what does this IMViC test for?
What are the indications of a positive and negative for each?
What are the indicator reactants used? |
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Definition
Methyl Red tests for mixed acid fermentation and lowers overall pH.
MR test: Postive = Red Yellow = Negative
Voges Proskauer Tests for organims that ferments glucose produces acid and then quickly convert it to acetoin and butanediol.
VP test: Red = Positive Copper = Negative
Reactants used were: Methyl Red for MR test and Reagents A & B for VP |
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Term
Simmons Citrate Test is used to test for the presence of what?
What indicates a positive vs a negative? |
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Definition
It is used to test for the utilization of Citrate as an organisms sole source of Carbon. (Citrate Permease Enzyme)
Positive = Blue
Negative = Green |
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Term
Urea Broth Tests, tests for the presence of what?
What indicates a positive vs negative result? |
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Definition
It tests for the presence of Urease, which is an enzyme that breaks down Urea.
Pink = Positive for presence of Urease
Yellow = Negative for absence Urease
classic positive = Proteus vulgaris |
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Term
What does SIM medium test for? |
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Definition
SIM medium tests for 3 things: Sulfur Reduction, indole production, and motility
Sulfur Reduction: results in Hydrogen Sulfide Production
Black = Positive for Hydrogen Sulfide
Yellow = Negative
Indole Production:
Red Layer: positive for indole production
Clear Layer: negative for indole production
Motility:
If organisms are spaced and cloudy - positive for motility |
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Term
What does the Catalase Test differentiate? |
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Definition
Differentiates if an organism contains catalase or not, which breaks down Hydrogen Peroxide and results in a fizzing.
All Staphylococcus = Catalse Positive
All Streptococcus = Catalse Negative |
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Term
Blood Agars test for what?
What are the two types of Hemolysis? |
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Definition
They differentiate between some gram positives and their ability to break down RBC's via Hemolysins.
Alpha Hemolysis = incomplete lysis and results in a green appearance aroudn the colonys and not much clearing.
Beta Hemolysis = complete lysis of RBC = complete clearing around the growth as a result of complete lysis of RBCs. |
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Term
Coagulase Test is what type of test? |
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Definition
An Agglutination test similar to Blood Typing
It is Staph Aureus Positive ONLY! |
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Term
Bacitration is used to ID what organism? Why? |
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Definition
S. Pyogenes because it's sensitve to Bacitration and will not grow near it. |
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Term
Bile Esculin Agar tests for what?
What indicates a positive vs negative result? |
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Definition
Bile Esculin tests for Group D Enterics - Enterococcus
Black = Positive
No color change = Negative |
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Term
What tests test with Gram Positive Organisms? |
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Definition
Blood Agar, Mannitol Salt, Mitis, Catalase Tests use Gram Positive |
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