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VT 260 - Microbiology
Week 2 Review
48
Veterinary Medicine
Undergraduate 4
04/16/2015

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Cards

Term
How quickly do we have to put the agar w/antibiotic disks into the incubator?
Definition
Within 15 minutes
Term
When you are doing a catalase test, what do you add to your specimen?
Definition
3% hydrogen peroxide (bubble, poistive, staph) (negative, strep)
Term
If you are performing a KOH what reagent do you add?
Definition
Potassium hydroxide
Term
The reagent used for the oxidase test is what?
Definition
1% tetramethol-p-pheneylenediamine
Term
The larger the MIC zone the lower the concentration of drug needed?
Definition
True
Term
The reagent needed for a coagulase test is what?
Definition
EDTA
Term
The temp of an incubator for normal culturing?
Definition
37 Celsius
Term
When scoting a CMT (california mastitis test) what does the symbol (t) refer to?
Definition
Trace
Term
At what point do you score an initial CMT?
Definition
10-15 seconds
Term
What is the objective of specimen collection?
Definition
Obtain the best sample that is representative of the bacteria type
Term
We have a draining tract what are they frequently contaminated with?
Definition
Bacteria and normal flora
Term
Your gram negative bacteria will stain what color? Gram positive?
Definition
Negative - pink/red   positive - purple
Term
You have a macconkey agar, it is a selective media, it grows bacteria in the presence of bile salts and crystal violet, what is this good for testing for?
Definition
enterobacteria
Term
What culture media is the best and most commonly used?
Definition
agar plate
Term
Why do we invert the agar plates in the incubator?
Definition
To keep the condensation off the agar
Term
What is the primary isolation media?
Definition
blood agar
Term
Enrichment broth is used to grow what?
Definition
Anerobic organisms
Term
You pull out your blood agar and you have delta hemolysis, this is commonly produced by what kind of bateria?
Definition
Staphylococcus
Term
Tiple sugar iron agar is used for the detection of what and what?
Definition
glucose fermentation and bacteria that produce hydrogen sulfide
Term
How do you create an oxygen free environment
Definition
put a candle in a jar with the lid on which creates a carbon dioxide environment
Term
on a macconkey agar you see a large, profuse growth, it is presumptive evidence of what organism?
Definition
gram negative
Term
your urea tubes turn what color when positive
Definition
positive - pink
negative - orange/yellow
Term
before you use blood culture you use thyoglycolade broth to grow what?
Definition
blood
Term
how many mL do you need for a blood culture?
Definition
10-15
Term
While making a preliminary evaluation of primary cultures what must you keep in mind?
Definition
Where did it come from
Term
Nosocomial infections come from where?
Definition
Hospital setting
Term
What do i see that proves it's a positive motility test?
Definition
color throughout the entire tube not just the stab line
Term
what is it called when you are identifying microbes
Definition
isolating
Term
what type of organisms do we not isolate
Definition
zoonotic diseases (anthrax, plague, TB, etc)
Term
True or False - All viruses are free living?
Definition
false - they need a host cell to replicate
Term
diplococcus means what?
Definition
it grows in pairs
Term
How does bacteria replicate/reproduce?
Definition
binary fission
Term
on your blood agar you see green growth what type of hemolysis is this?
Definition
alpha hemolysis
Term
complete hemolysis is also called what?
Definition
beta hemolysis
Term
no hemolysis is called what?
Definition
gamma hemolysis
Term
If you use crystal violet, iodine, and saphron what is the name of that staining?
Definition
gram staining
Term
bacteria require what pH range?
Definition
6.5 - 7.5
Term
know what a quality incubator needs?
Definition
heat source, insulation, racks, tight door, etc
Term
brucella cateus need what type of culture
Definition
blood culture
Term
you have a gram neg bacilli it is an aerobe and is oxidase positive - what might it be?
Definition
pseudomonas
Term
you have a gram positive cocci that is catalase positive and coagulase positive what is it?
Definition
staphylococcus areus
Term
gram positive baccili it has spores but non hemolytic, what is it?
Definition
bacilis anthraxis
Term
what does NCCLS stand for?
Definition
National Committee for Clinical Laboratory Standards
Term
What are the three catagories of spores?
Definition
central, subterminal, and terminal
Term
Know the gram stain in order
Definition
crystal violet, rinse, iodine, rinse, decolorizer, rinse, saphron, rinse
Term
What is the goal for streaking plates?
Definition
Grow individual colonies, spread them out
Term
What type of organisms grow best at low temperatures?
Definition
psychrophiles
Term
what type of organisms grow best at high temperatures?
Definition
thermophiles
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