-
this type of media grows most non-fastidious organisms with no advantage given to a particular organism.
supportive/general
-
this type of media is enriched for fastidious organisms.
enrichment
-
this type of media is inhubitory.
selective
-
this type of media is used as a visual aid.
differential
-
this type of media is confirmatory ID for previously isolated organisms.
Biochemical
-
this is an examle of a media that is supportive and also differential
BAP
-
this is an example of a media that is selective and also differential
MAC
-
this is the process of taking bacteria from a site and growing it in a culture.
cultivation
-
these two bacteria cannot be grown in vitro.
-
what three things are needed to sustain microbial metabolism?
-
this type of water is recommended to avoid impurities in re-hydrated powder media.
purified water
-
this is the original solidifying agent.
gelatin
-
this is the most common solidifying agent
agarose
-
agarose dissolves at what temperature?
>95oC
-
agarose re-solidifies at what temperature?
<50oC
-
how much agarose should be used in solid media?
1-2%
-
how much agarose should be used in semi-solid media?
0.1-0.5%
-
how much agarose should be used in liquid media?
0.075%
-
in a THIO broth what is the purpose of agarose?
- prevents convection
- prevents penetration of O2
-
there are partially digested protiens which function as the principal source of organic nitrogen.
peptones
-
this is a peptone used in basic media
trypticase
-
this is the preferred type of whole blood because it has the correct hemolytic reaction
sheep's blood
-
human blood is limited for the use of what organism?
G. vaginalis
-
what are the two selective media that horse blood is limited to?
-
why is hemolyzed blood used?
increases availability of RBC-bound growth
-
what are the three meat and tissue infusions that are used in media?
-
this provides a carbohydrate additive and a carbon source
energy substrate
-
this helps to maintain the isotonic or physiological pH of the cell wall
sodium chloride
-
at what percentage is sodium chloide inhibitory
5%
-
this helps to maintain H ion concentration.
buffer system
-
this is used as an endpoint to ID organisms.
pH
-
these help to visually detect pH changes based on bacterial action
colormetric indicators
-
what are the colors for phenol red colormetric indicator?
- acid = yellow
- alkaline = red
-
what are the colors for methyl red colormetric indicators?
- acid = red
- alkaline = yellow
-
what are the colors for the neutral red indicator?
- acid = red
- alkaline = yellow
-
what are the colors for the bromcresol purple colormetric indicator?
- acid = yellow
- alkaline = purple
-
what are the colors for the ortho-toluidine blue colormetric indicator?
- acid = red
- alkaline = blue
-
what are the colors for the bromthymol blue colormetric indicator?
- acid = yellow
- alkaline = blue
-
what is the sulfur source for the formation of H2S gas?
sodium thiosulfate
-
what is the positive endpoint of an H2S indicator?
black percipitate
-
this promote growth of certain groups of organisms
selective agents
-
this retards growth of certain groups of organisms
inhibitory agents
-
these two terms regarding culture growth are used interchangeably
- selective agents
- inhibitory agents
-
what three dyes are used as GP inhibitors?
- crystal violet
- brilliant green
- basic fuchsin
-
what is the dye used in the MAC plate?
crystal violet
-
what is the dye used in the SS and BS plates?
brilliant green
-
what organisms are inhibited by brilliant green?
-
this is used in enteric media to inhibit GNC and GP organisms.
bile salts
-
what percent of sodium chloride is inhibitory for all organisms except streptococcus and staphylococcus?
6.5%
-
what percent of sodium chloride is inhibitory for all organisms excep staphylococcus?
7.5%
-
this inhibits all organisms except salmonella and vibrio
sodium selenite
-
what antibiotic is used to inhibit garm positive organisms?
vancomycin
-
what two antibiotics are used to inhibit gram negative organism?
-
what antibiotic is used to inhibit yeast
nystatin
-
this media has peptones and is used in susceptibility testing for both fastidious and nonfastidious organisms.
trypticase soy ager (TSA)
-
this media has peptones and glucose and is used to speed bacterial growth rate.
trypticase soy broth (TSB)
-
This media has beef infusion and starch and used for susceptibility testing and mainttenance.
mueller hinton ager (MH)
-
this media has calf brain, beef heart, peptones and glucose, and is used for quality control.
Brain Heart Infusion Ager (BHIA)
-
this media is used to accelerate growth to log rate in 6-8 hours. It is the blood culture media base.
Brain-Heart Infusion Broth (BHIB)
-
this media contains thioglycolic acid and is used to prevent the formation oand accumulation of toxic H2O2.
Thioglycollate Medium (THIO)
-
in THIO pink coloration seen in the uppermost portion of the medium is caused by what?
Resazurin
-
what is the O2 indicator in Thioglycollate Medium?
Resazurin
-
this is the most frequently used broth in micro.
THIO
-
what are three indications for THIO?
- wound culture
- culture of small surgical hardware
- visual evaluation of organism's atmospheric need for O2
-
this media consists of TSA, brucella, BHI, and is enriched with 5% defibrinated sheeps blood.
Blood Agar Plate (BAP)
-
this plate is used in the differentiation of hemolysis
BAP
-
this is partial hemolysis, green zone visible due to presence of biliverdin.
Alpha Hemolysis
-
this is complete hemolysis, there is a visible clear zone.
beta hemolysis
-
this is when there is no hemolysis
Gamma hemolysis
-
how are hemolytic reactions enhanced in Blood Ager Media?
stabbing
-
streptolysin-O is ______ labile.
oxygen
-
this plate has 2% hemoglobin or isovitalex and 5% hemolyzed sheeps RBC's
Chocolate agar plate
-
this plate cultivates fastidious organisms needing NAD/Hemin within RBC (Neisseria, Haemophilus).
Chocolate Agar Plate (CHOC)
-
this media is selective for N. gonorrhoeae and N. meningitidis.
Thayer Martin (TM)
-
this media is more selective than TM when working with mixed flora.
Modified Thayer Martin (MTM)
-
what is added to TM plates to inhibit proteus?
Trimethoprim
-
this is selective for N. Gonorrhoeae only.
New York Cityh Agar
-
the constituents of this plate is peptones, cornstarch, 3% HgB, horse plasma, and antibiotics
New York City Agar
-
what three antibiotics are added to Thayer Martin media?
- Vancomycin
- Colistin
- Nystatin
-
This is a gram positive selective media that has 7.5% NaCl.
Mannitol Salt Agar (MSA)
-
what is the pH indicator in MSA?
phenol red
-
what media is used as selective for staphylococcus?
Mannitol Salt Agar
-
this media is 95% positive for S. aureus.
MSA
-
This media is enriched with 5% sheeps blood and selective for GP organisms
Columbia CNA Agar
-
this media separates GP organisms from swarming enteric bacteria (e.g. proteus).
Columbia CNA agar
-
what is the biochemical agent in MAC?
lactose
-
what is the pH indicator in MAC?
neutral red
-
what are the two inhibitors in MAC?
-
on an MAC plate strong lactose fermenters leave a zone of percipitated bile that turns what color?
pink/red
-
MacConkey Agar is selective for what organisms?
GN
-
this media is enriched with a yeast extract and is used for the recovery of salmonella and shigella from stool samples.
Hektoen-Enteric Agar (HE)
-
what are the two pH indicators in HE?
- bromthymol blue
- acid fuchsin
-
what is the H2S indicator in Hektoen-Enteric Agar?
ferric ammonium citrate
-
what inhibitor is used in Hektoen-Enteric Agar?
bile salts
-
HE is selective for Gram _______ organisms.
negative
-
what colors are fermenters on an HE plate?
yellow/orange
-
what color do nonfermenters turn on an HE plate?
-
on an HE plate strong fermenters leave a zone of percipitated bile that is what color?
orange
-
what is the pH indicator on the salmonella-shigella Agar?
neutral red
-
what biochemical agent do MAC, HE, and SS share?
lactose
-
what is the H2S indicator on Salmonella-Shigella Agar?
Ferric Citrate
-
what are the three inhibitors on the Salmonella-Shigella Agar?
- Bile Salts
- Brilliant Green
- Sodium Citrate
-
what is the H2S indicator on Xylose-Lysine-Desoxycholate Agar (XLD)?
ferric ammonium citrate
-
this media is used for the isolation of salmonella and shigella from other GNR.
XLD
-
what color are fermenters and nonfermenters on XLD?
- fermenters are yellow
- nonfermenters are colorless, red
-
this broth temporarily inhibits normal flora for the isolation of salmonella and shigella.
GN broth
-
after 6-8 hours of GN broth sample should be subcultured to what three media?
-
gram negative enteric media differentiates what?
fermenters from non-fermenters
-
this semi-solid media differentiates by utilizing or not utilizing carbohydrates.
oxidative-fermentative (O-F) basal medium
-
What is the pH indicator on O-F?
bromthymol blue
-
what are the steps to inoculate O-F tubes?
- lightly stab 2 tubes 5x
- add carbohydrate disks aseptically
- overlay one tube with mineral oil, the other stays open
- incubate at 35-37oC
-
in an O-F tube what interpretation is based on the production of what?
Acid (yellow)
-
in O-F if acid is produced ony in the open tube the result is:
oxidative
-
in O-F if acid is produced in both tubes the result is:
fermentative
-
in O-F if acid is produced in neither tube the result is:
non-saccharolytic
-
this is a semi-solid medium with a cystine biochemical that is used to differentiate neisseria species.
cystine-trypticase agar (CTA)
-
what is the pH indicator in CTA?
phenol red
-
this agar has a biochemical of deoxyribonucleic acid at 0.2%.
Dnase Agar
-
what is the indicator in Dnase agar?
ortho-toluidine blue
-
the purpose of this media is to detect bacterial DNase production
DNase agar
-
Dnase agar is ___ positive for S. aureus.
99%
-
DNase is ___ positive for S. marcescens.
97%
-
what is the appearance of a positive result on DNase?
rose pink
-
what is the media protocol for throat cultures?
BAP
-
what is the media protocol for nasopharyngeal cultures?
-
what is the media protocol for sputum?
-
what is the media protocol for urine?
-
what is the media protocol for wound cultures?
-
what is the media protocol for stool?
-
what is the media protocol for genital cultures?
-
what is the media protocol for CSF?
- CHOC
- BLOOD CULTURE BOTTLE/THIO
-
what size glassware is used to prepare media?
twice as large
-
unprepared media is extremely __________.
hygroscopic
-
small loads should be sterilized at what temp? for how long?
-
large loads should be sterilized at what temp? for how long?
-
at what temperature do you add blood to the mdium for CHOC?
75-80oC
-
at what temperature do you add enrichments including whole blood?
45-50oC
-
at what temperature should the medium be poured into a petri dish?
50-55oC
-
how do you eliminate bubbles in a medium?
pass flame on surface
-
how do you eliminate condensation on a petri dish?
lid ajar for 15-20 min
-
how much medium should be used to achieve a 3mm depth in a 100 mm petri dish?
20mL
-
how much medium should be used to achieve a 5-6mm depth in a 150mm petri dish?
-
what is the shelf life of media?
2 weeks to four mounths
-
what type f media has a longer shelf life?
tubed
-
what percent of prepared plates should be tested for quality control?
5%
-
what is the ideal temperature for incuabtion?
35-37oC
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