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Definition
Divide in a chain, one plane |
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Definition
Dividing into 2 planes
Square Rectangle |
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Definition
divide in 3 planes irregularly |
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Definition
divide in 3 plains regularly |
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Definition
Basic dye, positive Charge chromophore |
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Definition
Methylene Blue, Crystal Violet |
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Definition
acidic dyes, negatively charged chromophore |
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Definition
Acid fuschin, Congo Red, Nigrosin |
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Term
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Definition
no charge
Sudan Black stains granules of poly-B-OH-butyric acid |
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Term
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Definition
water insoluble
India Ink |
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Term
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Definition
Stains background, not cell
Nigrosin: (-) charge repels membrane of cell
India Ink: insoluble dye, does not penetrate cell |
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Term
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Definition
Dyes same cell all the same color
Can tell morhpology and size of cell
Common Dyes: methylene blue, and crystal violet |
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Term
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Definition
Causes cell to stain differently based on properties of cell
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Term
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Definition
Differential
Based on characteristic of cell wall
Crystal Violet, Mordant:Iodine, Decolorizer:Ethanol, Counterstain:Saffranin |
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Term
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Definition
Differential stain testing for high wax content of cells
Steam allows dye to penetrate cell
Primary Stain: Carbol Fuschn (red)
Steam
Decolorizer: Acid Alcohol (- test is colorless)
Counterstain: Methylene Blue (- test is blue) |
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Term
Acid Fast Organisms
(Acid Fast Positive) |
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Definition
Myrobacterium- if mature cell, because high wax content
if young cell, appear as gram+ tapered rod, sometimes fragment
Mycrobacterium: Tuberculosis and Leprae
Nocardia |
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Term
Spore Staining
Structural Stain |
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Definition
Must be steamed to allow dye (malachite green)to enter spore
Endospores appear as green center with pink sporangium
Free spores as small green oval bodies
Primary: Malachite Green
Steam
Decolorizer: Water
Counterstain: Safranin |
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Term
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Definition
Bacillus- Aerobic, gram + rod
Clostridium- Anaerobic, gram + rod
Sporsarcinae- Cocci |
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Term
Different Media Preperation |
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Definition
Pour= liquid agar--> pour plate
Broth= liquid media
Deep=media solidified in upright position
Slant= solidified at angled position
Fermentation Broth= broth with durham tube added |
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Term
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Definition
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Term
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Definition
Exact chemical composition known
Examples:
Selective Media- favors growth of one microorganism over another; inhibiting or providing nutrients
Differential Media- media distinguishing between different types of organisms based on apperance of growth or color changes |
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Term
Phenylethyl Alcohol Agar (PEA) |
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Definition
selects for growth of gram + microorganisms
PEA is inhibitory to the growth of gram (-) organisms |
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Term
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Definition
Selects for gram (-) microorganisms
Differentiates for lactose fermentors
Lactose fermentors produce acid, acid absorbs neutral red dye
Appearing Red
Non-fermentors do nor appear Red |
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Term
Eosin Methylene Blue (EMB) |
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Definition
Selects for gram (-) organisms
Differentiates lactose +/-
Lactose + shows color change
Lactose - no color change
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Term
EMB
Lactose + results, based on acid |
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Definition
Can further differentiate based on amounts of acid
Mixed Acid Fermentors produce more acid
colonies have dark blue-black centers
E.Coli- Metallic Green Sheen
Butanediol Fermentors produce less acid
colonies have pale pink to lavender centers |
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Term
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Definition
Differentiates organisms based on blood reaction
Gamma Hemolysis- None
Alpha Hemolysis- Partial hemolysis, partial clearing around colony; sometimes appear green
Beta Hemolysis- Complete blood hemolysis |
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Term
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Definition
Used to determine physiological characteristics of microorganism
Bacterial Enzymes and biooxidation |
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Term
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Definition
Tests for presence of Amylase--> hydrolyzes starch into simple sugar
Iodine added to plate and appears blue/black when interacting with starch
If amylase present, starch not present blue/black color not observed |
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Term
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Definition
Tests for presence of Caseinase
Hydrolyze Caseinase into amino acid product
Breakdown of caseinase causes agar to lose white coloring |
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Term
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Definition
Determining if microorganism can ferment particular sugars
Test Tubes contain: sugar (glucose, lactose, mannitol)
pH indicator (phenol red)
Durham tube
Fermentation= acid increase changing color from red to yellow
Durham tube= testing if gas produced during fermentation
Alkaline Reaction= darkening of red pH indicator color
Yellow= acid
Yellow + gas= Acid, gas
Red to Dark red= Neg. or Alkaline
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Term
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Definition
HCOOH--> CO2 + H2
Tests for Mixed acid Fermentor
Mixed Acid Fermentor produce large amounts of acid
Acid drops below 5.1
When methyl red added, stays red
E. Coli = MR+ |
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Term
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Definition
HCOOH--> Acetyl methyl carbinol (AMC)--> 2,3 butanediol
Tests for 2,3 butanediol fermentor
2,3 butanediol fermentor produce less acid than mixed
AMC= acetoin is tested
VP1= Barrit's reagent, intensify possible red color
VP2= KOH, reacts with AMC to produce brick red color
Enterobacteria= VP+ |
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Term
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Definition
2H2O2--> 2H2O and O2
Hydrogen peroxide toxic (produced in oxygen utilization), Catalase converts H2O2 into water and oxygen
Look for oxygen bubbles produced |
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Term
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Definition
Oxidase can oxidize aromatic amines to form colored products
Amine used to test is dimethyl-p-phenylenediamine hydrochloride
If dimethyl-p-phenylenediamine hydrochloride+oxidase= turns blue/ black color |
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Term
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Definition
NO3-+ 2e + 2H---> NO2 + H2O
NO2--> N2
Tests for ability to reduce nitrate
Reagents Nitrate I(Sulfanilic Acid
Nitrate II(dimethyl-alpha-naphthylamine)
NO2 present broth appears red--> Nitrate Positive
If not red, Zinc added to tube
Red after adding Zinc, Nitrate (-)
After Zinc added, if not Red
Nitrate (+) |
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Term
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Definition
Tryptophan--> Pyruvic Acid and Indole
Tests for tryptophanase
Indole tested by adding Kovac's Reagent
Kovac's Reagent= p-dimethylaminobenzaldehyde, amyl or butyl alcohol, and HCl
Kovacs appears in presence of indole product |
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Term
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Definition
Urea--> NH3 + CO2
Tests for Urease
Broth has urea and phenol red
As ammonia released pH rises, once above 8.1
Phenol Red appears Red
Red coloring= Urease +
Proteus= Urease (+) |
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Term
Hydrogen Sulfide Production (H2S) |
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Definition
Cysteine--> H2S+ Amino Acrylic Acid--> Imino Acid--> Pyruvic Acid + NH3
Tests for cysteine defulfurase
Black precipitate= positive test for H2S
Proteus= H2S positive |
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Term
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Definition
Tests for Sulfur, Indole, Motility
H2S Positive= Black precipitate
Indole Positive= Kovacs Reagent turning Red
Motility positive= growth away from inoculant |
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Term
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Definition
Tests for Ability to utalize citrate as sole carbon source
Microorganism can grow on media and turn it a deep Prussian Blue
Growth+ Blue Coloring= Positive Citrate organism |
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Term
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Definition
Phenylalanine--> Phenylpyruvic Acid (PPA) +NH3
Tests for presence of phynlalanase
To test for PPA, ferric chloride added to media
Ferric Chloride in PPA turns deep green
Deep green= positive |
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Term
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Definition
Test for Lactose fermentation, reduction of litmus, presence of caseinase, and the deamination of amino acids to produce NH3
pH indicator Litmus and powdered milk
Acid Reaction- Pink liquid due to drop in pH
Acid Curd- Pink solid acid production and coagulation of protein
Reduction- litmus reduced and turns white from milk
Alkaline Reaction- Blue liquid caused by protein breakdown
Proteolysis- Clearing of medium by caseinase |
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Term
Kliger's Iron Agar (KIA)
read 18 hours after inoculation (ideally) |
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Definition
Tests for fermentation of glucose/lactose, and production of H2S or gas
Fermentation= pH indicator
Glucose fermented= bottom yellow
Lactose fermented= all yellow
Black precipitate if H2S positive
Gas determined by slant movement |
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Term
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Definition
determining if bacteria can use glucose in aerobic or anerobic condition
2 test tubes innoculated
1 covered in mineral oil
contains pH idicator Brom Thymol Blue
§ Open Tube: Yellow, Closed Tube: Uninoculated color = Incompletely
Oxidative (O)
§ Open Tube: Yellow, Closed Tube: Yellow = Strictly Fermentation (F)
§ Open Tube: Uninoculated color, Closed Tube: Uninoculated color = Strictly Oxidative
§ Open Tube: Uninoculated color, Closed Tube: Yellow = Facultative |
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Term
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Definition
Indol, Methyl Red, Voge-Proskauer, Citrate
E.Coli = + + - -
E. aerogenes= - - + + |
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Term
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Definition
Test if bacteria are motile or not
Tetrazolium chloride, growth indicator |
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Term
Bismuth Sulfide Agar (BSA) |
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Definition
dull green color; Salmonella typhi produce black or very dark brown |
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Term
Brilliant Green Agar (BGA) |
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Definition
differential for lactose/ sucrose fermentation
lactose fermentig= yellow/green or yellow colonies
nonlactose= opaque red/pink/white colonies |
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Term
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Definition
Salmonella ususally produces black colony
Shigella a colorless colony
all lactose + colonies appear red |
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Term
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Definition
Selects for gram -, lactose - microorganism
some lactose + grow, but appear red |
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Term
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Definition
incubate in plasma tube
if plasma becomes clumpy/ solidifies= bacteria coagulase +
test only valid on gram + staphylococcus |
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Term
Phenol Red Manitol Salt Agar (MSA) |
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Definition
selects for staphylococcus due to high salt conc.
medium is red (phenol red), but plate colonies yellow if mannitol + |
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Term
Staphylococcus 110 Medium |
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Definition
contains mannitol and 7.5% NaCl, lacks phenol red
natural colony pigment |
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Term
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Definition
tests for exoenzyme DNase which hydrolyze DNA
Zones clear after addition of .1M HCl
Clearing= positive for DNase |
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Term
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Definition
10% NaCl selects staphylococcus, inhibits most others |
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Term
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Definition
selects for Gram -
Differential for lactose
lactose + = red colonies
Coliforms produce golden metallic golden sheen |
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