COLONIAL MORPHOLOGY Flashcards
QUALI OR QUANTI
what type of isolation is used for urine culture?
quantitative
because you do COLONY COUNTING
T/F:
Hemolysis can be seen on both Blood Agar and Choco Agar plates
False
BAP only. Choco agar RBC are already lysed while heating
Enumerate:
3 types of hemolysis in BAP
- alpha
- beta
- gamma
hemolysis
partial; greenish zone
alpha hemolysis
example: S. pneumoniae
hemolysis
complete; clear zone
beta hemolysis
examples: S. pyogenes, S. aureus
hemolysis
no hemolysis
gamma hemolysis
example: E. faecalis
Score of a plate with colonies visible only in quadrant 1, with fewer than 10 colonies?
1+
score of a plate with colonies visible in quadrants 1 and 2, with more than 10 colonies in quadrant 1 and fewer than 10 in quadrant 2?
2+
If colonies are present in quadrants 1, 2, and 3, and more than 10 colonies are observed in quadrants 1 and 2 but fewer than 10 in quadrant 3, what is the score?
3+
A plate shows colony growth in all four quadrants, with more than 10 colonies in each quadrant, what is the score?
4+
Give an example of Double Zone of Hemolysis
C. perfringens
enumerate
sizes of colonical morphology (3)
- pinhead
- pinpoint
- large, medium
sizes
typical of staphylococci
pinhead
sizes
typical of streptococci
pinpoint
sizes
tend to be G(-) bacilli
large, medium
enumerate
colony shapes
- punctiform (pinpoint)
- circular
- filamentous
- irregular
- rhizoid
- curled
enumerate
elevation
- flat
- raised
- convex (dome)
- umbilicate
- umbonate
enumerate
margins
- entire
- undulate
- filamentous
- lobate
- erose
- curled
- scalloped
dry, wrinkled, breadcrumb-like
Nocardia spp.
hammered copper
Yersinia pestis
aka plague bacilli
identify
what bacteria shows a green, pearlescent appearance on a BAP?
P. aeruginosa
Enumerate
pigments produced by Pseudomonas (4)
- pyoverdine
- pyocyanin
- pyorubin
- pyomelanin
color
pyoverdine
green
though **yellow-green **yung sabi ni pubmed
color
pyocyanin
blue
color
pyorubin
red
red-brown sabi ni pubmed
color
pyomelanin
black/brown
Pedicle/footlike
Candida albicans
this is not a bacteria, it’s YEAST
Density of a colony can be: (3)
- transparent
- translucent
- opaque
to see diff densities, look through the colony while using transillumination
This bacteria produces semi-opaque colonies, with organisms concentrated at the center
sometimes called “bull’s eye”
Streptococcus agalactiae