P1 | Bacterial Morphology (LECTURE) Flashcards
Bacterial Morphology
___ to __ μm in width and __ to __ μm in length
(___-__ um - Mahon)
0.25 to 1 μm in width and 1 to 3 μm in length
(0.4-2 um - Mahon)
The staining procedure separates almost all medically relevant bacteria into two general types:
- Gram Positive
- Gram Negative
Common bacterial cellular morphologies:
(C.C.B.F.C.S)
- Cocci (circular)
- Coccobacilli (ovoid)
- bacillus (rod shaped)
- fusiform (pointed end)
- curved
- spiral shapes
Microscopic Shapes
- found in ocean sediment
- has a diameter of 0.1 to 0.3 mm.
Thiomargarita namibiensis
Microscopic Morphology of Bacteria
(COCCI)
(C.C.P.T)
- In clusters
- In chains
- In pairs
- In tetrads
Microscopic Morphology of Bacteria
(BACILLI)
(C.B.F.P)
- Coccobacilli
- Bacilli of various sizes (pleomorphism/pleomorphic bacteria)
- Fusiform bacilli
- Palisading (parallel)
Microscopic Morphology of Bacteria
(SPIROCHETES)
- round or spherical shaped bacteria.
- The resulting arrangement of cocci depends on the PLANE of DIVISION
Cocci (Coccus)
(DIPLOCOCCUS OR DIPLOCOCCI)
All diplococci appears to be two cocci adjacent to each other except:
- Neisseria spp.
- (Except: Neisseria weaveri and Neisseria elongata)
kidney or coffee bean shaped diplococci
Neisseria spp.
- (Except: Neisseria weaveri and Neisseria elongata)
Is Neisseria spp.
- (Except: Neisseria weaveri and Neisseria elongata) gram positive bacilli or gram negative bacilli?
Gram Negative Bacilli
flame/lancet shaped diplococci
(SP)
Streptococcus pneumoniae
Is Streptococcus pneumoniae a gram positive or gram negative?
Gram positive
What is the plane of division for “DIPLOCOCCUS/DIPLOCOCCI”?
Coccus is divided one (1) plane of division
COCCI IN CHAINS
Plane of division?
e.g Streptococcus spp.
Coccus is divided by one (1) plane of division but continuously dividing it.
Coccus in packets of four (4)?
Tetrad/s
What is the plane of division for “TETRAD/S”?
Coccus is divided two (2) planes of division.
Example of a Tetrad?
Micrococcus tetragena
Coccus in cubical packets of eight (8)?
Sarcina/e
What is the plane of division for “SARCINA/E”?
Coccus is divided three (3) planes of division in a regular pattern
Example of a Sarcina/e?
(M.L)
Micrococcus luteus
COCCI IN CLUSTERS
Plane of division?
e.g Staphylococcus aureus
Coccus is divided two (2) planes of division in a irregular pattern; grape-like clusters
rod shaped, cylindrical, or elongated bacteria
BACILLUS (BACILLI)
BACILLI MORPHOLOGY
rod shaped bacillus
Single Bacillus