MLSP: Microbiology Flashcards
Allow room air to pass into
cabinet and around the area and
material within, sterilizing only the
air to be exhausted
CLASS I
Consist of negative pressure and operated in open front
CLASS I
Air flows in “sheets”, which serves
as a barrier to particle from outside
the cabinet
CLASS II CLASS II
Direct the flow of contaminated
air into the filters, also called as VERTICAL LAMINAR FLOW BSCs
CLASS II
Self-contained, and 70% of the air
is recirculated [most common in
clinical microbiology section]
CLASS IIA
Selected for radioisotopes, toxic
chemicals or carcinogenic samples
CLASS IIB
Prokaryotic unicellular organisms that lack a true nucleus and nuclear membrane
BACTERIA
Single, closed, circular chromosomes of double-
stranded DNA called?
NUCLEOID
small circular molecules o
extrachromosomal circular DNA
PLASMIDS
May either be GRAM POSITIVE [violet] or GRAM
NEGATIVE [pink or reddish pink]
BACTERIA
asexual reproduction of bacteria
BINARY FISSION
range from 0.2 to 2um in diameter
and 1 to 6um in length
Bacteria size
Principal stain used for microscopic examination of bacteria
GRAM STAIN
T or F
Gram stain is first devised by Hans Christian Gram during the late 19th century
True
take up the basic dye, crystal violet
Gram-positive
allow crystal violet dye to wash out easily with decolorizer alcohol or acetone
Gram-negative
CELL WALL
Thick (peptidoglycan)
Gram positive
CELL WALL
Thin (peptidoglycan)
Gram negative
LIPOPOLYSACCHARIDE
Absence
Gram positive
LIPOPOLYSACCHARIDE
Presence
Gram negative
GRAM STAINING
Purple
Gram positive
GRAM STAINING
Red or Pink
Gram negative