(c) Costin Stoica
Antibiogram
Encyclopedia
Culture media
Biochemical tests
Stainings
Images
Movies
Articles
Identification
Software
R E G N U M
PROKARYOTAE
Previous page
Back
Biochemical Tests
Casein decomposition on Milk agar
(clear areas around colonies)
Christensen's urea agar positive
(left) and negative (right)
Clostridium perfringens curd formed
and disrupted by gas production
Coagulase test (Stahpylococcus
aureus
; both tubes are positive)
False-positive H2S production on
TSI medium (
Klebsiella oxytoca)
Hydrogen sulfide production testing
by lead acetate impreganted paper
positive (left) and negative (right)
Liquefaction of clotted horse serum.
Arcanobacterium pyogenes
proteolytic activity
Litmus milk test
negative (left) & positive (right)
Litmus milk test: pink discoloration,
curd production without gas:
Arcanobacterium pyogenes
Litmus milk test: pink discoloration,
gas production & curd disruption by
gas:
Escherichia coli
Lysine decarboxylase test,
negative (left) & positive (right)
Mannitol fermentation medium
negative (left) & positive (right)
Methylene blue decomposition test
positive (left) & negative (right)
Natrium  selenite, Salmonella
selective medium (positive tests)
ONPG test (beta-galactosidase)
positive (left) and negative (right)
Phenylalanine test, positive left,
negative right
Salmonella in Rappaport
-Vassiliadis medium : positive (left)
and negative (right)
TSI, MIU and Citrate (TMC) Multitest
system for Enterobacteriaceae
identification
Escherichia coli on TMC (Glu+,
Gas+, H2S-, Lac+, Motility-, Ind+,
Urea-, Cit-)
Proteus mirabilis on TMC (Glu+,
Gas+, H2S+, Lac-, Motility+, Ind-,
Urea+, Cit+)
Salmonella spp. on TMC (Glu+,
Gas+, H2S+, Lac-, Motility+, Ind-,
Urea-, Cit+)