7.1 Bacterial Basics Flashcards
What color do G+/G- stain?
G+ blue/purple (positive=purple)
G- pink
Describe the cell structure of G+
Cellular membrane
Cellular envelope
THICK CELL wall, made from peptidoglycan (NAG/NAM)
Describe the cell structure of G-
Cellular membrane
Cellular envelope
Thin cell wall, made from peptidoglycan
OUTER MEMBRANE- has porins, made of lipopolysaccharide, toxic to HBs
How are peptidoglycan organized?
NAG/NAM- polymers cross-linked with Penicillin-binding proteins (PBPs)
What are the G+ bacilli?
Coronybacterium
Clostridium difficile
Listeria
Bacillus
How are G+ cocci subdivided?
Catalase +/-
What are the catalase + G+ bugs?
Staphylococcus
S. aureus (Coagulase +; fibrinogen-> fibrin)
S. epidermitis
S. saphrophyticus
What are the catalase- G+ bugs?
Streptococcus
What do alpha, beta, gamma hemolytic mean?
B- (clear) lyses RBCs
A- (green) oxidizes Fe+
G- No change to agar
What are the beta hemolytic streptococci?
Pyrogenes- bacitracin sensitive
What are the gamma hemolytic streptococci?
Enterococcus
E. faecalis
E. fecium
What are the alpha hemolytic streptococci?
Strep. pneumoniae
Strep. viridians
What are the G- cocci?
Neisseria
Meningitis/ghonorrhea
What are the G+ coccobacilli?
H. influenzea
B. pertussis
L. pneumoniae
How are G- bacilli subdivided?
Lactose +/-
