Bacterial Structure Flashcards
Gram + Cocci
Staphylococcus
Streptococcus
S. Aureus
Gram + Rods (Bacilli)
Clostridium Listeria Bacillus S. pneumonaie S. pyogenes S. agalactidae
Gram - Cocci
Neisseria meningitidis
N. gonorrhoeae
N. meningitidis
N. gonorrhoeae
Gram - Coccoid rods
Haemophilus influenzae
Bordetella pertussis
Gram - Rods
Klebsiella E. coli Shigella Salmonella Proteus Pseudomonas
Capsule is composed of what?
Why is it useful?
Polysaccharide
People are more susceptible to invasion and infection with encapsulated organisms
Spirochetes
helical shape, corkscrew motility
Ie: Treponema and barrelia
Chlamydia, Rickettsia
Obligate intracellular pathogens
Mycoplasma
No cell wall, can’t gram stain
Mycobacteria
Mycolic acid and lipoarabinomannan
Unique cell wall, must use ACID FAST stain
ACID FAST
used on waxy mycobacteria, done at high temperatures, show red and blue
Lag phase
produce proteins and prepare to accumulate
exponential growth phase
actively divide
stationary phase
bacteria use up nutrients as fast as they are made/acquired
death phase
too many bacteria for the environment, cant be sustained
selective media
inhibits growth of certain bacteria but allows growth of others
differential
doesnt inhibit growth, but has indicator to differentiate between bacteria
Blood agar test
Alpha- partial lysing via hemolysin, turns agar green
Beta- complete lysing of RBC via hemolysin
Gamma- no hemolysis
Bacillus arrangement
Rods
Streptococci arrangement
chains
Staphylococci arrangement
great white clusters
spirochete arrangement
corkscrew
how do pathogens enter
Aerosol, cuts in the skin, conjunctiva, mucous membranes etc
Gram stain colors
Gram - stains red
Gram + stains purple
