Microbiology Flashcards
hyaluronic acid significance
component of group A strep extracellular capsule; believed to play a role in virulence.
Only gram-positive that produces LPS
listeria
Periodic acid schiff stain use in microbio
Stains fungi
What does gram staining detect?
peptidoglycan, which is present in a thick layer in Gram-positive bacteria. The membrane is being stained.
How do Gram-negative bacteria appear?
Gram-negative stain with the counterstain (safranin or fuschine), giving Gram-negatives a RED or PINK coloring.
What do gram-positive retain?
Crystal violet dye.
What happens if you stain acid-fast bacteria?
Show up as if they are gram-positive, mostly because of thick cell wall.
How do gram positives appear on gram stain?
purplish-blue
What causes skin presentation in scarlet fever?
erythrogenic toxin
respiratory tract epithelia?
Everything is ciliated columnar except for the vocal folds (squamous) and epiglottis (squamous)
Respiratory papillomatosis
- caused by HPV types 6 and 11.
- warts form on the larynx or other areas of the respiratory tract causing dyspnea.
Respiratory papillomatosis histology
finger-shaped lesions with benign vascular core lined with BENIGN squamous epithelium
hemochromatosis gene
6
dysthymia
Mood disorder similar to depression but with less severe but *longer-lasting symptoms.
schizoaffective
Greater than 2 weeks of hallucinations or delusions WITHOUT major mood episodes + periods of concurrent major mood episodes with schizophrenic symptoms.
