Actinobacteria: High G+C Gram-positive bacteria Flashcards
1
Q
Order Actinomycetales
A
- aerobe
- similar structures to fungi
- only asexual spores (no meiosis)
2
Q
What structures form Actinobacteria
A
- hyphae
- septa
- thallus
- conidia
- sporangia
- sporangiospore
3
Q
Genus Mycobacterium
A
- aerobe
- catalase +
- straight or curved rods
- grows slowly on solid media
- super resistant
- acid-fast
4
Q
Cell wall of Mycobacterium
A
- high lipid content
- waxes
- mycolic acids
5
Q
Mycolic acid
A
- complex fatty acids
- hydroxyl group on beta carbon
- aliphatic carbon chain on the alpha carbon
6
Q
Mycobacterium tuberculosis
A
- tuberculosis
- chronic cough with blood-containing mucous
7
Q
Mycobacterium leprae
A
- leprosy
- carriers but immune system is strong against it
8
Q
Genus Streptomyces
A
- strict aerobe
- aerial hyphae
- chains of conidia
- pigmented, smooth, hairy or spiky conidia
9
Q
How to distinguish Streptomyces species
A
- colour
- spore arrangement
- carb utilization
- antibiotic production
- melanin synthesis
- nitrate reduction
- hydrolysis of urea
10
Q
Streptomyces antibiotics
A
- amphotericin B
- chloramphenicol
- streptomycin
- tetracyclin
- nystatin
11
Q
Streptomyces somaliensis
A
- human pathogen found in Somalia and around equator
- actinomycetoma
- infection that causes ulcers and swelling under skin
