MYCOVIRO - CH 60 of book part 1 Flashcards Preview

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Flashcards in MYCOVIRO - CH 60 of book part 1 Deck (77)
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1

Produce large, ribbon-like hyphae that contain occasional septa



MUCORALES (ZYGOMYCETES)

2

2. Have sporangia (saclike fruiting structures) that produce sporangiospores and is formed at the tip of a
supporting structure called sporangiophore

MUCORALES (ZYGOMYCETES)

3

3. Sporangiophores are connected to one another by occasionally septate hyphae called stolons, attached
to contact points where root-like structure (rhizoids) may appear and anchor the organism to the agar
surface.

MUCORALES (ZYGOMYCETES)

4

4. Commonly found on decaying vegetable matter or old bread or in soil

MUCORALES (ZYGOMYCETES)

5

- infection caused by mucorales

Mucormycosis

6

can lead to vascular invasion and rapidly produce thrombosis and tissue necrosis - perineural invasion can also occur

Mucormycosis

7

one of the most common presentation of mucormycosis

- rhinocerebral form

8

infection w/c involves nasal mucosa, palate, sinuses, orbit, face and brain

- rhinocerebral form

9

stains for mucorales ID

Calcofluor white or KOH

10

What to observe under microscope for mucorales ID

observe branching, broad-diameter, predominantly nonseptated hyphae

11

Cultivation: Fluffy, white to gray or brown hyphal growth, resembles cotton candy

mucorales

12

grows rapidly; covers agar suface within 24 to 96 hours

mucorales

13

hyphae may lift the lid of agar plate (aka "lid lifter")

mucorales

14

may appear to be coarse - dish is filled with loose, grayish hyphae, dotted with brown or black sporangia

mucorales

15

Mucorales spp
- unbranched sporangiophores; rhizoids appear opposite the point where stolon arises

Rhizopus spp

16

Mucorales spp
- singularly produced or branched sporangiophores with round sporangium at the tip; no
rhizoids or stolons

Mucor spp.

17

Mucorales spp
- pyriform sporangia with funnel-shaped area (apophysis)
- rhizoids originate between sporangiophores as with Absidia spp.

Lichtheimia spp.

18

- infections caused by dermatophytes involving the superficial areas of the body


Dermatomycoses

19

- most common fungal infections; referred to as tinea ("ringworm")

Dermatomycoses

20

- they break down and utilize keratin as nitrogen source

dermatophytes

21

- usually incapable of penetrating the subcutaneous tissue unless host is immunocompromised (even then, it is rare)

dermatophytes

22

gross appearance of lesion of which fungus: outer ring of the active progressing infection, with central healing

dermatophytes

23

stains for dermatophytes (2)

Calcofluor white or KOH

24

observe what structures for dermatophytes

presence of hyaline septate hyphae and/or arthroconidia

25

- infected hair shaft may be seen filled with masses of large arthroconidia in chains (endothrix invasion) or may show external masses of spores that ensheath the hair shaft (ectothrix invasion)

dermatophytes/dermatomycoses

26

used for final ID of dermatophytes

cultivation

27

what fungal infection reveal hyphae and air spaces within the shaft

T. schoenleinii

28

initial growth of dermatophytes is often subcultured onto what agars (2) to induce sporulation

cornmeal agar or potato dextrose agar

29


- most common causes of feet and nails infection



TRICHOPHYTON SPP.

30

- most are anthrophilic ("human-loving"), few are zoophilic (primarily infecting animals)

TRICHOPHYTON SPP.

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