DEFINITION OF TERMS Flashcards
: fungal infection
MYCOSIS
: multicellular fungi
MOULDS
: single-cell fungi
YEASTS
2 FORMS:
➢Requires the formation of specialized structure called spores
SEXUAL REPRODUCTIVE/PERFECT FUNGI/TELEOMORPH
: contained in a sac-like structure
Ascospores
: contained in a club-shaped structure
Basidiospores
: resulting from the fusion of cells from 2 different hyphae
Oospores
: resulting from the fusion of 2 identical hyphae
Zygospores
All sexual fungal life cycle consists of:
❖Plasmogamy: cell fusion
❖Karyogamy: nuclear fusion
❖Meiosis
cell fusion
Plasmogamy
nuclear fusion
Karyogamy
Involves division of the nucleus and cytoplasm
ASEXUAL REPRODUCTIVE/IMPERFECT FUNGI/ANAMORPH
Medically important
ASEXUAL REPRODUCTIVE/IMPERFECT FUNGI/ANAMORPH
The only fungal group to produce conidia
ASEXUAL REPRODUCTIVE/IMPERFECT FUNGI/ANAMORPH
: causes black mold; common food contaminant
Aspergillus niger
.: causes athletes foot
Trichophyton spp
: source of penicillin
Penicillum notatum
: source of cyclosporin
Tolypocladium inflatum
: used for improving the taste and texture of cheese
Other species of Penicillium
: long, branching filamentous that come together to form mycelium
HYPHAE
2-10 um in width
HYPHAE
HYPHAE 2 Types:
HYPHAE
3-6 um; have cellular separation or cross-walls
Septate Hyphae:
5-15 um; few or no cellular separations
Aseptate Hyphae (Sparsely Septate)
: lacks cross-walls
Coenocytic
: chain of cells formed by budding that resemble true hyphae
Pseudohyphae
Pseudohyphae 2 Classifications:
: function in food absorption for nutrients and penetrates the media that extends below the agar surface
Vegetative Hyphae
: directed above the surface of media and function as the reproductive structure
Aerial Hyphae
: masses of hyphae; comprise of the colony of fungus
MYCELIUM
MYCELIUM 3 Types:
Vegetative Mycelium
Aerial Hyphae
Fertile/Reproductive Mycelia
: colony mass of the fungus
THALLUS
: cause fungal disease to plants
PHYTOPATHOGENS
: places where the fungus is found in nature
RESERVOIR
specialized structure that enhances survival value such as resistance to adverse conditions that promote dispersion
spores
also result from sexual or asexual reproduction
spores
spore-like structure; cleavage, conjugation
conidia
2 forms of conidia:
- Macroconidia
- Microconidia
– large, multi-cellular conidida
- Macroconidia
– small, single- cellular conidida
- Microconidia
Types of conidia:
– resulting from the fragmentation of hyphae into individual cells; some are separated by normal cells
- Arthroconidia
– resulting from budding from mother yeast cells
- Blastoconidia
– can survive adverse environmental conditions amd are found in molds from terminal cells in the hyphae that have enlarged and have “fade walls”
- Chlamidoconidia
– formed by being pushed through a small pore in the parent cell
- Poroconidia
– tube-shaped conidia that can be branched
- Phyloconidia
– vase-shaped; (*) if parent outer cell wall
- Anelloconidia
: causes black mold; common food contaminant
- Aspergillus niger
: causes athletes foot
- Trichophyton spp.
: source of penicillin
- Penicillum notatum
: source of cyclosporin
- Tolypocladium inflatum
: used for improving the taste and texture of cheese
- Other species of Penicillium
constricted at the septa, form branches that begin with septation, have smaller terminal cells
Pseudohyphae
reproductive structure arises
Fertile/Reproductive Mycelia
soil, water, vegetation, etc.; habitat
RESERVOIR
Growth @ 25-30oC
YEASTS
Growth @ 35-37oC
MOLDS
nucleus divides and
migrates to the bud
Budding
nucleus divides and two daughter cells are produced
Fission
Branching and elongation of apical ends (Ex.[?])
Histoplasma capsulatum, Blastomyces dermatidis, Coccidoides immitis, Paracoccidoides brasilliensis, Sporothrix shcenckii, Penicillium mameffei
: both yeast and mold in the same culture
Polymorphic fungi
Polymorphic fungi (Ex. [?]: yeast phase follows mold phase as the colony ages)
Exophiala spp.
causes paralysis when ingested
Dinoflagellates