Fungi and Mould Biomedical Science PDF

Fungi and Mould Biomedical science Benjamin Tighe Intended Learning Outcomes By the end of this sessions students should be able to: Di3eren5ate a yeast from a mould Iden5fy fungal commensal :ora and their loca5on  - organees Features of Fungi -...

Fungi and Mould Biomedical science Benjamin Tighe Intended Learning Outcomes By the end of this sessions students should be able to: Di3eren5ate a yeast from a mould Iden5fy fungal commensal :ora and their loca5on  - organees Features of Fungi - nucleus wall-hard substance - chitin-cell Fungi are eukaryotic Most important fungus relevant to dentistry is Candida. Fungi present in 2 structural forms cells 1. Yeast -single 2. Mould -multicelled Dimorphic (can exist as both) Yeast (complete the table in your Fungi Workbook) CharacterisCcs of Yeasts Form Cell type Habitat Appearance Hyphae Spore Colour Oxygen Health risks Yeast (complete the table in your Fungi Workbook) CharacterisCcs of Yeasts Form Grow as large single cells. Cell type Unicellular Habitat Very common – on fruit, stomach of mammals oral cavity and vaginal areas Appearance White and thready. Usually oval in shape. Hyphae Yeasts do not have true hyphae. Instead, they form mul5cellular structures called pseudo-hyphae. Spore Yeast is a not a sporing species of fungi. Colour Yeasts are less colourful compared to moulds (colourless). Collec5vely yellow creamy colour Oxygen Yeast can grow in aerobic as well as in anaerobic condi5ons. Health risks It can cause infec5on in individuals with compromised immune systems.  Collect Shape of Fungi Stricte/long  A Sexual + asexual reproduction I Yeasts release of spores through my celal ? Often seen to have lateral projections – daughter cells Splits of from mother cell to produce next generation – ‘budding’ asexual Some reproduce by binary fission Pseudohyphae (chains of elongated budding cells) Candida forms pseudohyphae in the oral cavity Moulds (complete the table in your Fungi Workbook) CharacterisCcs of Moulds Form Cell type Habitat Appearance Hyphae Spore Colour Oxygen Health risks Moulds (complete the table in your Fungi Workbook) CharacterisCcs of Moulds Form Grow as mul5ple tubular branches Cell type Mul5cellular Habitat Typically found in damp, dark or humid areas. Appearance Mould has a :u3y appearance and can be found in several shapes Hyphae Have microscopic Slaments called hyphae Spore Mould is a sporing fungus Colour Are very colorful and maybe orange, green, black, brown, pink or purple. Oxygen Grows only in aerobic condi5ons Health risks Usually allergic reac5ons and respiratory problems.  - filamentous cell Moulds unicellular or multicular with chitinswals - Multicellular threads called hyphae - Hypha contain cytoplasm and organelles Mycelium is a mass of hyphae that forms mould colony > - Reproduce through spores asexual or sexual IdenCfy fungal commensal Hora and their locaCon  unique-selective. -livingharmony. in Fungal commensal Flora