Mycology
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Questions and Answers

What is the unique feature of the cell wall of fungi that distinguishes it from other organisms?

The β-1,3 glucan cross overs and the chitin layer

What is the characteristic mode of reproduction of Saccharomycotina fungi?

Asexual budding

What is the name of the agar used specifically for fungal infections?

Sabouraud agar

What is the name of the common opportunistic pathogen that causes infections in humans?

<p>Candida albicans</p> Signup and view all the answers

What is the name of the test used to diagnose fungal infections, involving scraping a colony onto a slide and adding KOH?

<p>KOH test</p> Signup and view all the answers

What is the characteristic feature of the cell wall of fungi that is similar to that of arthropods?

<p>Chitin layer</p> Signup and view all the answers

What is the phylum of fungi that includes Saccharomycotina, Taphrinomycotina, and Pezizomycotina?

<p>Ascomycota</p> Signup and view all the answers

What is the common symptom of Candida albicans infection in the bloodstream?

<p>Fever and chills</p> Signup and view all the answers

What is the characteristic feature of the Taphrinomycotina subdivision of fungi?

<p>Multicellular hyphae that reproduce by sexual spores</p> Signup and view all the answers

what is candida albicans? and under what division

<p>type of fungus under the division of Saccharomycotina</p> Signup and view all the answers

what type of pathogen is C. albicans

<p>opportunistic pathogen that causes disease when it over grows</p> Signup and view all the answers

what are different infections caused by C. Albicans

<p>oral thrush, vaginal thrush</p> Signup and view all the answers

what tests are used for C. albicans?

<ol> <li> <p>Germ tube test- differentiates C.albicans from other candida species. C.albicans produces germ tubes which other species dont usually produce when incubated at 37C for 2-3 hours.</p> </li> <li> <p>KOH test- drop of 10% potassium hydroxide (KOH) solution is added to the specimen, slide is gently heated, slide is examined microscopically for the species.</p> </li> </ol> Signup and view all the answers

Study Notes

Introduction to Mycology

  • Mycology is the study of fungi
  • Mycoses is a fungal infection

Characteristics of Fungi

  • Belong to Kingdom Fungi and Domain Eukarya
  • Can be either unicellular or multicellular
  • Heterotrophic, requiring oxygen to survive
  • Stain gram-positive
  • Cell wall is made of chitin and has a chitin layer with glycoproteins
  • Unique features of the fungus cell wall include β-1,3 glucan cross overs and chitin cell wall

Ascomycota Phylum

  • Has three major subdivisions: Saccharomycotina, Taphrinomycotina, and Pezizomycotina
  • Saccharomycotina: unicellular yeast that reproduces by asexual budding, with a cell wall made of chitin
  • Taphrinomycotina: multicellular hyphae that reproduces by sexual spores
  • Pezizomycotina: multicellular hyphae that reproduces by sexual fission or asexual spores

Fungal Infections

  • Caused by opportunistic pathogens, such as Candida albicans
  • Most common infection caused by Saccharomycotina
  • Candida albicans can cause:
    • Oral thrush: overgrowth of C. albicans on the tongue, resulting in white spots down the throat
    • Vaginal thrush: overgrowth of C. albicans in the vaginal tract, resulting in thick white discharge and painful urination
    • Systemic infections: symptoms include fever, chills, skin rash, low blood pressure, abdominal pain, headaches, and muscle aches

Diagnosis

  • Sabouraud agar is used for fungi infections only
  • Agar dish should be tapped up
  • KOH test: scrape a colony onto a slide, add a few drops of KOH, and heat to speed up reaction

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Introduction to mycology.docx

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Test your knowledge of fungi, including their cell wall structures, mode of nutrition, and classification into different phyla. Learn about the unique features of fungal cell walls and the characteristics of Ascomycota phylum. Get ready to explore the world of mycology!

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