general mycology a brief review

general mycology a brief review

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What you’ll learn:
  • introduction morphology of fugi
  • metabolism of fungi
  • growth of fungi
  • fungal genetics
  • mycotoxicosis
  • laboratory diagnosis of fungal diseases


In this course you find


history of science development

Morphology of fungi

Growth of fungi

Metabolism of fungi

Genetics f fungi

Diseases caused by fungi Allergies Mycosis Mycotoxin

Laboratory diagnosis of fungi

Antifungal Drugs used in treatment fungal diseases



The term “mycology” is derived from Greek word “mykes” meaning mushroom.     Therefore mycology is the study of fungi The ability of fungi to invade plant and animal tissue was observed in early 19th century but the first documented animal infection by any fungus was made by Augastino Bassi , who in 1835 studied the muscardine of silkworm proved that the infection was caused by a fungus Beauveria bassiana. Remark, who found the fungal nature of favus in 1837 Berg who reported oral candidiasis in 1841 Wilkinson, who described vaginal candidiasis in 1849. Tinea versicolor was described clinically in 1846 by Eichstaedt, and its etiologic agent was identified in 1853. Beigel reported white Piedra in 1856 Piedra, which means “stone” in , is an asymptomatic superficial fungal infection of the hair shaft. In 1865, Beigel first described Piedra in The Human Hair: Its , Growth, Diseases, and Their Treatment; although, he may have been describing Aspergillus infection. Cerqueira, tinea nigra in 1891 In 1910 Raymond Sabouraud published his Les Teignes, which was a comprehensive study of dermatophytic fungi. He is also regarded as father of medical mycology. In 1927, Nan Nizzi reported the description of the sexual state of Microspore gypsum. In 1927, Nannizzi reported the description of the sexual state of Microsporum gypseum the taxonomy of yeast fungi was described by Lodder and Kregervan Rij in 1952. The current of dermatophytes was published by Emmons in 1934 Finally, Gentles’ successful treatment of tinea capitis with griseofulvin by in 1958 saved many patients with tinea capitis from permanent hair loss a common side effect after treatment with thallium importance of fungi Fungi inhabit almost every niche in the environment and humans are exposed to these organisms in various fields of .

LEARN Harmful Effects of Fungi:

1. Destruction of , lumber, paper, and cloth. 2. Animal and human diseases, including allergies . 3. Toxins produced by poisonous mushrooms and within food (Mycelium and Mycotoxicosis) . 4. Plant diseases. 5. Spoilage of agriculture produce such as vegetables and cereals in the godown. 6. Damage the products such as magnetic tapes and disks, glass lenses, marble statues, bones and wax. Beneficial Effects of Fungi: 1. Decomposition – nutrient and carbon recycling . 2. Biosynthetic factories. The fermentation property is used for the industrial production of alcohols, fats, citric, oxalic and gluconic acids. 3. Important sources of , such as Penicillin. 4. Model organisms for biochemical and genetic studies. Eg: Neurospora crassa 5. Saccharomyces cerviciae is extensively used in recombinant DNA technology, which includes the Hepatitis B Vaccine . 6. Some fungi are edible (mushrooms). 7. Yeasts provide nutritional supplements such as vitamins and cofactors. 8. Penicillium is used to flavour Roquefort and Camembert cheeses. 9. Ergot produced by Claviceps purpurea contains medically important alkaloids that help in inducing uterine contractions, controlling bleeding and treating migraine. 10. Fungi (Leptolegnia caudate and Aphanomyces laevis) are used to trap mosquito larvae in paddy fields and thus help in malaria control.

Notice Fungi are eukaryote they have true nuclei surrounded by nuclear membrane and have rigid cell wall like plant they are larger than prokaryote with typically filamentous growth

Growth of fungi fungi need for their growth a source of carbon e.g sugar a source of nitrogen e.g peptone inorganic compound as ammonium nitrate and source of inorganic nutrients potassium phosphorous magnesium Water is an absolute requirement for fungi fungi are more tolerant for water stress than other organisms but in draught no growth occur spore can survive in a suitable medium the fungal spores germinate forming germ tubes which develop into hyphae Growth temperature of fungi mesophilic between 10- 40C optimum temperature 25-35C some fungi grow best at 37 C Thermophilic or Thermotolerant they grow at temperature between 20-and 60 C with optimum of 40C Psychrophilic fungi grow at low temperature that reach to-20 as molds which grow on frozen meat e.g. Cladosporium The optimum PH of fungi is in the range 56-6.5 while few fungi grow below ph3 or aboveph9 several acidophilic fungi grow at pH 2 e.g. Aspergillus and penicillium few fungi are basophilic can grow at 10-11 e.g. fusarium exosporium   metabolism of fungi  Metabolism of fungi fungi preferer moist habitat they are heterophilic need carbon in soluble form of carbohydrate as carbon in environment is found as complex polymer they use their own enzyme like cellulase chitinase in degrading cellulose lignin Fungi cannot fix gaseous nitrogen but they can utilize nitrate ammonia some amino acids by direct uptake by hyphal membrane they can utilize more complex nitrogen sources such as protein and peptides as they can utilize extracellular proteases that degrade amino acids into amino acids Fungi require macro and micronutrients sometimes vitamins fungal genetic  atypical model for studing genetic saccharomyces serviceae

diseases caused by fungi allergies mycosis  mycotoxin

lab diagnosis of fungal diseases how to take sample

antifungal  Drug used in treating fungal diseases.

Who this course is for:
  • medical students study either medicine pharmacy dentistry veterinary medicine science secondary school prepare themselves to study medicine or become science students prepare themselves to study medicine or science

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