Beginning billion of years ago, by a process
that was chaotic and violent, the dust circulating a newly formed star in the
Milky Way galaxy began to aggregate into larger bodies. About 4.5 billion years
ago, one of these bodies reached planet size: Earth had formed. Within the next
1 billion years, the first cellular life focus appeared; they were microbes.
Since then, microorganisms have evolved and diversified to occupy virtually
every habitat on earth.
Fungi are an enormous group of
organisms; about 90,000 fungal species have been described and some estimates
suggest that
1.5 million species exist. It is therefore not surprising that the
taxonomy of these organisms has been revised numerous times. Fungi are a
diverse group of microorganisms that range from unicellular forms (yeast) to
molds and mushrooms. Because of their metabolic capabilities, many fungi play
beneficial roles in relation to human well being and safety – these include
producing antibiotics and decomposing dead organisms.
Fungi sometimes referred to as ‘the true
fungi’ or Eumycota {‘eu’ meaning true and ‘mykes’ meaning fungus} describe
eukaryotic organisms that are spore boring, having absorptive nutrition, lack
chlorophyll and reproduce both sexually and asexually.
Fungi are very important in a variety
of ways; yeasts are essential to many industrial processes involving
fermentation. Examples include the making of bread, wine, beer, cheeses and soy
sauce. They are also important in the commercial production of many organic
acids (citric, Gallic etc). In addition, fungi are important research tools in
the study of fundamental biological processes. Other economic fungal importance
includes;
Recycling: Together with bacteria the fungi form a major role in recycling
dead and decayed matter.
Food: Many mushrooms are used as food by humans. Mushrooms species are
edible and are cultured in many parts of the world for sales.
Medicines: Penicillin antibiotic is derived from a common fungi penicillum. Many other fungi also
produce antibiotics which are used to control diseases in humans and animals
(griseofulvin).
Bio-control
Agents: Fungi are used to parasitize insects
which help control pests. Spores of fungi are sprayed on crops; this method is
cheaper and environmentally friendly.
Food Spoilage: Fungi play a major role in recycling organic material. Fungal
damage is responsible for large losses of stored food usually when the food
contains moisture.

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