Microbiology is the study of a great variety of living organisms which are invisible to the naked eye like bacteria and fungi and many other microscopic organisms. Although tiny in size these organisms form the basis for all life on earth. These microbes as they are also known as produce the soil in which plants grow and the atmospheric gases that both plants animals use. For about 3 billion years since the formation of earth microbes were the only lives on earth. Microorganisms have played a key role in the evolution of the planet earth.

Microorganisms affect animals, the environment, the food supply and the healthcare industry of many. There are many different types of microbiology including environmental, veterinary, food, pharmaceutical and medical microbiology which is the most prominent.

Microorganisms are very important to the environment, to human health and to the economy. Few have immense beneficial effects without which we could not exist. Others are really harmful, and our effort to overcome their effects tests our understanding and skills. Certain microorganisms can be beneficial or harmful depending on what we require from them.Microbiology

Harmful Microorganisms

Disease and decay are not inherent properties of organic objects, nor are they caused by physical damage, it is microorganisms that bring about these changes. We are surrounded by bacteria, virus, and fungi. Many cause diseases in cattle and crops and others are known for entering human bodies and causing various diseases.

Examples of familiar human diseases are:

Bacteria: pneumonia, bacterial dysentery, diphtheria, bubonic plague, meningitis, typhoid, cholera, salmonella, meningococcal

Virus:  Chickenpox, measles, mumps, German measles, colds, warts, cold sores, influenza

Protoctista: amoebic dysentery, malaria,

Fungi: ringworm, athlete’s foot


Decomposers Bacteria and most Fungi are saprotrophic and have an important role in an ecosystem as decomposers, they break down dead or waste organic matter and release inorganic molecules Green plants take these nutrients which are in turn consumed by animals, and the products of these plants and animals are again broken down by decomposers.

Yeast is a single-celled fungus that lives naturally on the surface of the fruit. It is economically important in bread-making and brewing beer and also in the making of yogurt.

Most microorganisms are unicellular; if they are multicellular, they lack highly differentiated tissues.

There fundamentally two different types of cells, One being Prokaryotic and the other Eukaryotic

Useful Microorganisms

Microbes especially prokaryotes are numerous in number in comparison to eukaryotes.

The lineage of life on Earth originated from these microbes:




Branches of microbiology

There are various different branches in microbiology and these include the following:

1.Bacteriology- The study of bacteria

2.Mycology –The study of fungi

3.Phycology- The study of photosynthetic eukaryotes. (Algae- Seaweed)

4.Protozoology – The study of protozoa (Single-celled eukaryotes)

5.Virology- The study of viruses, non-cellular particles which parasitize cells.

6.Parasitology- The study of parasites which include pathogenic protozoa certain insects and helminth worms.

7.Nematology- The study of nematodes.

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