6.7.3 Economic Importance of Bacteria

Introduction

Bacteria are both beneficial as well as harmful. They play a significant role in various aspects of life, from digestion and vitamin synthesis to industry and biotechnology. At the same time, some bacteria cause diseases and spoilage. This topic discusses the economic importance of bacteria, covering both their beneficial and harmful aspects.

Definition

Economic Importance of Bacteria: Bacteria have both beneficial and harmful effects on the economy, including their roles in digestion, industry, medicine, and agriculture.

In simple words: Bacteria are important economically because they help us in many ways, but they can also cause harm.

Core Concept

• Beneficial Bacteria
• Use of Bacteria in Research
• Use of Bacteria in Technology
• Harmful Bacteria

Detailed Explanation

Beneficial Bacteria

Bacteria are microorganisms that have a positive impact on various aspects of life. Some of the key benefits are listed below.

1. Help in Digestion

• Bacteria residing in the intestines play a crucial role in the digestion process.
• Some species help emulsify fats in the food, making it easier for the host to digest and absorb them.
• In the case of animals like cattle, certain bacteria specialize in breaking down complex substances like cellulose and starch.

2. Synthesis of Vitamins

• Specific bacteria possess the remarkable ability to synthesize essential vitamins, including vitamin K and vitamin B12.
• For example, *Escherichia coli* is one such bacterium known for its vitamin-producing capabilities.
• These synthesized vitamins have both commercial and nutritional significance.

3. Bacteria in Industry

• Bacteria find extensive use in various industrial processes, offering a cost-effective and efficient means of producing diverse substances.
• Industries rely on bacteria to manufacture products like:
• Acetic acid (used in vinegar production)
• Acetone
• Lactic acid
• Butanol (a type of alcohol)
• Vitamins
• Cheese
• Tobacco flavorings
• Bacteria also contribute to processes in the coffee and leather (tanning) industries.

4. Bacteria in Food Industry

• Bacteria play a pivotal role in the food industry, particularly in the production of dairy products.
• Yogurt, cheese, and butter, for instance, are all created with the help of specific strains of bacteria.

5. Nutrient Source

• As partially digested plant material moves through the digestive tracts of animals, it carries a substantial number of bacterial cells.
• These bacteria undergo digestion themselves, providing the host animal with a significant portion of its amino acids and vitamins.

6. Antibiotics

• A substantial proportion of antibiotics used in medicine are derived from various species of bacteria.
• Streptomycin, Aureomycin, Tetramycin, and many others have proven highly effective in treating bacterial infections.
• Most of the antibiotics are obtained from various species of actinomycetes group.

7. Biogas

• Bacteria possess the remarkable ability to decompose organic waste materials, including sewage, dung, garbage, and even stool.
• During this decomposition process, bacteria produce methane gas, which serves as a valuable source of fuel.
• Biogas plants in many villages harness this resource, utilizing the methane generated, which typically contains 54–70% methane, as an energy source.

8. Single Cell Protein

• A relatively recent addition to the food industry is "single cell protein."
• This term refers to protein obtained from the large-scale cultivation of microorganisms such as bacteria, yeast, fungi, and algae.
• This protein source can be used for human consumption or as animal feed, representing a sustainable approach to protein production.

Use of Bacteria in Research

• Microorganisms, e.g., bacteria, yeast, Neurospora, etc., have been extensively used in research.
• We owe to bacteria for many of the biological achievements for the benefit of human beings.
• For example, in 1952, Alfred D. Hershey and Martha Chase used T2 bacteriophage and bacteria to prove that DNA is the hereditary material.

Use of Bacteria in Technology

1. Biotechnology Products

• Free-living organisms in the environment that have a foreign gene inserted into them are called transgenic organisms.
• Bacteria are used to clone a gene or to mass-produce a product.
• These products include hormones and similar types of proteins or vaccines, e.g.:
• Insulin
• Growth hormones
• Clotting factor VII for hemophilia

2. Protection and Enhancement of Plants

• Genetically engineered bacteria can be used to promote the health of plants.
• For example, bacteria that normally live on plants and encourage the formation of ice crystals have been changed from frost-plus to frost-minus bacteria.

3. Bioremediation

- Naturally occurring bacteria that eat oil can be genetically engineered to clean up beaches after oil spills.

4. Chemical Production

• Organic chemicals are often synthesized by using bacteria to carry out the synthesis.
• Today it is possible to manipulate the genes that code for these enzymes.
• For example, genetically engineered bacteria are used to produce phenylalanine.

5. Mineral Processing

- Genetic engineering may enhance the ability of bacteria to extract copper, uranium, and gold from low-grade sources.

Harmful Bacteria

• Bacteria produce acids, which convert wine to vinegar.
• Bacteria cause decay of wood, leather, fabrics, etc.
• Bacteria spoil the food materials by decomposition.
• Parasitic bacteria attack plants and cause various diseases in them.
• Many human diseases are also caused by bacteria.

Intermediate Level

Beneficial Bacteria in Detail

Use of Bacteria in Research

Use of Bacteria in Technology

Harmful Bacteria in Detail

Important Points

• 1. Bacteria are both beneficial as well as harmful.
• 2. Beneficial Bacteria:
• - Help in Digestion: Bacteria residing in the intestines play a crucial role in the digestion process. Some species help emulsify fats in the food, making it easier for the host to digest and absorb them. In the case of animals like cattle, certain bacteria specialize in breaking down complex substances like cellulose and starch.
• - Synthesis of Vitamins: Specific bacteria possess the remarkable ability to synthesize essential vitamins, including vitamin K and vitamin B12. For example, Escherichia coli is one such bacterium known for its vitamin-producing capabilities. These synthesized vitamins have both commercial and nutritional significance.
• - Bacteria in Industry: Bacteria find extensive use in various industrial processes, offering a cost-effective and efficient means of producing diverse substances. Industries rely on bacteria to manufacture products like acetic acid (used in vinegar production), acetone, lactic acid, butanol (a type of alcohol), vitamins, cheese, and tobacco flavorings. Bacteria also contribute to processes in the coffee and leather (tanning) industries.
• - Bacteria in Food Industry: Bacteria play a pivotal role in the food industry, particularly in the production of dairy products. Yogurt, cheese, and butter, for instance, are all created with the help of specific strains of bacteria.
• - Nutrient Source: As partially digested plant material moves through the digestive tracts of animals; it carries a substantial number of bacterial cells. These bacteria undergo digestion themselves, providing the host animal with a significant portion of its amino acids and vitamins.
• - Antibiotics: A substantial proportion of antibiotics used in medicine are derived from various species of bacteria. Streptomycin, Aureomycin, Tetramycin, and many others have proven highly effective in treating bacterial infections. Most of the antibiotics are obtained from various species of actinomycetes group.
• - Biogas: Bacteria possess the remarkable ability to decompose organic waste materials, including sewage, dung, garbage, and even stool. During this decomposition process, bacteria produce methane gas, which serves as a valuable source of fuel. Biogas plants in many villages harness this resource, utilizing the methane generated, which typically contains 54–70% methane, as an energy source.
• - Single Cell Protein: A relatively recent addition to the food industry is "single cell protein." This term refers to protein obtained from the large-scale cultivation of microorganisms such as bacteria, yeast, fungi, and algae. This protein source can be used for human consumption or as animal feed, representing a sustainable approach to protein production.
• 3. Use of Bacteria in Research:
• - Microorganisms e.g., bacteria, yeast, Neurospora etc. have been extensively used in research.
• - We owe to bacteria for many of the biological achievements for the benefit of human beings.
• - For example, in 1952 Alfred D. Hershey and Martha Chase used T2 bacteriophage and bacteria to prove that DNA is the hereditary material.
• 4. Use of Bacteria in Technology:
• - Biotechnology Products: Free-living organisms in the environment that have a foreign gene inserted into them are called transgenic organisms. Bacteria are used to clone a gene or to mass-produce a product. These products include hormones and similar types of proteins or vaccines e.g., insulin, growth hormones, clotting factor VII for hemophilia etc.
• - Protection and Enhancement of Plants: Genetically engineered bacteria can be used to promote the health of plants. For example, bacteria that normally live on plants and encourage the formation of ice crystals have been changed from frost-plus to frost-minus bacteria.
• - Bioremediation: Naturally occurring bacteria that eat oil can be genetically engineered to clean up beaches after oil spills.
• - Chemical Production: Organic chemicals are often synthesized by using bacteria to carry out the synthesis. Today it is possible to manipulate the genes that code for these enzymes. For example, genetically engineered bacteria are used to produce phenylalanine.
• - Mineral Processing: Genetic engineering may enhance the ability of bacteria to extract copper, uranium and gold from low-grade sources.
• 5. Harmful Bacteria:
• - Bacteria produce acids, which convert wine to vinegar.
• - Bacteria cause decay of wood, leather, fabrics etc.
• - Bacteria spoil the food materials by decomposition.
• - Parasitic bacteria attack plants and cause various diseases in them.
• - Many human diseases are also caused by bacteria.

Remember

• - Beneficial bacteria = digestion, vitamins, industry, food, antibiotics, biogas, single cell protein.
• - Research = Hershey and Chase (1952) proved DNA is the hereditary material.
• - Technology = biotechnology products, plant protection, bioremediation, chemical production, mineral processing.
• - Harmful bacteria = vinegar, decay, food spoilage, diseases.
• - Transgenic organisms = free-living organisms with a foreign gene inserted.
• - Bioremediation = use of bacteria to clean up pollutants.
• - Biogas = methane (54–70%) produced by bacteria.
• - Single cell protein = protein from large-scale cultivation of microorganisms.

Common Mistakes

• 1. Thinking all bacteria are harmful – Many bacteria are beneficial.
• 2. Confusing beneficial and harmful bacteria – Beneficial = digestion, vitamins, industry; Harmful = diseases, spoilage.
• 3. Thinking bacteria are only used in food – Bacteria are used in many industries, including medicine and biotechnology.
• 4. Forgetting the role of bacteria in digestion – Bacteria in the intestines help emulsify fats and break down cellulose.
• 5. Confusing the vitamins synthesized by bacteria – Vitamin K and vitamin B12.
• 6. Forgetting the scientists – Hershey and Chase (1952) proved DNA is the hereditary material.
• 7. Thinking antibiotics are only from fungi – Many antibiotics are derived from bacteria (actinomycetes).
• 8. Confusing biogas and single cell protein – Biogas = methane; Single cell protein = protein from microorganisms.
• 9. Thinking bacteria are not used in research – Bacteria are extensively used in research.
• 10. Forgetting the role of bacteria in bioremediation – Bacteria can clean up oil spills and other pollutants.
• 11. Confusing the harmful effects of bacteria – Vinegar production, decay, food spoilage, diseases.
• 12. Thinking bacteria cannot be genetically engineered – Bacteria can be genetically engineered for various purposes.

Quick Revision

• Bacteria are both beneficial as well as harmful.
• Beneficial Bacteria:
• Help in Digestion: Bacteria residing in the intestines play a crucial role in the digestion process. Some species help emulsify fats in the food, making it easier for the host to digest and absorb them. In the case of animals like cattle, certain bacteria specialize in breaking down complex substances like cellulose and starch.
• Synthesis of Vitamins: Specific bacteria possess the remarkable ability to synthesize essential vitamins, including vitamin K and vitamin B12. For example, Escherichia coli is one such bacterium known for its vitamin-producing capabilities. These synthesized vitamins have both commercial and nutritional significance.
• Bacteria in Industry: Bacteria find extensive use in various industrial processes, offering a cost-effective and efficient means of producing diverse substances. Industries rely on bacteria to manufacture products like acetic acid (used in vinegar production), acetone, lactic acid, butanol (a type of alcohol), vitamins, cheese, and tobacco flavorings. Bacteria also contribute to processes in the coffee and leather (tanning) industries.
• Bacteria in Food Industry: Bacteria play a pivotal role in the food industry, particularly in the production of dairy products. Yogurt, cheese, and butter, for instance, are all created with the help of specific strains of bacteria.
• Nutrient Source: As partially digested plant material moves through the digestive tracts of animals; it carries a substantial number of bacterial cells. These bacteria undergo digestion themselves, providing the host animal with a significant portion of its amino acids and vitamins.
• Antibiotics: A substantial proportion of antibiotics used in medicine are derived from various species of bacteria. Streptomycin, Aureomycin, Tetramycin, and many others have proven highly effective in treating bacterial infections. Most of the antibiotics are obtained from various species of actinomycetes group.
• Biogas: Bacteria possess the remarkable ability to decompose organic waste materials, including sewage, dung, garbage, and even stool. During this decomposition process, bacteria produce methane gas, which serves as a valuable source of fuel. Biogas plants in many villages harness this resource, utilizing the methane generated, which typically contains 54–70% methane, as an energy source.
• Single Cell Protein: A relatively recent addition to the food industry is "single cell protein." This term refers to protein obtained from the large-scale cultivation of microorganisms such as bacteria, yeast, fungi, and algae. This protein source can be used for human consumption or as animal feed, representing a sustainable approach to protein production.
• Use of Bacteria in Research:
• Microorganisms e.g., bacteria, yeast, Neurospora etc. have been extensively used in research.
• We owe to bacteria for many of the biological achievements for the benefit of human beings.
• For example, in 1952 Alfred D. Hershey and Martha Chase used T2 bacteriophage and bacteria to prove that DNA is the hereditary material.
• Use of Bacteria in Technology:
• Biotechnology Products: Free-living organisms in the environment that have a foreign gene inserted into them are called transgenic organisms. Bacteria are used to clone a gene or to mass-produce a product. These products include hormones and similar types of proteins or vaccines e.g., insulin, growth hormones, clotting factor VII for hemophilia etc.
• Protection and Enhancement of Plants: Genetically engineered bacteria can be used to promote the health of plants. For example, bacteria that normally live on plants and encourage the formation of ice crystals have been changed from frost-plus to frost-minus bacteria.
• Bioremediation: Naturally occurring bacteria that eat oil can be genetically engineered to clean up beaches after oil spills.
• Chemical Production: Organic chemicals are often synthesized by using bacteria to carry out the synthesis. Today it is possible to manipulate the genes that code for these enzymes. For example, genetically engineered bacteria are used to produce phenylalanine.
• Mineral Processing: Genetic engineering may enhance the ability of bacteria to extract copper, uranium and gold from low-grade sources.
• Harmful Bacteria:
• Bacteria produce acids, which convert wine to vinegar.
• Bacteria cause decay of wood, leather, fabrics etc.
• Bacteria spoil the food materials by decomposition.
• Parasitic bacteria attack plants and cause various diseases in them.
• Many human diseases are also caused by bacteria.

60-Second Revision

• Beneficial bacteria = digestion, vitamins, industry, food, antibiotics, biogas, single cell protein.
• Research = Hershey and Chase (1952) proved DNA is the hereditary material.
• Technology = biotechnology products, plant protection, bioremediation, chemical production, mineral processing.
• Harmful bacteria = vinegar, decay, food spoilage, diseases.
• Transgenic organisms = free-living organisms with a foreign gene inserted.
• Bioremediation = use of bacteria to clean up pollutants.
• Biogas = methane (54–70%) produced by bacteria.
• Single cell protein = protein from large-scale cultivation of microorganisms.
• Warning: Not all bacteria are harmful. Beneficial bacteria help in digestion, synthesize vitamins, produce antibiotics, and are used in industry. Hershey and Chase proved DNA is the hereditary material. Bacteria are used in biotechnology, bioremediation, and mineral processing. Harmful bacteria cause diseases, food spoilage, and decay.