Genetically Modified (GM) Microbes with special reference to biodegradation, biopesticides, bioremediation, mineral leaching, and biofertilizers.

Genetically Modified (GM) Microbes with special reference to biodegradation, biopesticides, bioremediation, mineral leaching, and biofertilizers.

GENETICALLY MODIFIED MICROBES (GMMs)

Definition

Genetically modified microbes are microorganisms whose genetic material has been altered using recombinant DNA technology to enhance or introduce desirable traits such as improved degradation ability, increased nutrient availability, or toxin production against pests.

Advantages of GM Microbes

High efficiency and specificity

Faster action than natural strains

Ability to function under extreme conditions

Reduced chemical pollution

Environment-friendly and cost-effective

1. GENETICALLY MODIFIED MICROBES IN BIODEGRADATION

Biodegradation

Biodegradation is the microbial breakdown of complex organic pollutants into simpler, non-toxic compounds.

Role of GM Microbes

Natural microbes often degrade pollutants slowly or incompletely. Genetic engineering improves metabolic pathways to enhance degradation.

Examples

Pseudomonas putida (Superbug)

Engineered by Ananda Chakrabarty

Contains multiple plasmids enabling degradation of:

Crude oil

Aromatic hydrocarbons

Toluene, xylene, camphor

GM E. coli expressing genes for:

Phenol degradation

Chlorinated hydrocarbon breakdown

Applications

Oil spill cleanup

Degradation of plastics, pesticides, dyes

Treatment of industrial effluents

2. GENETICALLY MODIFIED MICROBES AS BIOPESTICIDES

Biopesticides

Biopesticides are biological agents used to control agricultural pests.

Role of GM Microbes

Genetic modification enhances:

Toxicity to target pests

Stability and persistence

Host specificity

Example: Bacillus thuringiensis (Bt)

Genes encoding Cry toxins are modified for:

Higher expression

Wider pest range

Bt genes introduced into:

Bacteria

Plants (Bt cotton, Bt maize)

Other Examples

GM Pseudomonas fluorescens producing insecticidal toxins

Modified viruses (baculoviruses) for insect control

Advantages

Safe to humans and non-target organisms

Biodegradable

Reduces chemical pesticide usage

3. GENETICALLY MODIFIED MICROBES IN BIOREMEDIATION

Bioremediation

Bioremediation is the use of living organisms to detoxify or remove environmental pollutants.

Role of GM Microbes

Enhanced catabolic genes

Increased resistance to heavy metals

Faster pollutant uptake

Examples

GM Deinococcus radiodurans

Engineered to detoxify:

Mercury

Toluene

Radioactive waste

GM Ralstonia eutropha

Heavy metal accumulation (cadmium, lead)

Applications

Cleanup of contaminated soils

Industrial waste treatment

Nuclear waste sites

4. GENETICALLY MODIFIED MICROBES IN MINERAL LEACHING (BIOLEACHING)

Bioleaching

Bioleaching is the extraction of metals from ores using microorganisms.

Role of GM Microbes

Genetic modification increases:

Metal solubilization efficiency

Acid production

Resistance to toxic metals

Common Microorganisms

Thiobacillus ferrooxidans

Acidithiobacillus thiooxidans

GM Applications

Enhanced copper, gold, uranium leaching

Faster oxidation of metal sulfides

Reduced environmental damage compared to chemical mining

Advantages

Economical for low-grade ores

Eco-friendly

Energy-efficient

5. GENETICALLY MODIFIED MICROBES AS BIOFERTILIZERS

Biofertilizers

Biofertilizers are microbial inoculants that improve soil fertility and plant growth.

Role of GM Microbes

Genetic engineering improves:

Nitrogen fixation capacity

Phosphate solubilization

Plant hormone production

Examples

GM Rhizobium

Enhanced nitrogen fixation

Improved nodulation efficiency

GM Azotobacter

Increased ammonia production

GM Pseudomonas

Improved phosphate solubilization

Benefits

Reduced chemical fertilizer use

Improved soil health

Sustainable agriculture

ADVANTAGES OF GM MICROBES IN AGRICULTURE & ENVIRONMENT

High efficiency

Specific action

Environmentally safe

Economical

Sustainable alternative to chemicals

LIMITATIONS & BIOSAFETY CONCERNS

Horizontal gene transfer

Ecological imbalance

Regulatory and ethical issues

Containment and monitoring required

CONCLUSION

Genetically modified microbes play a crucial role in environmental protection and sustainable agriculture. Their applications in biodegradation, biopesticides, bioremediation, mineral leaching, and biofertilizers provide eco-friendly solutions to pollution and resource management challenges.

Comments

Electroporation – Detailed Notes

Electroporation – Detailed Notes Definition : Electroporation is a physical method of gene transfer in which cells are exposed to a brief, high-voltage electric pulse, creating temporary pores in the cell membrane. This allows DNA, RNA, proteins, or other molecules to enter the cytoplasm. It is widely used in bacteria, yeast, plant protoplasts, and mammalian cells. Key Concept: The electric field destabilizes the membrane, making it permeable to macromolecules. 1. Principle Cells are suspended in a conductive medium. A brief electrical pulse induces transient pores in the plasma membrane. DNA or other molecules present in the medium enter the cell through these pores. Membrane reseals after the pulse, and the molecule is retained inside the cell. Advantages of Principle: Direct and rapid. Works in many cell types. Does not require chemical carriers or viral vectors. 2. Materials Required Cells – bacterial, yeast, plant protoplasts, mammalian cells. DNA/RNA/other macromolecule – purifie...

Micropropagation for Large-Scale Production of Medicinal Plants, Tree Species and Ornamentals –

Micropropagation for Large-Scale Production of Medicinal Plants, Tree Species and Ornamentals – 1. Introduction Micropropagation is an in-vitro clonal propagation technique used for rapid multiplication of plants under aseptic and controlled laboratory conditions. It enables the production of a large number of genetically uniform, disease-free plants from a small amount of starting material (explant). This technique is especially important for medicinal plants, forest tree species and ornamental plants, where conventional propagation is slow, seasonal or inefficient. 2. Principle of Micropropagation Micropropagation is based on totipotency, the inherent ability of a single plant cell to regenerate into a complete plant when provided with: Suitable nutrient medium Proper plant growth regulators Controlled light, temperature and humidity Sterile conditions. 3. Stages of Micropropagation Micropropagation generally involves five stages : Stage I – Selection and Sterilization of Expla...

Third Semester M.Sc. Degree Examination, February 2024 231: PLANT BREEDING, HORTICULTURE AND BIOSTATISTICS

Third Semester M.Sc. Degree Examination, February 2024 Botany BO 231: PLANT BREEDING, HORTICULTURE AND BIOSTATISTICS (2019 Admission onwards) Time: 3 Hours I.Answer the following questions. 1.What is atomic gardening? 2.Name the cardamom research institute in Kerala. 3.Explain advantages of distant hybridisation. 4.Describe plant variety rights. 5.Write short notes on arboriculture. 6.What is vermicomposting? 7.Give short notes on cut flower industry. 8.What is ANOVA? 9.Describe the properties of binomial distribution. 10. Explain the use of LSD. Max. Marks: 75 (10 x 1 = 10 Marks) II.Answer the following questions in not more that 50 words. 11. (a) What do you mean by genetic modification techniques? OR (b) What is center of diversity of a species? 12. (a) Compare auto and allopolyploidy. OR (b) What are requirements of back cross breeding? 13. (a) Describe ideotype breeding and its significance. OR (b) What is the role of seed cer...

••CLASSIFICATION OF ALGAE - FRITSCH

MODULE -1 PHYCOLOGY CLASSIFICATION OF ALGAE - FRITSCH ❖F.E. Fritsch (1935, 1945) in his book“The Structure and Reproduction of the Algae”proposed a system of classification of algae. He treated algae giving rank of division and divided it into 11 classes. His classification of algae is mainly based upon characters of pigments, flagella and reserve food material. Classification of Fritsch was based on the following criteria o Pigmentation. o Types of flagella o Assimilatory products o Thallus structure o Method of reproduction Fritsch divided algae into the following 11 classes 1. Chlorophyceae 2. Xanthophyceae 3. Chrysophyceae 4. Bacillariophyceae 5. Cryptophyceae 6. Dinophyceae 7. Chloromonadineae 8. Euglenineae 9. Phaeophyceae 10. Rhodophyceae 11. Myxophyce...

❃GC-MS (GAS CHROMATOGRAPHY – MASS SPECTROMETRY) DETAILED NOTES

GC-MS (GAS CHROMATOGRAPHY – MASS SPECTROMETRY) DETAILED NOTES ┏━━━━━ •❃°•°❀°•°❃•━━━━•━━━ 1. INTRODUCTION GC-MS is a hyphenated analytical technique combining: Gas Chromatography (GC) : Separates volatile compounds in a mixture. Mass Spectrometry (MS) : Identifies and quantifies compounds based on mass-to-charge ratio (m/z). Developed in the 1950s–1970s, GC-MS is now widely used in forensic, pharmaceutical, environmental, and food analysis. Importance : Identifies unknown compounds Detects trace contaminants Provides both qualitative and quantitative information Example: Detection of pesticides in water, drug analysis in biological fluids, environmental pollutant detection. 2. PRINCIPLE GC-MS principle is based on two steps: A. Separation (GC) Sample is vaporized and carried by an inert gas (helium, nitrogen) through a capillary column. Compounds separate based on: Volatility Boiling point Interaction with column stationary phase Result: Different compounds elute at different retention ...

DNA FOOTPRINTING

DNA FOOTPRINTING Introduction DNA footprinting is a molecular biology technique used to identify the specific site(s) on DNA where proteins (such as transcription factors) bind. It reveals the exact nucleotide sequences protected by bound proteins against cleavage by nucleases or chemical agents. It is widely used to study DNA-protein interactions, transcription regulation, and gene expression control. Definition DNA footprinting: A technique used to locate the binding site of DNA-binding proteins on DNA by detecting protected regions that are resistant to enzymatic or chemical cleavage. Principle DNA-binding proteins protect the DNA segment they occupy. DNA exposed to nucleases (DNase I) or chemical cleavage agents is cut at accessible regions. Regions bound by protein remain unaffected, leaving a “footprint”. When fragments are separated on a denaturing polyacrylamide gel, the missing bands correspond to protein-binding sites. Key idea: Cleavage occurs everywhere except where the pro...

RESTRICTION MAPPING

RESTRICTION MAPPING Introduction Restriction mapping is a molecular biology technique used to determine the relative positions of restriction enzyme recognition sites on a DNA molecule. It involves digestion of DNA with one or more restriction endonucleases followed by analysis of fragment sizes using agarose gel electrophoresis. Restriction mapping is essential for DNA characterization, cloning strategies, gene localization, and genome analysis. Definition Restriction mapping is the process of identifying the number, order, and distances between restriction enzyme cleavage sites within a DNA fragment by analyzing the pattern of fragments generated after enzymatic digestion. Principle Restriction enzymes cut DNA at specific palindromic nucleotide sequences. When DNA is digested with: Single restriction enzyme → produces fragments based on its recognition sites Multiple restriction enzymes → produces fragments whose sizes reveal the relative positions of sites By comparing fragment size...

Fourth Semester M.Sc. Degree Examination, September 2019BotanySpecial Paper II - ElectiveBO 242 a: BIOTECHNOLOGY(2013 Admission onwards)

Reg. No....... Name......... G-5263 Fourth Semester M.Sc. Degree Examination, September 2019 Botany Special Paper II - Elective BO 242 a: BIOTECHNOLOGY (2013 Admission onwards) Max. Marks: 75 1. Answer the following questions: 1. Humulin 2. YAC 3. Cybrids 4. Hybridomas 5. IPR 6. Gene therapy 7. C DNA library 8. AFLP 9. Hairy root culture 10. Somacional variation (10 x 1=10 Marks) II. Answer the following questions in not more than 50 words : 11. (a) What are immobilized enzymes? What is its advantage? OR (b) Write a short note on molecular farming. 12. (a) Give an account of bioprocess technology for the production of secondary metabolites. OR (b) What are bioreactors? How it operates? 13. (a) What are probiotics?. How do they work? OR (b) Discuss the methodology and application of western blotting. 14. (a) Briefly explain the application of protoplast culture OR (b) Write a short note on gene therapy 15. (a) What are reporter genes? Discuss its utility in transformation studies O...

Information retrieval from databases - search concepts, Tools for searching, homology searching, finding Domain and Functional site homologies

Information retrieval from databases - search concepts, Tools for searching, homology searching, finding Domain and Functional site homologies Information Retrieval from Databases 1. Introduction Information retrieval in bioinformatics refers to the process of extracting relevant biological data (DNA, RNA, protein sequences, structures, or functional information) from databases. Aim : Identify sequences, functions, or structural features for analysis, comparison, and annotation. Databases can be primary (raw sequence data) or secondary/derived (annotated, processed data). 2. Search Concepts in Biological Databases 2.1 Types of Searches Exact Match Search Returns results only if the query exactly matches database entries. Useful for known accession numbers or IDs. Pattern/Keyword Search Searches based on specific motifs, keywords, or annotations. Example: “kinase domain,” “signal peptide.” Similarity/Homology Search Detects sequences similar to the query based on sequence alignment. Use...

Protein Sequence DatabasesPIR, SWISS-PROT and TREMBEL

Protein Sequence Databases PIR, SWISS-PROT and TREMBEL 1. Introduction Protein sequence databases are biological databases that store information about amino acid sequences of proteins, along with their functional, structural, and biochemical characteristics. Since proteins are the functional molecules of the cell, protein databases are essential for understanding gene expression, metabolism, enzymatic activity, signaling pathways, and evolution. Protein sequence databases mainly contain data derived from translated nucleotide sequences and experimental protein studies. 2. Types of Protein Sequence Databases Protein sequence databases are broadly classified into: A. Primary Protein Databases Contain original protein sequence data Minimal or no manual annotation B. Secondary Protein Databases Derived from primary databases Provide curated functional and structural information C. Composite Protein Databases Combine protein data from multiple sources Reduce redundancy 3. Protein Informati...

Notethepoint 43official Previous Question Paper Updates2.0

Search This Blog