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Subject: Science and Technology

  • Widal Test: Flaws of Typhoid Diagnosis  

    Why in the news?

    Patients with fever in India often undergo testing and treatment for typhoid fever, primarily relying on the Widal test.

    • The Widal test, though widely used, has several limitations that affect its accuracy and reliability.

    Typhoid diagnosis using Widal Test

    • The Widal test is used primarily to diagnose typhoid fever.
    • Typhoid fever, caused by Salmonella Typhi and related bacteria, presents with symptoms like high fever, stomach pain, weakness, and gastrointestinal issues.
    • It detects antibodies in the patient’s blood against the O (somatic) and H (flagellar) antigens of Salmonella Typhi.
    • Procedure:
    1. The presence of these antibodies is detected through an agglutination reaction.
    2. The test involves serial dilution of the patient’s serum.
    3. The highest dilution at which agglutination occurs indicates the antibody titer, with higher titers suggesting an active infection.

    Diagnostic Challenges:

    • The gold standard for diagnosing typhoid involves isolating the bacteria from blood or bone marrow cultures, which is time-consuming and resource-intensive.
    • Widal test is commonly used due to its convenience and accessibility. However, the Widal test’s interpretation is complicated by factors like the need for multiple serum samples, variations in cutoff values, and potential cross-reactivity with antibodies from other infections or vaccines.

    Challenges with Widal Test:

    • Impractical: A single positive Widal test does not confirm typhoid.
    • Complicated result interpretation: High background antibody levels and variability in test cutoff values.
    • Cross-reactivity with antibodies from other infections and false negatives due to prior antibiotic therapy undermine test reliability.

    Consequences of Widal Test Use:

    • Erroneous results obscure the true burden of typhoid in India, leading to inappropriate treatment and financial strain on patients.
    • Overuse of antibiotics based on Widal test results contributes to antimicrobial resistance, exacerbating the challenge of treating typhoid.

    PYQ:

    [2016] Which of the following statements is/are correct?

    Viruses can infect

    1. Bacteria

    2. Fungi

    3. Plants

    Select the correct answer using the code given below.

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1, 2 and 3

  • CRISPR’s Breakthrough in Treating Blindness

    Why in the news?

    Scientists have successfully used CRISPR-Cas9 gene editing to restore vision in individuals with a rare form of inherited or congenital blindness.

    • The groundbreaking clinical trial, named “BRILLIANCE,” demonstrated promising results in improving vision and quality of life for participants with Leber congenital amaurosis (LCA), a severe vision disorder.

    What is Leber Congenital Amaurosis (LCA)?

    • LCA is a rare genetic disorder that primarily affects the retina the ‘light-sensitive’ tissue at the back of the eye. It leads to severe visual impairment or blindness at birth or within the first few months of life.
    • It is inherited in an autosomal recessive manner, meaning a child needs to inherit one defective gene from each parent to develop the condition.
    • There are several genes associated with LCA, with mutations in at least 14 different genes known to cause the disorder.
    • These genes generally affect the development and function of photoreceptors or the retinal pigment.

    Key highlights of the BRILLIANCE trial:

    • The BRILLIANCE trial involved 12 adults and two children diagnosed with LCA, a condition characterized by early-onset vision loss.
    • Participants received a single dose of a CRISPR gene therapy called EDIT-101, designed to correct mutations in the CEP290 gene responsible for LCA.
    • In this case, CRISPR-Cas9 cuts out the faulty DNA segment in the CEP290 gene and replaces it with a healthy DNA sequence, restoring the function of the CEP290 protein crucial for vision.
    • Out of 14 participants, 11 experienced improved vision without serious side effects.

    Back2Basics: CRISPR-Cas9 Gene Editing

    • CRISPR-Cas9 stands for Clustered Regularly Interspaced Short Palindromic Repeats and CRISPR-associated protein 9.
    • It is a technology that allows geneticists and researchers to edit parts of the genome by altering sections of the DNA sequence.
    • Emmanuelle Charpentier and Jennifer Doudna’s work on CRISPR-Cas9 as a ‘molecular scissor’ earned them the 2020 Nobel Prize in chemistry.
    • The system consists of two key components:
    1. Cas9: This is the enzyme that acts like a pair of molecular scissors. It is responsible for cutting the DNA strand at a specific location, allowing for the removal, addition, or alteration of DNA at that site.
    2. Guide RNA (gRNA): This is a piece of RNA that is designed to find and bind to a specific sequence of DNA that matches its code. The gRNA guides the Cas9 enzyme to the exact spot in the genome where an edit is desired.
    • Mechanism:
      • The process begins with the design of a gRNA that matches the DNA sequence where an edit is needed.
      • Once inside the cell, the Cas9 enzyme and the gRNA form a complex that can identify and bind to the target DNA sequence.
      • The Cas9 then cuts the DNA at this location.
      • After the DNA is cut, the cell’s natural repair mechanisms can be harnessed to add or remove genetic material, or to make specific changes to the DNA.

     

    PYQ:

    [2019] What is Cas9 Protein that is often mentioned in news?

    (a) A molecular scissors used in targeted gene editing

    (b) A biosensor used in the accurate detection of pathogens in patients

    (c) A gene that makes plants pest-resistant

    (d) A herbicidal substance synthesized in genetically modified crops

  • Magnetic Resonance Imaging (MRI) and the Science behind

    Why in the news?

    • Magnetic Resonance Imaging (MRI) revolutionized medical diagnostics, offering non-invasive insights into soft tissues.
    • The pioneering efforts of Paul Lauterbur and Peter Mansfield led to its commercialization, earning them the Nobel Prize in Medicine in 2003.

    What is MRI?

    • Magnetic resonance imaging (MRI) is a non-invasive diagnostic procedure used to obtain detailed images of soft tissues within the body.
    • It is particularly valuable for imaging sophisticated structures like the brain, cardiovascular system, spinal cord, joints, muscles, liver, and arteries.
    • MRI is instrumental in diagnosing and monitoring various conditions, including cancer, neurological disorders (such as Alzheimer’s and stroke), and cardiovascular diseases.
    • Functional MRI (fMRI) can also assess brain activity by monitoring changes in blood flow.

    Working Principle:

    • MRI utilizes the magnetic properties of hydrogen atoms (one proton with one electron around it), which are abundant in water and fat molecules found throughout the body.
    • The MRI machine generates a powerful magnetic field, aligning hydrogen atoms within the body.
    • Radiofrequency pulses are then applied, causing hydrogen atoms to absorb energy and emit signals.
    • These emitted signals are detected by sensors and processed by a computer to create detailed images of the body’s internal structures.

    Components of an MRI Machine:

    The MRI machine consists:

    • Superconducting Magnet: Large magnet (superconducting magnet) that produces a powerful and stable magnetic field.
    • Gradient Coils: Gradient magnets produce smaller magnetic fields with varying strengths and directions, allowing for precise imaging of specific body areas.
    • Radiofrequency Coils: This emit radiofrequency pulses to excite hydrogen atoms in the body. The frequency of pulse the ‘excess’ atoms have to absorb is called the Larmor frequency.
    • Detectors: It capture emitted signals from hydrogen atoms and convert them into image data for analysis.

    Advantages of MRI:

    • High-Resolution Imaging: MRI offers high-resolution imaging with excellent tissue contrast, allowing for accurate diagnosis and treatment planning.
    • Versatile Viewing Angles: It can visualize structures from various angles without the need for repositioning, providing comprehensive information.
    • Safety and Non-Invasiveness: MRI scans are non-invasive and do not involve ionizing radiation, making them safe for repeated use.
    • Enhanced Image Quality: Contrast agents can enhance image quality by highlighting specific tissues or abnormalities.

    Limitations of MRI:

    • High Costs: MRI machines are expensive to purchase and maintain, resulting in high healthcare costs for patients.
    • Requirement for Patient Stillness: Patients undergoing MRI scans must remain still for extended periods to prevent image distortion, which can be challenging for some individuals.
    • Discomfort or Anxiety: The strong magnetic fields and loud noises produced during MRI scans may cause discomfort or anxiety for patients.
    • Limitations with Metallic Implants: Certain metallic implants or objects can interfere with MRI scans, limiting their use in individuals with such implants.

    PYQ:

    [2020] With the present state of development, Artificial Intelligence can effectively do which of the following?

    1. Bring down electricity consumption in industrial units
    2. Create meaningful short stories and songs
    3. Disease diagnosis
    4. Text-to-Speech Conversion
    5. Wireless transmission of electrical energy

    Select the correct answer using the code given below:

    (a) 1, 2, 3 and 5 only

    (b) 1, 3 and 4 only

    (c) 2, 4 and 5 only

    (d) 1, 2, 3, 4 and 5

  • Role of Fusobacterium in Colorectal Cancer

    Why in the news?

    • Researchers at the Fred Hutchinson Cancer Center in the US have identified specific subtypes of Fusobacterium nucleatum associated with colorectal cancer (CRC) tumors.
    • These subtypes, particularly Fusobacterium nucleatum animalis (Fna), have been found in relatively higher quantities in CRC tumors.

    About Fusobacterium nucleatum

    • Fusobacterium nucleatum is a species of bacteria commonly found in the human mouth.
    • It is a gram-negative anaerobic bacterium, meaning it does not require oxygen for growth.
    • While typically residing in the oral cavity, it has been associated with various diseases and conditions, including periodontal diseases and colorectal cancer.

    Association with Colorectal Cancer (CRC):

    • In cases of colorectal cancer (CRC), Fusobacterium nucleatum has been found within tumors in the gut.
    • Studies have shown that this bacterium can aid cancer cells in evading the immune system and promoting metastasis, or the spread of cancer to other parts of the body.
    • Its presence in CRC tumors has led to investigations into its potential role in the development and progression of colorectal cancer.

    Impact:

    • Assisting cancer cells in evading the immune system.
    • Promoting inflammation and creating an environment conducive to tumor growth.
    • Facilitating metastasis by interacting with cancer cells and promoting their spread to other tissues.

    PYQ:

    [2013] Improper handling and storage of cereal grains and oilseeds result in the production of toxins known as Aflatoxins which are not generally destroyed by normal cooking process. Aflatoxins are produced by:

    (a) Bacteria

    (b) Protozoa

    (c) Moulds

    (d) Viruses

  • West Nile Fever Outbreak in Kerala 

    Why in the news?

    • The Kerala government disclosed the re-emergence of West Nile fever cases in Thrissur, Malappuram, and Kozhikode districts.
    • West Nile fever was first detected in Kerala in 2011, with a fatal case recorded in 2019 involving a six-year-old from Malappuram.

    What is West Nile Fever?

    • West Nile fever is caused by a West Nile Virus (WNV) transmitted through bites from infected Culex mosquitoes.
    • The WNV is a mosquito-borne, single-stranded RNA virus.
    • According to the WHO, it is a member of the flavi-virus genus and belongs to the Japanese Encephalitis antigenic complex of the family Flaviviridae.

    How does it spread?

    • It is transmitted by infected mosquitoes between and among humans and animals, including birds, which are the reservoir host of the virus.
    • Mosquitoes become infected when they feed on infected birds, which circulate the virus in their blood for a few days.
    • The virus eventually gets into the mosquito’s salivary glands.
    • During later blood meals (when mosquitoes bite), the virus may be injected into humans and animals, where it can multiply and possibly cause illness.
    • WNV can also spread through blood transfusion, from an infected mother to her child, or through exposure to the virus in laboratories.
    • It is not known to spread by contact with infected humans or animals.

    Symptoms of WNV infection:

    • The disease is asymptomatic in 80% of the infected people.
    • The rest develop what is called the West Nile fever or severe West Nile disease.
    • In these 20% cases, the symptoms include fever, headache, fatigue, body aches, nausea, rash, and swollen glands.

    PYQ:

    [2017] Consider the following statements:

    1. In tropical regions, Zika virus disease is transmitted by the same mosquito that transmits dengue.

    2. Sexual transmission of Zika virus disease is possible.

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

     

    Back2Basics: Type of Viruses 

    Subtypes Description Examples
    DNA Viruses Herpesviruses DNA viruses with a complex structure causing various diseases including cold sores, chickenpox, and mononucleosis. HSV-1, HSV-2, VZV, EBV
    Papillomaviruses DNA viruses associated with warts and certain cancers. HPV
    Adenoviruses DNA viruses causing a wide range of infections in humans. Adenovirus types causing respiratory, gastrointestinal, and ocular infections
    Poxviruses Large, complex DNA viruses responsible for diseases like smallpox. Variola virus (smallpox), Vaccinia virus
    RNA Viruses Positive-Sense RNA Viruses RNA viruses with genomes that can directly serve as mRNA, causing diseases like the common cold, Zika, and COVID-19. Picornaviruses, Flaviviruses, Coronaviruses
    Negative-Sense RNA Viruses RNA viruses requiring transcription into positive-sense RNA before translation, causing diseases like influenza and rabies. Orthomyxoviruses, Paramyxoviruses, Rhabdoviruses
    Retroviruses RNA viruses that use reverse transcriptase to integrate their genome into the host cell’s DNA. HIV, HTLV
    Double-Stranded RNA (dsRNA) Viruses RNA viruses with double-stranded RNA genomes causing gastroenteritis and other infections. Reoviruses
    Single-Stranded RNA (ssRNA) Viruses with Ambisense Genome RNA viruses with genomes containing both positive-sense and negative-sense RNA regions. Arenaviruses, Bunyaviruses
    Single-Stranded RNA (ssRNA) Viruses with Segmented Genome RNA viruses with genomes consisting of multiple segments, causing diseases like influenza and hemorrhagic fevers. Orthomyxoviruses, Bunyaviruses
    Single-Stranded RNA (ssRNA) Viruses with Circular Genome Satellite viruses with a circular RNA genome requiring helper viruses for replication. Hepatitis Delta Virus (HDV)
    Enveloped Viruses Influenza Viruses RNA viruses surrounded by a lipid envelope causing seasonal flu outbreaks. Influenza A, B, C viruses
    Herpesviruses Enveloped DNA viruses causing diseases like cold sores, chickenpox, and mononucleosis. HSV-1, HSV-2, VZV, CMV
    Coronaviruses Enveloped RNA viruses causing diseases like severe acute respiratory syndrome (SARS) and COVID-19. SARS-CoV, MERS-CoV, SARS-CoV-2
    HIV Enveloped retroviruses responsible for acquired immunodeficiency syndrome (AIDS). Human immunodeficiency virus
    Ebola Virus Enveloped RNA virus causing severe hemorrhagic fever in humans. Ebola virus
    Non-enveloped Viruses Adenoviruses DNA viruses lacking a lipid envelope, causing various infections in humans. Adenovirus types causing respiratory, gastrointestinal, and ocular infections
    Papillomaviruses DNA viruses associated with warts and certain cancers, lacking an envelope. HPV
    Noroviruses RNA viruses causing gastroenteritis, lacking an envelope. Norovirus
    Rotaviruses RNA viruses causing severe gastroenteritis in infants and young children, lacking an envelope. Rotavirus
    Bacteriophages T4 Bacteriophage Viruses that infect bacteria, with a complex structure and lifecycle. T4 bacteriophage
    Lambda Phage Temperate bacteriophage capable of lysogenic and lytic cycles in E. coli. Lambda phage

  • Catatumbo Lightning: A Torrent of Current

    Why in the news?

    Catatumbo lightning is a natural event seen over the Catatumbo River in Venezuela, where lightning strikes almost nonstop.

    What is Catatumbo Lightning?

    • Catatumbo Lightning is an atmospheric phenomenon that occurs over the Catatumbo River in Venezuela.
    • It specifically occurs at the Catatumbo Delta, where the river meets Lake Maracaibo.
    • It is known as one of the world’s largest lightning displays.
    • This natural spectacle involves frequent and nearly continuous lightning strikes that illuminate the night sky, creating a mesmerizing light show.
    • Catatumbo Lightning is most prevalent during the wet season, typically from April to November.
    • The consistent and abundant lightning activity has earned the region the moniker “the lightning capital of the world.”

    Factors behind Catatumbo Lightning

    • Weather Dynamics
    • Warm, moisture-laden air from the Caribbean Sea clashes with cooler air descending from the Andes mountains, creating a dynamic interplay of atmospheric forces.
    • This collision, accentuated by the local landscape, triggers rapid upward movement of warm air, leading to the formation of towering cumulonimbus clouds.
    • Electrical Charge Generation
    • Strong winds and temperature differentials within these clouds generate electrical charges.
    • Cumulonimbus clouds, towering over 5 km high, accumulate vast amounts of static electricity.
    • Lightning Discharge: When the electrical potential within the clouds reaches a critical level, it discharges in the form of lightning strikes.

    Characteristics of Catatumbo Lightning

    • Catatumbo lightning occurs on approximately 160 nights annually, exhibiting a remarkable longevity.
    • At its peak, the phenomenon generates an astonishing average of 28 lightning strikes per minute.

    PYQ:

    [2013] During a thunderstorm, the thunder in the skies is produced by the

    1. Meeting of cumulonimbus clouds in the sky

    2. Lightning that separates the nimbus clouds

    3. Violent upward movement of air and water particles

    Select the correct answer using the codes given below:

    (a) 1 only

    (b) 2 and 3

    (c) 1 and 3

    (d) None of the above produces the thunder

  • [pib] May 5: World Pulmonary Hypertension Day 

    Why in the news?

    Every year on May 5, pulmonary hypertension organizations and groups around the world participate in World Pulmonary Hypertension Day.

    What is Pulmonary Hypertension?

    • Pulmonary hypertension (PH) is a condition characterized by high blood pressure in the pulmonary arteries, which are the blood vessels that carry blood from the heart to the lungs.
    • This elevated pressure in the pulmonary arteries can lead to various symptoms and complications, affecting the heart’s ability to pump blood effectively to the lungs and the rest of the body.

    Here are some key aspects of pulmonary hypertension:

    Causes:

    1. Idiopathic Pulmonary Arterial Hypertension (IPAH): In many cases, the exact cause of pulmonary hypertension is unknown, and it is referred to as idiopathic. IPAH is a subtype of PH without an identifiable cause.
    2. Secondary Pulmonary Hypertension: PH can also develop secondary to other underlying conditions, including:
      • Chronic obstructive pulmonary disease (COPD)
      • Interstitial lung disease
      • Sleep apnea
      • Connective tissue diseases such as scleroderma and lupus
      • Congenital heart diseases
      • HIV infection
      • Liver disease (cirrhosis)
    3. Genetic Factors: Some forms of PH may have a genetic component, with mutations in certain genes predisposing individuals to the condition.

    Features:

    • Symptoms: Symptoms of pulmonary hypertension may include:
        • Shortness of breath, especially during physical activity
        • Fatigue
        • Chest pain or pressure
        • Dizziness or fainting spells
        • Swelling in the ankles and legs (edema)
        • Bluish lips or skin (cyanosis)
    • Diagnostic Tests: Diagnosis of pulmonary hypertension typically involves a combination of medical history review, physical examination, and diagnostic tests, including:
        • Echocardiogram (ECG)
        • Right heart catheterization
        • Pulmonary function tests
        • Chest X-ray
        • CT scan or MRI of the chest
        • Blood tests
    • Treatment: Treatment for pulmonary hypertension aims to relieve symptoms, improve quality of life, and slow disease progression. Treatment options may include:
      • Medications such as vasodilators, endothelin receptor antagonists, and prostacyclin analogs
      • Oxygen therapy
      • Pulmonary rehabilitation
      • Surgery or a lung transplant in severe cases

    Hypertension Control Initiatives in India:

    • India Hypertension Control Initiative (IHCI) (2017): It was launched to strengthen the hypertension component of National Programme for Prevention and Control of Non-Communicable Diseases (NP-NCD) in primary care public sector facilities in India
    • 75/25 initiative (2023): Union Health Ministry announced the initiative- 75 million people with hypertension and diabetes to be put on Standard Care by 2025, through the Primary Health Centres (PHCs).

     

    PYQ:

    [2021] In the context of hereditary diseases, consider the following statements :​

    1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of egg.​

    2. A child inherits mitochondrial diseases entirely from mother and not from father.​

    Which of the statements given above is/are correct?

    (a) 1 only

    (b) 2 only

    (c) Both 1 and 2

    (d) Neither 1 nor 2

  • Endosymbiotic Theory and Symbiogenesis

    Why in the news?

    • The endosymbiotic theory suggests that tiny structures in cells called mitochondria and chloroplasts were once independent bacteria.
    • A biologist named Lynn Margulis came up with the idea that cells merged with bacteria, challenging the usual belief that evolution happens mainly through genetic changes.

     What is the Endosymbiotic Theory?

    • The endosymbiotic theory proposes that organelles like mitochondria and chloroplasts were once free-living bacteria engulfed by recipient cells.
    • American biologist Lynn Margulis introduced Symbiogenesis, challenging the Neo-Darwinist consensus on genetic mutations driving evolution.
    • Margulis’s Struggle:
    1. Margulis’s manuscript on symbiogenesis faced rejection by academic journals before finally being published in The Journal of Theoretical Biology in 1967.
    2. It took years for mitochondria and chloroplasts to be acknowledged as former free-living bacteria turned endosymbionts.

    Recent Discoveries and Endosymbiotic Theory

    • Recent papers published in Science and Cell have reignited interest in the endosymbiotic theory.
    • The focus is on nitrogen fixation, crucial for proteins and DNA in living organisms.
    • Despite abundant atmospheric nitrogen, plants lack the means to utilize it efficiently.
    • Legumes host nitrogen-fixing bacteria in root nodules, aiding in ammonia production for plant use.

    Evolution of Nitroplast

    • Cyanobacterium UCYN-A was found in marine algae, establishing a symbiotic relationship.
    • Nitroplast, a new organelle, co-evolved with its host cell, satisfying criteria for organelle classification.
    • Nitroplast integrates into host cell function and architecture, imports host cell proteins, synchronizes growth, and is inherited during cell division.
    • Nearly half of nitroplast proteins are derived from the host cell.

    Nitrogen Cycle:


    The nitrogen cycle is a crucial biogeochemical cycle that describes the transformation and circulation of nitrogen in various forms within ecosystems. It involves several key steps:

    1. Nitrogen Fixation: This is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) or nitrate (NO3-) ions, which are forms of nitrogen that plants can utilize. Nitrogen fixation can occur through biological, atmospheric, and industrial processes. In biological nitrogen fixation, certain bacteria like Rhizobium spp. in the root nodules of leguminous plants or cyanobacteria convert N2 into ammonia.
    2. Ammonification: Ammonification is the process by which organic nitrogen compounds from dead organisms, feces, and other waste materials are converted into ammonia by decomposer organisms like bacteria and fungi during the decay process.
    3. Nitrification: Nitrification is the biological oxidation of ammonia (NH3) or ammonium (NH4+) to nitrite (NO2-) and then to nitrate (NO3-) by nitrifying bacteria such as Nitrosomonas and Nitrobacter. This process occurs in aerobic conditions and plays a crucial role in making nitrogen available to plants.
    4. Assimilation: Plants and other organisms take up ammonia, nitrate, or organic nitrogen compounds from the soil to use them in synthesizing proteins, nucleic acids, and other vital nitrogen-containing compounds.
    5. Denitrification: Denitrification is the process by which nitrate (NO3-) is converted back into nitrogen gas (N2) or nitrous oxide (N2O) by denitrifying bacteria under anaerobic conditions. This step completes the cycle by returning nitrogen to the atmosphere, closing the loop.
    6. Ammonium Ionization: In soils and aquatic environments, ammonium ions (NH4+) may undergo ionization, converting to ammonia gas (NH3), which can volatilize and return to the atmosphere.

    Significance of the Nitroplasts

    • Agriculture: Nitroplasts offer potential solutions for reducing the harmful effects of industrial ammonia production.
    • Biotechnology: Biotechnological applications may include engineering host cells and nitroplasts for efficient nitrogen fixation in plants.

    PYQ:

    [2021] In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?​

    (a) Carbon cycle

    (b) Nitrogen cycle

    (c) Phosphorus cycle

    (d) Sulphur cycle

  • Why are Indian spices facing the heat? | Explained

    Why in the News?

    Many have announced an investigation into possible contamination of spice mixes sold by top Indian brands like MDH and Everest Masalas.

    • Delhi-based think tank Global Trade Research Initiative (GTRI) in a recent note held, “With nearly $700 million worth of exports to critical markets at stake.”

    What is Ethylene Oxide (ETO)?

    • Ethylene oxide is a flammable, colorless gas at temperature above 51.3 F (10.7 C). When used directly in the gaseous form or in non-explosive gaseous mixtures with nitrogen or carbon dioxide, ETO serves as a disinfectant, fumigant, sterilizing agent, and insecticide.
    • ETO has also been reported to be produced from natural sources. In certain plants, ethylene (a natural plant growth regulator) is degraded to ethylene oxide. ETO ia also generated from water – logged soil, manure and sewage sludge.

    What are the health concerns?

    • ETO Usage and Contamination: ETO is a prohibited pesticide that is used as a sterilizing agent in the food industry, including spices.
    • Toxicity and Carcinogenicity: Residues of ETO can lead to the formation of toxic and carcinogenic compounds, such as ethylene glycol. Long-term exposure to ethylene oxide is associated with various health risks, including cancers like lymphoma and leukemia.
    • Previous Incidents: Indian-made products, including cough syrups, have been linked to incidents where ethylene glycol contamination resulted in fatalities, particularly among children in countries like Cameroon, Gambia, Indonesia, and Uzbekistan.
    • Regulatory Response: The European Food Safety Authority (EFSA) has banned the use of ETO and has flagged contamination issues in Indian spices in the past. A recent EFSA report highlighted carcinogenic chemicals found in numerous products linked to India.

    Which countries have flagged safety of Indian spices?

    • Hong Kong: Suspended the sale of three MDH spice blends and Everest fish curry masala due to high levels of ethylene oxide (ETO).
    • Singapore: Ordered a recall of Everest spice mix, stating that ethylene oxide makes the spices unfit for human consumption and poses a cancer risk.
    • United States: The FDA is aware of the reports and is gathering additional information about the situation.
    • Maldives: The Maldives FDA has suspended the sale of spices produced by Everest and MDH.
    • Australia: Food Standards of Australia and New Zealand is working with international counterparts to understand the issue and determine if further action is required.
    • Bangladesh: Gathering information on companies importing possibly contaminated products and plans to carry out examinations if necessary.

    What are the operational challenges faced by the Indian government?

    • Lack of Standardized Protocol System: India’s diverse food landscape, the lack of standardised monitoring and intentional food fraud may prevent manufacturers from efficiently tracing ingredients and assessing potential risks.
    • Lack of Database: Many companies struggle to trace ingredients, especially raw agricultural commodities, due to the lack of standardised recordkeeping and intentional food fraud. This prevents manufacturers from assessing potential risks, compromising the safety of the entire food supply chain.
    • Traceability is particularly challenging for small and medium sized businesses with limited resources.

    What steps is Food and Drug Administration (FDA) taking to improve the safety of spices?

    • Food Safety Modernization Act (FSMA): The FSMA rules address both domestically produced and imported foods.
      • For example, the preventive controls rule requires food facilities, including those that manufacture spices, to conduct a hazard analysis, identify hazards reasonably likely to occur, and establish preventive controls for such hazards.
    • Spices Board and its Measures: The Spices Board announced mandatory testing of consignments shipped to Singapore and Hong Kong, and gathering technical details and analytical reports from relevant food and drug agencies.
    • Issuance of Guidelines: A circular dated April 30 contains guidelines to exporters on preventing ETO contamination, developed after discussions with the Indian spice industry.
      • Measures include voluntary testing of ETO during raw and final stages, storing ETO treated products separately, and incorporating critical control points in hazard analysis.

    Way forward:

    • Enhanced Regulatory Oversight: Strengthen regulatory bodies such as the Food Safety and Standards Authority of India (FSSAI) to ensure strict adherence to food safety standards and regulations. Implement regular inspections, audits, and enforcement actions to monitor compliance with safety guidelines.
    • Improved Traceability Systems: Develop and implement robust traceability systems across the food supply chain to track the origin and movement of ingredients and products. Utilize technology such as blockchain and RFID tagging to enhance transparency and accountability.

    Mains question for practice 

    Q Explain the health risks associated with ethylene oxide (ETO) contamination in spices.

    Mains PYQ

    Q Elaborate the policy taken by the Government of India to meet the challenges of the food processing sector. (UPSC IAS/2019)

  • A computer science conundrum that could transform healthcare

    Why in the News? 

    Indian Health Care system faces a new set of complex problems that seem to be harder to solve because of their inherent complexity and the constraints they threaten to impose on resources.

    Quick Problems versus Complex Problems in Health Care:

    • Healthcare is filled with complex problems. Consider scheduling in a hospital: assigning doctors and nurses to shifts, booking operating theatres for surgeries, and organizing patient appointments.
    • It is an intricate puzzle that requires considering various factors — staff availability, urgency of medical cases, etc. — and potential changes such as emergency cases and cancellations.
    • The Quick Problems vs Complex Problems in Health Care question is this: there can be a shortcut to solve ‘Complex Problems’ problems as quickly as ‘Quick Problems’ problems.
    • The implication is that if Quick Problems equals Complex Problems, we could quickly find the optimal solution to these scheduling problems, thus significantly improving patient care.

    Implications for the Healthcare System:

    • Impact on Antibiotic Resistance: Quick analysis of bacterial genomes and prediction of resistance patterns could lead to more effective antibiotic prescriptions, improving patient outcomes and combating antibiotic resistance.
    • Advancement in Cancer Treatment: Swift identification of the optimal treatment for individual cancer patients could save lives by effectively tackling the complexity of cancer mutations and treatment options.
    • Optimization of Insurance Decision-Making: Insurance companies grappling with ‘NP’ problems in determining premiums and packages could benefit from a shortcut provided by solving the P versus NP problem. This could lead to fairer and more accurate premiums and conditions for customers.
    • Better utilization of Government health sector funding: Efficiently solving complex problems could lead to better utilization of government spending on healthcare, minimizing leakage and contributing to achieving universal health coverage.
    • Resource Constraint Reduction and Improved Health Outcomes: By solving complex healthcare problems more efficiently, there is the potential to dramatically reduce resource constraints and improve health outcomes broadly.

    Way Forward: Governments can enact policies and regulations that promote the responsible use of technology in healthcare and incentivize the adoption of evidence-based practices. This includes establishing standards for data privacy and security, fostering transparency in algorithmic decision-making, and ensuring equitable access to healthcare services.

    Mains PYQ 

    Q Public health system has limitation in providing universal health coverage. Do you think that private sector can help in bridging the gap? What other viable alternatives do you suggest? (UPSC IAS/2015)