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Subject: Science and Technology

  • Sleep Apnea contributes to Dementia in older adults

    Why in the News?

    A recent study from Michigan Medicine found that Obstructive Sleep Apnea (OSA), a common sleep disorder, increases the risk of dementia (loss of cognitive functioning) in adults, especially in women.

    What is Obstructive Sleep Apnea (OSA)?

    • OSA is a sleep disorder where breathing repeatedly stops and starts during sleep due to blocked airways.
    • It is marked by episodes of disrupted or restricted breathing, leading to brief awakenings throughout the night.
    • Symptoms include loud snoring, gasping for air, morning headaches, and daytime drowsiness.
    • Risk Factors: Common in individuals who are overweight, have large tonsils or suffer from nasal congestion.
      • In India, approximately 10.4 lakh people are reported to suffer from OSA, as per government data.
      • Untreated OSA is associated with various health risks, including heart disease, diabetes, and cognitive decline.

    Recent Findings on OSA and Dementia Risk

    • A study from Michigan Medicine found a link between OSA and increased dementia risk, especially in older adults over 50.
      • Women with known or suspected OSA were found to have a higher likelihood of developing dementia compared to men, with dementia diagnoses increasing as women age.
    • Another study by NIMHANS focused on the link between stroke and OSA.
      • 105 stroke patients over the age of 50 were studied using polysomnography (PSG), which tracks brain waves and sleep breathing patterns.
      • Results showed that 88% of stroke patients had sleep apnea soon after their stroke, with 38% having severe OSA.

  • How remote sensing system LiDAR helped discover a lost Mayan city?

    Why in the News?

    Scientists have used LiDAR technology to find an ancient Mayan city hidden for centuries under a thick jungle in Mexico.

    What is LiDAR?

    • LiDAR (Light Detection and Ranging) is a remote sensing technology that uses laser light pulses to measure distances between a sensor (often airborne) and Earth’s surface.
    • It produces high-resolution, 3D models of ground elevation with up to 10 cm vertical accuracy, as per the US Geological Survey.

    How Does LiDAR Work?

    • LiDAR Setup: Includes a laser, a scanner, and a GPS receiver. The laser emits rapid pulses of light that reflect off surfaces on the ground, including natural features and man-made structures.
    • Data Collection: The reflected light returns to the sensor, and the LiDAR system calculates the two-way travel time to determine the distance to each point on Earth’s surface.
    • Data Processing: GPS and Inertial Measurement System (IMS) data are used to create accurate maps. The initial data forms a “point cloud” representing surfaces like vegetation, buildings, and terrain.
    • “Bare Earth” Model: By filtering out structures and vegetation, LiDAR can create a Digital Elevation Model that shows just the ground terrain.

    Applications of LiDAR

    • Geography and Mapping: Creates precise 3D information for topographic mapping.
    • Urban Planning and Infrastructure: Used in planning transportation routes, assessing flood risk, and managing natural resources.
    • Conservation: Helps monitor forest health, manage habitats, and detect environmental changes.
    • Engineering and Policy: Provides data for infrastructure design, environmental policy making, and land-use planning.

    Why is LiDAR Useful for Archaeologists?

    • Large-Area Surveying: LiDAR enables archaeologists to study extensive areas quickly, bypassing the need for labor-intensive, on-ground exploration.
    • Vegetation Penetration: LiDAR can “see through” dense tree canopies by using the reflections that pass through gaps, allowing mapping of hidden structures and terrain.
    • Detailed Site Mapping: With “bare earth” models, archaeologists can strip away vegetation layers to reveal hidden archaeological sites.
    • Case Study – Maya Civilization: Archaeologists discovered the lost Mayan city of Valeriana in Mexico by analyzing publicly available LiDAR data, uncovering plazas, temple pyramids, a ballcourt, and other features indicative of a Classic Maya capital.

    Where is the Indian Government using LiDAR ?

    • High-Speed Rail Projects: NHSRCL (National High-Speed Rail Corporation Limited) uses aerial LiDAR surveys for the Delhi-Varanasi High-Speed Rail Corridor, reducing survey time from 10-12 months to 3-4 months by capturing detailed topographical data within a 300-meter corridor.
    • National Highways: NHAI mandates Mobile LiDAR for feasibility studies and project reports, enhancing the accuracy and efficiency of highway surveys across extensive networks.
    • Forest Mapping: The Ministry of Environment is piloting LiDAR-based forest mapping across states to improve forest management and accurately monitor forest cover changes.
    • Water Resource Management: WAPCOS is using LiDAR to identify groundwater recharge zones, aiding water resource management and mitigating human-animal conflicts in forested areas.
    • Urban Planning: Chandigarh and Gujarat are using LiDAR for GIS mapping and drone-based surveys, respectively, supporting detailed city models, urban planning, and infrastructure mapping.

    Conclusion: LiDAR technology has revolutionized fields from archaeology to urban planning by providing precise 3D mapping. In India, it’s enhancing infrastructure projects, environmental monitoring, and urban planning, proving invaluable for efficient, large-scale data collection and analysis.

  • What is Chronic Wasting Disease (CWD)?

    What is Chronic Wasting Disease (CWD)?

    Why in the News?

    A case of Chronic Wasting Disease (CWD) was confirmed in the US.

    About Chronic Wasting Disease (CWD)

    • CWD is a fatal, transmissible disease that affects the brain and central nervous system of deer, elk, and moose.
    • First identified in 1967, CWD is a prion disease where normal proteins misfold, leading to symptoms that eventually cause death.
    • Transmission occurs through animal-to-animal contact or contamination of feed or water by infected saliva or bodily waste.
    • Environmental contamination can occur through soil exposure from infected carcasses or bodily fluids.
    • High-risk areas include places where deer and elk gather closely, like feeding or watering sites.
    • Species affected: CWD does not naturally infect cows, other livestock, or pets.
    • Although no strong evidence exists that it can spread to humans, officials advise against eating meat from infected animals.

    Symptoms of CWD:

    • Symptoms: Drastic weight loss, lack of coordination, drooling, listlessness, and excessive thirst. Infected animals may also show drooping ears and lose their fear of humans.
      • Prevention: To prevent the spread of CWD, avoid handling or eating sick animals, use synthetic lures, dispose of carcass waste in landfills, and report any sick or unusual deer to local wildlife authorities.

    PYQ:

    [2012] Vultures which used to be very common in Indian countryside some years ago are rarely seen nowadays. This is attributed to:

    (a) The destruction of their nesting sites by new invasive species

    (b) A drug used by cattle owners for treating their diseased cattle

    (c) Scarcity of food available to them

    (d) A widespread, persistent and fatal disease among them

  • How Tardigrades are able to resist high levels of radiation?

    Why in the News?

    • A team of researchers has discovered the genetic mechanisms that allow a newly identified tardigrades species—Hypsibius henanensis—to withstand high levels of radiation.

    About Tardigrades

    • Tardigrades, often called “water bears” or “moss piglets,” are tiny, water-dwelling microorganisms known for their remarkable ability to survive extreme conditions.
    • They can withstand environments that would be lethal for most life forms, including:
      • Extremely high and low temperatures (from near absolute zero to over 150°C),
      • High levels of radiation and vacuum conditions found in space,
      • Extreme dehydration (losing nearly all water in their bodies),
      • High pressures (up to six times that of the ocean’s deepest trenches).
    • This adaptability makes them a subject of interest for scientists, especially in understanding survival mechanisms in extreme conditions.

    How Tardigrades resist High Radiations?

    The researchers identified 2,801 genes involved in DNA repair. Three key factors contributing to radiation tolerance include:

    • DNA Repair Protein (TRID1): Enabled the species to repair double-strand DNA breaks due to radiation.
    • Gene Activation for Mitochondrial Proteins: Radiation exposure activated a gene that produced two proteins vital for mitochondrial synthesis and DNA repair.
    • Antioxidant Pigments (Betalains): These pigments neutralize harmful chemicals generated by radiation within cells.

  • Betelgeuse, one of the Brightest Stars predicted to Explode

    Recent research has revealed a surprising finding about Betelgeuse (which was believed to explode): the star’s unusual brightening and dimming patterns may be influenced by an unseen companion star.

    Why in the News?

    Recent research has revealed a surprising finding about Betelgeuse (which was believed to explode): the star’s unusual brightening and dimming patterns may be influenced by an unseen companion star.

    About Betelgeuse

    • Betelgeuse is a red supergiant star in the Orion constellation, marking Orion’s left shoulder.
    • It is among the brightest and largest stars visible in the night sky, located about 650 light-years from Earth.
    • The star is nearing the end of its life, and when it dies, its explosion is expected to be visible during the day for several weeks.
    • Betelgeuse is vast, measuring more than 700 million miles (1.2 billion kilometers) in diameter.
    • Known for its periodic dimming and brightening, Betelgeuse has two distinct pulsation cycles:
      • A short-term cycle of about one year.
      • A longer six-year cycle called a long secondary period.
    • Researchers believe this longer cycle may be caused by Betelbuddy (an unseen companion star) moving through the dust surrounding Betelgeuse.

    Indicators and Scientific Evidence

    • Betelgeuse’s cyclic dimming and brightening patterns indicate it is nearing the end of its life.
    • Its massive size and expansion as a red supergiant suggest it is in a late stellar stage.
    • Cooling surface temperature and mass loss through stellar winds signal increasing instability.
    • Spectral analysis shows heavy elements in Betelgeuse’s layers, typical of late-stage fusion.
    • An unseen companion star, or “Betelbuddy,” may be influencing its brightness and internal structure.

    Potential Effects of Betelgeuse’s Supernova on Earth and Our Solar System

    • Betelgeuse’s supernova will likely be visible in daylight for weeks and brighter than the Moon at night.
    • At 650 light-years away, dangerous radiation would dissipate before reaching Earth, posing no harm.
    • Space missions and satellites may experience minor interference from increased cosmic rays.
    • The explosion will enrich the interstellar medium with heavy elements, contributing to new star formation.
    • The supernova will provide valuable scientific insights into stellar life cycles and cosmic element formation.

    PYQ:

    [2017] The terms ‘Event Horizon’, ‘Singularity’, ‘String Theory’ and ‘Standard Model’ are sometimes seen in the news in the context of:

    (a) Observation and understanding of the Universe

    (b) Study of the solar and the lunar eclipses

    (c) Placing satellites in the orbit of the Earth

    (d) Origin and evolution of living organisms on the Earth

  • Boeing 737’s ‘defective’ Rudder System

    Boeing 737’s ‘defective’ Rudder System

    Why in the News?

    • Certain variants of the Boeing 737, equipped with a rollout guidance actuator, are being investigated due to concerns about a potential jammed or restricted rudder control system.

    What is a Rudder?

    • The rudder is like the steering tool for an airplane.
    • It’s part of the tail and helps the plane move left or right, similar to how a boat’s rudder steers on water.
    • It’s important for making turns, landing in windy conditions, and keeping the plane going straight, especially if one of the engines fails.

    What does a Rudder Rollout Guidance Actuator do?

    • It is a special device that helps the plane control its direction during landings when the plane is flying automatically with the autopilot.
    • It’s especially useful during landings in bad weather with poor visibility, making sure the plane stays on the correct path on its own.

    Why are certain Boeing 737 Planes being checked?

    • Some Boeing 737 planes are being inspected because of a possible problem with their rudder system, which helps steer the plane during landing.
    • An issue came up after a United Airlines flight in February 2024 had a situation where the rudder got stuck during landing, and the pilots had to work harder to control the plane.
    • Investigators found that a part called the rudder rollout guidance actuator might have moisture and corrosion problems, which can cause the rudder to jam.
    • This problem might affect a small number of Boeing 737 planes that use this system for automatic landings in bad weather.

  • Moonlight Programme

    Why in the News?

    The European Space Agency (ESA) launched its Moonlight Lunar Communications and Navigation Services (LCNS) Programme.

    About Moonlight Programme

    Details
    Agency European Space Agency (ESA)
    Purpose To establish a communications and navigation infrastructure around the Moon to support future lunar missions by space agencies and private companies.
    Planned Missions Supports over 400 moon missions planned over the next 20 years.
    Satellite Constellation Deployment of 5 lunar satellites to provide communication and navigation services.
    Data Transfer Range Enables data transfer between Earth and the Moon over a distance of 400,000 km.
    First Satellite Lunar Pathfinder, a communications relay satellite built by Surrey Satellite Technology Ltd, is set to launch in 2026.
    Operational Timeline Initial services expected to begin by 2028, with full operational capability by 2030.
    Primary Focus Area Coverage around the Moon’s South Pole, an area of high interest due to favorable lighting conditions and potential water ice presence in permanently shadowed craters.
    Global Collaboration Collaboration with NASA and JAXA (Japanese Space Agency) as part of LunaNet for standardizing lunar mission communications and navigation.
    Significance – Enables over 400 lunar missions
    – Supports NASA’s Artemis programme
    – Provides continuous all-weather connectivity for lunar missions
    – Focuses on the South Pole for ice deposits
    – Reduces costs by sharing infrastructure
    – Technological advancements for Mars missions (MARCONI)
    Strategic Advantage Enhances ESA’s role in global lunar exploration and contributes to the future of commercial lunar activities.

  • West Nile Virus

    Why in news?

    Ukraine is currently dealing with a serious outbreak of West Nile virus (WNV), with health officials raising alarms as the death toll rises.

    About West Nile Virus

    Details
    Virus Type Member of the flavivirus genus, family Flaviviridae
    First Isolated 1937 in a woman in the West Nile district of Uganda
    Geographical Distribution Commonly found in Africa, Europe, Middle East, North America, and West Asia
    Transmission Primarily transmitted through infected mosquito bites; mosquitoes become infected by feeding on infected birds. Can also spread through infected animal tissues.
    Symptoms – Asymptomatic: ~80% of infected individuals show no symptoms
    – West Nile Fever: ~20% develop symptoms like fever, headache, fatigue, body aches, nausea, vomiting, and occasional skin rash.
    Peak Infection Period Typically spikes between June and September (summer to autumn)
    Reported Outbreaks 19 countries have reported outbreaks, including Albania, Austria, Bulgaria, Croatia, Cyprus, Czechia, France, Germany, Greece, Hungary, Italy, North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Türkiye, and Kosovo.
    Treatment No vaccine available; supportive treatments provided for neuroinvasive WNV patients

     

    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

  • Drugs Technical Advisory Board (DTAB)

    Why in the News?

    The Drugs Technical Advisory Board (DTAB), the highest statutory body on technical drug-related matters in India, has recommended including all antibiotics under the definition of ‘New Drugs’ in the New Drugs and Clinical Trial (NDCT) Rules, 2019.

    What are ‘New Drugs’?

    • According to Rule 122 E of the Drugs and Cosmetics Rules, 1945, a new drug is one that:
      • Has not been used in the country.
      • Has not been recognized as effective and safe by the licensing authority.
      • May also be an already approved drug with modified claims such as new indications, dosages, or routes of administration.

    Implications of Including Antibiotics in the New Drug Category:

    • If antibiotics are classified as new drugs:
      • Their manufacturing, marketing, and sale will be documented.
      • Clearance for manufacturing and marketing will need to be obtained from the Central government instead of State drug administrations.
      • Antibiotics will only be sold to patients on prescription.

    Additional Recommendations:

    • The board is considering amending the labelling rules under the Drugs Rules, 1945, by adding a blue strip or box for antimicrobial products.
    • It has recommended that antimicrobials should not be sold to non-pharmaceutical industries unless they have the necessary licences.

    About the Drugs Technical Advisory Board:

    Details
    Authority Highest statutory decision-making body on technical matters related to drugs in India
    Establishment Constituted under the Drugs and Cosmetics Act, 1940
    Affiliation Part of the Central Drugs Standard Control Organization (CDSCO)
    Nodal Ministry Ministry of Health and Family Welfare
    Functions – Advises the Central and State Governments on technical matters related to the Drugs and Cosmetics Act
    – Carries out functions assigned by the Act
    Role of CDSCO – Approval of drugs
    – Conduct of clinical trials
    – Establishing standards for drugs
    – Quality control of imported drugs
    – Coordination with State Drug Control Organizations
    Specialized Licenses Responsible for granting licenses for critical categories of drugs, including blood products, IV fluids, vaccines, and sera
    Decision-Making Provides expert advice and technical recommendations to ensure drug safety, efficacy, and quality

     

    PYQ:

    [2019] Which of the following are the reasons for the occurrence of multi-drug resistance in microbial pathogens in India?

    1. Genetic predisposition of some people
    2. Taking incorrect doses of antibiotics to cure diseases
    3. Using antibiotics in livestock farming
    4. Multiple chronic diseases in some people

    Select the correct answer using the code given below.

    (a) 1 and 2
    (b) 2 and 3 only
    (c) 1, 3 and 4
    (d) 2, 3 and 4

  • How did the Haber-Bosch process change the world?

    Why in the News?

    One hundred million tonnes of nitrogen are extracted from the atmosphere and transformed into fertilizer through the Haber-Bosch process, adding 165 million tonnes of reactive nitrogen to the soil.

    What is the Nitrogen molecule and how is it availed in Nature?

    • The nitrogen molecule (N2) consists of two nitrogen atoms joined by a triple bond, sharing three pairs of electrons. This triple bond makes the molecule extremely stable and nearly inert, requiring a significant amount of energy (946 kJ/mol) to break.
      • When the triple bond is broken, nitrogen atoms can form reactive nitrogen compounds like ammonia (NH3), ammonium (NH4+), or nitrates (NO3–). 
      • These compounds are essential for plant growth as they help synthesize enzymes, proteins, and amino acids.
    • Lightning generates enough energy to break the N2 triple bond, producing nitrogen oxides (NO and NO2) that can combine with water vapor to form nitric and nitrous acids. These acids add reactive nitrogen to the soil through rainfall.
    • Certain bacteria, such as Azotobacter and Rhizobia, fix atmospheric nitrogen through biological processes.
      • Rhizobia forms symbiotic relationships with legumes, while Azolla, an aquatic fern, also fixes nitrogen via its symbiotic cyanobacterium.

    The Haber-Bosch process synthesizes ammonia by reacting nitrogen (N2) with hydrogen (H2) under high pressure (200 atm) and moderate temperature (200°C), using a catalyst (typically iron oxides).

    What is the Haber-Bosch process?

    • The Haber-Bosch process synthesizes ammonia by reacting nitrogen (N2) with hydrogen (H2) under high pressure (200 atm) and moderate temperature (200°C), using a catalyst (typically iron oxides).
    • The process was developed by Fritz Haber, who found that high pressure and a suitable catalyst were key to converting nitrogen to ammonia efficiently. The setup was scaled up by Carl Bosch, leading to the first ammonia production plant in 1913.

    What are the downsides of fertilizers?

    • Environmental Impact: While synthetic nitrogen fertilizers have significantly increased food production, they have also led to negative environmental effects:
      • Over-fertilization: Excess nitrogen application results in reactive nitrogen being released into the atmosphere, contributing to acid rain and soil degradation.
      • Water Pollution: Nitrogen runoff from agricultural fields enters freshwater and coastal ecosystems, leading to eutrophication, which causes oxygen depletion and harms aquatic life.
      • Human Health Concerns: High nitrogen levels in drinking water can pose health risks.
    • Socio-Economic Challenges: Despite increased food production, issues such as starvation, malnutrition, and unequal food distribution persist, highlighting that technological solutions like fertilisers are insufficient; social and political action is also needed.

    Way forward: 

    • Promote Sustainable Fertilizer Use: Encourage the adoption of precision agriculture techniques, such as soil testing and site-specific nutrient management, to optimize fertilizer application. This approach minimizes over-fertilization, reduces nitrogen runoff, and mitigates environmental damage.
    • Strengthen Policy and Regulatory Frameworks: Governments should implement and enforce policies to regulate nitrogen fertilizer use, ensuring that environmental safety standards are met.