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Type: Prelims Only

  • Radiometric Dating using Calcium-41       

    Central Idea: A recent study has shown that Calcium-41 can be used in a similar way as Carbon-14 in carbon dating, but with several advantages.

    Carbon Dating and its limitations

    • Carbon-14 is an unstable and weakly radioactive isotope of carbon.
    • It has a half-life of 5,700 years and is used to estimate the age of carbon-based materials.
    • Radiocarbon dating provides objective age estimates for materials from living organisms.
    • Carbon-14 cannot determine the age of objects older than approximately 50,000 years.
    • Three techniques are used to measure carbon-14 content: gas proportional counting, liquid scintillation counting, and accelerator mass spectrometry.

    Introducing Calcium-41

    • Calcium-41 is a rare long-lived radioisotope of calcium with a half-life of 99,400 years.
    • It is produced through cosmic ray interactions in the soil and is found in the Earth’s crust.
    • Calcium-41 occurs less frequently than carbon-14.

    Method used: Atom Trap Trace Analysis (ATTA)

    • ATTA is a technique proposed by researchers at the University of Science and Technology of China.
    • It is based on laser manipulation and detection of neutral atoms.
    • The sample is vaporized, and the atoms are laser-cooled and loaded into a light and magnetic field cage.
    • By tuning the laser’s frequency, Calcium-41 atoms can be detected through electron transitions.

    Significance and Applications

    • ATTA can detect one Calcium-41 atom in every 10^16 calcium atoms in seawater with 12% precision.
    • It is selective and avoids confusion with potassium-41 atoms.
    • ATTA can be adapted to study other isotopes, such as argon-39, krypton-81, and krypton-85.
    • The applications of ATTA and Calcium-41 include dating rocks covered by ice and exploring Earth-science applications.

     

    Also read:

    What is Carbon Dating? How does it work?

     

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  • Understanding a Human Pangenome Map

    pangenome

    Central Idea

    • A study published in the Nature journal presents a pangenome reference map built using genomes from 47 anonymous individuals.
    • The individuals included in the study are from various regions, including Africa, the Caribbean, Americas, East Asia, and Europe.

    Understanding Genomes and Reference Genomes

    • The genome refers to the collection of all genes and regions between genes found in our chromosomes.
    • Each chromosome is composed of millions of nucleotides (A, T, G, and C) arranged in different combinations.
    • Genome sequencing helps understand genetic diversity and susceptibility to diseases.
    • A reference genome is a map used to compare newly sequenced genomes and identify differences.
    • The first reference genome, created in 2001, had limitations and did not represent human diversity accurately.

    What is Pangenome Map?

    • The new study focuses on building a pangenome map, which is a graph representing genetic diversity among individuals.
    • Pangenome maps use long-read DNA sequencing technologies to assemble sequences accurately.

    Importance of Pangenome Map

    • Although humans are more than 99% similar in their DNA, there is still a 0.4% difference between individuals.
    • A complete and error-free pangenome map helps understand genetic differences and human diversity.
    • It aids in identifying genetic variants linked to health conditions, such as the discovery of 150 new genes associated with autism.
    • The current pangenome map lacks representation from certain populations, including Indians.

    Implications for Indian Genomes

    • The pangenome map, despite not including Indian genomes, will assist in mapping Indian genomes against existing reference genomes.
    • Future pangenome maps with Indian genome data will provide insights into disease prevalence, rare gene discovery, diagnostic methods, and drug development.

     

    Key Terminologies

    Genome: The complete set of genes and regions between genes in an organism.

    Reference Genome: A map used to compare newly sequenced genomes and identify differences.

    Pangenome: A graph representing genetic diversity among individuals rather than a linear sequence.

    Nucleotides: The building blocks of DNA (A, T, G, C).

    Long-Read DNA Sequencing: A technology that produces longer and contiguous DNA strands for more accurate sequencing.

     

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  • In news: Neh Pema Shelphu Shrine

    neh pema

    Central Idea

    • The landowner of a disputed area in Arunachal Pradesh has demanded either compensation from Army for a land where Army has built Gurdwara near the Neh Pema Shelphu Shrine.

    Neh Pema Shelphu Shrine

    • It is a holy shrine located in the Mechukha Valley of Arunachal Pradesh.
    • It holds significant religious importance for the local Memba Buddhist community.
    • The shrine is believed to have been sanctified by Guru Padmasambhava, a prominent figure in Tibetan Buddhism, during his exploration of the area in the 8th century AD.
    • It has been a place of worship and pilgrimage for the Memba people since 1274 AD, according to historical records.
    • It attracts hundreds of Buddhists who visit the shrine annually during a pilgrimage in March.

    Why in news?

    • The Shiromani Gurdwara Parbandhak Committee claimed the shrine associated with Guru Nanak Dev, the first Sikh Guru, in Arunachal Pradesh has been turned into a Buddhist shrine.

     

     

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  • What are Global Depository Receipts (GDRs)?

    Central Idea: Tata Consumer Products has announced its decision to delist its global depository receipts (GDRs) from the London Stock Exchange and Luxembourg Stock Exchange.

    What are GDRs?

    • GDRs are financial instruments used by companies to raise capital from international investors.
    • They represent a bundle of shares in the company and are typically listed and traded on international stock exchanges.
    • GDRs provide a way for companies to access global capital markets and attract investments from foreign investors without directly listing their shares on multiple stock exchanges around the world.

    GDR Regulation in India

    • In India, GDRs can be issued by Indian companies that meet the eligibility criteria set by the SEBI.
    • SEBI sets guidelines and regulations for companies wishing to issue GDRs typically include the following:
    1. Listing: The company must be listed on a recognized stock exchange in India.
    2. Track Record: The company should have a track record of profitability for a certain period as specified by SEBI.
    3. Good Corporate Governance: The company must comply with corporate governance norms and disclose relevant financial and non-financial information.
    4. Regulatory Compliance: The company must comply with all applicable laws and regulations, including those related to securities and foreign exchange.
    5. Approval from Regulatory Authorities: The company needs to obtain necessary approvals from SEBI and other relevant authorities for the issuance of GDRs.

    Need for GDR

    • Capital Raising: GDRs offer a means for companies to raise capital from international investors, helping them finance investments, expansion projects, acquisitions, or debt repayment.
    • Global Investor Base: GDRs allow companies to access a diverse range of international investors, including institutional investors, hedge funds, and retail investors, thereby expanding their shareholder base.
    • Cost Efficiency: GDRs can be a cost-effective alternative to traditional methods of listing shares on multiple exchanges, as they enable companies to tap into global capital markets without the need for separate listings in different countries.
    • Simplified Trading and Settlement: GDRs facilitate easy trading and settlement for international investors, as they eliminate the need to navigate local market regulations and procedures.
    • Risk Mitigation: GDRs can provide a degree of risk mitigation for companies by reducing their exposure to local market fluctuations and volatility, as they offer access to a more diversified investor base.
    • Arbitrage Opportunities: GDRs can create arbitrage opportunities for investors who can exploit price discrepancies between the GDRs and the underlying shares listed on the domestic stock exchange.

    Benefits offered

    • Access to Global Capital: GDRs enable Indian companies to access a larger pool of international capital and diversify their funding sources beyond domestic markets.
    • Increased Liquidity: Listing GDRs on international exchanges provides Indian companies with broader exposure and enhances the liquidity of their shares, as they become accessible to a wider range of investors.
    • Enhanced Global Visibility: GDRs help raise the profile of Indian companies on a global scale, increasing their visibility and attracting the attention of international investors and analysts.
    • Currency Diversification: GDRs can also provide an opportunity for Indian companies to diversify their exposure to foreign currencies, as GDRs are often denominated in a currency other than the company’s home currency.

     

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  • Arsenic Contamination in India

    arsenic

    Central Idea: A recent peer-reviewed study suggests that even low levels of arsenic consumption can affect cognitive function in children, adolescents, and young adults.

    Arsenic Contamination

    • Arsenic is a highly toxic element naturally present in the environment.
    • Contaminated water, particularly groundwater, is a major source of arsenic exposure.
    • Long-term arsenic exposure can lead to various health issues, including cancer, skin lesions, cardiovascular disease, and negative impacts on cognitive development.

    Menace in India

    • Arsenic contamination in groundwater is one of the most crippling issues in the drinking water scenario of India.
    • According to the latest report of the Central Ground Water Board (CGWB), 21 states across the country have pockets with arsenic levels higher than the BIS stipulated permissible limit of 0.01 milligram per litre (mg/l).
    • The states along the Ganga-Brahmaputra-Meghna (GBM) river basin — Uttar Pradesh, Bihar, Jharkhand, West Bengal and Assam — are the worst affected by this human-amplified geogenic occurrence.
    • In India, arsenic contamination was first officially confirmed in West Bengal in 1983.
    • Close to four decades after its detection, the scenario has worsened.
    • About 9.6 million people in West Bengal, 1.6 million in Assam, 1.2 million in Bihar, 0.5 million in Uttar Pradesh and 0.013 million in Jharkhand are at immediate risk from arsenic contamination in groundwater.

    Key findings of the recent study

    (1) Arsenic impact on behaviour

    • The study found that individuals exposed to arsenic had reduced grey matter and weaker connections within key regions of the brain associated with cognitive functions.
    • Chronic exposure to arsenic could have significant consequences at a population level, leading to increased school failures, diminished economic productivity, and higher risks of criminal and antisocial behavior.

    (2) Arsenic Exposure and Socioeconomic Factors

    • As previous studies have shown, arsenic exposure is particularly harmful to the poor.
    • The recent study reaffirms that economically and nutritionally disadvantaged individuals experience greater cognitive impairment from arsenic exposure.
    • The impact of arsenic on impairing cognition is more pronounced at a collective level rather than at an individual level.

    Government Initiatives to address Arsenic Contamination

    • Governments in Bihar and West Bengal have taken steps to address arsenic contamination since the 1990s.
    • Strategies include promoting piped water access, installing arsenic removal plants, and encouraging groundwater extraction from deeper aquifers with lower arsenic levels.
    • The goal is to minimize arsenic exposure and mitigate its health impacts in affected regions.

    Possible solutions

    Some of the management options include

    • Uses of surface water sources
    • Exploring and harnessing alternate arsenic-free aquifer
    • Removal of arsenic from groundwater using arsenic treatment plants/filters
    • Adopting rainwater harvesting/ watershed management practices.

     

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  • Credit cards put under Liberalised Remittance Scheme (LRS)

    Central Idea: The Centre has amended rules under Foreign Exchange Management Act (FEMA) Rules, bringing international credit card spends under the Liberalised Remittance Scheme (LRS).

    Changes introduced

    • Credit card spends outside India now fall under the LRS, allowing for the application of a higher TCS rate.
    • The amendment removes the exclusion of credit card transactions from the LRS, which was previously covered under Rule 7 of the Foreign Exchange Management (Current Account Transaction) Rules, 2000.
    • The changes do not apply to payments for the purchase of foreign goods/services from India.

    What is Liberalised Remittance Scheme (LRS)?

    • LRS is a facility provided by the Reserve Bank of India (RBI) to resident individuals to remit funds abroad for permitted current or capital account transactions or a combination of both.
    • The scheme was introduced in 2004 and has been periodically reviewed and revised by the RBI.
    • Under the scheme, resident individuals can remit up to a certain amount in a financial year for permissible transactions including education, travel, medical treatment, gifts, and investments in equity and debt securities, among others.
    • The limit for LRS is currently set at USD 250,000 per financial year.

    Eligibility for LRS

    • LRS is open to everyone including non-residents, NRIs, persons of Indian origin (PIOs), foreign citizens with PIO status and foreign nationals of Indian origin.
    • The Scheme is NOT available to corporations, partnership firms, Hindu Undivided Family (HUF), Trusts etc.

    Benefits provided by LRS

    • LRS is an easy process that anyone can use to transfer money between two countries.
    • It’s especially useful for businesses because they can use it to transfer funds to India, and investors can receive their investments back home.
    • LRS also has some added benefits, like fast transfer timing and no issues with exchange rates.

    Concerns with credit card spends

    • The amendment aims to achieve parity between the usage of credit and debit cards, which were already covered under the LRS.
    • Instances of disproportionately high LRS payments compared to disclose incomes prompted the amendment.
    • Business visits of employees, where costs are borne by the employer, are not covered under the LRS.
    • The data collected from major money remitters under the LRS indicated that international credit cards were being issued with limits exceeding the prescribed norm.

    Exclusions and impact of the Scheme

    • The government assured that the LRS scheme would not cover genuine business visits abroad by employees.
    • The imposition of a 20% tax collection on source (TCS) for foreign remittances would primarily affect tour travel packages, gifts to non-residents, and domestic high net-worth individuals investing in assets like real estate, bonds, and stocks outside India.
    • The Ministry emphasized that the 5% TCS levied on medical or education expenses abroad, allowed up to ₹7 lakh per year, and would remain unchanged.

  • RBI regulations on Green Deposits

    Central Idea: The Reserve Bank of India (RBI) has introduced a regulatory framework to govern the acceptance of green deposits by banks, ensuring transparency and accountability in their investments.

    What are Green Deposits?

    • Green deposits are financial products offered by banks that are similar to regular deposits, but the money received is specifically earmarked for environmentally friendly projects.
    • These deposits support projects aimed at combating climate change, such as renewable energy initiatives, while avoiding investments in activities that harm the environment, like fossil fuel projects.
    • They are part of a broader range of financial products, including green bonds and green shares that enable investors to contribute to environmentally sustainable projects.

    Regulatory framework for accepting Green Deposits

    • The RBI’s framework mandates that banks establish a set of rules or policies, approved by their respective Boards, to guide the investment of green deposits.
    • These rules must be made public on the banks’ websites, ensuring transparency and enabling customers to make informed decisions.
    • Banks are required to disclose information on the amount of green deposits received, how these funds are allocated to different green projects, and the environmental impact of such investments.
    • To verify the banks’ claims and the sustainability credentials of the projects, a third-party is appointed to conduct independent verification.

    Sectors eligible for green deposits

    • The RBI has identified a list of sectors classified as sustainable, which are eligible to receive green deposits.
    • These sectors include renewable energy, waste management, clean transportation, energy efficiency, and afforestation.
    • Banks are prohibited from investing green deposits in sectors considered detrimental to the environment, such as fossil fuels, nuclear power, tobacco, gambling, palm oil, and hydropower generation.

    Addressing greenwashing

    • Greenwashing refers to the practice of making misleading claims about the positive environmental impact of an activity or investment.
    • The RBI’s regulatory framework aims to prevent greenwashing in the banking sector by ensuring that the actual impact of green deposits is accurately represented.
    • By requiring transparency, disclosure, and third-party verification, the framework aims to protect customers from deceptive practices and ensure genuine environmental benefits.

    Impact and controversies

    • Depositors who prioritize environmental concerns may find satisfaction in investing their money in environmentally sustainable products like green deposits.
    • However, some critics argue that green investment products may primarily serve to make investors feel good without generating significant environmental benefits.
    • Additionally, the range of projects available for investment through green deposits may be limited, posing challenges in achieving broad environmental impact.

    Key challenge: Assessing environmental sustainability

    • Evaluating the true environmental sustainability of a project can be challenging in a complex world with interconnected systems and second-order effects that are difficult to anticipate.
    • It is essential to consider the indirect consequences and long-term effects of actions to determine if a project genuinely contributes to environmental sustainability.
    • Uncertainty surrounding the actual environmental impact of green projects highlights the need for rigorous evaluation and ongoing monitoring to ensure the desired outcomes are achieved.

     

     

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  • Quantum Biology: Unveiling the Quantum Secrets of Life

    biology

    Central Idea: The article introduces the concept of quantum biology, which explores the influence of quantum effects on living systems.

    Nature and Quantum Mechanics

    • Quantum effects refer to phenomena that occur between atoms and molecules that cannot be explained by classical physics.
    • Quantum mechanics, which governs the behavior of objects at atomic scales, differs from classical mechanics, leading to counterintuitive phenomena like particle tunnelling and superposition.

    Quantumness in Biology

    • Quantum biology is an emerging field that explores the role of quantum mechanics in biological processes and living systems.
    • It investigates how quantum phenomena and effects, which typically occur at atomic and subatomic scales, influence and contribute to the functioning and behavior of biological systems.
    • It aims to uncover and understand the quantum nature of biological molecules, processes, and interactions.
    • It seeks to study how quantum mechanics may impact various biological phenomena such as photosynthesis, enzyme reactions, and navigation in birds.

    Evidence of Quantum Effects in Biology

    • Research on chemical reactions in biomolecules like proteins and genetic material suggests the influence of quantum effects.
    • Nanoscopic quantum effects can drive macroscopic physiological processes, including enzyme activity, sensing magnetic fields, cell metabolism, and electron transport.

    Studying Quantum Biology

    • Studying quantum effects in biology requires tools to measure short time scales, small length scales, and subtle differences in quantum states.
    • Researchers can apply tailored magnetic fields to control the spins of electrons, influencing physiological processes that respond to magnetic fields.

    Potential applications

    • Therapeutic devices: Understanding and fine-tuning quantum properties in nature could lead to non-invasive, remotely controlled therapeutic devices accessible through mobile phones.
    • Bio-manufacturing: Electromagnetic treatments based on quantum principles could be used for disease prevention and treatment, such as brain tumors, as well as in bio-manufacturing.

    Scope quantum biology’ study

    • Multi-disciplinary: Quantum biology is an interdisciplinary field that brings together researchers from various disciplines, including quantum physics, biophysics, medicine, chemistry, and biology.
    • Many applications: Collaboration and cross-disciplinary research are crucial for advancing quantum biology and unlocking its transformative potential in biology, medicine, and technology.

     

    Facts for Prelims

    Superposition: A quantum phenomenon where particles can exist in multiple states simultaneously until measured or observed, in contrast to classical physics where objects have definite properties.

    Spins: Quantum properties of electrons that define their interaction with magnetic fields, analogous to the way charge defines their interaction with electric fields.

    Deterministic Codebook: A comprehensive understanding of the relationship between quantum causes and physiological outcomes, providing a guide for mapping quantum phenomena to specific biological effects.

     

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  • DoT develops Facial Recognition Tool ‘ASTR’

    astr

    Central Idea: The Department of Telecommunications (DoT) has developed an artificial-intelligence-based facial recognition tool called Artificial Intelligence and Facial Recognition powered Solution for Telecom SIM Subscriber Verification (ASTR).

    What is ASTR?

    • ASTR is designed to check subscriber databases of telecom operators to identify multiple connections associated with the same person.
    • The goal of ASTR is to detect and block fraudulent mobile connections, thereby reducing cyber frauds.

    Development of ASTR

    • In 2012, DoT issued an order requiring telecom operators to share their subscriber database, including users’ pictures, with the department.
    • These images serve as the core database for facial recognition using ASTR.
    • The ASTR project was conceptualized and designed by the DoT’s unit in Haryana between April 2021 and July 2021.
    • A pilot project was conducted in Haryana’s Mewat region to test the feasibility of ASTR, where a significant number of fraudulent SIMs were detected.

    How ASTR works?

    • ASTR uses convolutional neural network (CNN) models to encode human faces in subscribers’ images, accounting for various factors like face tilt, angle, image opaqueness, and dark color.
    • A face comparison is performed for each face against all faces in the database, grouping similar faces under one directory.
    • ASTR considers two faces to be identical if they match to a minimum extent of 97.5%.
    • It can detect all SIMs associated with a suspected face within 10 seconds from a database of 1 crore (10 million) images.
    • After matching faces, ASTR’s algorithm utilizes “fuzzy logic” to find approximate matches for subscriber names, considering variations, typographical errors, and related results.

    Impact and Results

    • In the first phase, ASTR analyzed over 87 crore (870 million) mobile connections and detected more than 40 lakh (4 million) cases of people using a single photograph to obtain multiple connections.
    • After verification, over 36 lakh (3.6 million) connections were discontinued by telecom operators.
    • The list of fraudulent connections is also shared with banks, payment wallets, and social media platforms to disengage these numbers from their respective platforms.
    • WhatsApp collaborated with the government to disable accounts created using such numbers, and similar efforts are being made with other social media platforms.

    Facts for Prelims

    Convolutional Neural Network (CNN): A type of deep learning algorithm commonly used for image recognition tasks, where it extracts features and patterns from images by applying convolution operations.

    Fuzzy Logic: A form of logic that deals with approximate or qualitative reasoning rather than strict binary true/false values. In the context of ASTR, it is used to find similarity or approximate matches for subscriber names, accounting for variations and typographical errors.

     

     

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  • India’s export of Russian oil to West

    oil

    Central Idea

    • The article discusses India’s increased imports of Russian oil and the potential circumvention of sanctions imposed on Russian oil products.

    Why in news?

    • An EU parliamentarian accused India of profiting from cheaply bought Russian oil and indirectly supporting the Russian economy.
    • India justified its purchase by emphasizing its energy demands and the challenges of higher prices due to its reliance on energy imports and significant poverty levels.

    Reasons: Sanctions against Russian Oil

    • After Russia’s invasion of Ukraine, Western countries and Europe aimed to reduce their dependency on Russian energy imports to weaken the Russian economy.
    • Measures were taken, such as Germany suspending the launch of the Nord Stream natural gas pipeline and Canada and the US banning the import of Russian crude oil.
    • Stricter sanctions were imposed on Russia, including a “price cap” from trading Russian oil above $60 per barrel.
    • The price cap aimed to cripple Moscow’s economy and limit its ability to fund the war in Ukraine.
    • However, Russia increased its oil exports to India and China as a response.

    India’s role in meeting West’s energy demand

    • India, exempt from the sanctions on Russian oil, has seen a significant increase in fuel imports from Russia, which is then refined and supplied to Europe and the US.
    • The refined oil from Russian crude, once processed in India, is not considered of Russian origin.
    • India’s oil imports have helped it meet its own energy demands and also assist Western nations facing energy crises due to the Russia-Ukraine conflict.
    • India has become a net exporter of refined petroleum products, supplying the West to alleviate current energy shortages.

    Impact of Indian imports on Western markets

    • Indian refiners have ramped up exports of refined petroleum products, including diesel and vacuum gas oil (VGO), to Europe and the US.
    • VGO is a feedstock in the refining process that can be further processed to produce gasoline, diesel, and other fuel products.
    • Diesel exports to Europe from India have increased by 12-16% in the last fiscal year.
    • The US has become a major recipient of Indian VGO shipments, receiving 11,000-12,000 barrels per day (bpd) or 65-81% of India’s VGO exports.
    • These exports from India have helped ease the energy tightness and supply constraints in Western markets.

     

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