Scientists have found the skull of a 99-million-year-old flying dinosaur that is tinier than the tiniest bird known to humans.
- The bird-like dinosaur was found stuck in a gob of tree resin that eventually hardened into amber, preserving it for millions of years to come.
- The fossil was dug up in 2016 from a mine in Myanmar. It was so slight; it likely weighed just 2 grams.
- The dinosaur skull holds around 100 sharp teeth, which hints at its ferocious nature despite its small size.
- It even had teeth in the back of its jaw, under its eye.
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From UPSC perspective, the following things are important :
Prelims level: Sahyadri Megha
Mains level: Not Much
The University of Agricultural and Horticultural Sciences (UAHS), Shivamogga (K’taka) has developed ‘Sahyadri Megha’, a new red variety of paddy that is resistant to blast (a fungal disease) and rich in nutrients.
Sahyadri Megha
- It is a red variety of paddy that is resistant to blast disease and rich in nutrients.
- It was developed under the hybridization breeding method by cross-breeding the best among the ‘Jyothi’ variety with that of ‘Akkalu’, a disease-resistant and protein-rich paddy variety.
- The new variety will be notified under the Indian Seed Act 1966 shortly after which it will become part of the seed chain.
Key features
- The protein content in it is 12.48%, higher than the other red rice varieties grown.
- The yield per hectare from ‘Sahyadri Megha’ is around 65 quintals, substantially higher than other red paddy varieties.
- It is a medium-term paddy that can be grown when there is a delay in the onset of monsoon. It can be harvested after 120 days of sowing.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: SDGs, SDG India Index
Mains level: Ensuring sustainable development worldwide
Thirty-six major changes to the global indicator framework for the Sustainable Development Goals (SDGs) were approved and adopted by the UN Statistical Commission (UNSC).
Sustainable Development Goals
- The UN General Assembly in its 70thSession considered and adopted the Sustainable Development Goals (SDGs) for the next 15 years.
- The 17 SDGs came into force with effect from 1stJanuary, 2016.
- Though not legally binding, the SDGs have become de facto international obligations and have potential to reorient domestic spending priorities of the countries during the next fifteen years.
- Countries are expected to take ownership and establish a national framework for achieving these Goals.
- Implementation and success will rely on countries’ own sustainable development policies, plans and programmes.
About the changes
- These changes are based on the ‘2020 comprehensive review’ conducted by the UN Inter-Agency and Expert Group on SDG Indicators (IAEG-SDGs).
- The revised global framework will have 231 indicators, approximately the same number as in the original framework, the statement said.
- The global indicator framework was adopted by the UN General Assembly on July 6, 2017.
Eight additional indicators were added across six SDG goals — 2, 3, 4, 10, 13 and 16.
These include:
- Indicator 13.2.2 on the total greenhouse gas emissions per year for the SDG target 13.2 to integrate climate change measures into national policies, strategies and planning.
- Prevalence of anaemia in women aged 15-49 years, by pregnancy status (percentage) under the target 2.2 to end forms of malnutrition by 2030.
- A new indicator on reducing the percentage of bloodstream infections due to selected antimicrobial-resistant organisms has been added under the Global health goal (SDG 3).
- Indicator 10.7.3 on the number of migrants killed while attempting to cross maritime, land and air borders.
- Indicator 10.7.4 on the proportion of the population who are refugees, by country of origin.
Six indicators across six SDG goals — 1, 4, 8, 11, 13 and 17 — have been deleted.
These include:
- Indicator 1.a.1 on the proportion of domestically-generated resources allocated by the government directly to poverty reduction programmes.
- Indicator 4.2.1 on the proportion of children under five years of age who are developmentally on track in health, learning and psychosocial well-being, by sex.
- The portion of the indicator that measures progress for children between 0 and 23 months of age, which is currently in tier III was proposed for deletion by the IAEG.
- Under the SDG goal on combating climate change, the indicator 13.3.2, quantifying the number of countries that have communicated the strengthening of capacity-building for implementing adaptation, mitigation and technology transfer, and development actions has been deleted.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: AT-1 Bonds
Mains level: Read the attached story
India’s fourth-largest private lender YES bank was placed under a moratorium by RBI and its perpetual debt additional tier-1 (AT1 bonds) would become worthless if RBI does ask mutual funds to write down their value.
What are AT1 bonds?
- AT-1, short for Additional Tier-1 bonds, are a type of unsecured, perpetual bonds that banks issue to shore up their core capital base to meet the Basel-III norms.
- AT-1 bonds are complex hybrid instruments, ideally meant for institutions and smart investors who can decipher their terms and assess if their higher rates compensate for their higher risks.
- They carry a face value of ₹10 lakh per bond.
- There are two routes through which retail folk have acquired these bonds — initial private placement offers of AT-1 bonds by banks seeking to raise money; or secondary market buys of already-traded AT-1 bonds based on recommendations from brokers.
Why are they important?
AT-1 bonds have several unusual features lurking in their fine print, which make them very different from plain bonds.
- One, these bonds are perpetual and carry no maturity date. Instead, they carry call options that allow banks to redeem them after five or 10 years. But banks are not obliged to use this call option and can opt to pay only interest on these bonds for eternity.
- Two, banks issuing AT-1 bonds can skip interest payouts for a particular year or even reduce the bonds’ face value without getting into hot water with their investors, provided their capital ratios fall below certain threshold levels. These thresholds are specified in their offer terms.
- Three, if the RBI feels that a bank is tottering on the brink and needs a rescue, it can simply ask the bank to cancel its outstanding AT-1 bonds without consulting its investors. This is what has happened to YES Bank’s AT-1 bond-holders who are said to have invested ₹10,800 crore.
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From UPSC perspective, the following things are important :
Prelims level: Pyramid of Djoser
Mains level: NA
Last week, Egypt reopened the Pyramid of Djoser, the first pyramid ever built, after a 14-year restoration. The structure is believed to be designed by Imhotep, described by some as the first architect of the world.
The Pyramid of Djoser
- The 4,700-year-old pyramid is 60 metres tall, and consists of six stacked steps over a burial shaft tomb 28 metres deep and seven metres wide.
- It is located at the Saqqara archaeological site, 24 km southwest of Cairo, outside the royal capital of Memphis. A complex of halls and courts is located around the pyramid.
- It is the world’s oldest monumental stone building.
- Today a UNESCO world heritage site, the pyramid was constructed during the era of Pharaoh Djoser, the second king of Ancient Egypt’s Third Dynasty (2650 BC– 2575 BC).
- The Pharaoh’s 19-year reign saw significant technical innovations in stone architecture.
- The pyramid’s architect, Imhotep, was also a physician and astrologer, and served as Djoser’s minister.
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From UPSC perspective, the following things are important :
Prelims level: SAWEN, TRAFFIC, Red Panda
Mains level: Not Much
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According to a report by the TRAFFIC report, there has been a considerable reduction in the poaching of Red Panda (ailurus fulgens). The report also recommended trans-boundary law enforcement co-operation through the use of multi-government platforms like SAWEN (South Asia Wildlife Enforcement Network).
Red Panda
IUCN Red List Status: Endangered
- The red panda (Ailurus fulgens) is a mammal native to the eastern Himalayas and southwestern China.
- Its wild population is estimated at fewer than 10,000 mature individuals and continues to decline due to habitat loss and fragmentation, poaching, and inbreeding depression.
- Despite its name, it is not closely related to the giant panda
- The animal has been hunted for meat and fur, besides illegal capture for the pet trade.
- An estimated 14,500 animals are left in the wild across Nepal, Bhutan, India, China and Myanmar.
- About 5,000-6,000 red pandas are estimated to be present in four Indian states – Arunachal Pradesh, Meghalaya, Sikkim and West Bengal.
- The diminishing habitat is a major threat to the species which is a very selective feeder and survives on selected species of bamboos.
About South Asia Wildlife Enforcement Network (SAWEN)
- SAWEN is a Regional network is comprised of eight countries in South Asia: Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka.
- It aims at working as a strong regional intergovernmental body for combating wildlife crime by attempting common goals and approaches for combating illegal trade in the region.
- The South Asia region is very vulnerable to illegal traffic and wildlife crimes due to the presence of precious biodiversity and large markets as well as traffic routes for wildlife products in the south East Asian region.
- The collaboration in harmonizing as well as enforcing the wildlife protection in the region is considered very important for effective conservation of such precious biodiversity.
- India adopted the Statute of the SAWEN and became its formal member in 2016.
Back2Basics
TRAFFIC
- The TRAFFIC, the Wildlife Trade Monitoring Network, is a leading non-governmental organisation working on wildlife trade in the context of both biodiversity conservation and sustainable development.
- It is a joint program of World Wildlife Fund (WWF) and the IUCN.
- It aims to ensure that trade in wild plants and animals is not a threat to the conservation of nature.
- The TRAFFIC is governed by the TRAFFIC Committee, a steering group composed of members of TRAFFIC’s partner organizations, WWF and IUCN.
- TRAFFIC also works in close co-operation with the Secretariat of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
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From UPSC perspective, the following things are important :
Prelims level: Marakkars
Mains level: Various conquests during colonial expansion
The big-budget Malayalam film Marakkar: The Lion of the Arabian Sea is set to be released. It is a war film depicting the heroics of the Marakkar clan, whose leaders were naval chieftains of the Zamorin of Calicut during the 16th and 17th centuries.
Who were the Marakkars?
- By some accounts, they were of Arab origin and had migrated from Tunisia to Panthalayani near Koyilandy in present-day Kozhikode, and later moved to the region around present-day Kottakkal and Thikkodi near Payyoli.
- By other accounts, the Marakkars were descendants of affluent businessman from the Cochin kingdom who migrated later to Calicut.
- Historians say the name ‘Marakkar’ could have originated from maram or marakkalam, meaning ship, as these families lived along the coast and used ships.
- Alternatively, it could have originated from the Arabic word markaba, meaning those who migrated via ships.
- The Marakkars were mostly Muslims, but in some parts, they have been found to be Hindus as well.
What was the war against the Portuguese about?
- The Zamorin, Samoothiri in Malayalam, was the title given to rulers of the Calicut kingdom on the Malabar coast.
- Faced with invading Portuguese ships, the Zamorin reached out to the Marakkars to defend the coast. The Marakkars fought against Portuguese invaders for nearly a century.
- They were led in succession by four Marakkars, chief admirals who were appointed by the Zamorin with the title of Kunjali.
- Related by bloodline, they were Kuttyali Marakkar (Kunjali Marakkar I, appointed in 1507), Kutty Pokker (Kunjali Marakkar II), Pathu Marakkar (Kunjali Marakkar III) and Muhammad Ali Marakkar (Kunjali Marakkar IV, appointed in 1595).
- Their strategy was similar to guerrilla warfare. The Portuguese had massive ships which could not make easy manoeuvres in the sea.
- The Marakkars used small ships which could easily surround the Portuguese ships, enabling the fighters to attack at will.
Who is depicted the ‘Lion of the Arabian Sea’?
- Kunjali Marakkar IV earned his reputation with his fierce onslaught on Portuguese ships, the favours he gave those who fought against the Portuguese, and his efforts to strengthen the fort at Kottakkal.
- When he took charge in 1595, relations between the Zamorin and the Marakkars were deteriorating.
- The Zamorin was feeling threatened by Kunjali Marakkar IV’s popularity, and by reports (said to be spread by the Portuguese) that he was planning to create a Muslim empire.
- In 1597, the Zamorin signed a peace treaty with the Portuguese and attacked Kottakkal fort. For months, the Marakkars resisted the attack by the Zamorin’s Nair soldiers and the Portuguese fleet.
- Eventually, as Portugal sent more forces and the Zamorin mounted his effort, Marakkar surrendered to the Zamorin on the assurance that their lives would be spared. But the Portuguese violated the terms, arrested him, took him to Goa and beheaded him.
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From UPSC perspective, the following things are important :
Prelims level: N95 Masks
Mains level: Coronovirus outbreak
In a new mandate to curb unnecessary demand, the Maharashtra Food and Drug Administration said that chemists cannot sell N95 masks without a doctor’s prescription. The FDA also warned that serious action would be taken against those who are found selling masks at high prices or hoarding them.
Why such a move?
- Personal Protective Equipment (PPE) kits and N95 masks are being sold at very high prices in medical shops. The State has received many complaints about the same.
- It has also been found that many are making bulk purchases and hording PPE kits and N95 masks.
- Since the COVID-19 outbreak in China, shortage of PPE gear and masks has been reported from across the world.
- While the Indian government has currently banned exports of N95 masks, the manufacturers are focussed on making other surgical marks to get good returns from exports.
N95 mask
- A disposable N95 mask (respirator) is a safety device that covers the nose and mouth and helps protect the wearer from breathing in some hazardous substances.
- An N95 respirator is designed to achieve a very close facial fit and very efficient filtration of airborne particles.
- The ‘N95’ designation means that when subjected to careful testing, the respirator blocks at least 95 percent of very small (0.3 micron) test particles.
- If properly fitted, the filtration capabilities of N95 respirators exceed those of face masks. However, even a properly fitted N95 respirator does not completely eliminate the risk of illness or death.
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From UPSC perspective, the following things are important :
Prelims level: Amrit Kaur
Mains level: Not Much
Former PM Indira Gandhi and freedom fighter Rajkumari Amrit Kaur are mentioned in TIME magazine’s list of the 100 most powerful women who defined the last century in a new project that aims to feature those women who were “often overshadowed”.
Who was Amrit Kaur?
- Amrit Kaur was the first woman in independent India who joined the Cabinet as the Health Minister and remained in that position for 10 years.
- Born into the Kapurthala royal family, she was educated in Oxford and returned to India in 1918, and began to be drawn towards the work and teachings of MK Gandhi.
Her contributions
- Before taking up the position of a Health Minister, Kaur was Mahatma Gandhi’s secretary.
- During these 10 years, she founded the Indian Council for Child Welfare.
- She also laid the foundation of the All India Institute of Medical Sciences (AIIMS) and Lady Irwin College in Delhi in the following years.
- Apart from joining the nationalist freedom struggle, Kaur also began work on a number of other social and political issues such as the purdah system, child marriage and the Devadasi system.
- She passed away in 1964, at the age of 75.
Role in the freedom struggle
- In 1936, hoping that more women would join the freedom struggle, Gandhiji invited her.
- In the following years, as Kaur started interacting with other freedom fighters such as Gopal Krishna Gokhale and Mahatma Gandhi, she gave up her princely comforts and began to discipline herself by responding to the Gandhian call.
- When the civil disobedience movement took off in the 1930s, Kaur dedicated her life to it.
- Kaur was jailed after the Quit India movement and carried to the jail a spinning wheel, the Bhagwat Gita and the Bible.
- Further, while Kaur advocated for equality, she was not in favour of reservations for women and believed that universal adult franchise would open the doors for women to enter into the legislative and administrative institutions of the country.
- In light of this, she believed that there was no place left for reservation of seats.
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From UPSC perspective, the following things are important :
Prelims level: Gairsain
Mains level: Two/Three capitals concept
Uttarakhand govt names Gairsain as the new summer capital of the state.
Gairsain
- Gairsain is situated at the eastern edge of the vast Dudhatoli mountain range, located almost at the centre of the state, at a distance of approximately 250 kilometres from Dehradun.
- It is easily accessible from both the Garhwal and the Kumaon divisions, and in a way, acts as the bridge between the two regions.
- Uttarakhand was carved out as a separate state from Uttar Pradesh in 1998.
- Gairsain was best suited to be the capital of the mountainous state as it was a hilly region falling on the border of Kumaon and Garhwal regions.
- But it was Dehradun, located in the plains that served as the temporary capital.
- With the fresh announcement, there is no clarity on either the city’s current status or a new winter capital.
- The state Assembly is located in Dehradun, but sessions are held in Gairsain as well.
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From UPSC perspective, the following things are important :
Prelims level: Perseverance rover
Mains level: Not Much
NASA has named its next Mars rover ‘Perseverence’.
About Perseverance
- The Perseverance rover weighs less than 2,300 pounds and is managed by NASA’s Jet Propulsion Lab.
- The rover’s mission will be to search for signs of past microbial life. It will also collect samples of Martian rocks and dust, according to the release.
- The rover will also be tasked with studying the red planet’s geology and climate.
- All of NASA’s previous Mars rovers — including the Sojourner (1997), Spirit and Opportunity (2004) and Curiosity (exploring Mars since 2012) — were named in this way.
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From UPSC perspective, the following things are important :
Prelims level: Biju Patnaik
Mains level: Not Much
Recently, 104th birth anniversary of former Odisha chief minister Biju Patnaik was celebrated. He was a decorated freedom fighter. PM tweeted an Intelligence Bureau document from 1945 to show how Patnaik bravely lent his flying skills to rescue freedom fighters like Ram Manohar Lohia.
Biju Pattnaik
- Bijayananda Patnaik (1916-1997), popularly known as Biju Patnaik, was an Indian politician, aviator and businessman. As politician, he served twice as the Chief Minister of the State of Odisha.
- It is well known that Biju Patnaik actively helped freedom fighters in the 1940s.
- His daring was evident as he actively joined the Quit India movement in 1942 and collaborated with the underground leaders like Jayaprakash Narayan, Aruna Asif Ali and Dr. Ram Manohar Lohia, even while in the British service.
- Patnaik was imprisoned by the British Government for three years later.
Role in foreign freedom struggles
- As an officer in the Royal Indian Air Force in the early 1940s, Patnaik flew innumerable sorties to rescue British families fleeing the Japanese advance on Rangoon, the capital of Burma.
- He also dropped arms and supplies to Chinese troops fighting the Japanese and later to the Soviet army struggling against Hitler’s onslaught near Stalingrad.
- On the 50th anniversary of the end of the war, Patnaik was honoured by the Russians for his help,” the obit noted.
- Interestingly, Nehru entrusted Patnaik with rescuing Indonesian resistance fighters who were fighting their Dutch colonisers.
- Accompanied by wife Gyanwati, “the lanky pilot flew an old Dakota aircraft to Singapore en route to Jakarta where the rebels were entrenched” in 1948.
- Dodging the Dutch guns, he entered Indonesian airspace and landed on an improvised airstrip near Jakarta.
- Using left-over fuel from abandoned Japanese military dumps, Patnaik took off with prominent rebels, including Sultan Shariyar and Achmad Sukarno, for a secret meeting with Nehru at New Delhi.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Media Access Control (MAC) Binding
Mains level: Internet shutdown as an infringement of FR
After seven months, the use of social media was allowed in Jammu and Kashmir with an order laying down the latest rules for the use of the Internet in the UT. Among various conditions, the order says Internet connectivity will be made available “with mac-binding”.
What is Mac-binding?
- Every device has a Media Access Control (MAC) address, a hardware identification number that is unique to it. While accessing the Internet, every device is assigned an IP address.
- Mac-binding essentially means binding together the MAC and IP addresses, so that all requests from that IP address are served only by the computer having that particular MAC address.
- In effect, it means that if the IP address or the MAC address changes, the device can no longer access the Internet.
- Also, monitoring authorities can trace the specific system from which a particular online activity was carried out.
Permitted connections
- The Internet can be accessed on all postpaid devices, and those using Local Area Networks (LAN).
- While the postpaid SIM card holders shall continue to be provided access to the Internet, these services shall not be made available on prepaid SIM cards unless verified as per the norms applicable for postpaid connections.
- Apart from this, special access terminals provided by the government will continue to run.
- It is further directed that the access/communication facilities provided by the government, viz. e-terminals/Internet kiosks apart from special arrangements for tourists, students, traders etc shall continue.
Only 2G permitted
- Internet speed in J&K is still restricted to 2G.
- This means very slow services — pictures will take a long time to be sent or downloaded, videos will be nearly impossible to share, and there will be a long loading time for most websites.
- It also means that although in theory, the “whitelist system” — where people could only access some websites pre-approved by the government — has been removed, some sites designed for a 4G Internet experience will hardly work.
Have curbs been lifted?
- Not exactly. The latest order is to remain in force till March 17 unless modified earlier.
- The government has been relaxing Internet and phone usage in the UTs in phases.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Unguarded X hypothesis, Chromosomes
Mains level: NA
Men outnumbered women by 37 million in the 2011 Census of India, but among those over the age of 60, there were more than 1 million more women than men. In general, men live shorter lives than women worldwide. This is due to the chromosomal differences between the two, points’ new study.
What are Chromosomes?
- The human body is made up of cells, and in the centre of each cell is the nucleus. Chromosomes, which are located inside the nucleus, are structures that hold the genes.
- It is the genes that determine the various traits of an individual including eye colour, blood type — and sex.
- The human cell has 23 pairs of chromosomes. One pair is of the sex chromosomes, named X and Y, which determine whether an individual is male or female.
- A female has two X chromosomes (XX) while a male has one X and one Y (XY).
Unguarded X hypothesis
- This hypothesis suggests that the Y chromosome in XY is less able to to protect an individual from harmful genes expressed on the X chromosome.
- In a male, as the Y chromosome is smaller than the X chromosome, it is unable to “hide” an X chromosome that carries harmful mutations, which may later expose the individual to health threats.
- On the other hand, the hypothesis goes, there is no such problem in a pair of X chromosomes (XX) in a female.
- If one of the X chromosomes has genes that have suffered mutations, then the other X chromosome, which is healthy, can stand in for the first, so that the harmful genes are not expressed.
- This maximizes the length of life, according to the hypothesis. And this is what the UNSW researchers set out to examine.
Testing the hypothesis
- In a statement issued by UNSW, PhD student and study first author Zoe Xirocostas said the
- Unguarded X hypothesis appears to stack up, after examining the lifespan data available on a wide range of animal species.
- Researchers studied lifespan data in not just primates but mammals and birds, but also reptiles, fish, amphibians, arachnids, cockroaches, grasshoppers, beetles, butterflies and moths among others.
- It was found that across that broad range of species, the heterogametic sex (XY in humans) does tend to die earlier than the homogametic sex (XX in humans).
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From UPSC perspective, the following things are important :
Prelims level: Various species mentioned
Mains level: Not Much
With new additions to the wildlife list put out by the Convention on the Conservation of Migratory Species (CMS), scientists say that the total number of migratory fauna from India comes to 457 species.
Migratory species in India
- Globally, more than 650 species are listed under the CMS appendices and India, with over 450 species, plays a very important role in their conservation.
- The Zoological Survey of India (ZSI) had for the first time compiled the list of migratory species of India under the CMS before the Conference of Parties (COP 13) held in Gujarat recently.
- It had put the number at 451. They are the Asian elephant, great Indian bustard, Bengal florican, oceanic white-tip shark, urial and smooth hammerhead shark.
- Birds comprise 83% (380 species) of this figure.
Various species mentioned
- India has three flyways (flight paths used by birds): the Central Asian flyway, East Asian flyway and East Asian–Australasian flyway.
- In India, their migratory species number 41, followed by ducks (38) belonging to the family Anatidae.
- The estimate of 44 migratory mammal species in India has risen to 46 after COP 13.
- The largest group of mammals is definitely bats belonging to the family Vespertilionidae. Dolphins are the second highest group of mammals with nine migratory species of dolphins listed.
- Fishes make up another important group of migratory species. Before COP 13, the ZSI had compiled 22 species, including 12 sharks and 10 ray fish.
- Seven reptiles, which include five species of turtles and the Indian gharial and salt water crocodile, are among the CMS species found in India. There was no addition to the reptiles list.
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From UPSC perspective, the following things are important :
Prelims level: Spectroscopy, Raman Effect
Mains level: Applications of Raman Effect
Yesterday, February 28th was celebrated as National Science Day. In 1986, the Govt. of India designated this Day, to commemorate the announcement of the discovery of the “Raman effect”.
CV Raman
- Raman conducted his Nobel-prize winning research at IACS, Calcutta.
- While he was educated entirely in India, Raman travelled to London for the first time in 1921, where his reputation in the study of optics and acoustics was known to physicists such as JJ Thomson and Lord Rutherford.
- The Raman Effect won scientist Sir CV Raman the Nobel Prize for physics in 1930.
- It was also designated as an International Historic Chemical Landmark jointly by the American Chemical Society (ACS) and the Indian Association for the Cultivation of Science (IACS).
- His speciality was the study of vibrations and sounds of stringed instruments such as the Indian veena and tambura, and Indian percussion instruments such as the tabla and mridangam.
The Raman Effect
- In 1928, Raman discovered that when a stream of light passes through a liquid, a fraction of the light scattered by the liquid is of a different colour.
- While Raman was returning from London in a 15-day voyage, he started thinking about the colour of the deep blue Mediterranean.
- He wasn’t convinced by the explanation that the colour of the sea was blue due to the reflection of the sky.
- As the ship docked in Bombay, he sent a letter to the editor of the journal Nature, in which he penned down his thoughts on this.
- Subsequently, Raman was able to show that the blue colour of the water was due to the scattering of the sunlight by water molecules.
- By this time he was obsessed with the phenomenon of light scattering.
Observing the effect
- The Raman Effect is when the change in the energy of the light is affected by the vibrations of the molecule or material under observation, leading to a change in its wavelength.
- Significantly, it notes that the Raman effect is “very weak” — this is because when the object in question is small (smaller than a few nanometres), the light will pass through it undisturbed.
- But a few times in a billion, light waves may interact with the particle. This could also explain why it was not discovered before.
- In general, when light interacts with an object, it can either be reflected, refracted or transmitted.
- One of the things that scientists look at when light is scattered is if the particle it interacts with is able to change its energy.
Applications
- Raman spectroscopy is used in many varied fields – in fact, any application where non-destructive, microscopic, chemical analysis and imaging is required.
- Whether the goal is qualitative or quantitative data, Raman analysis can provide key information easily and quickly.
- It can be used to rapidly characterize the chemical composition and structure of a sample, whether solid, liquid, gas, gel, slurry or powder.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Red snow , How it occurs
Mains level: Impact of climate change on Antarctica
Over the last few weeks, photographs of “red snow” off the coast of Antarctica’s northernmost peninsula, have gone viral. “Red snow” or “watermelon” is a phenomenon that has been known since ancient times. Now, it raises concerns about climate change.
Red snow in Antarctica: Why it happens
- Aristotle is believed to be one of the first to give a written account of red snow, over 2,000 years ago.
- What Aristotle described as worms and grub, the scientific world today calls algae.
- This alga species, Chlamydomonas Chlamydomonas nivalis, exists in the snow in the polar and glacial regions and carries a red pigment to keep itself warm.
Signs of faster melting
- In turn, the red snow causes the surrounding ice to melt faster. The more the algae packed together, the redder the snow.
- And the darker the tinge, the more the heat absorbed by the snow. Subsequently, the ice melts faster.
- While the melt is good for the microbes that need the liquid water to survive and thrive, it’s bad for glaciers that are already melting from a myriad of other causes, the study said.
- These algae change the snow’s albedo — which refers to the amount of light or radiation the snow surface is able to reflect back. Changes in albedo lead to more melting.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Doomsday Vault
Mains level: Not Much
The Svalbard Global Seed Vault — referred to as the earth’s ‘doomsday vault’ — now contains about 1.05 million seeds.
Global Seed Vault
- The vault — in the island of Spitsbergen, midway between Norway and the North Pole — opened in 2008 and preserves seeds for several food varieties.
- The aim of the vault is to preserve a vast variety of crop seeds in the case of a doomsday event, calamity, climate change or national emergency.
- The vault is artificially cooled at temperatures of minus 18 degrees Celsius.
- The low temperature and limited access to oxygen will ensure low metabolic activity and delay seed ageing.
- The permafrost surrounding the facility will help maintain the low temperature of the seeds if the electricity supply fails.
Access to seeds
- Vault seed samples are copies of samples stored in the depositing genebanks.
- Researchers, plant breeders, and other groups wishing to access seed samples cannot do so through the seed vault; they must instead request samples from the depositing genebanks.
- The samples stored in the genebanks will, in most cases, be accessible in accordance with the terms and conditions of the International Treaty on Plant Genetic Resources for Food and Agriculture, approved by 118 countries or parties.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Henneguya Salminicola
Mains level: NA
Researchers at Tel Aviv University have discovered a non-oxygen breathing animal, which significantly changes one of science’s assumptions about the animal world — that all animals use aerobic respiration and therefore, oxygen.
Henneguya Salminicola
- The organism is Henneguya salminicola, a fewer-than-10-celled microscopic parasite that lives in salmon muscle.
- It relies on anaerobic respiration (through which cells extract energy without using oxygen).
- In the case of this non-oxygen breathing organism, evolution turned it into a simpler organism that shed “unnecessary genes” responsible for aerobic respiration.
- Other organisms such as fungi and amoebas that are found in anaerobic environments lost the ability to breathe over time.
- The new study shows that the same can happen in the case of animals, too.
What is Aerobic respiration?
- Animals, including humans, need energy to perform the various tasks that are essential for survival.
- Aerobic respiration is one such chemical reaction through which organisms take in oxygen and release carbon dioxide into the atmosphere.
- Through this mechanism, energy is transferred to cells, which can use it for multiple purposes — for instance, to burn food.
- Mitochondria is the “powerhouse” of the cell, which captures oxygen to make energy — its absence in the H. salminicola genome indicates that the parasite does not breathe oxygen.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Solar Storms
Mains level: Solar storms and their impact on Earth
According to a research, sudden releases of high-energy particles from the sun, called solar storms, can mess with the navigational ability of gray whales, causing them to strand on land.
Solar storms
- Solar storms are a variety of eruptions of mass and energy from the solar surface.
- Flares, prominences, sunspots, coronal mass ejections are the common harbingers of solar activity, as are plages and other related phenomena seen at other wavelengths.
Impact on Whales
- Solar storms have the potential to modify geomagnetic field and disrupt magnetic orientation behaviour of animals, hampering their navigation during long periods of migration.
- They disrupt earth’s magnetic field — and the whales’ navigational sense.
- The radio frequency noise created by the solar outburst affects the whales’ senses in a way that prevents them from navigating at all.
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