Myristica Swamps
Why in News: A team of researchers recently identified a Myristica swamp forest in Kumbral, Maharashtra, that is being safeguarded by the local community.
About Myristica Swamps:
Nature and Characteristics
- Myristica swamps are freshwater ecosystems dominated by evergreen trees from the Myristicaceae family.
- Referred to as “living fossils” due to the ancient origin of Myristica plants.
- These swamps date back around 140 million years, making them valuable for evolutionary research.
- They are marked by trees with large, protruding roots growing out of waterlogged soil, which remains submerged year-round.
Geographical Distribution
- Found mainly in the Western Ghats of India, with smaller patches in the Andaman and Nicobar Islands and Meghalaya.
- Historically, they formed an extensive hydrological network across the Western Ghats.
Climatic Conditions
- Their formation depends on abiotic factors like valley shape, annual rainfall (about 3000 mm), and year-round water availability.
- Typically located near rivers, these swamps help retain water and act as natural sponges, ensuring perennial water supply.
Ecological Importance
- Myristica swamps have a greater capacity to sequester carbon compared to non-swampy forests.
- They support a rich variety of vertebrate and invertebrate species due to stable macroecological conditions like high humidity and moderate temperatures.
- Example: The Myristica Swamp Treefrog (Mercurana myristicapalustris), found only in select areas of the Shendurney and Peppara Wildlife Sanctuaries in Kerala.
Photoelectric Effect
Why in News: Researchers are revitalizing interest in the photoelectric effect, which is opening up possibilities for improved imaging of proteins and viruses, advancing our understanding of biochemical reactions, and aiding in the selection of new materials for next-generation electronics.
About Photoelectric Effect:
Definition
- The photoelectric effect is a process where electrons are emitted from a material’s surface when exposed to light of a certain frequency.
How it Works
- When light photons strike a material (usually metal), they transfer energy to the electrons. If the energy exceeds a specific threshold, the electrons are emitted.
- The energy must surpass the material’s work function (the electron’s binding energy) for the electron to be released from the surface.
Kinetic Energy Transfer
- Any excess energy from the photon, after overcoming the work function, is converted into the kinetic energy of the emitted electron.
Photoemissive Materials
- A material that exhibits this effect is termed photoemissive, and the emitted electrons are called photoelectrons.
Discovery
- The phenomenon was discovered by German physicist Heinrich Rudolf Hertz in 1887.
Quantum Insights
- The photoelectric effect is crucial for understanding light’s quantum nature, demonstrating that light behaves both as a wave and a particle.
- This wave-particle duality is a fundamental aspect of quantum mechanics, highlighting light’s dual characteristics.
Scientific and Technological Impact
- The understanding of the photoelectric effect has far-reaching implications, particularly in developing photovoltaic cells and improving advanced imaging technologies.
Paraguay River
Why in News: A severe drought in the Amazon rainforest resulted in the Paraguay River reaching its lowest water levels in over a hundred years.
About Paraguay River:
Size and Course
- The Paraguay River is the fifth largest river in South America, spanning about 1,584 miles (2,549 kilometers).
- It originates in the Brazilian state of Mato Grosso (in the Brazilian Highlands) and flows to its confluence with the Paraná River near Corrientes, Argentina.
Countries Covered
- It passes through Brazil, Bolivia, Paraguay, and Argentina, serving as a natural boundary between Paraguay and Brazil, and Paraguay and Argentina.
Ecological Importance
- The Upper Paraguay River Basin houses the Pantanal, the largest tropical wetland and one of the most ecologically rich environments in the world.
Global Significance
- Together with the Paraná and Uruguay Rivers, the Paraguay River forms the second most significant drainage system globally, covering about 1.6 million square miles.
- These rivers discharge 2.8 million cubic feet of water per second into the Rio de la Plata estuary, making their outflow second only to the Amazon, eventually emptying into the Atlantic Ocean.
Presbyopia
Why in News: Mumbai-based Entod Pharmaceuticals recently announced that the Drug Controller General of India (DCGI) has approved its new eye drop, PresVu, designed to lessen reliance on reading glasses for individuals suffering from presbyopia.
About Presbyopia:
- Presbyopia is a condition that develops with age, where the eyes gradually lose the ability to focus on close objects.
- Typically, it starts around the age of 40, and doctors commonly recommend spectacles as an effective solution to manage this condition.
How does PresVu work?
- Active Ingredient: The active ingredient in PresVu is Pilocarpine, a compound that helps the eyes focus better by contracting the iris muscles, which control pupil size and improve clarity for nearby objects.
- Technology: PresVu employs “advanced dynamic buffer technology” that adjusts to the pH level of tears, ensuring consistent effectiveness and safety for long-term use.
- Usage: It is a prescription-only eye drop with effects lasting four to six hours, and it is not recommended for individuals with iris inflammation.
Side Effects:
- Regular use may cause itching, redness, eyebrow pain, and muscle spasms in the eyes.