Unit 5: Lives of Some Chemists from Modern India and Their Contributions

Professor Har Govind Khorana (1922-2011)

Contribution: Awarded the Nobel Prize in Physiology or Medicine in 1968 for his work on the "interpretation of the genetic code and its function in protein synthesis."

Genetic Code: After the genetic code (which uses 3-letter "words" or codons) was discovered, Khorana's work demonstrated how these codons are read by the cell to build proteins.
First Artificial Gene: His team achieved the world's first total synthesis of a gene (a yeast gene) in 1972, a landmark achievement in genetic engineering.
He essentially proved how the DNA's instructions are translated into the proteins that make up a living organism.

Professor C N R Rao (b. 1934)

Contribution: A world-renowned authority on Solid-State Chemistry and Materials Science. Awarded the Bharat Ratna (India's highest civilian honor) in 2014.

Materials Science: He has made immense contributions to understanding metal oxides, high-temperature superconductors, and nanomaterials.
Nanomaterials: He was a pioneer in the field of 2D materials (like graphene) and the synthesis of carbon nanotubes.
He has published over 1,800 research papers and 50 books.

Dr. Shanti Swarup Bhatnagar (1894-1955)

Contribution: Revered as the "Father of Research Laboratories" in India.

Scientific Work: He was an accomplished chemist, known for his work in colloid chemistry and chemical emulsions.
Institution Builder: His greatest contribution was as an administrator. He was the first Director-General of the Council of Scientific and Industrial Research (CSIR).
He established a network of 12 national laboratories (e.g., National Chemical Laboratory, National Physical Laboratory) across India, which form the backbone of Indian scientific research today.

Dr. Asima Chatterjee (1917-2006)

Contribution: A pioneering female scientist known for her work in phytomedicine (plant-based medicine) and natural product chemistry.

First Woman PhD in Science: She was the first woman to be awarded a Doctorate of Science from an Indian university (1944).
Alkaloid Research: She specialized in isolating and determining the structure of active compounds from Indian medicinal plants.
Key Discoveries: She developed an anti-epileptic drug (Ayush-56) from the Marsilea plant and made significant contributions to the chemistry of vinca alkaloids (from the periwinkle plant), which are used in chemotherapy.

Nobel laureate Venkatraman Ramakrishnan (b. 1952)

Contribution: Awarded the Nobel Prize in Chemistry in 2009 for "studies of the structure and function of the ribosome."

The Ribosome: The ribosome is the cell's "protein factory." It reads the genetic code (from mRNA) and assembles amino acids into long protein chains.
Structural Work: Using X-ray crystallography, Ramakrishnan and his team created a detailed, atom-level 3D map of the ribosome's smaller subunit (the 30S subunit).
This work explained *how* the ribosome works so precisely, including how antibiotics bind to bacterial ribosomes and stop them (a key to designing new drugs).

Dr. Kamala Sohonie (1911-1998)

Contribution: A pioneering biochemist and the first Indian woman to receive a PhD in a scientific discipline (from Cambridge University in 1939).

Breaking Barriers: She famously overcame the gender bias of Prof. C.V. Raman to become the first female student at the Indian Institute of Science (IISc), Bangalore.
Nutritional Research: Her research focused on the nutritional value of Indian foods. Her most significant work was on 'Neera' (fresh palm nectar), which she proved was a rich source of Vitamin C and other nutrients, and could combat malnutrition in tribal communities.

Dr. Yellapragada Subba Rao (1895-1948)

Contribution: A brilliant biochemist called the "Wizard from India," responsible for discovering several of the 20th century's most important medicines.

Discovery of ATP: As a student at Harvard, he co-discovered Adenosine Triphosphate (ATP), the "energy currency" molecule of all life, and phosphocreatine.
"Miracle Drugs": While working at Lederle Laboratories, his team discovered:
- Aureomycin (Tetracycline): The first of the tetracycline antibiotics, which saved millions of lives.
- Methotrexate: One of the very first chemotherapy drugs, still used today to treat cancer and autoimmune diseases.

Dr. Darshan Ranganathan (1941-2001)

Contribution: An outstanding organic chemist known for her original work in bio-organic chemistry and designing self-assembling molecules.

Protein Folding: She made significant contributions to understanding how proteins fold into their correct 3D shapes.
Supramolecular Chemistry: She was a pioneer in "supramolecular assembly," designing and synthesizing artificial molecular scaffolds that could mimic natural biological processes, such as holding other molecules in specific, functional arrangements.
She was a Fellow of the Indian Academy of Sciences and a prolific researcher despite facing institutional barriers for much of her career.