Monumental discoveries
in the history of science.

Sir Chandrasekhara Venkata Raman (C. V. Raman) was one of India's greatest physicists and the first Indian scientist to receive the Nobel Prize in Physics. Born on 7 November 1888 in Tiruchirappalli, Tamil Nadu, Raman developed a strong interest in physics from an early age. Although he initially worked in the Indian Finance Department, his passion for science led him to conduct research during his spare time at the Indian Association for the Cultivation of Science (IACS), Kolkata. The laboratory at IACS became the setting for some of his most important early research and played a central role in the discovery that would make his name famous throughout the world.

Raman's most important scientific achievement was the discovery of the Raman Effect in 1928. While investigating the scattering of light in liquids and transparent materials at IACS, Raman and his collaborator K. S. Krishnan observed that when monochromatic light passes through a substance, most of the scattered light retains the same wavelength, but a very small fraction emerges with wavelengths different from the incident light. This phenomenon occurs because photons interact with molecules and exchange energy with their vibrational and rotational motions. The resulting wavelength shifts contain information about the internal structure of molecules.

The discovery became the foundation of Raman spectroscopy, a technique that allows scientists to study the molecular composition and structure of matter through the characteristic scattering of light. Raman spectroscopy became particularly important for studying molecular vibrations and rotations. It provided information that was difficult to obtain using conventional optical and infrared techniques. For certain homonuclear molecules, such as hydrogen and nitrogen, which possess no permanent electric dipole moment and therefore have weak or forbidden ordinary infrared rotational-vibrational spectra, Raman spectroscopy provided an important alternative method for investigating their molecular structure. Analysis of Raman rotational spectra could be used to determine molecular rotational constants and, consequently, internuclear bond lengths—information that had previously been extremely difficult to obtain by conventional spectroscopic methods.

Thus, Raman's discovery was much more than the observation of a new optical phenomenon. It opened a new window into the microscopic structure of molecules. The characteristic Raman spectrum of a substance can serve as a molecular fingerprint, allowing scientists to identify compounds and investigate their bonding, symmetry, molecular vibrations, and structure.

For his work on the scattering of light and the discovery of the Raman Effect, Raman received the Nobel Prize in Physics in 1930. He later established the Raman Research Institute in Bangalore, where he continued his investigations into optics, acoustics, crystals, and the properties of materials.

The Indian Association for the Cultivation of Science in Kolkata therefore holds a special place in the history of Indian science. It was in the IACS laboratory that Raman transformed a question about the scattering of light into a discovery that revolutionized molecular spectroscopy. His work demonstrated that fundamental research conducted in India could produce discoveries of global significance.

Kishori Mohan Bandyopadhyay was an Indian laboratory and field worker whose contributions were associated with some of the earliest investigations into malaria transmission in Bengal. He is particularly remembered for his work with British physician and researcher Ronald Ross during Ross's malaria investigations in India.

During the late nineteenth century, malaria was one of the most serious diseases affecting people in India. Although scientists knew that the disease was caused by a parasite, the mechanism by which malaria was transmitted was still being investigated. Ross was studying mosquitoes to determine whether they played a role in the transmission of the disease.

Bandyopadhyay worked as a laboratory assistant and field collaborator with Ross. Historical accounts describe his involvement in collecting mosquitoes, assisting with field investigations, and helping obtain biological material from people affected by malaria. His work was particularly valuable because malaria research required extensive field collection and laboratory examination.

Ross's subsequent research demonstrated the role of Anopheles mosquitoes in the transmission of malaria parasites. His discoveries became a major milestone in tropical medicine, and he received the Nobel Prize in Physiology or Medicine in 1902 for his work on malaria.

It is important to describe Bandyopadhyay's role accurately. He is sometimes popularly described as a co-discoverer of mosquito-borne malaria, but historical accounts more specifically identify him as a laboratory and field collaborator who assisted Ross's investigations. His contribution illustrates the importance of assistants and field workers in major scientific discoveries.

Bandyopadhyay later became involved in public-health and anti-malaria activities in Bengal. He worked on community-based malaria prevention and environmental sanitation, including measures aimed at reducing mosquito breeding.

His story is significant because it highlights an often-overlooked aspect of scientific history: major discoveries frequently depend on the practical work of laboratory assistants, field researchers, technicians, and local communities.

Gopalasamudram Narayanan Ramachandran, popularly known as G. N. Ramachandran, was one of India's most important scientists in structural biology and biophysics. Born on 8 October 1922 in Ernakulam, Kerala, he initially trained as a physicist and later applied physics and mathematics to the study of biological molecules.

Ramachandran conducted his doctoral research under C. V. Raman, establishing an important scientific connection between two generations of Indian scientists. His research later focused on the structure of proteins and biological macromolecules.

One of his major achievements was the development of a structural model for collagen, an important protein found in connective tissues. In 1954, Ramachandran and Gopinath Kartha proposed a triple-helical structure for collagen based on X-ray diffraction studies and structural calculations. Their work became an important milestone in structural biology.

Ramachandran's most famous contribution is the Ramachandran plot, developed to understand the possible three-dimensional conformations of protein backbones. Protein chains contain peptide bonds, and the backbone can rotate around specific bonds. These rotations are described by the φ (phi) and ψ (psi) dihedral angles. However, because atoms cannot occupy the same physical space, only certain combinations of these angles are sterically possible.

Ramachandran and his colleagues calculated these allowed conformations and represented them graphically. The resulting diagram became known as the Ramachandran plot. Regions of the plot correspond to conformations associated with important protein structures such as α-helices and β-sheets.

Today, the Ramachandran plot is widely used in structural biology, protein crystallography, cryo-electron microscopy, molecular modelling, and bioinformatics. Scientists use it to examine whether the geometry of a protein structure is physically reasonable.

Ramachandran also contributed to X-ray tomography and founded the Molecular Biophysics Unit at the Indian Institute of Science. His work demonstrated how physics, mathematics, and biology could be combined to understand the structure of life at the molecular level.