Other meanings of Theodor Svedberg
Chemistry
Theodor Svedberg (1884–1971) was a Swedish physical chemist whose invention of the ultracentrifuge transformed the study of macromolecules and earned him the 1926 Nobel Prize in Chemistry. His work established that proteins are well-defined, high-molecular-weight entities, laying the groundwork for modern molecular biology and biochemistry.1
Svedberg was born in Fleräng, Gävleborg County, Sweden, to Elias Svedberg, a civil engineer, and Augusta Alstermark. He showed an early aptitude for science and enrolled at Uppsala University in 1904, where he studied chemistry and physics under the influential physical chemist Wilhelm Palmær. His doctoral thesis, completed in 1908, dealt with colloidal solutions and Brownian motion, topics that would define his career.
At Uppsala, Svedberg became part of a vibrant scientific community that encouraged interdisciplinary work. He was appointed docent in chemistry in 1908 and later professor of physical chemistry in 1912, a position he held for nearly four decades. His early research on colloids—substances like gels and emulsions—led him to question the prevailing view that proteins were ill-defined aggregates, setting the stage for his later breakthroughs.2
Svedberg's most famous achievement was the development of the ultracentrifuge, a device that spins samples at extremely high speeds to separate molecules by their sedimentation rates. Working with his collaborator Herman Rinde, he built the first analytical ultracentrifuge in 1923, which could generate centrifugal forces over 100,000 times gravity. This allowed him to measure the molecular weights of proteins with unprecedented precision, demonstrating that proteins like hemoglobin are uniform in size and mass.
The ultracentrifuge revolutionized biochemistry by providing a direct method to characterize macromolecules in solution. It enabled Svedberg to show that proteins are not random aggregates but have defined molecular weights, a finding that contradicted earlier theories. His work also extended to other biopolymers, including nucleic acids and polysaccharides, and he introduced the concept of the sedimentation coefficient, now expressed in Svedberg units (S). The instrument became a standard tool in laboratories worldwide, influencing fields from virology to polymer science.
Svedberg received the 1926 Nobel Prize in Chemistry "for his work on disperse systems," a recognition that highlighted his contributions to colloid chemistry and the ultracentrifuge. The prize was awarded during a period of intense scientific activity, and Svedberg used the recognition to further promote physical chemistry in Sweden. He continued to refine the ultracentrifuge, developing models that could operate at even higher speeds and with better optical detection systems.
In the 1930s and 1940s, Svedberg expanded his research into radiation chemistry and nuclear physics, collaborating with colleagues on the effects of radiation on biological systems. He also played a key role in establishing the Gustaf Werner Institute for Nuclear Chemistry at Uppsala, which became a center for isotope research. Svedberg retired from his professorship in 1949 but remained active in science, serving as an advisor to Swedish industry and government until his death in 1971.
Beyond the ultracentrifuge, Svedberg had a deep interest in photography and art, and he used his scientific skills to improve photographic emulsions. He also studied the sedimentation of viruses, including tobacco mosaic virus, which helped establish virology as a quantitative science. Less well known is his work on the fractionation of isotopes using centrifugation, a precursor to modern isotope separation techniques used in nuclear energy.
Svedberg was a prolific writer and editor, contributing to major reference works on colloid chemistry. He also mentored a generation of Scandinavian scientists, including Arne Tiselius, who later won a Nobel Prize for electrophoresis. Svedberg's personal life included a passion for mountaineering and sailing, and he often combined these hobbies with scientific expeditions, collecting samples from remote locations. His legacy is preserved in the Svedberg Laboratory in Uppsala, which continues to conduct research in nuclear physics and biology.
Svedberg's name is also commemorated in the Svedberg unit (S), a standard measure in ultracentrifugation, and in the asteroid 3670 Svedberg, discovered in 1985.
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