Melvin Calvin

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Lore & Background

Melvin Calvin was born in St. Paul, Minnesota, the son of Elias Calvin and Rose Herwitz, Jewish immigrants from the Russian Empire. His family moved to Detroit, Michigan, where his parents ran a grocery store. He graduated from Central High School in 1928, then studied at Michigan College of Mining and Technology, where he received the school's first Bachelors of Science in Chemistry. He earned his PhD at the University of Minnesota in 1935 under George Glockler, writing his thesis on the electron affinity of halogens. He then joined Michael Polanyi's lab at the University of Manchester as a postdoctoral student, studying the structure and behavior of organic molecules. In 1942, he married Marie Genevieve Jemtegaard; they had two daughters, Elin and Karole, and a son, Noel. Joel Hildebrand invited Calvin to join the faculty at UC Berkeley, making him the first non-Berkeley graduate hired by the chemistry department in over 25 years. Calvin's research built on Martin Kamen and Sam Ruben's discovery of long-lived radioactive carbon-14 in 1940. In 1947, he was promoted to Professor of Chemistry and director of the Bio-Organic Chemistry group in the Lawrence Radiation Laboratory. His team included Andrew Benson and James A. Bassham, who together mapped the complete route carbon travels through a plant during photosynthesis, from absorption as atmospheric carbon dioxide to conversion into carbohydrates. The process is called the Calvin–Benson–Bassham Cycle. In 1963, Calvin was given the additional title of Professor of Molecular Biology. He was founder and Director of the Laboratory of Chemical Biodynamics, known as the "Roundhouse", and simultaneously Associate Director of Berkeley Radiation Laboratory, where he conducted much of his research until his retirement in 1980. In his final years of active research, he studied the use of oil-producing plants as renewable sources of energy and wrote a book on the chemical evolution of life published in 1969. Calvin designed the circular "Roundhouse" laboratory to facilitate collaboration between students and visiting scientists. He brought in postdoctoral students and guest scientists from around the world. He served as president of the American Chemical Society, the American Society of Plant Physiology, and the Pacific Division of the American Association for the Advancement of Science. He also chaired the Committee on Science and Public Policy for the National Academy of Sciences. He collaborated with NASA to create plans to protect the Moon from biological contamination from Earth and Earth from contamination from the Moon during the Apollo missions, and helped develop strategies for bringing back lunar samples and searching for biological life on other planets. He served on the President's Science Advisory Committee from 1963 to 1966 and on the Energy Research Advisory Board of the Department of Energy.

Reader's Guide

Melvin Calvin's significance lies in his leadership of the research that elucidated the Calvin cycle, the pathway by which plants convert atmospheric carbon dioxide into organic compounds during photosynthesis. Using carbon-14 as a tracer, his team—including Andrew Benson and James Bassham—mapped the complete route. Benson began by continuing previous work on dark CO2 fixation, crystallizing radioactive succinic acid, and showing that radioactive sucrose formed at the same rate when algae were exposed to light without CO2 then transferred to a dark flask with CO2, proving a non-photochemical reduction of CO2. Using paper chromatographic techniques pioneered by W.A. Stepka, they determined the first product of CO2 fixation was 3-carbon phosphoglyceric acid (PGA). After this discovery, a competing lab at the University of Chicago could not confirm it, leading to a symposium sponsored by the American Association for the Advancement of Science. Calvin and Benson convinced the audience their position was correct. Further work identified the remaining members of the glycolytic sequence. Benson noticed two unknown sugars on chromatograms and, with James A. Bassham's collaboration using periodate degradation, identified them as ketoses. Bassham's identification of 14% activity in the carbonyl carbon of one sugar led him to seven-carbon sugars. By restricting CO2 uptake, they increased the level of ribulose bisphosphate, indicating it was the CO2 acceptor. Calvin later determined the novel carboxylation mechanism, completing the cycle in 1958. This work earned him the 1961 Nobel Prize in Chemistry. Beyond the cycle, Calvin's organizational skills, exemplified by the Roundhouse laboratory, promoted interdisciplinary collaboration. His later research on renewable energy from oil-producing plants and chemical evolution of life extended his impact.

Did You Know?

• Calvin received the first Bachelors of Science in Chemistry ever awarded by Michigan College of Mining and Technology (now Michigan Technological University).
• He was the first non-Berkeley graduate hired by the UC Berkeley chemistry department in over 25 years.
• Calvin's team used paper chromatographic techniques pioneered by W.A. Stepka to identify the first product of CO2 fixation as 3-carbon phosphoglyceric acid.
• He served on the President's Science Advisory Committee from 1963 to 1966.
• In his final years of active research, Calvin studied the use of oil-producing plants as renewable sources of energy.

From a Grocery Store to the Laboratory Bench

Melvin Ellis Calvin was born on April 8, 1911, in St. Paul, Minnesota, to Elias Calvin and Rose Herwitz, Jewish immigrants from the Russian Empire—land that today comprises Lithuania and Georgia. The family later settled in Detroit, Michigan, where his parents ran a grocery store. Young Calvin was a frequent sight among the shelves, examining every product with a curiosity that foreshadowed a lifetime of scientific inquiry. He graduated from Central High School in 1928 and then enrolled at the Michigan College of Mining and Technology, now Michigan Technological University, where he received the school's first-ever Bachelor of Science in Chemistry. His doctoral work at the University of Minnesota, completed in 1935 under George Glocker, focused on the electron affinity of halogens. A two-year postdoctoral period at the University of Manchester, in Michael Polanyi's laboratory, deepened his understanding of organic molecular structure and behavior. In 1942 he married Marie Genevieve Jemtegaard; together they raised three children—daughters Elin and Karole, and son Noel.

Tracing Carbon's Journey Through the Leaf

The work that earned Calvin the 1961 Nobel Prize in Chemistry grew from difficult circumstances. Sam Ruben and Martin Kamen had pioneered research with the long-lived radioactive isotope carbon-14, but the project was derailed when Ruben died in a laboratory accident and Kamen faced security troubles with the FBI and the Department of State. Ernest Lawrence, director of the Radiation Laboratory, and Wendell Latimer, Dean of Chemistry and Chemical Engineering, nonetheless recruited Calvin in 1945 to carry the work forward. Calvin assembled a team of strong chemists and brought in Andrew Benson, who had previously collaborated with Ruben and Kamen on photosynthesis, to lead that line of inquiry. The prevailing assumption held that sugar production was purely a light-driven reaction. Benson challenged this by isolating the product of dark carbon dioxide fixation, crystallizing radioactive succinic acid, and showing that when algae exposed to light without carbon dioxide were quickly transferred to a dark flask containing it, radioactive sucrose still formed at the same rate as under continuous illumination. Using carbon-14 as a tracer, Calvin, Benson, and James Bassham mapped the complete pathway by which atmospheric carbon dioxide becomes carbohydrates and other organic compounds. It became known as the Calvin–Benson–Bassham Cycle.

The Roundhouse and a Philosophy of Collaboration

Calvin's influence at UC Berkeley extended far beyond a single discovery. In 1947 he was elevated to Professor of Chemistry and director of the Bio-Organic Chemistry group within the Lawrence Radiation Laboratory, and in 1963 he added the title Professor of Molecular Biology. He went on to found and direct the Laboratory of Chemical Biodynamics, affectionately called the Roundhouse, while simultaneously serving as Associate Director of the Berkeley Radiation Laboratory. The Roundhouse's circular architecture was no accident; Calvin designed it to break down the barriers between disciplines and to make open scientific discussion a natural part of daily life. He regularly brought in postdoctoral researchers and guest scientists from around the world, convinced that the richest ideas emerged where different fields of knowledge intersected. His management style became legendary. Students and staff described a community in which they felt genuinely empowered to reach their full potential, and many creative scientific organizations that followed are said to model their collaborative culture on the example he set. Though the world knew him as Mr. Photosynthesis, his organizational genius touched every corner of the scientific community he influenced. He remained active in research until his retirement in 1980.

Beyond the Cycle: Later Work and Lasting Legacy

Calvin's career at the University of California, Berkeley, spanned roughly five decades, a tenure that began when Joel Hildebrand, director of the UC Radiation Laboratory, invited him to join the faculty during a visit to the University of Manchester. Hildebrand urged him to push forward in radioactive carbon research, declaring that now was the time. Calvin became the first non-Berkeley graduate hired by the chemistry department in more than twenty-five years. His early work at Berkeley built directly on the 1940 discoveries of Martin Kamen and Sam Ruben regarding long-lived radioactive carbon-14. In his final years of active research, Calvin turned his attention to oil-producing plants as renewable energy sources. He also devoted many years to investigating the chemical evolution of life, a line of inquiry that culminated in a book published in 1969. The 1961 Nobel Prize in Chemistry, awarded for his research on the carbon dioxide assimilation in plants, recognized not just a single mechanism but a way of thinking about how living systems capture and transform energy. Calvin died on January 8, 1997, leaving behind a cycle that bears his name and a model of scientific community that continues to inspire.