The Svedberg

The Svedberg
Name	The Svedberg
Birth date	1884
Birth place	Växjö
Death date	1971
Nationality	Sweden
Field	Chemistry, Biochemistry
Known for	Ultracentrifuge, Svedberg unit
Awards	Nobel Prize in Chemistry

The Svedberg was a Swedish physical chemist and Nobel laureate known for pioneering work on colloids, sedimentation, and the development of the ultracentrifuge. His research connected experimental apparatus such as the ultracentrifuge to theoretical frameworks in Jean Perrin-era studies and influenced institutions like the University of Uppsala and KTH Royal Institute of Technology. He contributed to techniques used in laboratories at Rockefeller University, Max Planck Society, and Institut Pasteur.

Definition and units

The svedberg is a non-SI unit of time used to express a particle's sedimentation coefficient; it is symbolized by S and equals 10^−13 seconds. Sentences discussing characteristic quantities often reference standards established by International System of Units bodies and measurement protocols from International Union of Pure and Applied Chemistry and International Electrotechnical Commission. In literature alongside units like the dalton, the angström, and the kilodalton, the svedberg appears when reporting results from instruments produced by firms such as Beckman Coulter, Eppendorf, and Thermo Fisher Scientific.

Historical background and The Svedberg biography

Gunnar Svedberg trained during the early 20th century amid contemporaries including Theodor Svedberg's collaborations with figures at Karolinska Institute and exchanges with researchers linked to Nobel Prize in Chemistry committees. His career intersected with laboratories at Uppsala University, partnerships with industrial groups like ASEA, and dialogues with scientists from University of Cambridge, University of Oxford, and Harvard University. Events such as the expansion of Roentgen Society-era experimental physics and cross-disciplinary meetings with representatives from Royal Society and Academy of Sciences (France) shaped dissemination of ultracentrifugation techniques.

Measurement methods and instrumentation

Sedimentation coefficients measured in svedbergs are determined by analyzing particle motion in high-speed centrifugation fields created by devices developed by Theodor Svedberg and commercialized by Beckman Coulter and others. Protocols combine temperature control from firms like Thermo Fisher Scientific with optics originally adapted from designs at Carl Zeiss AG and detectors influenced by RCA and Philips. Methods include boundary sedimentation, velocity sedimentation, and equilibrium ultracentrifugation, techniques refined at institutions such as Cold Spring Harbor Laboratory, Max Planck Institute for Biophysical Chemistry, and Wellcome Trust Sanger Institute.

Applications in biochemistry and molecular biology

Reporting of ribosomal subunits, viral particles, and macromolecular complexes routinely uses svedberg values—for example, 70S and 50S subunits characterized in studies at Stanford University, Massachusetts Institute of Technology, and University of California, Berkeley. Work on ribosome assembly, tRNA interactions, and viral capsid characterization at centers like Johns Hopkins University, Pasteur Institute, and Salk Institute employ ultracentrifugation data expressed in svedbergs. Clinical and industrial labs at Centers for Disease Control and Prevention and Food and Drug Administration reference sedimentation coefficients when assessing vaccine components, while structural biology groups at European Molecular Biology Laboratory and Riken correlate svedberg-based separation with cryo-electron microscopy and X-ray crystallography findings.

Relation to sedimentation coefficient theory

The svedberg quantifies the sedimentation coefficient s = v/ω^2r where v is velocity, ω angular velocity, and r radius, linking experimental results to theoretical treatments by Ludwig Boltzmann-inspired statistical mechanics and hydrodynamic models from Osborne Reynolds and Stokes. Analyses use frictional coefficients and partial specific volumes discussed in work by James Watson-era molecular biology and thermodynamic formulations echoed in texts from Linus Pauling and Perrin. Modern computational approaches developed at Los Alamos National Laboratory and Lawrence Berkeley National Laboratory integrate svedberg-derived parameters with simulations from groups at Stanford Linear Accelerator Center and Argonne National Laboratory.

Notation, conversions, and common values

Notation uses uppercase S for svedberg; 1 S = 10^−13 s, so 1 kS = 10^−10 s, though typical macromolecular values range from 1 S to several hundred S. Commonly reported values include 4S for small globular proteins studied at University of Minnesota and 80S for eukaryotic ribosomes reported in work at University of Cambridge and ETH Zurich. Conversion practices are taught in courses at Massachusetts Institute of Technology, Princeton University, and Yale University and standardized in protocols from American Society for Biochemistry and Molecular Biology and Royal Society of Chemistry.

Category:Units of time Category:Biochemistry Category:History of chemistry