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Ralph Walter Graystone Wyckoff, Sr. (August 9, 1897 – November 3, 1994), or simply Ralph Wyckoff, was an American chemist and pioneer of X-ray crystallography. He also made contributions to vaccine developments against epidemic typhus and other viruses.

Biography

Wyckoff was the son of judge Abram Ralph Wyckoff and Ethel Agnes Catchpole. He studied at Hobart College, where he obtained a Bachelor of Science in 1916. He continued his studies at Cornell University, where he obtained his Ph.D. in 1919. In 1916, he published his first scientific paper (of more than 400) at the age of nineteen in the Journal of the American Chemical Society. Under Shoji Nishikawa, he presented his thesis about the crystallographic resolution of the structures of NaNO₃ and CsICl₂ in 1919.

Wyckoff continued working in X-ray crystallography and wrote several books about the topic. Wyckoff's 1922 book, The Analytical Expression of the Results of the Theory of Space Groups, contained tables with the positional coordinates, both general and special, permitted by the symmetry elements. This book was the forerunner of International Tables for X-ray Crystallography, which first appeared in 1935. Both general and special positions are also called Wyckoff positions in his honor.

In 1927, Wyckoff moved to the Rockefeller University (then called The Rockefeller Institute for Medical Research) to take up studies of bacteria and, especially, viruses. While there, he photographed the growth of living cells using ultraviolet light and determined the structure of urea. He left Rockefeller in 1937. After leaving there, he worked in private industry on the Western equine encephalitis virus. This work resulted to the creation of a vaccine against it. During World War II, he developed a vaccine against epidemic typhus. In 1943, he moved to Michigan where he worked for the University of Michigan and the Michigan State Department of Health. In Ann Arbor, he invented a technique to take three-dimensional electron microscope images of bacteria using a "metal shadowing" technique. Robley C. Williams worked with him to develop the technique. From 1946 to 1952, he researched macromolecules and viruses at the National Institutes of Health in Bethesda, Maryland. In 1948, he helped found the International Union of Crystallography and served as vice-president and president from 1951 to 1957. In 1959, appalled by growing bureaucracy at the NIH, he took the job of professor of microbiology and physics at the University of Arizona in Tucson, where he was forced to retire at the age of 80.

Wyckoff was married two times, the first time producing one son Ralph W.G. Wyckoff, Jr., the second marriage resulted in three daughters.

Wyckoff was elected member of the National Academy of Sciences in 1949 and Foreign member of the Royal Society, on April 19, 1951.

Bibliography

• Wyckoff, Ralph W. G (1922). The determination of the structure of crystals. Washington. OCLC 29075986.{{cite book}}: CS1 maint: location missing publisher (link)
• Wyckoff, Ralph W. G (1922). The analytical expression of the results of the theory of space-groups. Washington: The Carnegie Institution of Washington. OCLC 1161172643.
• Wyckoff, Ralph W. G (1923). A survey of existing crystal structures data. Philadelphia and London: J.B. Lippincott Company. OCLC 796815710.
• Wyckoff, Ralph W. G (1924). The structure of crystals. New York: The Chemical Catalog Company, Inc. OCLC 3557647.
• Wyckoff, Ralph Walter Graystone (1949). Electron microscopy: technique and applications. New York: Interscience publ. OCLC 884419705.
• Wyckoff, Ralph W. G (1958). The world of the electron microscope. New Haven: Yale Univ. Press. OCLC 537057.
• Wyckoff, Ralph W. G (1972). The biochemistry of animal fossils. Bristol: Scientechnica. ISBN 978-0-85608-004-3. OCLC 925370875.
• Wyckoff, Ralph W. G (1982). Crystal structures. Malabar; Florida: R.E. Krieger. ISBN 978-0-89874-387-6. OCLC 34458678.

References

1. Gelder, Lawrence Van (1994-11-09). "Ralph W. G. Wyckoff, 97, Dies; Led Research on Crystallography". The New York Times. ISSN 0362-4331. Retrieved 2024-05-19.
2. "RALPH W. G. WYCKOFF (1897 - 1994)". xray-exhibit.scs.illinois.edu. Retrieved 2024-05-19.
3. Asimov, Asimov's Biographical Encyclopedia of Science and Technology 2nd Revised edition
4. "Science: Rochester Paragon" Time Monday Feb 6, 1933. Accessed online at on 3/23/2010
5. ^ "Ralph W. G. Wyckoff 1897-1994," Acta Crystallogr. (1995). A51, 649-650. Accessed online at http://ww1.iucr.org/people/wyckoff.htm on 3/23/2010
6. "August 9 - Today in Science History - Scientists born on August 9th, died, and events".

External links

• https://www.iucr.org/publ/50yearsofxraydiffraction/full-text/wyckoff
• https://www.iucr.org/people/crystallographers/ralph-w.-g.-wyckoff-1897-1994

v t e Crystallography
Key concepts	Timeline of crystallography Crystallographers Metallurgy Biocrystallography Structure Unit cell Bravais lattice Miller index Point group Reciprocal lattice Restriction theorem Periodic table Structure prediction Systems Cubic Hexagonal Monoclinic Orthorhombic Tetragonal Triclinic Growth Crystallite Equiaxed Twinning Fiveling Aperiodic crystal Quasicrystal Phase transition Phase diagram Eutectic Miscibility gap Polymorphism Liquid crystal Phase transformation crystallography Precipitation Segregation Spinodal decomposition Supersaturation GP-zone Ostwald ripening Defects Grain boundary Disclination CSL Growth Abnormal growth Perfect crystal Stacking fault Dislocation Burgers vector Partial dislocation Kink Cross slip Frank–Read source Cottrell atmosphere Peierls stress GND Lomer–Cottrell junction Slip Slip bands Interstitials Bjerrum defect Frenkel defect Wigner effect Vacancy Schottky defect F-center Stone–Wales defect Defects in diamond Bragg's law Bragg plane Ewald's sphere Friedel's law Hermann–Mauguin notation Structure factor Thermal ellipsoid
Characterisation	Electron Diffraction Scattering Neutron Diffraction Scattering Nuclear magnetic resonance X-ray Diffraction Scattering
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Category Commons

• Cornell University alumni
• Hobart and William Smith Colleges alumni
• University of Arizona faculty
• Wyckoff family
• 1994 deaths
• 1897 births
• Foreign members of the Royal Society
• University of Michigan staff
• Presidents of the American Crystallographic Association
• Rockefeller University people
• Fellows of the American Physical Society
• National Institutes of Health people
• People from Geneva, New York
• American crystallographers