{{Short description|American biophysicist (1922–2011)}} {{Infobox scientist | name = Roderick K. Clayton | birth_name = Roderick Keener Clayton | other_names = Rod Clayton | birth_date = {{birth date|1922|3|29}} | birth_place = Tallinn, Estonia | death_date = {{death date and age|2011|10|23|1922|3|29}} | fields = Biophysics, photosynthesis | workplaces = Oak Ridge National Laboratory<br>Dartmouth College<br>Charles F. Kettering Research Laboratory<br>Cornell University | alma_mater = California Institute of Technology | doctoral_advisor = Max Delbrück | known_for = Photosynthetic reaction centers<br>Phototaxis in bacteria<br>Bacterial photosynthesis | awards = Guggenheim Fellowship<br>Biological Physics Prize }}
'''Roderick Keener Clayton''' (March 29, 1922 – October 23, 2011), known as '''Rod Clayton''', was an American biophysicist known for his work on bacterial photosynthesis and photosynthetic reaction centers. He studied phototaxis in ''Rhodospirillum rubrum'' and later helped establish the concept, isolation, and spectroscopic characterization of bacterial photosynthetic reaction centers. He was elected to the National Academy of Sciences in 1977.
==Early life and education== Clayton was born in Tallinn, Estonia, on March 29, 1922, to John H. Clayton and Helena Mullerstein.<ref name="NASbio">{{cite book |last1=Chrispeels |first1=Maarten J. |last2=Wraight |first2=Colin A. |title=Roderick K. Clayton, 1922–2011 |series=Biographical Memoirs |publisher=National Academy of Sciences |year=2014 |url=https://www.nasonline.org/wp-content/uploads/2024/06/clayton-roderick.pdf |access-date=2026-04-25}}</ref> His father was an American journalist working in Europe, and his mother was Estonian and worked at the American embassy in Tallinn.<ref name="NASbio" /> Clayton spent part of his childhood in Europe before his family moved to the United States when he was six years old. He later lived in the Chicago area and in Pasadena, California.<ref name="NASbio" />
Clayton enrolled at the California Institute of Technology, where he initially studied chemistry. His studies were interrupted by World War II, during which he served in the United States Army Air Forces.<ref name="NASbio" /> He trained at Blytheville Army Airfield in Arkansas and was later posted to Guam, where he flew missions over Japan.<ref name="Wraight2014">{{cite journal |last=Wraight |first=Colin A. |title=Roderick K. Clayton: a life, and some personal recollections |journal=Photosynthesis Research |year=2014 |volume=120 |issue=1–2 |pages=9–26 |doi=10.1007/s11120-013-9948-5 |pmid=24254320 }}</ref>
==Career== After completing his doctorate, Clayton worked with Cornelis Bernardus van Niel at Stanford University's Hopkins Marine Station.<ref name="NASbio" /> He then spent four years at the United States Naval Postgraduate School in Monterey, California, where he continued work on phototaxis, metabolism, and bacterial photosynthesis.<ref name="NASbio" />
In 1958, Clayton joined the biological division of Oak Ridge National Laboratory, where he worked on phototrophic bacteria and began research that led to his later work on bacterial reaction centers.<ref name="NASbio" /> He moved to Dartmouth Medical School in 1961 and to the Charles F. Kettering Research Laboratory in Yellow Springs, Ohio, in 1962.<ref name="NASbio" />
In 1966, Clayton joined Cornell University, where he held appointments in biological sciences and applied physics.<ref name="NASbio" /> He later became the Liberty Hyde Bailey Professor Emeritus in the Division of Plant Biology.<ref name="NASbio" />
==Research== Clayton's early research focused on phototaxis in the photosynthetic bacterium ''Rhodospirillum rubrum''. His doctoral and postdoctoral work examined the relationship between light, metabolism, and motility, including the response of bacteria to sudden changes in illumination.<ref name="NASbio" /><ref>{{cite journal |last=Clayton |first=R. K. |title=Studies in the phototaxis of Rhodospirillum rubrum. I. Action spectrum, growth in green light, and Weber law adherence |journal=Archiv für Mikrobiologie |year=1953 |volume=19 |issue=2 |pages=107–124 |doi=10.1007/BF00446395 |pmid=13159239}}</ref>
At Oak Ridge and later at Dartmouth and the Kettering Research Laboratory, Clayton turned increasingly to bacterial photosynthesis. Working with carotenoid-deficient mutants of ''Rhodobacter sphaeroides'', he identified spectroscopic changes associated with a specialized bacteriochlorophyll component involved in the primary reactions of photosynthesis. <ref>{{cite journal |last=Clayton |first=R. K. |title=Primary reactions in bacterial photosynthesis—I. The nature of light-induced absorbancy changes in chromatophores; evidence for a special bacteriochlorophyll component |journal=Photochemistry and Photobiology |year=1962 |volume=1 |issue=3 |pages=201–210 |doi=10.1111/j.1751-1097.1962.tb08093.x}}</ref> He used the term "photosynthetic reaction center" for the site of energy trapping and charge separation in bacterial photosynthesis.<ref name="NASbio" /><ref>{{cite journal |last=Clayton |first=R. K. |title=Toward the isolation of a photochemical reaction center in Rhodopseudomonas spheroides |journal=Biochimica et Biophysica Acta |year=1963 |volume=75 |pages=312–323 |doi=10.1016/0006-3002(63)90618-8 |pmid=14104940}}</ref>
Clayton's work contributed to the isolation and characterization of bacterial photosynthetic reaction centers. In the early 1970s, his laboratory and George Feher's laboratory independently purified minimal reaction center preparations from ''Rhodobacter sphaeroides''.<ref>{{cite journal |last1=Clayton |first1=Roderick K. |last2=Wang |first2=Richard T. |title=Photochemical reaction centers from Rhodopseudomonas spheroides |journal=Methods in Enzymology |year=1971 |volume=23 |pages=696–704 |doi=10.1016/S0076-6879(71)23145-1}}</ref>
Clayton's group also worked on the pigment composition, fluorescence properties, electron acceptors, and quantum efficiency of bacterial reaction centers.<ref>{{cite journal |last1=Clayton |first1=R. K. |last2=Haselkorn |first2=R. |title=Protein components of bacterial photosynthetic membranes |journal=Journal of Molecular Biology |year=1972 |volume=68 |issue=1 |pages=97–105 |doi=10.1016/0022-2836(72)90265-3 |pmid=4115110}}</ref><ref>{{cite journal |last1=Wraight |first1=C. A. |last2=Clayton |first2=R. K. |title=The absolute quantum efficiency of bacteriochlorophyll photooxidation in reaction centres of Rhodopseudomonas spheroides |journal=Biochimica et Biophysica Acta |year=1974 |volume=333 |issue=2 |pages=246–260 |doi=10.1016/0005-2728(74)90009-7 |pmid=19400037}}</ref> His later work included studies of fluorescence, energy transfer, and the organization of photosynthetic units. He also wrote books on the physical and chemical mechanisms of photosynthesis, including ''Light and Living Matter'' and ''Photosynthesis: Physical Mechanisms and Chemical Patterns''.<ref name="Wraight2014" /><ref>{{cite book |last=Clayton |first=Roderick K. |title=Photosynthesis: Physical Mechanisms and Chemical Patterns |series=IUPAB Biophysics Series |volume=4 |publisher=Cambridge University Press |year=1980 |isbn=9780521294430}}</ref>
==Honors and awards== Clayton was elected a fellow of the American Association for the Advancement of Science in 1965.<ref name="CornellObit">{{cite news |last=Shackford |first=Stacey |title=Professor Emeritus Rod Clayton, expert in photosynthesis, dies at 89 |work=Cornell Chronicle |date=November 15, 2011 |url=https://news.cornell.edu/stories/2011/11/professor-emeritus-rod-clayton-dies-89 |access-date=2026-04-25}}</ref> He was elected to the American Academy of Arts and Sciences in 1975 and the National Academy of Sciences in 1977.<ref name="NASbio" /><ref>{{cite web |title=Roderick Keener Clayton |publisher=American Academy of Arts and Sciences |url=https://www.amacad.org/person/roderick-keener-clayton |access-date=2026-04-25}}</ref>
He received Guggenheim Fellowships in 1973 and 1980.<ref>{{cite web |title=Roderick K. Clayton |publisher=John Simon Guggenheim Memorial Foundation |url=https://www.gf.org/fellows/roderick-k-clayton/ |access-date=2026-04-25}}</ref> In 1982, he and George Feher shared the first Biological Physics Prize of the American Physical Society, now known as the Max Delbruck Prize.<ref name="NASbio" /><ref name="Wraight2014" />
==Personal life== Clayton married Betty Jean Compton in 1944. They had a son and a daughter.<ref name="NASbio" /> Betty Jean Clayton worked with him in the laboratory for many years and helped maintain bacterial cultures used in his research.<ref name="NASbio" /><ref name="Wraight2014" />
After her death in 1981, Clayton's scientific career ended early, and Cornell negotiated his retirement in 1984.<ref name="NASbio" /><ref name="Wraight2014" /> He later lived in California, where he pursued photography, ceramics, drawing, butterfly collecting, and work with service dogs.<ref name="NASbio" /><ref name="Wraight2014" /> Clayton died on October 23, 2011, at the age of 89.<ref name="CornellObit" />
==References== {{Reflist}}
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{{DEFAULTSORT:Clayton, Roderick K.}} Category:1922 births Category:2011 deaths Category:American biophysicists Category:Cornell University faculty Category:Researchers of photosynthesis Category:California Institute of Technology alumni Category:United States Army Air Forces pilots of World War II Category:Members of the United States National Academy of Sciences Category:Fellows of the American Academy of Arts and Sciences Category:Fellows of the American Association for the Advancement of Science