Search results
Results from the WOW.Com Content Network
He invited Calvin to push forward in radioactive carbon research because "now was the time". [6] Calvin's original research at UC Berkeley was based on the discoveries of Martin Kamen and Sam Ruben in long-lived radioactive carbon-14 in 1940.
Carbon-14, C-14, 14 C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic matter is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples.
The cycle was discovered in 1950 by Melvin Calvin, James Bassham, and Andrew Benson at the University of California, Berkeley by using the radioactive isotope carbon-14. [4] Photosynthesis occurs in two stages in a cell.
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby.
Melvin Calvin and Andrew Benson delineate the path of carbon in photosynthesis using Chlorella and carbon dioxide labeled with carbon-14 (14 CO 2) (1945–1954). Erwin Chargaff disproves the "tetranucleoide theory" of DNA structure and determines that the composition of double-stranded DNA follows the rule, %A = %T and %G = %C (Chargaff's rule ...
The calculation of radiocarbon dates determines the age of an object containing organic material by using the properties of radiocarbon (also known as carbon-14), a radioactive isotope of carbon. Radiocarbon dating methods produce data based on the ratios of different carbon isotopes in a sample that must then be further manipulated in order to ...
Carbon 14 and photosynthesis – Martin Kamen and Sam Ruben first discovered carbon 14 in 1940, and Nobel laureate Melvin Calvin and his colleagues used carbon 14 as a molecular tracer to reveal the carbon assimilation path in photosynthesis, known as Calvin cycle. [141] Carcinogens – Identified chemicals that damage DNA.
Melvin Calvin – University Professor of Chemistry (1937–1980); [122] 1989 National Medal of Science "for his pioneering studies in the mechanism of photosynthesis and bioenergetics, and for the application of scientific theory toward the solution of the most fundamental problems of the age-energy, food, chemical and viral carcinogenesis ...