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The Primary Quantum Conversion Process in Photosynthesis: ElectronSpin Resonance

Description: Photoinduced electron spin resonance signals have been observed in isolated chloroplasts and other green materials with a growth time not affected by reducing the temperature to -140 deg. This is interpreted in terms of conduction-band and trapped-electron theory.
Date: January 28, 1957
Creator: Calvin, Melvin & Sogo, Power B.
Partner: UNT Libraries Government Documents Department

Energy Conversion in Photosynthetic Processes

Description: The concepts of solid-state photophysics are applied to biological materials, especially particulate matter derived from green plants. Photoinduced electron-spin resonance signals have been observed in isolated chloroplasts and other green plant materials; their growth time is not affected by reducing the temperature to -140 C. The luminescence of these materials has also been investigated under a variety of conditions. The results of these studies have been shown to be consistent with a mechanism involving the recombination of electrons and holes trapped in a quasi-crystalline lattice. Some details of such a mechanism have been proposed that suggest the mode of entry of the light energy into the photosynthetic pathway.
Date: March 10, 1958
Creator: Tollin, Gordon; Sogo, Power B. & Calvin, Melvin
Partner: UNT Libraries Government Documents Department

The Electron Spin Resonance Spectrum of Dibenzene ChromiumCation

Description: The electron spin paramagnetic resonance of dibenzene chromium cation h a s been observed. I t s c e n t e r is a t a valhe of g = 1.98. I t shows eleven hyperfine components s e p a r a t e d by 3.5 gauss. These a r e i n t e r p r e t e d to b e eleven of the thirteen components expected to r e s u l t f r o m the interaction of the twelve equivalent protons with the unpaired electron.
Date: December 20, 1956
Creator: Feltham, Robert D.; Sogo, Power & Calvin, Melvin
Partner: UNT Libraries Government Documents Department

ELECTRON-SPIN-RESONANCE STUDIES ON PHOTO-SYNTHETIC MATERIALS

Description: A number of organisms have been examined for their ability to produce electron-spin-resonance signals at low temperatures in response to illumination. The efficiency of the response is of the order of not less than 5%, and the wavelength for maximum response is generally slightly on the longer side of the wavelength of maximum absorption, with a minimum appearing at the wavelength of maximum absorption.
Date: May 11, 1960
Creator: Sogo, Power B.; Carter, Louise A. & Calvin, Melvin.
Partner: UNT Libraries Government Documents Department

The Free Radical from Perinaphthene

Description: The electron spin resonance spectrum of the perinaphthene free radical is reported and a discussion of electron spin density in this radical is given.
Date: January 31, 1957
Creator: Sogo, Power B.; Nakazaki, Masao & Calvin, Melvin
Partner: UNT Libraries Government Documents Department