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8,913 Matching Results
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8,905 - 8,913 of
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ABSOLUTE ASYMMETRIC SYNTHESIS. I. ON THE MECHANISM OF THEPHOTOCHEMICAL ABSOLUTE ASYMMETRIC SYNTHESIS OF HELICENES WITH CIRCULARLYPOLARIZED LIGHT. . WAVELENGTH DEPENDENCE OF THE OPTICAL YIELD OFOCTAHELICENE.
The synthesis of nonracemic yields of hexa-, hepta-, octa-, and nonhelicene with circular light was observed, and the structural and wavelength dependence of the induced optical yields was examined. The results obtained, together with a detailed consideration of the mechanism of helicene synthesis from the parent diarylolefins, indicate that the induced optical activity is due to selective reaction of enantiomeric conformations of the parent cis diarylolefins by circular light.
Date:
May 1, 1971
Creator:
Bernstein, William J.; Calvin, Melvin & Buchardt, Ole.
System:
The UNT Digital Library
SPECTROSCOPIC INVESTIGATION OF THE INHIBITORY EFFECT OF FATTYACIDS ON PHOTOSYNTHETIC SYSTEMS
Fatty acids have a reversible inhibitory effect on respiration and on photosynthetic action. They investigated the influence of octanoic acid on the photosynthetic bacteria Rhodopseudomonas spheroids R-26. From the spectroscopic data they conclude that a less efficient energy transfer and decoupling of the light harvesting pigment system from the energy converting reaction center is responsible for the inhibitory effect.
Date:
May 1, 1971
Creator:
Steffea, Hans & Calvin, Melvin.
System:
The UNT Digital Library
SYNCHROTRON RADIATION AND RING FORMATION IN THE ELECTRON RING ACCELERATOR
We discuss the possibility of using synchrotron radiation to form electron rings having a very high electric field to hold the ions inside the ring. The formulas describing bow the energy and the dimension of the ring change under the effect of synchrotron radiation are derived, and a numerical example is given.
Date:
May 13, 1970
Creator:
Pellegrini, C.
System:
The UNT Digital Library
CONSIDERATIONS ON THE DISTRIBUTION OF IONS BETWEEN AN ORGANIC SOLUTION OF ALKYL-AMMONIUM SALTS AND AN AQUEOUS SOLUTION OF INORGANIC SALTS IN THE PRESENCE OF HOMOPOLYMERS AND HETEROPOLYMERS IN THE ORGANIC PHASE
None
Date:
May 1, 1966
Creator:
Scibona, G.
System:
The UNT Digital Library
Isobaric-spin splitting of nuclear excitations
None
Date:
May 1, 1966
Creator:
Macfarlane, M H
System:
The UNT Digital Library
BINDING ENERGIES OF NUCLEAR TWO, THREE AND FOUR-BODY SYSTEMS
None
Date:
May 1, 1965
Creator:
Tang, Y.C.; Schmid, E.W. & Herndon, R.C.
System:
The UNT Digital Library
CYANAMIDE: A POSSIBLE KEY COMPOUND IN CHEMICAL EVOLUTION
The prebiotic synthesis of phosphorus-containing compounds--such as nucleotides and polynucleotides--would require both a geologically plausible source of the element and pathways for its incorporation into chemical systems on the primitive Earth. The mineral apatite, which is the only significant source of phosphate on Earth, has long been thought to be problematical in this respect due to its low solubility and reactivity. However, in the last decade or so, at least two pathways have been demonstrated which would circumvent these perceived problems. In addition, recent results would seem to suggest an additional, extraterrestrial source of reactive phosphorus. It appears that the 'phosphorus problem' is no longer the stumbling block which it was once thought to be.
Date:
May 1, 1964
Creator:
Steinman, Gary; Lemmon, Richard M. & Calvin, Melvin
System:
The UNT Digital Library
In-reactor corrosion: A paper presented at the 9th annual AEC Corrosion Symposium, Boston, Massachusetts, May 10--12, 1960
Object of this paper is to present preliminary results of experiments in Hanford in-reactor loops to determine if exposure to neutrons will increase corrosion rates of Al alloys, Zy-2, and 304 stainless steel. Results were negligible or no corrosion.
Date:
May 9, 1960
Creator:
Larrick, A. P.
System:
The UNT Digital Library
Minutes of third meeting of committee on use of Nevada Test Site
The Nevada Test Site (NTS) Use Committee met Tuesday morning, May 28, 1957, at Mercury, Nevada. This document provides a summary of the meeting.
Date:
May 28, 1957
Creator:
Lindquist, C. L.
System:
The UNT Digital Library