24 Matching Results

Search Results

open access

THE PHOTOCHEMISTRY OF PYRIDINE N-OXIDE

The authors wish to report their results on the photolysis of pyridine N-oxide in alcoholic solution. Both methanol and ethanol solutions of pyridine N-oxide were irradiated. The reaction mixture was analyzed by gas-liquid chromatography (GLC) using a 2.5% FFAP on Chrom G column and a Porapak Q column. In order to collect the products, the volume of the photolysis solution was reduced in vacuo and the resulting mixture was separated by preparative GLC.

Date: September 14, 1967

Creator: Alkaitis, Algis & Calvin, Melvin.

Partner: UNT Libraries Government Documents Department

open access

VOLATILE SILICON COMPLEXES OF ETTOPORPHY-RIN I

The presence of several homologous series of porphyrins have been demonstrated in some oil shale rocks, shale oils, and petroleums. However, the application of microanalytical techniques (i.e., mass spectrometry and gas chromatography) to structure determination has been limited due to the low volatility of the porphyrin components. The authors report the synthesis of several novel Si(IV) etioporphyrin I derivatives and the effects that their various additional silicon ligands have on porphyrin… more

Date: July 31, 1967

Creator: Boylan, D. B. & Calvin, M.

Partner: UNT Libraries Government Documents Department

open access

MEASUREMENT OF THE SIGMA- POLARIZATION IN THE REACTION pi- + p-->SIGMA- + K+

The average polarization of the {Sigma}{sup -} produced in the reaction {pi}{sup -} + p {yields} {Sigma}{sup -} + K{sup +} has been measured between center-of-mass angles 134{sup o} and 166{sup o} for an incident {pi}{sup -} momentum of 1145 MeV/c. A polarized proton target was used, and the {Sigma}{sup -} polarization was found by measuring the difference in the production-rate of K{sup +} mesons for protons polarized along the production-plane normal and against it. Spark chambers were used t… more

Date: October 1, 1967

Creator: Weldon, D.; Steiner, H.; Shapiro, G.; Schultz, C; Johnson, C.H.; Holloway, L. et al.

Partner: UNT Libraries Government Documents Department

open access

THERMODYNAMICS OF LIGHT EMISSION AND FREE-ENERGY STORAGE INPHOTOSYNTHESIS

A Planck law relationship between absorption and emission spectra is used to compute the fluorescence spectra of some photosynthetic systems from their absorption spectra. Calculated luminescence spectra of purple bacteria agree well but not perfectly with published experimental spectra. Application of the Planck law relation to published activation spectra for Systems I and II of spinach chloroplast permits independent calculation of the luminescence spectra of the two systems; if the luminesc… more

Date: April 1, 1967

Creator: Ross, Robert T. & Calvin, Melvin

Partner: UNT Libraries Government Documents Department

open access

Organic Geochemical Studies. Ii. The Distribution of Aliphatichydrocarbons in Algae, Bacteria, and in a Recent Lake Sediment: Apreliminary Report

The theory that algal oozes could give rise to oil shales is not a recent one. Evidence for this theory rests on the finding that algae have less cellulose and a correspondingly greater proportion of lipids than most plant material. In addition, the contemporary alga Botyrococcus is present in microscopic remains in some organic oozes. Since the algal ooze precursor theory rests primarily on geological and paleobotanical evidence, they have sought to complement this evidence by making a study o… more

Date: November 1, 1967

Creator: Han, Jerry; McCarthy, E. D.; Van Hoeven, William, Jr.; Calvin, Melvin & Bradley, W. H.

Partner: UNT Libraries Government Documents Department

open access

CHARGE TRANSFER COMPLEXES WITH HEXAFLUDROBENZENE ANDPENTAFLUOROBENZONITRILE AS ACCEPTOR COMPONENTS

Charge transfer associations are a well-established phenomena and a rather extensively investigated one also. Since the acceptor component of such complexes normally does not exist as a liquid under standard conditions, they wish to report on two organic liquids which function as acceptor components with suitable complimentary molecules. As indicated in Figure 1 (the presence of an extended shoulder in the spectra of the mixture), pentafluorobenzonitrile (PFBN) complexes with N,N,N{prime},N{pri… more

Date: October 31, 1967

Creator: Corker, Gerald A. & Calvin, Melvin

Partner: UNT Libraries Government Documents Department

open access

ORGANIC GEOCHEMICAL STUDIES. I. MOLECULAR CRITERIA FOR HYDROCARBONGENESIS

In recent years the search for life-forms at the earliest periods of geological time has been continued not only at the morphological level but also at the molecular level. This has been possible as a result of the increase in the biochemical knowledge and with the advent of analytical techniques that are capable of describing the intimate molecular architecture of individual molecules in acute detail. The fundamental premises upon which this organic geochemical approach rest are the following:… more

Date: September 22, 1967

Creator: McCarthy, Eugene D. & Calvin, Kevin

Partner: UNT Libraries Government Documents Department

open access

TRITIUM INCORPORATION STUDIES IN PHOTO-SYNTHETIC BACTERIA

Although the detailed pathway of carbon, by which carbohydrates are formed from carbon dioxide during photosynthesis, has been established, comparatively little is known about the participation and transport of hydrogen in the complex series of reactions now known to be involved in photosynthesis. The transport of hydrogen may occur concurrently with the redox reactions of photosynthetic electron transport leading to the formation of ATP, as well as in the reduction of carbon dioxide. The parti… more

Date: July 1, 1967

Creator: Dehner, Thomas R.; Chan, W.-S.; Caple, Marianne B. & Calvin, M.

Partner: UNT Libraries Government Documents Department

open access

PRODUCT ENERGY AND ANGULAR DISTIBUTIONS FROM THE REACTION OP N2+WITH ISOTOPIC HYDROGEN MOLECULES

The energy and angular distributions of N{sub 2}H{sup +} and N{sub 2}D{sup +} formed when a beam of N+2 passes through a scattering cell containing H{sub 2}, D{sub 2}, or HD have been measured at relative kinetic energies ranging from 2.3 to 11.6 eV. From some experiments, intensity contour maps that show the complete product velocity vector distribution in the centre of mass system have been generated. Although backward recoil scattering occurs at all energies, most products are scattered forw… more

Date: June 1, 1967

Creator: Gentry, W.R.; Gislason, E.A.; Lee, Yuan-tseh; Mahan, B.H. & Tsao,Chi-wing.

Partner: UNT Libraries Government Documents Department

open access

IRRADIATION OF 3- SUBSTITUTED-2-PHENYLOXAZIRIDINES

It was noted previously that 3-(p-dimethylamino)-2-phenyloxaziridine (I) and 3-(p-dimethylamino)-2-(m-nitrophenyl)oxaziridine were photosensitive. Further study on the irradiation (in a variety of solvents under nitrogen) of (I), 2,3-diphenyloxaziridine (II), and 3-(p-nitrophenyl)-2-phenyloxaziridine (III) indicates the major photoreaction to be cleavage to the aldehyde and an intermediate which forms aniline and azobenzene. There is also formed in the photolysis varying amounts of the correspo… more

Date: August 30, 1967

Creator: Splitter, Janet S. & Calvin, Melvin.

Partner: UNT Libraries Government Documents Department

open access

Electron Paramagnetic Resonance Studies of Electron-Irradiated Lithium Sulfate at Liquid Nitrogen Temperature

No Description Available.

Date: January 1, 1967

Creator: Aseltine, Clifford L. & Kim, Y. W.

Partner: UNT Libraries Government Documents Department

open access

The first weighing of plutonium

The following text, transcribed from the remarks of those scientists who gathered at the University of Chicago on September 10, 1967, to celebrate the 25th anniversary of the first weighing of plutonium, tells an important part of the story of this fascinating new element that is destined to play an increasingly significant role in the future of man.

Date: September 10, 1967

Partner: UNT Libraries Government Documents Department

open access

PLUTONIUM EXCRETION FOLLOWING CONTAMINATED ACID BURNS AND PROMPT DTPA TREATMENTS.

No Description Available.

Date: January 1, 1967

Creator: Lagerquist, C.R.; Allen, I.B. & Holman, K.L.

Partner: UNT Libraries Government Documents Department

open access

Proceedings of the First International Symposium on the Biological Interpretation of Dose from Accelerator-Produced Radiation, Held at the Lawrence Radiation Laboratory, Berkeley, California, March 13--16, 1967

The objective of the meeting was to provide a companion meeting to the ''First Symposium on Accelerator Radiation Dosimetry and Experience'' which was held November 3-5, 1965, at the Brookhaven National Laboratory. This first symposium was limited in scope to an intensified discussion of dosimetry techniques. The biology which is associated with high energy radiation was specifically excluded, since it was the original plan to hold a second symposium devoted entirely to biology. Thus the presen… more

Date: March 13, 1967

Creator: Wallace, R.

Partner: UNT Libraries Government Documents Department