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3,026 Matching Results

Start Over Year 1971 Day 1st

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[Photograph 2012.201.B0301B.0328]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Rebecca Hume, points out features on one of her fossils."

Date: April 1, 1971

Creator: Albright, Bob

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B0350.0415]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "ENID - Garfield County State's Senate seat remains in the Republican column as Enid attorney Norman Lamb defeated his Democratic opponent, Hugh Thurman, in a special election Tuesday."

Date: January 1, 1971

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B0297B.0483]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Children need little urging to gather around the piano of their pretty teacher, Mrs. Beverly Hoster."

Date: June 1, 1971

Creator: Miller, Joe

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B0410B.0645]

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Maze of construction equipment and materials is shown in this view of work at the Myriad Convention Center, giving some idea of the gigantic size of the arena."

Date: March 1, 1971

Creator: Albright, Bob

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B0410B.0890]

Photograph used for a newspaper owned by the Oklahoma Publishing Company.

Date: March 1, 1971

Creator: Albright, Bob

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B0420.0043]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "J. G. McBride, Stillwater"

Date: August 1, 1971

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B0403.0530]

Caption: "MONUMENT commemorating 50th anniversary of the first use of the reflection seismograph in oil exploration was dedicated Thursday at the Belle isle Branch Library."

Date: April 1, 1971

Creator: Taylor, Robert

Object Type: Photograph

System: The Gateway to Oklahoma History

(open access)

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.

Object Type: Article

System: The UNT Digital Library

(open access)

SEARCH FOR MAGNETIC MONOPOLES IN LUNAR MATERIAL

None

Date: June 1, 1971

Creator: Eberhard, Philippe H.; Ross, Ronald R.; Alvarez, Luis W. & Watt,Robert D.

Object Type: Article

System: The UNT Digital Library

(open access)

SPECIFIC PROTONATION OF THE CARCINOGEN 7, 12-DIMETHYIBENZ [a]ANTHRACENE AND CHARGE LOCALIZATION IN THE a-COMPLEX

In the class of the polycondensed aromatic hydrocarbons, the concept of localized charge in a {sigma}-complex, e.g., the carbonium ion formed by addition of a proton or other electrophile to an aromatic ring, has so far received experimental evidence only in the case of anthracene. The ultraviolet spectrum of this compound in sulfuric acid is similar to that of the benzhydryl cation. Ph{sub c}C{sup +}Me. This result implies the protonation of anthracene at one meso-carbon atom and the localization of the positive charge at the other. The {sigma}-complex of the potent carcinogen 7,12-dimethylbenz[a]anthracene (DMBA) in acidic medium offers another example of this type of charge localization. The determination of structure was achieved by comparing the NMR spectra of DMBA in neutral and acidic solvents. The ratio of the integrated intensities of the proton peaks in the spectrum of DMBA is, from right to left, 3:3:5:1:1:2:1. The assignment of the 7-CH{sub 3} ({sigma}3.00) and 12-CH{sub 3} ({sigma}3.29) resonances was made by comparison with the spectra of 7-methylbenz[a]anthracene (7-CH{sub 3}, {sigma}3.03) and 12-methylbenz[a]anthracene (12-CH{sub 3}, {sigma}3.32) under the same conditions. A good general correlation exists between the methyl chemical shifts of the twelve monosubstituted methylbenzanthrancenes and the corresponding aryl protons of benzanthracene.

Date: April 1, 1971

Creator: Cavalieri, Ercole & Calvin, Melvin.

Object Type: Report

System: The UNT Digital Library

(open access)

PHOTOCHEMICAL COUPLING OF BENZO [a]PYRENE WITH 1-METHYL-CYTOSINE;PHOTO-ENHANCEMENT OF CARCINOGENICITY

Irradiation of the carcinogenic benzo[a]pyrene (I) with 1-methylcytosine hydrochloride IIa (molar ratio 1:10) at 3500 {angstrom} in methanol-acetone produces the 6-(1-methylcytos-5-yl)-benzo[a]pyrene (III). The structure of the product shows the hydrocarbon bound through the most active 6-carbon atom to the nucleophilic 5-position of the base. In the second part, the possibility of observing carcinogenic effects on the mouse skin from non-carcinogenic hydrocarbons under the action of UV light is investigated. Both experiments provide evidence that the 4,5-double bond (K region) of I presumably does not play a role in triggering the cancer process.

Date: January 1, 1971

Creator: Cavalieri, E. & Calvin, Melvin.

Object Type: Report

System: The UNT Digital Library

(open access)

Mechanism Op Action Op P-Hydroxybenzoate Hybrozylase Frompseudomonas Putida. Iii. The Enzyme-Subtrate Complex

The mechanism of action of p-hydroxybenzoate hydroxylase from Pseudomonas putida, strain M-6, has been investigated. The aromatic substrate analogues, benzoate, p-fluorobenzoate, p-chlorobenzoate, p-nitrobenzoate, p-aminobenzoate, and 6-hydroxynicotinate, are found to be competitive inhibitors. This finding differs from the previously reported noncompetitive behavior in a different buffer system. The optical activity of the enzyme-inhibitor complex is studied. From the kinetic and circular dichroism (CD) measurements, they have found that the carboxyl moiety is necessary and sufficient for the enzyme-substrate binding, whereas the hydroxyl group alone will not lead to binding. There are two classes of inhibitory analogues: one causes changes in CD spectra of the enzyme similar to those evoked by the substrate, and the other does not cause significant changes. the results indicate that more than one mode of enzyme-inhibitor interaction is involved. The CD of the enzyme-NADPH complex under anaerobic conditions suggests that the oxidized enzyme and reduced pyridine nucleotide form a complex, both in the absence and presence of the substrate, p-hydroxybenzoate. Furthermore, evidence for a ternary complex is given.

Date: April 1, 1971

Creator: Teng, Nelson N. H.; Kbtovycz, George; Calvin, Melvin & Hosokawa, Keiichi

Object Type: Report

System: The UNT Digital Library

(open access)

BEAM-SURROUNDING INTERACTIONS AND THE STABILITY OF RELATIVISTIC PARTICLE BEAMS

In accord with recent custom, the organizing committee for this conference has scheduled this review paper on beam instabilities. In view of the various review papers which already exist and the fact that the fundamentals of the subject have even been treated in a textbook, I thought this paper might best be devoted to a limited part of the rather large field of beam instabilities. Thus, I have selected only an aspect of the general subject, but an aspect which has during the last years been very much at the center of activity, and will--if my judgment is correct--be even more so in the years to come. I wish to concentrate, here, on the interaction of a relativistic particle beam with itself which is a result of the coupling of the beam with its surroundings. Before approaching this topic, a few remarks on the existing review papers are in order. A comprehensive treatment of beam instabilities may be found in Ref. 1, where, also, the reader will find some 48 references to the original literature. In Refs. 2 and 3, the General subject is approached from other points of view. Reference 4 is concerned with some special topics, but treats …

Date: February 1, 1971

Creator: Sessler, Andrew M.

Object Type: Article

System: The UNT Digital Library

(open access)

An Analog Method for Measuring the Longitudinal Coupling Impedance of a Relativistic Particle Beam With Its Environmnet

The stability of a coasting beam against self-bunching (negative mass instability) may be expressed in terms of a beam coupling impedance. The impedance has contributions from self-fields, wall impedance, and curvature effects. This paper describes procedures for measuring the wall and curvature contributions to the coupling impedance by means of an analog in which the beam is replaced by a conductor propagating a TEM-like mode. Conditions are derived under which the measurements are valid, various measurement procedures are described and results of the application of the method to the compressor of an electron ring accelerator are reported.

Date: August 1, 1971

Creator: Faltens, A.; Hartvig, E. C.; Mohl, D. & Sessler, A. M.

Object Type: Report

System: The UNT Digital Library

(open access)

ORBITAL SYMMETRY CONTROL IN THE NITRONE-OXAZIRIDINE SYSTEM.NITRONE PHOTOSTATIONARY STATES

Recent the orbital symmetry rules have been shown to apply to hetero-atom systems such as nitrone thermal cycloaddition reactions and the thermal and photochemical aziridine ring cleavage at the C-C bond. The concerted photocyclization is disrotatory and the reverse thermal cleavage is conrotatory in these molecules with four {pi} electrons. In contrast to the azomethine ylide-aziridine system, the stereochemistry of the nitrone photocyclization to oxaziridine can only be observed on carbon and nitrogen atoms because the oxygen atom has lone pair electrons instead of substituents. For the reverse thermal ring opening of oxaziridine to the nitrone, the two possible conrotatory motions of C-O bond cleavage should result in a mixture of the cis and trans-isomers of the nitrone, in contrast to the photoclosure which should be stereospecific.

Date: June 1, 1971

Creator: Splitter, Janet S.; Su, Tah-mun; Ono, Howard & Calvin, Melvin.

Object Type: Article

System: The UNT Digital Library

(open access)

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.

Object Type: Article

System: The UNT Digital Library

(open access)

THE EFFECT OF RIFAMPICIN, AND TWO DERIVATIVES, ON CELLS INFECTEDWITH MOLONEY SARCOMA VIRUS

It is shown that rifampicin, and especially its relative dimethyl-N-benzyl-N-desmethyl rifampicin, can inhibit focus formation by Moloney sarcoma virus on BALB/3T3 tissue cultures. At a dose level of 10 {micro}g/ml DMB appears to totally inhibit focus formation while reducing virus replication by at least a factor of fifty and cell proliferation by only a factor of three. These observations, taken together with those of others, suggest a role for the hybrid RNA-DNA dependent DNA polymerase and the gene for its synthesis both in normal cell processes and in the transformation process.

Date: March 1, 1971

Creator: Calvin, Melvin.; Joss, Urs R.; Hackett, Adeline J. & Owens, RobertB.

Object Type: Report

System: The UNT Digital Library