23 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Organic Acids"  
Results: 1 - 23
open access

Short-lived positron emitter labeled radiotracers - present status

Description: The preparation of labelled compounds is important for the application of positron emission transaxial tomography (PETT) in biomedical sciences. This paper describes problems and progress in the synthesis of short-lived positron emitter (/sup 11/C, /sup 18/F, /sup 13/N) labelled tracers for PETT. Synthesis of labelled sugars, amino acids, and neurotransmitter receptors (pimozide and spiroperidol tagged with /sup 11/C) is discussed in particular. (DLC)
Date: January 1, 1982
Creator: Fowler, J. S. & Wolf, A. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radionuclide distributions and migration mechanisms at shallow land burial sites. Annual report of research investigations on the distribution, migration and containment of radionuclides at Maxey Flats, Kentucky. [Maxey Flats]

Description: Subsurface waters at Maxey Flats are anoxic systems with high alkalinity and high concentrations of dissolved ferrous ion. Americium and cobalt in these trench waters are made more soluble by the presence of EDTA, while strontium and cesium are unaffected under the same conditions. EDTA is the major organic complexing component in waste trench 27 leachate, but other polar, water-soluble organics are also present. Evidence points to the migration of plutonium between waste trench 27 and inert at… more
Date: July 1, 1982
Creator: Kirby, L. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Influence of humic-acid complexing on the mobility of Americium in the soil aquatic environment

Description: Diffusion data indicate the Am, Cm and Np migrate 1.2, 0.8, and 26 centimeters, respectively, in a thousand years. Thus, excluding mass transport by moving water or wind, actinide elements, such as Cm, Am, and Np that find their way to the soil-aquatic environment are relatively immobile. Measured diffusion coefficients, corrected for distribution between the aqueous and soil phases, tortuosity, negative absorption, and relative fluidity are in reasonable agreement with aqueous diffusion coeffi… more
Date: March 1, 1982
Creator: Sheppard, J.C.; Campbell, M.J. & Kittrick, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrochemistry applied to biomass. Progress report, October 1980-September 1981

Description: The electrochemical conversion of biomass-derived compounds, obtained through thermochemical pretreatments, into valuable organic chemicals, petrochemical substitutes, and energy-intensive chemicals is investigated. A hardwood-derived lignin obtained from ethanol extraction of the explosively depressurized aspen has been investigated. We have partially characterized this lignin material, and have also submitted it to electrolyses under controlled potential. The electrolytic conditions employed … more
Date: April 1, 1982
Creator: Chum, H. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Separation of Am-Cm from Al(NO/sub 3/)/sub 3/ waste solutions by in-canyon-tank precipitation as oxalates

Description: A process for recovery of Am-Cm residues from high-activity waste concentrates has been developed specifically for application in Savannah River Plant (SRP) canyon tanks. The Am-Cm residues were collected from a campaign to produce plutonium containing high isotopic concentrations of /sup 242/Pu. The separation of Am-Cm from the high-activity waste stream, containing about 2M Al(NO/sub 3/)/sub 3/, is necessary to produce an acceptable feed solution for a later pressurized cation exchange chroma… more
Date: April 1, 1982
Creator: Gray, L. W.; Burney, G. A.; Wilson, T. W.; McKibben, J. M.; Bibler, N. E.; Holtzscheiter, E. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Membrane-controlled processes for the energy-efficient conversion of sludges to fuels and marketable chemicals

Description: Studies were carried out on the concentration of primary and secondary sludges by ultrafiltration, and the operation of a membrane-assisted anaerobic digester to treat these sludges. Auxiliary devices including water-spilling and membrane solvent extraction were tested for their feasibility in the ehhancement of digester operations and the recovery of valuable byproducts. It was shown that membrane-facilitated digestion can increase the rate of these processes by a factor of ten, together with … more
Date: March 1, 1982
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Diffuse reflectance infrared Fourier-Transform spectra of selected organic compounds

Description: Diffuse reflectance infrared spectra of a variety of different organic compounds have been determined. Profiles of the spectra along with the location and relative intensity of the principal bands have been included for each compound studied. In addition both diffuse reflectance and transmittance infrared spectra were obtained for the same samples, and the spectral results were compared. Although some minor variations are observed between a diffuse reflectance spectrum and the corresponding tra… more
Date: May 1, 1982
Creator: Harmon, S.H. & Caton, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dosimetric implications of new compounds for neutron capture therapy (NCT)

Description: Systemic application of radiolabeled or cytotoxic agents should allow targeting of primary and metastatic neoplasms on a cellular level. In fact, drug uptake in non-target cell pools often exceeds toxic levels before sufficient amounts are delivered to tumor. In addition, at the large concentration of molecules necessary for therapy, effects of saturation are often found. Application of NCT can circumvent problems associated with high uptake in competing non-target cell pools, as the /sup 10/B(… more
Date: January 1, 1982
Creator: Fairchild, R.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of organic complexants on the mobility of low-level-waste radionuclides in soils

Description: The effect of certain organic complexants on the distribution of some radionuclides between solution and soil has been measured. The complexants and radionuclides examined are some of those most likely to be present in low-level waste disposal sites; Cs, Sr, Ni, Co, and Eu radionuclides, and EDTA, DTPA, oxalate, and citrate complexants. The effect of complexants was found to vary widely; in some systems there was no effect and in other systems there were large effects. In some cases slow rates … more
Date: February 1, 1982
Creator: Swanson, J.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pilot scale, alpha disassembly and decontamination facility at the Savannah River Laboratory

Description: An alpha-contained pilot facility is being built at the Savannah River Laboratory (SRL) for research into the disassembly and dcontamination of noncombustible, Transuranic (TRU) waste. The design and program objectives for the facility are presented along with the initial test results from laboratory scale decontamination experiments with Pu-238 and Cm-244.
Date: January 1, 1982
Creator: Cadieux, J. R.; Becker, G. W., Jr.; Richardson, G. W. & Coogler, A. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New compounds for neutron capture therapy (NCT) and their significance

Description: Clearly the most effective tumor therapy would be obtained by the selective targeting of cytotoxic agents to tumor cells. Although many biomolecules are known to be taken up in tumors, the targeting of cytotoxic agents to tumors is limited by the fact that other essential cell pools compete with equal or even greater effectiveness. The approach of delivering stable non-toxic isotopes to tumor, with activation by means of an external radiation beam, is advantageous for two reasons: (1) it obviat… more
Date: January 1, 1982
Creator: Fairchild, R.G. & Bond, V.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Problems and prospects in future applications of stable isotopes in the life sciences and medicine

Description: In the last decade, there has been a resurgence of interest in the use of stable isotopes of carbon, oxygen, and nitrogen in the life sciences and medicine fueled by the increased availability of the isotopes and isotopically labeled compounds and of instruments for their detection. Accelerated development of /sup 13/C, /sup 15/N, and /sup 17/ /sup 18/O can be expected in the future for studies of drug bioavailability, nutrition and body protein economy, viability of organs for transplant, and … more
Date: January 1, 1982
Creator: Matwiyoff, N. A.; Unkefer, C. J. & Walker, T. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Behavior of reduced 99/Tc and 99/Tc organic complexes on Hanford soil

Description: Both synthetically and naturally derived organic complexing agents in soil have been found in other studies to accelerate the rate of migration of specific radionuclides. In an effort to aid in the development of comprehensive plans for the disposal of low-level waste, the effect of organic complexing agents on the transport properties of /sup 99/Tc, a long-lived constituent of radioactive waste, was examined. The effect of ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic a… more
Date: February 1, 1982
Creator: Franz, J. A.; Martin, L. Y. & Wiggins, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Isolating /sup 241/Am from waste solutions containing Al, Ca, Fe, and Cr

Description: About 2.4 kg of /sup 241/Am contaminated with calcium and aluminum had been recovered from low-activity waste during recycle of 11% /sup 240/Pu. A process was developed and demonstrated to purify the americium before shipment as /sup 241/AmO/sub 2/. The americium and some of the calcium were batch extracted into 50% TBP-n-paraffin from 2.2M Al(NO/sub 3/)/sub 3/ - 0.3M HNO/sub 3/ solution in a canyon tank. Pregnant solvent was scrubbed first with 2.1M Al/sup 3 +/-0.3M Li/sup +/-6.7M NO/sub 3/- a… more
Date: January 1, 1982
Creator: Gray, L. W.; Burney, G. A. & King, C. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Irradiation effects in the storage and disposal of radioactive ion-exchange resins

Description: Research is under way to characterize the effects of self-irradiation on radwastes which may be generated when organic ion-exchange media are used in water demineralization or decontamination operations at nuclear facilities. External factors affecting the relation between laboratory evaluations and field performance are emphasized. Initial experiments do not yet indicate substantial radiation dose-rate effects on radiolytic gas yields or acid product formation, when (fully swollen) sulfonic ac… more
Date: January 1, 1982
Creator: Swyler, K. J.; Dodge, C. E.; Dayal, R. & Weiss, A. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Acidification of geothermal wells: Laboratory experiments. Geothermal Reservoir Well-Stimulation program

Description: The laboratory testing of the reactions of acetic, formic, hydrochloric, and hydrofluoric acids with calcium carbonate, kaolin, sepiolite, and two formation materials at geothermal temperatures is described. A workable test procedure was developed which provided information regarding the relative reactivities of selected minerals or formation materials with three of the four acids investigated. Tests with hydrochloric acid were complicated by reactions of the acid with the test vessel materials… more
Date: January 1, 1982
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Redox reactions involving chromium, plutonium, and manganese in soils. Final report, 1 July 1978-30 September 1981

Description: Although particulate movement through wind and water erosion is the most important mechanism of dispersion of Pu at the Nevada Test Site, dispersion of water-soluble species may also be occurring. However, because Pu is toxic, usually insoluble, not uniformly distributed in the soil, and can exist in four oxidation states in the environment, it is very difficult to study. Therefore, Cr reactions in soil were investigated as a possible general model for Pu reactions in soil, since it was postula… more
Date: June 1, 1982
Creator: Amacher, M C & Baker, D E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Genetic recombination in mammalian cells in culture. Progress report, August 1, 1981-July 31, 1982

Description: A glycine requiring hybrid, synthesized from two independent glycine requiring non-complementary mutants, was examined for its ability to produce glycine independent progeny spontaneously. The hybrid produced glycine independent progeny at a rate two orders of magnitude above the spontaneous mutation rate of either parent culture. Karyotype analysis of the progeny indicated a high incidence of rearrangement in one chromosome accompanying the change to glycine independence. These observations ar… more
Date: September 1982
Creator: Morse, M. Laurance
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of organic complexants on the mobility of nickel and cobalt in soils. Status report

Description: A study is being conducted of the effect of organic complexing agents on the behavior of low-level waste radionuclides in soil/groundwater systems. This report contains the results of recent work with Ni and Co, two elements that have radioactive isotopes that are important to low-level waste disposal. The complexants studied were EDTA, DTPA, oxalate, and citrate. Data were obtained from experiments using soils from both an arid site (Hanford, Washington) and a humid site (Savannah River, South… more
Date: September 1, 1982
Creator: Swanson, J.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Interactive radiopharmaceutical facility between Yale Medical Center and Brookhaven National Laboratory. Progress report, June 1981-July 1982

Description: Progress is reported in the following research areas: (1) evaluation of /sup 14/C-labelled carboxyethyl ester 2-cardoxy methyl ester of arachidonic acid; (2) the effects of drug intervention on cardiac inflammatory response following experimental myocardial infarction using indium-111 labeled autologous leukoyctes; (3) the evaluation of /sup 97/Ru-oxine to label human platelets in autologous plasma; and (4) the specific in vitro radiolabeling of human neutrophils. (ACR)
Date: January 1, 1982
Creator: Gottschalk, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structure of bound water and refinement of acid metmyoglobin

Description: The structure of myoglobin has been determined by x-ray diffraction for the acidmet, deoxy, and the oxy forms. Neutron diffraction work, done in this laboratory, has demonstrated that hydrogen and deuterium positions can be located. In addition to the localization of H and D, neutron diffraction provides a unique method for studying the water structure because of the strong scattering ability of D/sub 2/O. The scattering factor of deuterium is nearly twice as large as that of hydrogen, and it i… more
Date: June 1, 1982
Creator: Raghaven, N. V. & Schoenborn, B. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Novel 7-substituted coumarin compounds and an improved method for their synthesis. [Patent application]

Description: Novel substituted coumarin compounds and an improved method for their synthesis are disclosed. The preferred class of compounds are substituted at the 7-position. The method of synthesis comprises reacting a polyhydroxy benzene or a substituted phenol, with a ..beta..-alkoxy acrylic acid or nitrile, in the presence of a Lewis acid catalyst. By the inclusion of the catalyst in the reaction mixture, the reaction can be carried out under much milder experimental conditions and in increased yields.… more
Date: January 20, 1982
Creator: Bissell, Eugene R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Separation of rubidium from irradiated aluminum-encapsulated uranium

Description: A procedure was developed for separating rubidium from irradiated aluminum encapsulated uranium. The separations procedure produces a final ultra-high purity RbCl product for subsequent high performance mass spectrometric analysis. The procedure involves first removing most of the macro-components and fission products by strong base anion exchange using, first, concentrated HCl, then oxalic acid media and second, selectively separating rubidium from alkaline-earth ions and other alkali-metal io… more
Date: January 1, 1982
Creator: Horwitz, E. P.; Schmitz, F. J. & Rokop, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen