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  • 1
    Electronic Resource
    Electronic Resource
    Gel chromatographic procedure that corrects for Donnan effects in studies of ligand binding. Its application to the interaction of copper ions with bovine serum albumin and deoxyribonucleic acid (1974)
    s.l. : American Chemical Society
    Biochemistry 13 (1974), S. 1832-1836 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00706a010
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  • 2
    Electronic Resource
    Electronic Resource
    Platelet Membrane Glycoproteins: Functions in Cellular Interactions (1990)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 6 (1990), S. 329-357 
    Details
    ISSN: 0743-4634
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cb.06.110190.001553
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  • 3
    Electronic Resource
    Electronic Resource
    Ribonuclease and Chlorophyllase Activities in Senescing Leaves (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 22 (1969), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The activities of two enzymes, ribonuclease and chlorophyllase were investigated during the senescence of leaves. Ribonuclease activities were measured in primary leaves of Phaseolus vulgaris, and related to the levels of nucleic acid, protein and chlorophyll. Similarly, changes in chlorophyllase activity during senescence of leaves of Raphanus sativus were measured and related to chlorophyll. During senescence the levels of each enzyme as well as its respective substrate declined. Retardation of senescence, by excision of young tissue from intact plants or by treatment of detached leaves with cytokinins resulted in a maintainace of both the substrate and enzyme levels. It was concluded that high levels of ribonuclease and chlorophyllase activity are not linked directly with the degradation of RNA and chlorophyll during leaf senescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1969.tb07464.x
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  • 4
    Electronic Resource
    Electronic Resource
    Ribonuclease in Leaves of Phaseolus vulgaris during Maturation and Senescence (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 22 (1969), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The levels of the enzyme ribonuclease (RNase) were determined in primary leaves of Phaseolus vulgaris in an attempt to correlate changes in RNA with maturation and senescence. RNase, RNA and chlorophyll levels increased in expanding and maturing tissue and subsequently declined in senescing tissue. Senescence of the primary leaves started with the onset of flowering. A simultaneous increase of RNA and RNase in maturing tissue and a decrease during senescence suggests that the enzyme activity is correlated with the rate of‘turnover’of RNA rather than the absolute levels of RNA present in the tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1969.tb07434.x
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  • 5
    Electronic Resource
    Electronic Resource
    Another Source of Cellulase (1969)
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 986-987 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Truly cellulolytic micro-organisms are therefore believed to produce both Cj and Cx enzymes, while pseudo-cellulolytic micro-organisms elaborate only the Cx enzymes. Unfortunately, however, the problem has been further complicated in the past by the fact that while cellulolytic fungi were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/222986b0
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  • 6
    Electronic Resource
    Electronic Resource
    Recent developments in zinc oxide target chemistry (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 195 (1995), S. 271-277 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Zinc oxide targets irradiated with high energy protons at the Los Alamos Meson Physics Facility (LAMPF) contain a number of radioactive spallation products in quantities large enough to warrant recovery. This paper describes methods for recovering7Be,46Sc, and48V from such targets and offers suggestions on possible ways to recover additional isotopes. The proposed methods are based on traditional precipitation and ion exchange techniques, are readily adaptable to hot cell use, and produce no hazardous waste components. The products are obtained in moderate to high yields and have excellent radionuclidic purity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035966
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  • 7
    Electronic Resource
    Electronic Resource
    Activation rates and chemical recovery of67Cu produced with low energy proton irradiation of enriched70Zn targets (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 195 (1995), S. 263-270 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Copper-67 is a radioisotope with significant potential for diagnostic and therapeutic applications in nuclear medicine. Despite its promise,67Cu has failed to make an impact in clinical nuclear medicine, primarily because it is available sporadically, and in limited quantities. Common methods of production rely on high energy proton irradiation of natural zinc targets or on induced reactions using high energy neutrons at nuclear reactors. We have evaluated alternative production methods that could provide year-round adequate supply of this isotope. Using a low energy accelerator, we have studied the production of67Cu by proton reactions on enriched70Zn. Our results indicate that it is possible to produce useful quantities of67Cu from the irradiation of enriched70Zn with protons that have energies of less than 20 MeV. Production rates are higher than currently used methods at high energy accelerators or reactors. This isotope can be made available throughout the year as a result of this research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035965
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  • 8
    Electronic Resource
    Electronic Resource
    Application of sephadex to radiochemical separations (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 195 (1995), S. 251-261 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Heteropolymolybdic acid species of a variety of elements bind to Sephadex (dextran cross-linked by epichlorohydrin). Solution pH can be used as a variable to influence the formation of heteropolymolybdates and thus their affinity for Sephadex. Therefore this material may be used to chromatographically separate certain elements which have been reacted with molybdate in solution. In this paper we report the measurement of distribution coefficients on Sephadex for heteropolymolybdates of As, P, Ge, Si, and Se for solutions of varying pH. We also describe the application of the technique to the recovery of32Si from proton-irradiated KCl targets and68Ge from proton-irradiated molybdenum targets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035964
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  • 9
    Electronic Resource
    Electronic Resource
    Waste minimization in the Los Alamos Medical Radioisotope Program (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 195 (1995), S. 287-295 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Since the mid-1970s the Los Alamos Medical Radioisotope Program has been irradiating target materials to produce and recover radioisotopes for applications in medicine, environmental science, biology, physics, materials research, and other disciplines where radiotracers find utility. By necessity, the chemical processing of targets and the isolation of radioisotopes generates radioactive waste materials. In recent years there have been federal mandates requiring us to discontinue the use of hazardous materials and to minimize radioactive waste volumes. As a result, substantial waste reduction measures have been introduced at the irradiation facility, in processing approaches, and even in the ways the product isotopes are supplied to users.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035968
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  • 10
    Electronic Resource
    Electronic Resource
    Recovery of hafnium radioisotopes from a proton irradiated tantalum target (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 236 (1998), S. 155-157 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The178m2Hf nucleus, with its long half-life (31 y) and high-spin isomeric state (16+) is desired for new and exotic nuclear physics studies. The Los Alamos Radioisotope Program irradiated a kilogram of natural tantalum at the Los Alamos Meson Physics Facility in early 1981. After fifteen years of decay, this target was ideal for the recovery of178m2Hf. There was more than a millicurie of178m2Hf produced during this irradiation and there has been a sufficient period of time for most of the other hafnium radioisotopes to decayed away. Traditionally, separation techniques for recovering hafnium isotopes from tantalum targets employ solvent extractions with reagents that are considered hazardous. These techniques are no longer condoned because they generate a mixed-waste (radioactive and hazardous components) that can not be treated for disposal. In this paper we describe a new and unique procedure for the recovery of hafnium radioisotopes from a highly radioactive, proton irradiated, tantalum target using reagents that do not contribute a hazardous waste component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386334
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