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  • 11
    Electronic Resource
    Electronic Resource
    Calcium Metabolism and Nutrition Problems (1943)
    [s.l.] : Nature Publishing Group
    Nature 151 (1943), S. 379-381 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Normal Calcium Metabolism THE skeleton is the sole calcium store in the body1. The calcium in the cortex of the bones is relatively stable, only being drawn upon in severe calcium deficiency; the calcium in the bony trabeculse is, however, continuously taking part in the calcium exchanges of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/151379a0
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  • 12
    Electronic Resource
    Electronic Resource
    Tube Formation in Pomatoceros triqueter (L.) (1938)
    [s.l.] : Nature Publishing Group
    Nature 141 (1938), S. 648-649 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AMONG the scientific effects of the late Frank A. Potts was found the following account of tube formation in the serpulid worm Pomatoceros triqueter, a subject on which he had been working intermittently for some time. The apparently homogeneous keeled tube is seet) in longitudinal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/141648b0
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  • 13
    Electronic Resource
    Electronic Resource
    Evaluation of copper Chemical-Vapor-Deposition films on glass and Si(100) substrates (1994)
    Springer
    Applied physics 58 (1994), S. 607-613 
    Details
    ISSN: 1432-0630
    Keywords: 81.15 ; 68.55 ; 07.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thin films of pure copper have been deposited on glass and Si(100) substrates using copper acetylacetonate [Cu(acac)2] and copper HexaFluoroAcetylacetonate [Cu(HFA)2] sources. A thermal, cold-wall, reduced pressure (3325–5985 Pa) Metal-Organic Chemical Vapor Deposition (MOCVD) process was employed. The effect of H2O vapor on the grain size, deposition rate, and resistivity was examined. Electrical resistivities of 2.4 μω cm for copper films deposited on Si(100) and 3.44 μω cm for copper films deposited on glass at substrate temperatures of 265° C and a [Cu(acac)2] source temperature of 147° C with the use of H2O vapor were measured. When [Cu(HFA)2] was used, the substrate temperature was 385° C and the source temperature was 85° C. An activation energy for the copper film deposition process was calculated to be 22.2 kJ/mol in the case of the [Cu(acac)2] source. A deposition rate of 11 nm/min was obtained with Cu(acac)2 as the source and the rate was 44.4 nm/min with the Cu(HFA)2 source; both were obtained with the use of H2O vapor. No selectivity was observed with either source for either substrate. The deposited films were fully characterized using XRD, LVSEM, SAXPS, and RBS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348173
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  • 14
    Electronic Resource
    Electronic Resource
    The beta decay of139I (1985)
    Springer
    The European physical journal 321 (1985), S. 705-706 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A preliminary investigation of the decay of139I was made at the TRISTAN on-line mass separation facility using a negative-surface ionization source. Over 100 new γ rays are assigned to the decay of139I. The level scheme for the low-lying structure of139Xe supports a g.s. spin of 3/2−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432453
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  • 15
    Electronic Resource
    Electronic Resource
    Determination of major and trace elements in bones by simultaneous PIXE/PIGE analysis (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 169 (1993), S. 259-267 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Simultaneous PIXE/PIGE was used to determine the concentration of 20 elements including N, O, F, Na, Mg, P, Ca (PIGE) and Cr, Mn, Cu, Zn, Cd, Ba, Pb (PIXE) in a number of animal and human rib samples, marrow, and the IAEA CRM Animal Bone (H-5). Samples and standards were bombarded with 2.5 and 4.0 MeV external proton beams. The minimum detection limits for most of the minor and trace elements ranged from 0.5 to 1.5 ppm. The sample preparation procedure for the nondestructive instrumental analysis of bone is discussed in detail. The analysis method is fast, nondestructive and offers selective analysis of the cortical and cancellous surface of the same bone sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02046801
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  • 16
    Electronic Resource
    Electronic Resource
    A radiochemical neutron activation analysis method for the determination of total mercury in coal (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 235 (1998), S. 255-259 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A radiochemical neutron activation analysis method has been developed based on pyrolysis followed by double gold amalgamation for the determination of mercury in solid samples. Accurate results were obtained for mercury in six standard reference materials of varying matrices, including coal. Linearity was demonstrated up to mercury concentrations of 10,000 ng/g. The method is capable of yielding precise, reproducible values with a detection limit of 5 ng/g for mercury in coal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385971
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  • 17
    Electronic Resource
    Electronic Resource
    Out of the textbook and into the world: Student projects in the radiochemistry laboratory (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 171 (1993), S. 213-218 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A major objective of any laboratory course should be to stimulate students to extend their knowledge of the subject to specific problems. In the radiochemistry laboratory course at the University of Kentucky, we encourage students to make the transition from the textbook or laboratory manual to the “real” world through the use of a special project. This project, which typically replaces two normal laboratory exercises, is a short research problem that the student independently develops and executes. An overview of the incorporation of special projects into our radiochemistry laboratory course is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039689
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  • 18
    Electronic Resource
    Electronic Resource
    Comparison of laser microprobe mass spectrometry (LMMS) and micro particle induced X-ray emission (micro-PIXE) for the analysis of senile plaques in Alzheimer's disease: A preliminary study (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 195 (1995), S. 7-12 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Results of micro-PIXE analysis of senile plaques (SP) in Alzheimer's disease (AD) brain have been utilized to independently confirm levels of iron (Fe) as measured by LMMS in adjacent brain sections. LMMS concentrations were calculated based on the preparation and analysis of an iron calibration curve prepared in our laboratory. The LMMS standards consist of ironcis-dicyclohexano-18-crown-6 ether coordination complexes dissolved in Spurr's low viscosity embedding medium. To our knowledge, this is the first report of the use of micro-PIXE, with its spatial resolution and detection limits comparable to that of LMMS, in the validation of LMMS results. The agreement observed between results obtained for Fe by micro-PIXE and LMMS indicates that the use of our LMMS standards, at least in the case of Fe, yields accurate results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036467
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  • 19
    Electronic Resource
    Electronic Resource
    Lead determinations in human bone by particle induced X-ray emission (PIXE) and graphite furnace atomic absorption spectrometry (GFAAS) (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 195 (1995), S. 83-89 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Chronic lead (Pb) intoxication has been linked to Alzheimer's disease (AD). Lead, like many heavy elements, tends to accumulate in bone. PIXE is a powerful analytical tool which permits the determination of Pb at the μg/g level without requiring sample digestion. GFAAS is one of the most sensitive methods for the determination of Pb and is capable of determining ng/g levels in solution. For bone analyses by GFAAS, sample dissolution and a matrix modifier are required. Rib bone samples were analyzed for Pb by PIXE and GFAAS. IAEA Animal Bone (H-5) was used as a secondary standard for Pb with both methods to ensure accuracy. The range of Pb concentrations in human rib bone was 1.4–11.5 μg/g for the trabecular surface by PIXE, 1.3–45 μg/g for the cortical surface by PIXE, and 1.54–11.75 μg/g for whole bone by GFAAS. No significant difference (p〉0.05) was found for AD versus control for either surface or for whole bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036476
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  • 20
    Electronic Resource
    Electronic Resource
    PIXE analysis of the hydrothermal leaching of trace elements in coal (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 221 (1997), S. 23-28 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The minor and trace element content in coal is of great interest due to the potential impact on the environment from the release of these elements during combustion. Reducing the concentrations of potentially hazardous elements in coal prior to combustion is one way of dealing with this issue. In this research particle induced X-ray emission (PIXE) was used to investigate a hydrothermal leaching process for the removal of trace elements from a bituminous coal. The leaching agents HNO3 and NaOH were evaluated along with the effects of process parameters (temperature, pressure, and time) on the method's effectiveness. The variable with the greatest influence was the leaching agent itself. HNO3 was determined to be more effective than NaOH in reducing elemental concentrations for nearly all the elements determined. Increasing the temperature did result in greater reductions for some elements (Cl, Br, Zn) whereas increasing the pressure and duration of the leaching process had minimal impact on reductions, in elemental concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035237
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