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  • 1
    Electronic Resource
    Electronic Resource
    Alpha Activity of Certain Botanical Materials (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 208-211 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE data presented in this article result from continuation of a series of investigations aimed at defining the nature and present levels of naturally occurring radioactivity in man and his environment 1~5. Previously we have been concerned with the direct intake of natural radioactivity by man, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/187208a0
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  • 2
    Electronic Resource
    Electronic Resource
    X-Ray Diffraction Pattern of Ammonium Fluoferrate (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 749-749 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] X-Ray diffraction patterns of ammonium fluoferrate. (a) Powder camera, (b) Spectrometer A sample of ammonium fluoferrate was prepared and its composition verified by chemical analysis. X-ray diffraction patterns were obtained using both powder camera and spectrometer. A Philips Norelco X-ray ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169749a0
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  • 3
    Electronic Resource
    Electronic Resource
    A Method of Making Visible the Distribution of Activity in a Source of Ionizing Radiation (1951)
    [s.l.] : Nature Publishing Group
    Nature 168 (1951), S. 762-765 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FROM the medical point of view, probably the most important physical question in relation to the use of radioactive isotopes is finding their distribution in the bodys If we are interested in diagnostic applications, then clearly this is the main problem which faces us. What we want to know is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/168762a0
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  • 4
    Electronic Resource
    Electronic Resource
    Alpha-Ray Activities of Humans and their Environment (1958)
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 518-521 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE radioactivity of the human body and its environment has become a matter of increasing importance and concern particularly in view of the hazards now known to be associated with the ingesti n or inhalation of small quantities of radioactivity. It is well known that the human body normally ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/181518a0
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  • 5
    Electronic Resource
    Electronic Resource
    Naturally Occurring Alpha-Activity of Drinking Waters (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 348-352 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE present article represents a continuation of investigations into the nature and levels of naturally occurring a-activity in man and his environment. We have demonstrated the great variations of a-activity to be found as between different human foods1. Following the observations on foods it was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189348a0
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  • 6
    Electronic Resource
    Electronic Resource
    Radon Content of the Atmosphere (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 203-204 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The radium contents of the coals are in a narrow range of values and are similar to those described in the preliminary work. The absence of levels of a higher order suggests that the contribution of radon from this source does not represent a significant addition to the total atmospheric level. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/178203a0
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  • 7
    Electronic Resource
    Electronic Resource
    The Radon Content of the Atmosphere (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 424-426 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MEASUREMENTS of the radon content of the atmosphere were made so long ago as 1905 by Eve1-2 in Montreal, in 1908 by Satterley3 in Cambridge and Ashman4 in Chicago. The values obtained by these workers ranged from 2-0 x 10-14 to 2-0 x 10~13 curie per litre, and the results as a whole seemed to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174424a0
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  • 8
    Electronic Resource
    Electronic Resource
    Multipoint linkage analysis of the short arm of chromosome 11 in non-insulin dependent diabetes including maturity onset diabetes of youth (1992)
    Springer
    Human genetics 〈Berlin〉 89 (1992), S. 207-212 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Members of three families with maturity onset diabetes of youth (MODY) and seven with “common” type 2 diabetes were typed for six DNA markers (H-RAS, INS, HBBC, PTH, CALC1, CAT) on the short arm of chromosome 11. Using conventional pairwise linkage analysis, close linkage in the MODY families was excluded for all six markers. By multipoint analysis and a genetic map of the short arm of chromosome 11, MODY was excluded from a region of at least 35 and up to 60 centiMorgans (cM) on the short arm of chromosome 11. Multipoint analysis in the type 2 families also excludes linkage to the INS, H-RAS region of at least 3 and up to 30 cM. This study using multipoint linkage analysis in non-insulin dependent diabetes provides strong evidence against a role for mutations in or around the insulin gene in the causation of MODY or type 2 diabetes in the families studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217125
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular and macroscopic properties of PMMA bone cement: Free-radical generation and temperature change versus mixing ratio (1981)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 15 (1981), S. 425-432 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The molecular and macroscopic changes occurring during the polymerization of poly(methyl methacrylate) (PMMA) bone cement have been investigated. Electron paramagnetic resonance (EPR) spectroscopy was used to monitor free-radical generation and this was compared to temperature changes occurring in the cement for various ratios of polymer powder to liquid monomer (P/L ratio) used in the sample preparation. Both the concentration and the characteristic growth time of the free radicals associated with the polymerization of the bone cement depended on the P/L ratio used. Larger P/L ratio resulted in shorter characteristic growth time for the free radicals as well as a shorter time for the occurrence of the peak sample temperature. Smaller P/L ratios gave smaller maximum concentrations of free radicals and larger peak temperatures. These results are explained on the basis of (1) more initiators present at higher P/L ratios resulting in faster polymerization and (2) less initiators and more monomers present at smaller P/L ratios resulting in fewer radicals but more exothermic reactions. The free radicals present in the bone cement due to the manufacturer's sterilization process were found to be proportional to the fraction of powder used in the preparation, indicating negligible monomer loss during sample mixing.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820150312
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of initial temperature on free radical decay in PMMA bone cement (1982)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 16 (1982), S. 639-646 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The effect of varying the initial temperature of the components of poly(methyl methacrylate) (PMMA) bone cement has been investigated. Electron paramagnetic resonance (EPR) spectroscopy was used to monitor free radical decay during the curing of the cement. Samples cured in saline at 37°C were found to exhibit first-order decay kinetics for the polymerization radicals for approximately one week after mixing. This indicates that the decay did not take place by combination or disproportionation and was probably due to a transfer process. Decreasing the temperature of the bone cement components prior to mixing resulted in smaller decay rates, but still with first-order kinetics. This decrease in decay rate with lower initial temperature may be due to decreased porosity of the cement, possibly due to decreased monomer evaporation. SEM micrographs of the samples were consistent with this change in porosity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820160511
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