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  • 1
    Electronic Resource
    Electronic Resource
    Selenium and myocardial infarction: Glutathione peroxidase in platelets (1981)
    Springer
    Journal of molecular medicine 59 (1981), S. 817-818 
    Details
    ISSN: 1432-1440
    Keywords: Selenium ; Glutathione peroxidase ; Platelets Thrombosis ; Myocardial infarction ; Selen ; Glutathionperoxidase ; Thrombozyten ; Thrombose ; Herzinfarkt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Aktivität des Selenenzyms Glutathionperoxidase (EC 1.11.1.9) wurde in den Blutplättchen von 15 Patienten mit frischem Herzinfarkt und 13 Kontrollpersonen gemessen. Die Blutplättchen der Patienten zeigten signifikant niedrigere Enzymaktivitäten (P(t)〉0.99). Möglicherweise steht dies mit der Erkrankung in pathogenetischem Zusammenhang.
    Notes: Summary The activity of the selenoenzyme glutathione peroxidase (EC 1.11.1.9) was determined in platelets of 15 patients with acute myocardial infarction and 13 control subjects. The platelets of the patients had significantly lower activities of the enzyme (P(t)〉0.99). This may be related to the pathogenesis of the disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01724689
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  • 2
    Electronic Resource
    Electronic Resource
    Recent SRMs for organic and inorganic nutrients in food matrices (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 456-458 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The National Institute of Standards and Technology (NIST) has recently introduced several reference materials for organic and inorganic nutrients in food matrices to assist the food industry in complying with nutrition labeling laws; the food industry and other government agencies have collaborated with NIST in this endeavor. Two food-matrix SRMs were issued in 1996: SRM 1544, Fatty Acids and Cholesterol in Frozen Food Composite; and SRM 1846, Infant Formula. Concentration values in SRM 1544 are provided for six fatty acids, cholesterol, and proximates (fat, protein, carbohydrate, etc.). Values are assigned for proximate and caloric content as well as the concentrations of sixteen vitamins and nine minerals and trace elements in SRM 1846. In 1997, NIST expects to issue two additional food-matrix SRMs: SRM 1548a, Typical Diet, and SRM 2383, Baby Food Composite. SRM 1548a will replace SRM 1548, Total Diet, and will have values assigned for proximates, major and minor inorganic nutrients, and toxic trace elements. SRM 2383 will have values assigned for proximates, vitamins, carotenoids, and inorganic nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050738
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  • 3
    Electronic Resource
    Electronic Resource
    The search for organic nutrient standards (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 326 (1987), S. 696-698 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The search for organic nutrient standards is approached from two sides. On the one hand, useful standards are selected from currently available SRMs; on the other hand, a representative food is developed representing the daily intake of a typical consumer. It is a composite of 201 foods, collected and prepared in a table-ready fashion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00473532
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  • 4
    Electronic Resource
    Electronic Resource
    Results of a co-ordinated research programme to improve the certification of IAEA milk powder A-11 and animal muscle H-4 for eleven “difficult” trace elements (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 326 (1987), S. 723-729 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In the original intercomparisons two of the IAEA's reference materials, milk powder A-11 and animal muscle H-4, gave unsatisfactory results, with a wide spread of values for many trace elements of interest, and subsequently the recommended values for Cu and Mn in A-11 have been questioned. In the present work, efforts to improve the status of these two materials through a co-ordinated research programme involving a small group of experienced laboratories is described. The elements chosen were As, Cd, Co, Cr, Cu, Hg, I, Mn, Mo, Ni and Pb, and the techniques used were neutron activation analysis (NAA), atomic absorption spectroscopy (AAS) in various modes, inductively coupled plasma emission spectroscopy (ICP), electrochemical methods, and also for iodine, a catalytic method. The results show a satisfactory measure of concordance for most of the elements (in marked contrast to the original results), and allow proposals to be made for revision of the recommended values. Only in the case of Ni and Pb (where NAA data are not available) is the position not fully resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00473540
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  • 5
    Electronic Resource
    Electronic Resource
    The use of neutron activation in dietary reference material analysis (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 657-661 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Results for a number of trace elements in a total human diet material (USDIET-1), obtained by the application of both INAA and RNAA are presented. Several dietary reference materials such as NBS SRM 1577A, and BCR CRM Single Cell Protein were also analyzed, and these results are also given. Combining measurements on short and long lived radionuclides, the INAA approach is useful for the determination of about 20 elements. In order to expand the elemental coverage or improve detection limits, RNAA was also explored in two modes: separation of radionuclides using organic ion exchange resins and the use of hydrated manganese dioxide. This combination is applicable to 15 trace elements. For example, using RNAA, the following results were obtained for USDIET-1: Cd=31.8, Mo=280, Cr=71, Ag=4, As=117 and Sb=9.4 μg/kg. In the INAA mode, special attention was given to Al, F and Se. The F content of USDIET-1 was found to be 840 mg/kg, a rather high value, resulting from handling USDIET-1 by Teflon tools. By applying INAA and RNAA under two different laboratory conditions, it has been demonstrated that, even for the so-called difficult to determine elements like Cr, As or Mo, consistent results can be obtained. Thus, NAA promises to be a strong tool for human nutritional studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00472663
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of boron and lithium in diverse biological matrices using neutron activation-mass spectrometry (NA-MS) (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 562-566 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Essential features of the neutron activation-mass Spectrometry (NA-MS) technique are described. Applicability of this technique for the simultaneous determination of boron and lithium is demonstrated for a diverse group of biomaterials. NA-MS is a nondestructive analytical technique, and dynamic in nature since its coverage extends to a broad range of concentration levels. Contamination after the irradiation step, extraneous by natural lithium or boron is inconsequential, since only the activation products are the analyted assayed. Coupling the nuclear activation phenomenon which generates 4He and 3He (from 10B and 6Li, respectively), with the high precision potential of mass spectrometry forms the bases of this technique. Under ideal conditions the detection limit is extendable to pg g−1 concentration ranges and therefore, it is extremely well suited to investigate the natural concentration levels of boron and lithium in biomaterials. The potential of this method for the determination of lithium in biomedical trace element research is of special significance since determination of sub-ppb levels of lithium by other analytical techniques faces serious analytical difficulties mainly due to contamination control and in some cases to insufficiently low detection limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322539
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  • 7
    Electronic Resource
    Electronic Resource
    Radiochemical separations for inorganic trace elements in some biological reference materials, foods, tissues and body-fluids (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 110 (1987), S. 503-517 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A simple radiochemical machine incorporating ion-exchange procedures has been described. The system has been tested repeatedly for the determination of Cd, Co, Cr, Cu, Mn and Mo at ultra trace concentration levels in a variety of biological samples such as reference materials, human blood serum, human milk, hair and certain dietary materials, thereby demonstrating its suitability for practical use. The procedure can also yield results for A, Au and W, without any further chemical manipulations. Results show 〈1, 0.12, 0.18, 983, 0.61 and 0.91 μg/l for Cd, Co, Cr, Cu, Mn and Mo, respectively, in human blood serum. Corresponding concentrations in human milk are 〈1, 0.25, 〈1, 186 to 310, 4 to 40 and 5.8 μg/l. Among the reference materials, IAEA milk standard A-11 shows 1.85, 5.1, 17, 380, 260 and 101 ng/g for Cd, Co, Cr, Cu, Mn and Mo, respectively. Corresponding concentrations in animal muscle H-4 are 4.1, 5, 10.2, 4000, 455 and 45 ng/g. Importantly, this scheme has been applied to process large number of samples from single investigations such as those arising from dietary studies, obtaining quick and reliable data for routine use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035540
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  • 8
    Electronic Resource
    Electronic Resource
    Sample validity in biological trace element and organic nutrient research studies (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 112 (1987), S. 151-160 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The complexities involved in dealing with the requirements of trace element research studies in the life sciences demand comprehensive planning of the investigations and use of a variety of techniques. It also requires a combination of biological insight and analytical awareness on the part of the investigators in order to obtain valid samples for analysis. Thus, the generation of meaningful conclusions from elemental composition studies on biological systems is a strictly multidisciplinary task, an approach that is vital for the overall success of the investigations. In addition, new initiatives are needed to produce multipurpose biological reference materials to cope with the growing demands of this multifaceted area of research. These aspects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037286
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  • 9
    Electronic Resource
    Electronic Resource
    Analytical Quality Assurance Procedures Developed for the IAEA's Reference Asian Man Project (Phase 2) (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 245 (2000), S. 123-126 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Analytical quality assurance procedures adopted for use in the IAEA Co-ordinated Research Project on Ingestion and Organ Content of Trace Elements of Importance in Radiological Protection are designed to ensure comparability of the analytical results for Cs, I, Sr, Th, U and other elements in human tissues and diets collected and analysed in nine participating countries. The main analytical techniques are NAA and ICP-MS. For sample preparation, all participants are using identical food blenders which have been centrally supplied after testing for contamination. For quality control of the analyses, six NIST SRMs covering a range of matrices with certified and reference values for the elements of interest have been distributed. A new Japanese reference diet material has also been developed. These quality assurance procedures are summarized here and new data are presented for Cs, I, Sr, Th and U in the NIST SRMs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006712813369
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  • 10
    Electronic Resource
    Electronic Resource
    Loss of sample weight during long time reactor iradiation of biological materials (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 84 (1984), S. 201-206 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Loss of sample weight due to matrix decomposition of erythrocytes, whole blood and blood plasma during long time reactor irradiation was investigated. During a weighing sequence extending over an interval of 5 days with respect to the time of opening of the sample contained in sealed quartz tubes, a loss of sample material up to 11% was observed. Use of post-irradiation weight of partly recovered sample material introduces positively biased systematic error to the results. It is necessary to use preirradiation weight with 100% post irradiation sample recovery in order to eliminate this type of errors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02038197
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