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  • 1990-1994  (5)
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  • 1
    Digitale Medien
    Digitale Medien
    Constraints from noble-gas contents on the origin of carbonado diamonds (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 472-474 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] We studied two carbonados from Brazil and two from Africa, all from different localities. Before the noble gas experiments, samples were thoroughly cleaned with hot HNO3 and HF. Noble gases were extracted by heating the samples at temperatures up to 2,000 á°C (graphitization temperature ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/351472a0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Increased soluble IL-2 receptor in serum of patients with systemic lupus erythematosus (1993)
    Springer
    Clinical rheumatology 12 (1993), S. 204-209 
    Details
    ISSN: 1434-9949
    Schlagwort(e): sIL-2R ; sCD4 ; sCD8 ; SLE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary We estimated the concentration of soluble IL-2R (sIL-2R) in the serum of patients with systemic lupus erythematosus (SLE) and examined the relationship between the serum levels of sIL-2R and clinical features or laboratory data. We found that elevated levels of sIL-2R were present in the serum of SLE patients with discoid rash, and sIL-2R concentrations were correlated with the soluble CD4 and soluble CD8 concentrations but not with classical serological marker, anti-DNA antibody or complement titer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02231527
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Determination of selenium(IV) and selenium(VI) in natural water samples by neutron activation analysis after chemical pre-collection (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 187 (1994), S. 441-450 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract Neutron activation analysis using shortlived77mSe (T=17.5 s) preceded by chemical pre-collection of Se on activated carbon (AC) has been applied to the fractional determination of Se(IV) and Se(VI) in natural water samples such as river water and sea water. Two chemical procedures were adopted: adsorption of Se(IV)/Bismuthiol-II complex on AC and adsorption of Se(VI)/Bismuthiol-II on AC after reduction of Se(VI) to Se(IV). It was shown that Se(IV) and Se(VI) can be determined at a 〈μg l−1 (ppb) level in natural waters by the present method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02165774
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  • 4
    Digitale Medien
    Digitale Medien
    Phase and dose effects of13N in pile-irradiated propionic-d2 acid (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 155 (1991), S. 411-418 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract A sharp phase effect on the yields of13NH4 + and13NO2 − has been observed in propionic-d2 acid irradiated in a reactor similarly to the other carboxylic acids previously reported. In the formation of13NH4 +,13NO2 − and [13N]amide, there is no (H/D)-isotope effect between CH3CD2COOH and C2D5COOD systems unlike for protiated and deuterated benzene and cyclohexane. With a rise in irradiation dose from 100 to 400 MGy, the yield of13NH4 + increased, but that of13NO2 − decreased in proportion to the dose. The dose effect was clear more in liquid phase than in frozen one. The results are in harmony with the reaction mechanism proposed in our previous works.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02163635
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  • 5
    Digitale Medien
    Digitale Medien
    Chemical effect of13N formed in butyric-d7 acid irradiated in a pile (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 147 (1991), S. 207-214 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract A distinct phase effect was observed on the formation of13NH3, H13NOx and [13N]-amide in pile-irradiated butyric-d7 acid, although the magnitude of the effect was rather smaller than that in deuterated trifluoroacetic, acetic and propionic acids previously reported. In frozen butyric-d7 acid, most of13N was found in the forms such as13NH3 (54.8±0.7%), H13NOx (26.8±0.6%). and [13N]amide (15.9±1.8%). The yields of HC13N and [13N]aminobutyric acid were only 0.6±0.3 and 1.2±0.3% even in the liquid, respectively. The scavenger effect of acetic anhydride-d6 on the formation of13NH3, H13NOx and [13N]amide was examined. In liquid and frozen carboxylic acids, the yields of13NH3 and H13NOx were proportional and inversely proportional to the number of hydrogen atoms in a target molecule in the region of the number of hydrogen from unity to eight.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02040368
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