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  • 1990-1994  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Studies on dynamics of Mu reaction with NO2 by muon spin resonance and relaxation techniques (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 2091-2097 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of Mu with NO2 in a Kr atmosphere was studied by muon spin resonance and relaxation measurements at 300 K. It was found that the reaction proceeds via the following two steps: Mu+NO2→MuO+NO and MuO+NO2→MuNO3. In particular, the final product MuNO3 and the intermediate species MuO were successfully detected for the first time by the techniques of the muon spin resonance and the longitudinal relaxation under a high magnetic field of ∼2800 G. The rate constants of the Mu+NO2 and the MuO+NO2 reactions were determined to be (2.9±0.5)×1011 l mol−1 s−1 and (4.5±0.1)×109 l mol−1s−1 at 300 K. The isotope effect in the rate constant of the Mu+NO2 reaction in comparison with the H+NO2 reaction suggests that there are reaction paths with a slight energy barrier which is high enough to retard the H reaction, but not the Mu reaction. On the other hand, the rate constant of the MuO+NO2 reaction is smaller than 50% of those of the OH+NO2 and the OD+NO2 reactions. This isotope effect seems to originate from faster rotational motion of MuO and/or lower vibrational density of states at the transition state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467716
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Eosinophil cationic protein in peripheral blood of pediatric patients with allergic diseases (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 22 (1992), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have studied the levels of eosinophil cationic protein (ECP) and tumour necrosis factor (TNF) in peripheral blood obtained from 68 children with bronchial asthma and 11 children with atopic dermatitis. The ECP mean concentrations of the patients were 23.7 ± 21.4 μg/1 and 21.2 ± 18.7 μg/1 for bronchial asthma and atopic dermatitis respectively, which were significantly higher than the control value, 5.8 ± 2.3 μg/1 (P 〈 0.005). TNF was unmeasurable in almost all the samples and no significant difference was observed between normal controls and asthmatic children. A significant correlation was observed between serum levels of ECP and blood eosinophil counts in both diseases (r=0.873; P 〈 0.01 and r=0.740; P 〈 0.01, respectively). However, no obvious correlation was observed between serum levels of ECP and IgE levels. ECP levels were significantly reduced by treatment and normalized in parallel with blood eosinophil counts in the patients with total IgE levels less than 800 U/ml. Irrespective of the total IgE levels, the reduction of serum ECP levels was correlated with a decrease in the number of asthmatic attacks and/or improvement of pulmonary function. These results suggest that the ECP levels in peripheral blood indicate an increased activity of eosinophil and would be a more useful marker than eosinophil counts for making clinical analyses and estimating treatment efficacy in paediatric patients with allergic diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.1992.tb03083.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of (±)-2-hydroxymethyl-2,6-dimethylcyclohexan-1-ol (1990)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 168-170 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270189009789
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Somatotopic organization and columnar structure of vibrissae representation in the rat ventrobasal complex (1990)
    Springer
    Experimental brain research 81 (1990), S. 346-352 
    Details
    ISSN: 1432-1106
    Keywords: Vibrissae representation ; Ventrobasal complex ; Columnar organization ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The region of vibrissae representation in the ventrobasal complex (VB) of the rat was systematically mapped, based on receptive fields of many single neurons. Results showed that the ventralmost row of vibrissae projected to the rostral part of VB, that the dorsal-most row projected to the caudal part, and that the caudalmost vibrissae of each row projected to the most dorsolateral part of VB and more rostral vibrissae to the more ventromedial part. Further, it was revealed that the clusters of neurons receiving projections from any individual vibrissae formed corresponding columns extending from the anterodorsomedial to the posteroventrolateral direction, and that these columns piled up dorsoventrally and anteroposteriorly, with ventral ones shifted progressively medially. When cross sections of these columns were viewed on an oblique horizontal section of VB, a group of columns corresponding to each row lined up from the dorsolateral to the ventromedial direction with a rostral convexity, which means that the third or fourth vibrissa in each row projected most rostrally in that row. These results confirmed previous physiological mapping studies of vibrissal representation and are in good agreement with anatomical studies on barreloid structure in VB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228125
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Rapidly quenched intermetallic compounds, TiAl and Al3Ti (1990)
    Springer
    Journal of materials science 25 (1990), S. 3286-3290 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Two types of molten intermetallic compounds, with stoichiometric compositions TiAl and Al3Ti, are rapidly solidified at a cooling rate ranging from 104 to 105 Ksec−1 using a melt-spinning method. Solidified specimens are analysed by X-ray diffractometry and observed by a high-voltage electron microscope and an analytical transmission electron microscope. Extra phases other than stoichiometric composition phases were not detected for either TiAl or Al3Ti specimens by X-ray diffractometry. Both specimens have very small grains from 1 to 3 μm in diameter. TEM observation reveals that very fine precipitates (100 to 300 nm), which are not detected by X-ray diffractometry, are present within grains. They are Ti3Al in the TiAl specimens, and aluminium in the Al3Ti specimens, respectively. Electron micrographs of the Al3Ti specimens show the presence of pair dislocations (super dislocations) and anti-phase boundaries. They are believed to have been formed at high temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587688
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    Paper (German National Licenses)
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