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  • 1
    Electronic Resource
    Electronic Resource
    Clustering in a Non-Gaussian Cold Dark Matter Cosmogony (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 647 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb32232.x
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  • 2
    Electronic Resource
    Electronic Resource
    New far infrared laser lines from 13CH2F2 and frequency measurements (1991)
    Springer
    Applied physics 52 (1991), S. 32-35 
    Details
    ISSN: 1432-0649
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report new FIR laser lines from 13CH2F2 molecules optically pumped by a waveguide CO2 laser. The increased tunability (300 MHz) with respect to a conventional CO2 laser allows the pumping of 13CH2F2 vibrational transitions of large offset. 34 new laser lines have been discovered, ranging from 113.1 μm to 491.4 μm in wavelength, thus increasing the number of known FIR laser lines from this important molecule to 99. For all the new lines and many (36) of those known previously, precise offset measurements through the transferred Lamb-dip technique were performed. The frequency of six new laser lines was also directly measured by heterodyne detection with known laser lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405683
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  • 3
    Electronic Resource
    Electronic Resource
    Near-UV sub-Doppler spectroscopy on a metastable Mg beam by a frequency-doubled diode laser (1994)
    Springer
    Applied physics 59 (1994), S. 321-326 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 32.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near-UV radiation is generated by doubling the frequency of a semiconductor laser in a nonlinear crystal. The crystal is contained in a resonant cavity in order to improve the conversion efficiency. The cavity increases the efficiency by about three orders of magnitude. This radiation has been used to perform spectroscopy of metastable magnesium in an atomic beam. We observed the (3s3p)3 P−(3s3d)3 D transition multiplet, which is of interest for metrological applications. The isotopic shift between24Mg and26Mg was measured and new information on the hyperfine structure of25Mg was obtained. This radiation source is promising also in order to improve the Mg frequency standard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081400
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  • 4
    Electronic Resource
    Electronic Resource
    Lumbar canal stenosis: Results in 40 patients surgically treated (1988)
    Springer
    Acta neurochirurgica 94 (1988), S. 144-149 
    Details
    ISSN: 0942-0940
    Keywords: Lumbar canal stenosis ; clinical features ; neuroradiological examination ; surgical treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Authors present the clinical and neuroradiological characteristics of 40 patients treated for lumbar canal stenosis during a 10 years experience. The usefulness of computed tomography in comparison with myelography and plain X-rays of the spine is stressed. The surgical treatment was wide laminectomy involving one or more levels (two to four) plus an eventual foraminotomy but without discectomy. All patients were followed up and in 85% of cases a reduction of clinical symptoms was observed. Residual symptoms were also present in some of the improved patients, they generally accepted them without great dismay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435868
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  • 5
    Electronic Resource
    Electronic Resource
    Radio observations of early-type galaxies with dust lanes (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 215-220 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Radio and optical images of early-type galaxies with dust lanes have been analyzed in order to investigate the characteristics of the radio emission and to compare it with their properties at other frequencies. Except three galaxies, the remaining sources of our sample have diffuse radio emission, which does not extend beyond the stellar disk. The radio structures are small and weak (linear sizes in the range 2–10 kpc and radio powers in the range 5×1020–5×1021W Hz−1). Our preliminary results show that in a minority of cases (the most powerful radio sources) radio emission originates in the associated galactic nuclei, where a massive black hole is harboured. On the contrary, in the less powerful among our radio galaxies, sources originating from stellar phenomena may play and important role. We have classified the galaxies with respect to the dust lane morphology, comparing it with the radio emission. The sample is too small in order to reach firm conclusions, but the lack of radio sources in early-type galaxies with dust lanes along the galaxy minor axis seems to suggest that the accretion of material does not reach the conditions necessary to trigger nuclear activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652670
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  • 6
    Electronic Resource
    Electronic Resource
    N-body simulations of non-gaussian distributions: Topological analysis and evolution (1990)
    Springer
    Astrophysics and space science 171 (1990), S. 17-19 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract WithN-body simulations, we study the evolution of the large-scale structure of the Universe, assuming non-Gaussian initial conditions. We also discuss the sensitivity of different statistical tests to the change of the initial conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646814
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  • 7
    Electronic Resource
    Electronic Resource
    Intercellular spaces between macula densa cells: An ultrastructural study comparing high pressure perfusion fixation with in situ drip-fixation of rat kidney (1987)
    Springer
    Cell & tissue research 250 (1987), S. 461-464 
    Details
    ISSN: 1432-0878
    Keywords: Macula densa ; Intercellular spaces ; Ultrastructure ; Frusemide ; Tubulo-glomerular feedback ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In situ drip-fixation of superficial glomeruli and tubules in the rat kidney verified the results obtained from high pressure perfusion fixation studies indicating that distinct spaces normally exist between the cells of the macula densa. Following treatment with frusemide these intercellular spaces between the macula densa cells became closed in both drip-fixed and perfusion-fixed kidneys. These findings suggest that the variability of extracellular compartmentation found in the macula densa is unlikely to be an artifact but most likely represents changes in the in vivo status of the macula densa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219092
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  • 8
    Electronic Resource
    Electronic Resource
    High-performance ligand exchange chromatography on chiral diamine-bonded silica gel (1987)
    Springer
    Chromatographia 23 (1987), S. 118-120 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ligand-exchange chromatography ; Chiral bonded phase ; Racemate resolution ; Amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The resolution of racemates on chiral chemically bonded silica gel by high-performance ligand-exchange chromatography is described. The stationary phase was prepared by bonding (−) trans 1,2 cyclohexanediamine to silica gel through the coupling agent 3-glycidoxypropyl silane. The resolution of several α-amino acids and of compounds of pharmaceutical interest is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02312886
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  • 9
    Electronic Resource
    Electronic Resource
    High performance liquid chromatography assay for alanine amino transferase (1991)
    Springer
    Chromatographia 32 (1991), S. 23-26 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Enzyme assay ; Alanine amino transferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An improved method of alanine-amino transferase determination is proposed. The reaction is carried out with alanine and 2-oxoglutarate as substrates and analysis is by HPLC on a reversed-phase chromatographic system using a C18 column and tetrabutylammonium phosphate in phosphate buffer (pH 7.0)-acetonitrile as mobile phase. The enzyme activity was determined by directly following the formation of pyruvic acid without employing any secondary reaction, which is necessary in the spectrophotometric method. The detection limit of pyruvic acid is 10 pmole μl−1 and the standard deviation for the enzymatic activity of standard solutions is 5.4%. Furthermore under the chromatographic conditions selected it is possible to detect the presence of some intermediate species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262461
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  • 10
    Electronic Resource
    Electronic Resource
    Chitosan-coated silica gel as a new support in high-performance liquid chromatography (1987)
    Springer
    Chromatographia 23 (1987), S. 731-735 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chitosan-coated silica gel ; Nucleotides ; Amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new stationary phase was prepared by immobilizing the chitosan, a natural hydrophilic polymer, on microparticolate silica gel. The effect of the polarity, pH and ionic strength of the mobile phase has been studied in order to find optimal conditions for the separation of nucleotides and aminoacids. The influence of the properties of the mobile phase on the retention was examined, allowing to employ the chitosan-coated silica gel both to anion exchange and adsorption, depending on the pH and the polarity of the eluent used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02312665
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