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  • 1
    Electronic Resource
    Electronic Resource
    High-Energy Particles in Solar Flares (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 33 (1995), S. 239-282 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.33.090195.001323
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stereoselectivity of Activation of 7,12-Dimethylbenz[a]anthracene 3,4-Dihydrodiol to the anti-Diol Epoxide Metabolite in a Human Mammary Carcinoma MCF-7 Cell-Mediated V79 Cell Mutation Assay (1995)
    s.l. : American Chemical Society
    Chemical research in toxicology 8 (1995), S. 970-978 
    Details
    ISSN: 1520-5010
    Source: ACS Legacy Archives
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/tx00049a011
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    ISOLATING THE FOOTPOINT CHARACTERISTICS OF A SOLAR FLARE LOOP (1997)
    Springer
    Solar physics 171 (1997), S. 103-122 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We analyse the physical characteristics of a C5.7 class flare which was observed on 27 September, 1993 using data from the soft X-ray telescope (SXT), the Bragg crystal spectrometer (BCS), and the hard X-ray telescope (HXT) on Yohkoh. The flare takes the form of a simple loop which is much brighter at one of its footpoints than anywhere else for a period of 2 min. During this time there is an increase in the soft X-ray fluxes, and a corresponding peak in hard X-rays. The parameters derived from the hard X-ray and soft X-ray spectra and images are assumed to be from the footpoint. This flare showed two peaks in the non-thermal velocity, the first one simultaneous with the footpoint brightening. The non-thermal velocity corresponding to these first few minutes is unusually large – by a factor of 80%, 68%, and 26% relative to the second peak in the Fexxv, Caxix, and Sxv channels respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004903027543
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  • 4
    Electronic Resource
    Electronic Resource
    THE SUN AS AN X-RAY STAR: OVERVIEW OF THE METHOD (1997)
    Springer
    Solar physics 172 (1997), S. 239-239 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a method to study the solar-stellar connection, i.e., the close similarity of the physical phenomena occurring on the Sun and on late-type active stars, by taking advantage of Yohkoh/SXT X-ray images. From such images, we first generate distribution functions of the whole disk differential emission measure, and then synthesize from these spectra analogous to those collected by X-ray telescope instruments aimed at stars other than the Sun. Here we illustrate the application of this method to the ROSAT/PSPC and ASCA/SIS, and discuss test cases as well as future applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004962623124
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  • 5
    Electronic Resource
    Electronic Resource
    Precise Determination of the Coordinate Systems for the Yohkoh Telescopes and the Application of a Transit of Mercury (1998)
    Springer
    Solar physics 180 (1998), S. 131-156 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Yohkoh solar X-ray observatory carries two telescopes that require coalignment at a level better than the minimum pixel size of 2_45″. This coalignment is needed both internally within Yohkoh and for many scientific applications involving data from ground-based radio and optical observatories. We describe the methods successfully developed for this purpose and now incorporated in the Yohkoh software. Soft X-ray observations of the 1993 transit of Mercury across the solar disk provided key information for the calibration of the coalignment procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005058818887
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  • 6
    Electronic Resource
    Electronic Resource
    Aglycone structure influences α-fucosyltransferase III activity using N-acetyllactosamine glycoside acceptors (1999)
    Springer
    Glycoconjugate journal 16 (1999), S. 725-730 
    Details
    ISSN: 1573-4986
    Keywords: substrate specificity ; fucosyltransferase ; glycosides ; N-acetyllactosamine ; N-acetylglucosaminides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We showed previously that Chinese hamster ovary cells took up and utilized a variety of N-acetylglucosaminides as primers of oligosaccharide biosynthesis (Ding et al., 1999, J. Carbohydr. Chem., 18:471–475). In this study, a library of N-acetylglucosaminides was enzymatically galactosylated in vitro to yield type 2 chain N-acetyllactosaminides bearing a variety of aglycones. Those disaccharides are potential acceptors for fucosyltransferases. As an extension of the previous study, we tested the type 2 chain disaccharyl glycosides (Galβ1,4-GlcNAcβ-R) for their aglycone-dependent acceptor specificity for α-L-fucosyltransferase III (Fuc-TIII). The enzyme activity significantly depended on the aglycone structures, suggesting that, in addition to the polar groups on the sugar moiety, the hydrophobic aglycone can substantially contribute to recognition in this reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007163510870
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  • 7
    Electronic Resource
    Electronic Resource
    A clinical perspective of accelerated statistical reconstruction (1997)
    Springer
    European journal of nuclear medicine 24 (1997), S. 797-808 
    Details
    ISSN: 1619-7089
    Keywords: Key words: Single-photon emission tomography ; Maximum likelihood reconstruction ; Fast image processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Although the potential benefits of maximum likelihood reconstruction have been recognised for many years, the technique has only recently found widespread popularity in clinical practice. Factors which have contributed to the wider acceptance include improved models for the emission process, better understanding of the properties of the algorithm and, not least, the practicality of application with the development of acceleration schemes and the improved speed of computers. The objective in this article is to present a framework for applying maximum likelihood reconstruction for a wide range of clinically based problems. The article draws particularly on the experience of the three authors in applying an acceleration scheme involving use of ordered subsets to a range of applications. The potential advantages of statistical reconstruction techniques include: (a) the ability to better model the emission and detection process, in order to make the reconstruction converge to a quantitative image, (b) the inclusion of a statistical noise model which results in better noise characteristics, and (c) the possibility to incorporate prior knowledge about the distribution being imaged. The great flexibility in adapting the reconstruction for a specific model results in these techniques having wide applicability to problems in clinical nuclear medicine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879671
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A clinical perspective of accelerated statistical reconstruction (1997)
    Springer
    European journal of nuclear medicine 24 (1997), S. 797-808 
    Details
    ISSN: 1619-7089
    Keywords: Single-photon emission tomography ; Maximum likelihood reconstruction ; Fast image processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although the potential benefits of maximum likelihood reconstruction have been recognised for many years, the technique has only recently found widespread popularity in clinical practice. Factors which have contributed to the wider acceptance include improved models for the emission process, better understanding of the properties of the algorithm and, not least, the practicality of application with the development of acceleration schemes and the improved speed of computers. The objective in this article is to present a framework for applying maximum likelihood reconstruction for a wide range of clinically based problems. The article draws particularly on the experience of the three authors in applying an acceleration scheme involving use of ordered subsets to a range of applications. The potential advantages of statistical reconstruction techniques include: (a) the ability to better model the emission and detection process, in order to make the reconstruction converge to a quantitative image, (b) the inclusion of a statistical noise model which results in better noise characteristics, and (c) the possibility to incorporate prior knowledge about the distribution being imaged. The great flexibility in adapting the reconstruction for a specific model results in these techniques having wide applicability to problems in clinical nuclear medicine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879671
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    Paper (German National Licenses)
    Fulltext
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