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  • 1
    Monograph available for loan
    Monograph available for loan
    Planetary magnetism (2010)
    New York, NY [u.a.] : Springer
    Associated volumes
    Details Availability
    Call number: 5/M 18.91371
    In: Space science series of ISSI
    Type of Medium: Monograph available for loan
    Pages: 664 Seiten , Ill., graph. Darst., Kt. , 235 mm x 155 mm
    ISBN: 9781441959003
    Series Statement: Space Sciences Series of ISSI 33
    URL: Inhaltsverzeichnis
    Classification:
    Geomagnetism, Geoelectromagnetism
    Language: English
    Note: Planetary magnetism : foreword / A. Balogh ... [et al.] -- Space exploration of planetary magnetism / N.F. Ness -- Planetary magnetic field measurements : missions and instrumentation / A. Balogh -- Current systems in planetary magnetospheres and ionospheres / W. Baumjohann ... [et al.] -- Separation of the magnetic field into external and internal parts / N. Olsen, K.-H. Glassmeir, X. Jia -- The magnetic field of planet Earth / G. Hulot ... [et al.] -- Crustal magnetic fields of terrestrial planets / B. Langlais ... [et al.] -- Magnetic fields of the outer planets / C.T. Russell, M.K. Dougherty -- Magnetic fields of the satellites of Jupiter and Saturn / X. Jia ... [et al.] -- The magnetic field of mercury / B.J. Anderson ... [et al.] -- Paleomagnetic records of meteorites and early planetesimal differentiation / B.P. Weiss ... [et al.] -- Induced magnetic fields in solar system bodies / J. Saur, f.M. Neubauer, K.-H. Glassmeier -- The interior structure, composition, and evolution of giant planets / J.J. Fortney, N. Nettelmann -- Thermal evolution and magnetic field generation in terrestrial planets and satellites / D. Breuer, S. Labrosse, T. Spohn -- Theory and modeling of planetary dynamos / J. Wicht, A. Tilgner -- Laboratory dynamo experiments / G. Verhille ... [et al.] -- Dynamo scaling laws and applications to the planets / U.R. Christensen -- The solar dynamo / C.A. Jones, M.J. Thompson, S.M. Tobias -- Dynamo models for planets other than Earth / S. Stanley, G.A. Glatzmaier -- Planetary magnetic fields : achievements and prospects / D.J. Stevenson..
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics and local boundary properties of the dawn-side magnetopause under conditions observed by Equator-S (1999)
    Springer
    Annales geophysicae 17 (1999), S. 1535-1559 
    Details
    ISSN: 0992-7689
    Keywords: Magnetospheric physics (magnetopause ; cusp ; and boundary layers ; magnetosheath ; magnetospheric configuration and dynamics)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Magnetic field measurements, taken by the magnetometer experiment (MAM) on board the German Equator-S spacecraft, have been used to identify and categorise 131 crossings of the dawn-side magnetopause at low latitude, providing unusual, long duration coverage of the adjacent magnetospheric regions and near magnetosheath. The crossings occurred on 31 orbits, providing unbiased coverage over the full range of local magnetic shear from 06:00 to 10:40 LT. Apogee extent places the spacecraft in conditions associated with intermediate, rather than low, solar wind dynamic pressure, as it processes into the flank region. The apogee of the spacecraft remains close to the magnetopause for mean solar wind pressure. The occurrence of the magnetopause encounters are summarised and are found to compare well with predicted boundary location, where solar wind conditions are known. Most scale with solar wind pressure. Magnetopause shape is also documented and we find that the magnetopause orientation is consistently sunward of a model boundary and is not accounted for by IMF or local magnetic shear conditions. A number of well-established crossings, particularly those at high magnetic shear, or exhibiting unusually high-pressure states, were observed and have been analysed for their boundary characteristics and some details of their boundary and near magnetosheath properties are discussed. Of particular note are the occurrence of mirror-like signatures in the adjacent magnetosheath during a significant fraction of the encounters and a high number of multiple crossings over a long time period. The latter is facilitated by the spacecraft orbit which is designed to remain in the near magnetosheath for average solar wind pressure. For most encounters, a well-ordered, tangential (draped) magnetosheath field is observed and there is little evidence of large deviations in local boundary orientations. Two passes corresponding to close conjunctions of the Geotail spacecraft are analysed to confirm boundary orientation and motion. These further show evidence of an anti-sunward moving depression on the magnetopause (which is much smaller at Equator-S). The Tsyganenko model field is used routinely to assist in categorising the crossings and some comparison of models is carried out. We note that typically the T87 model fits the data better than the T89 model during conditions of low to intermediate Kp index near the magnetopause and also near the dawn-side tail current sheet in the dawnside region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-1535-x
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  • 3
    Electronic Resource
    Electronic Resource
    Modulation of glyceraldehyde-3-phosphate dehydrogenase inAnacystis nidulans by glutathione (1982)
    Springer
    Archives of microbiology 133 (1982), S. 2-5 
    Details
    ISSN: 1432-072X
    Keywords: Anacystis nidulans ; Cyanobacterium ; Glutathione ; Glyceraldehyde-3-phosphate dehydrogenase ; Redox modulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.13; GAPDH) from the cyanobacteriumAnacystis nidulans was activated up to five-fold by reduced glutathione (GSH) in the physiological concentration range (0.1–2 mM GSH). Non-physiological reductants, like dithiothreitol (DTT) and β-mercaptoethanol, also activated the enzyme. Oxidized glutathione (GSSG) had no effect on the cyanobacterial GAPDH but treatment with H2O2 led to a rapid, reversible deactivation of both untreated and GSH-treated enzyme preparations. GSH reversed the inhibition induced by H2O2. An oligomeric form of the enzyme (apparentM r∼440,000) was dissociated by GSH into a lower-M r, more active enzyme form (M r∼200,000). The enzyme was shown to obey regular Michaelis-Menten kinetics. The activation of GAPDH by GSH was associated with a decrease inK m and an increase inV max values of the enzyme for 3-phosphoglycerate. GSH had virtually no effect on a GAPDH preparation isolated from corn chloroplasts and studied for comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00943760
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  • 4
    Electronic Resource
    Electronic Resource
    An investigation of point defects in silicon carbide (1995)
    Springer
    Applied physics 61 (1995), S. 55-58 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.70; 68.55; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Positron lifetime measurements on bulk samples of single crystal SiC wafers have shown that both 6H and 4H polytypes exhibit a bulk lifetime of 150±2 ps. All samples contained a second, defect-related lifetime component, ranging in value from 250 to about 300 ps with rather low intensities. The defect structure exhibited by the nanocrystalline samples is, not unexpectedly, much more complex. Positron beam experiments on Electron Cyclotron Resonance Chemical Vapour Deposited (ECR-CVD) SiC thin films showed that the positrons are very sensitive to changes in important film parameters as a function of the deposition conditions. It was found that the film density is lower than expected, probably due to hydrogen incorporation; variations in composition among different films were detected through variations in the S parameters, and differences were observed in the electric field at the film–substrate interface due to hydrogen passivation of dangling bonds and different substrate resistivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538211
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  • 5
    Electronic Resource
    Electronic Resource
    Can oral contraceptive steroids influence the elimination of nifedipine and its primary pryidine metabolite in humans? (1998)
    Springer
    European journal of clinical pharmacology 54 (1998), S. 729-734 
    Details
    ISSN: 1432-1041
    Keywords: Key words Oral contraceptives ; Nifedipine ; Pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: To investigate the influence of oral contraceptives on cytochrome P450 3A4 (P450NF) activity. Methods: In 23 healthy women, the pharmacokinetics of nifedipine and its main metabolite dehydronifedipine in plasma were assessed after a single oral dose, prior to and after intake of one of two oral contraceptive formulations, one containing 2 mg dienogest and 0.03 mg ethinylestradiol (group A) and the other containing 0.125 mg levonorgestrel and 0.03 mg ethinylestradiol (group B). Results: While the intake of two oral contraceptives for 21 days did not influence the plasma concentration-time curve of unchanged nifedipine, mean AUC0–23.5 h and the mean Cmax values of dehydronifedipine were significantly lower in both groups tested/(24% in group A and 25% in group B). This observation may indicate a reduced formation rate of metabolites and reflects an inhibition of cytochrome P450 3A4 activity. The activation of the same or other metabolic degradation mechanism(s) could explain this result. Conclusion: The investigation presented demonstrates the importance of metabolite measurement when in vivo studies are undertaken to investigate different influences on drug metabolizing ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002280050543
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of ethinylestradiol-containing combination oral contraceptives with gestodene or levonorgestrel on caffeine elimination (1995)
    Springer
    European journal of clinical pharmacology 48 (1995), S. 161-166 
    Details
    ISSN: 1432-1041
    Keywords: Caffeine clearance ; Oral contraceptives ; gestodene ; levonorgestrel ; ethinylestradiol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract In a controlled clinical trial, the elimination of caffeine was examined in 20 healthy women prior to and during one cycle of treatment with either of two oral contraceptive formulations, one containing 0.075 mg gestodene and 0.03 mg ethinylestradiol and one containing 0.125 mg levonorgestrel and 0.03 mg ethinylestradiol. In addition, caffeine clearance was determined 1 month after the last intake of the oral contraceptives. Compared with pretreatment values, the clearance of caffeine was reduced by about 54% and 55% after one treatment cycle with gestodene- and the levonorgestrel-containing oral contraceptive, respectively. Other pharmacokinetic parameters of caffeine, such as t max and C max, were not affected. Clearance values returned to pretreatment values 1 month after the last administration of the oral contraceptives. There was no difference in the reduction of caffeine clearance between contraceptive formulations. A small, but significant difference in the AUC(0–24 h) values of ethinylestradiol was noted between both preparations. There was no correlation between the AUC(model) values of caffeine and the AUC(0–24 h) values of ethinylestradiol. In the present study, a somewhat more pronounced effect on the elimination of caffeine was observed than in previous investigations, where several contraceptive steroids were administered only for a period of 2 weeks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192743
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  • 7
    Electronic Resource
    Electronic Resource
    Smart Properties of an Irradiated High-T〈sub〉c 〈/sub〉Superconductor (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 54 (Sept. 2008), p. 227-230 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Effects of high-energy, heavy ion irradiation on the properties of Y-Ba-Cu-O high-Tcsuperconductors are examined. The irradiating medium consists of accelerated Bi-ions, havingatomic weight of 114.82. The detected hysteresis loops have very different forms and sizes inunirradiated and in irradiated states, referring to the strong effect of the irradiation. Strikingvariations of critical current- and magnetic parameters up to the extent of 30-40% in this series ofspecimens were detected. Their direct reason can be looked for in the change of the atomicmolecularmicrostructure of the specimens, as an effect due to the irradiation. This is decided byboth of the energy and density of the ions arriving onto the surface of the samples [1,2]. It meansthat the effect produced by the irradiating individual ions depends also on the exact local place ofthe specimens, on nanometer scale, determined by their given molecular structure, bondingrelationships and microstructural stability. In this way, the irradiation experiments can providesome new information on the atomic-molecular properties of the specimens in question. As agenuine smart material, the Y1Ba2Cu3O7-d high-Tc superconductor is able to reply to any externalinfluence, changing its own qualities according to that effect
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.54.227.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Change of Superconducting Parameters of Y-Ba-Cu-O Slabs and Rings due to High-Energy Ion Beams (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 47 (Oct. 2006), p. 63-68 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Different high-Tc superconducting Y-Ba-Cu-O samples of slabs and rings have beeninvestigated. Using differently prepared Y1Ba2Cu3O7-d materials, significant deviations betweenirradiated and unirradiated specimens have been detected in their properties. These investigationsdemonstrate that unlikely prepared superconductors are differently sensitive to the externalirradiation, although they have the same composition. The irradiation applied during theseexperiments consisted of high-energy Bi-ions with the flux of 5x1010 ions/cm2 and with the energyof 720 MeV. As is experienced, a considerable variation of the magnetic moment in the extent of19-44% and a significant increase of the critical current density up to 41% can be detected. Theseoriginate from the change of the properties of materials due to the irradiation. For the evaluation ofthe experiments a new fitting method is elaborated for the temperature dependence of the criticalcurrent density, providing fully correct results for the whole temperature interval. The A.C.magnetic measurements show, that the irradiation causes to reach the state of the perfectdiamagnetism at higher temperatures, than in the case of unirradiated samples. Similarly, theirradiated specimens have much lower losses, than the unirradiated ones and even these smallervalues disappear at low temperatures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.47.63.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Identification of magnetosheath mirror modes in Equator-S magnetic field data (1999)
    Springer
    Annales geophysicae 17 (1999), S. 1560-1573 
    Details
    ISSN: 0992-7689
    Keywords: Magnetospheric physics (magnetosheath ; plasma waves and instabilities ; magnetopause ; cusp and boundary layers)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Between December 1997 and March 1998 Equator-S made a number of excursions into the dawn-side magnetosheath, over a range of local times between 6:00 and 10:40 LT. Clear mirror-like structures, characterised by compressive fluctuations in |B| on occasion lasting for up to 5 h, were observed during a significant fraction of these orbits. During most of these passes the satellite appeared to remain close to the magnetopause (within 1–2 Re), during sustained compressions of the magnetosphere, and so the characteristics of the mirror structures are used as a diagnostic of magnetosheath structure close to the magnetopause during these orbits. It is found that in the majority of cases mirror-like activity persists, undamped, to within a few minutes of the magnetopause, with no observable ramp in |B|, irrespective of the magnetic shear across the boundary. This suggests that any plasma depletion layer is typically of narrow extent or absent at the location of the satellite, at least during the subset of orbits containing strong magnetosheath mirror-mode signatures. Power spectra for the mirror signatures show predominately field aligned power, a well defined shoulder at around 3–10 × 10−2 Hz and decreasing power at higher frequencies. On occasions the fluctuations are more sinusoidal, leading to peaked spectra instead of a shoulder. In all cases mirror structures are found to lie approximately parallel to the observed magnetopause boundary. There is some indication that the amplitude of the compressional fluctuations tends to be greater closer to the magnetopause. This has not been previously reported in the Earth’s magnetosphere, but has been suggested in the case of other planets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-1560-9
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  • 10
    Electronic Resource
    Electronic Resource
    Detection of zero anisotropy at 5.2 AU during the November 1998 solar particle event: Ulysses Anisotropy Telescopes observations (2000)
    Springer
    Annales geophysicae 18 (2000), S. 277-284 
    Details
    ISSN: 0992-7689
    Keywords: Interplanetary physics (energetic particles) ; Solar physics, astrophysics and astronomy (energetic particles) ; Space plasma physics (instruments and techniques)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract For the first time during the mission, the Anisotropy Telescopes instrument on board the Ulysses spacecraft measured constant zero anisotropy of protons in the 1.3/2.2 MeV energy range, for a period lasting more than three days. This measurement was made during the energetic particle event taking place at Ulysses between 25 November and 15 December 1998, an event characterised by constant high proton fluxes within a region delimited by two interplanetary forward shocks, at a distance of 5.2 AU from the Sun and heliographic latitude of 17°S. We present the ATs results for this event and discuss their possible interpretation and their relevance to the issue of intercalibration of the two telescopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-000-0277-6
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