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  • 1
    Call number: MOP Per 581(1/10) ; ZSP-319/A-10 ; ZSP-319/A-10(2. Ex.)
    In: Geodätische und geophysikalische Veröffentlichungen : Reihe 1, Heft 10
    Type of Medium: Series available for loan
    Pages: 139 Seiten , Illustrationen
    ISSN: 0533-7577
    Series Statement: Geodätische und geophysikalische Veröffentlichungen : Reihe 1 10
    Language: German
    Note: INHALTSVERZEICHNIS: ZUSAMMENFASSUNG (deutsch, englisch, russisch). - 1. EINLEITUNG. - 1.1 Wissenschaftliche Aufgabenstellung. - 1.2 Meßort und Maßzeitraum. - 1.3 Verwendetes Datenmaterial. - 2. ANALYSE DER HEP-ABREGNUNGSPHASEN IM TAGESGANG. - 2.1 Tagesgänge der HEP-Ionisation in hohen Breiten. - 2.2 Tagesgänge in mittelhohen Breiten und Nachwirkungseffekte. - 3. PARTIKELPAAZIPITATION WÄHREND AUSGEWÄHLTER POLARLICHTERSCHEINUNGEN. - 3.1 Allgemeines. - 3.2 Substorm-Eventuntersuchungen während der 21. SAE. - 3.2.1 Zusammenstellung des Beobachtungsmaterials. - 3.2.2 Polarlicht und auroraler Elektrojet. - 3.2.3 Polarlicht und ionosphärische Absorption. - 3.2.4 Die breitenmäßige Verteilunq der Polarlichtluminosität. - 3.2.5 Beobachtete Intensitätsverhältnisse von Polarlichtemissionen. - 3.3 Substorm-Eventuntersuchungen während der 22. SAE. - 3.3.1 Zusammenstellung des Beobachtungsmaterials. - 3.3.2 Eventbeschreibung. - 3.3.3 Diskussion der Beobachtungsresultate der 22. SAE. - 4. STEUERUNG DER PARTIKELPRÄZIPITATION DURCH DEN SOLAREN WIND UND DAS INTERPLANETARE MAGNETFELD. - 4.1 Physikalische Modellvorstellungen zur Energieübertragung aus dem Sonnenwind in die Erdatmosphäre. - 4.2 Einfluß von IMF-Sektordurchgängen auf das ionosphärische Plasma. - 4.3 Tages- und jahreszeitlicher Einfluß der IMF-Sektorstruktur auf das ionosphärische Plasma. - 4.4 Auswirkungen solarer Plasmaströme auf das ionosphärische Plasma. - 4.5 Vergleich der Energieübertragungsfunktion mit ionosphärischen Meßergebnissen. - 4.6 Zusammenfassung und Diskussion. - 5. EINIGE SPEZIELLE MIT DER PARTIKELEINREGNUNG VERBUNDENE PROBLEME. - 5.1 Exzessive D-Schicht Ionisation mittlerer Breiten in Sturm- und Nachwirkungsphase. - 5.2 Einige statistische Betrachtungen zur Rolle des D-Schicht Plasmas als Tracer für die HEP-Einregnung und NO Akkumulation. - 5.3 Exkursion zum statistischen Zusammenhang von Kp-Indizes und Events in A2-Messungen. - 5.4 Einige Bemerkungen zur Rolle der HEP II-Flüsse bei der Winteranomalie. - 6. ZUSAMMENFASSUNG UND EINSCHÄTZUNG DER ERGEBNISSE. - ABBILDUNGEN. - FIGURE CAPTIONS. - LITERATURVERZEICHNIS. - Anhang 1: Ionosphärische Absorptionsmessunqen in hohen Breiten (J. BREMER, K. EVERS, D. KEUER, H. RÖSSLER). - Anhang 2: Beobachtung von Polarlichtern mit dem Spektralphotometer (A. GRAFE). , Zusammenfassung in deutscher, englischer und russischer Sprache
    Location: MOP - must be ordered
    Location: AWI Archive
    Location: AWI Archive
    Branch Library: GFZ Library
    Branch Library: AWI Library
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 48 (1982), S. 183-189 
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Crude membrane fractions of Dictyostelium discoideum show the capacity to synthesize (1-3H)dolicholphosphate from (1-3H)dolichol. Formation of dolicholphosphate increased continuously over the first 15 min. The reaction rate was nearly linear with respect to the dolichol content up to 150 µM. The phosphate donor for the reaction is CTP. The optimum concentration of CTP is about 0,75 mM. The reaction is dependent on divalent metal ions, magnesium being more effective than calcium or manganese. The activity of the polyisoprenol kinase depends on the course of the early development. Maximum enzyme activities are present 4–6 h after the induction of the differentiation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 20 (1978), S. 3-15 
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary In the slime mold Dictyostelium discoideum polyisoprenylphosphomannosides are substrates for membrane bound mannosyltransferases; the isolated and purified isoprenyl derivatives transfer mannose to protein in vitro in presence of membrane fractions. The biosynthesis of the mannolipids as well as the biosynthesis of a glucose containing cerebroside, which becomes synthesized in an early stage of the cell development proceeds under control of the cell differentiation. The isolation procedure and the properties of the glycolipids are described, and their functions for the cellular development are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 355-357 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thin carbonized SiC layers were investigated by Auger depth profiling. If the layers are smooth, ion induced mixing and Auger electron escape depth are the dominant factors that degrade the depth profiles. With the help of the Monte Carlo simulation code T-DYN by Biersack and an escape depth correction program, simulations can describe the measured Auger depth profiles. For quantitative comparison of simulations and measurements the Auger data must be quantified. The sputter time scale must be converted into depth using a known or best fitting sputter rate. The Auger peak-to-peak height must be converted into concentration using sensivity factors which do not include the sputter correction for selective sputtering. Since these sensitivity factors are normaly estimated at a sputtered single crystal, selective sputter correction must be excluded later. A good quantitative agreement was found for a simulated adsorbate/SiC/Si layer system with a measured Auger depth profile of a carbonized SiC layer on Si. This allows a description of the layer structure and of the composition of the layers.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 564-568 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Problems of the evaluation of Auger depth profiles of thin SiC layers are caused by a number of effects. These are coverage with an adsorbate layer, preferential sputtering, the change of the peak shapes by chemical bonding states and the broadening of the interfaces by atomic mixing, Auger electron escape depth and original surface, interface and sputtering induced roughness. These effects are investigated and their contribution to the degradation of the depth profile is considered. Atomic mixing simulations including electron escape depth correction are able to reproduce the Auger depth profiles. In special cases the simulation must be convoluted with a resolution function caused by roughness. Thus quantitative conclusions about the layer structure, film composition, impurity distribution etc. are possible.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 195-198 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The concentrations and the lattice structure of silicon carbide layers and single crystals are influenced by ion beam sputtering. The influence of ion beam sputtering and primary ion energy on preferential sputtering is investigated by Auger measurements and T-DYN simulations. In dependence on primary ion energy C is enriched. Preferential sputtering increases with decreasing ion energy. Sputtering has a strong influence on the Auger peak shapes of SiC. Except for low ion energy and glancing incidence the peak shapes are independent of the primary ion energy. T-DYN simulations help to explain and understand the near-surface processes during sputtering of SiC. For ion energy dependence of preferential sputtering there is a good agreement of the T-DYN simulation and the Auger measurement.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 368 (2000), S. 326-334 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An important step of the factor analysis method is the determination of the number of significant factors. Common techniques as Malinowski indicator function provide perhaps uncertain results in spectroscopic cases depending on signal to noise ratio, the overlap of spectra, sample misalignment and concentration of the factors. ¶A new method for the determination of the number of components in Auger depth profiling is established. The new method of correlation of abstract basic spectra (CABS) takes into consideration the influence of experimental error especially noise. Simulations were carried out, to prove the CABS method. The results are compared with those obtained by established methods. Auger depth profiles of SiC and Si3N4-layers on Si(111) were analyzed by means of the CABS method and Target Factor Analysis. Aspects of data pretreatment as filtering are discussed.
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  • 8
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Mannosyltransferases in plasma membranes ofDictyostelium discoideum synthesize polyisoprenyl-phosphomannosides from exogenous polyisoprenylphosphates and GDP-mannose. The specificity of the enzymes depends on the chain length and the saturation of the polyisoprenols. Maximum activity is reached by a α-saturated C-55 polyisoprenylphosphate.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 16 (1877), S. 363-364 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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