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  • 1
    Electronic Resource
    Electronic Resource
    Radial distribution of space-charge force in compensated positive-ion beams (invited) (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1094-1099 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The space-charge compensated state of drifting dc beams of He+ ions of 10 keV ion energy and 0.14 and 1.5 mA current was determined with an electron beam probe, a rf resonance probe, the analysis of residual gas ion energies, and emittance measurement. The results are compatible with a basic model describing a two-dimensional multiplicity of possible self-consistent radial density distributions of beam ions, residual gas ions, and compensating electrons. The effects of electron drainage and beam current oscillations on space-charge compensation are pointed out. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148650
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  • 2
    Electronic Resource
    Electronic Resource
    Switching dependence on fabrication accuracy of tapered ends of a single giant magnetoresistance memory cell in word disturb condition (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6193-6195 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct integration of the Landau–Lifshitz–Gilbert equation in a three-dimensional rectangular lattice shows that fabrication asymmetry of tapered ends affects the magnetic switching behavior of the magnetic layers of a pseudospin valve (PSV) memory cell in word disturb condition. When a 10 nm asymmetry is introduced with the longer sides of the tapers on the same side of the PSV memory cell, a "360°" wall in the storage layer is formed when a 40 Oe uniform word disturb field is applied opposite to the magnetization direction in the storage layer. The initial magnetization state is recovered when the field is turned off. When the longer sides of the tapers are on opposite sides of the cell, complete magnetization reversal occurs in the storage layer. The sense layer and the storage layer relax to an antiparallel configuration magnetization that is opposite to the initial configuration in the memory cell when the field is turned off. The information is lost. Successful operation of the memory depends upon a fabrication accuracy that is better than 10 nm. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370218
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum reflection and transmission of ballistic two-dimensional electrons by a potential barrier (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1154-1156 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the reflection and transmission coefficients of ballistic two-dimensional electrons by a potential barrier, induced via a surface gate, reveal that both coefficients vary gradually with the barrier height when it is less then the electron Fermi energy. Superimposed on the gradual variation, oscillatory structure which are consistent with interference resonances are also observed. The data imply that the potential barrier seen by the two-dimensional electrons is sharp compared to the electron wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112126
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of a Total Solar Eclipse on the Mesoscale Atmospheric Circulation over Europe – A Model Experiment (1999)
    Springer
    Meteorology and atmospheric physics 71 (1999), S. 229-242 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary ¶On August the 11th, 1999 Central Europe saw a spectacular astronomical event, a total solar eclipse. We present a model study concerning the meteorological effects of this eclipse in central Europe using the state-of-the-art limited area forecast model Deutschland-Modell DM from the German Weather Service DWD. Under typical summer radiation conditions very strong anomalies in the surface energy flux and temperature in screen height are simulated. The main temperature signal in the lower troposphere is delayed by about one hour with respect to the surface. Furthermore it is connected with a well defined dynamical signal which is reminiscent to a large scale land – sea circulation. The event could be used as a test case for mesoscale atmospheric models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007030050057
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  • 5
    Electronic Resource
    Electronic Resource
    Colicin M is inactivated during import by its immunity protein (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 388-396 
    Details
    ISSN: 1617-4623
    Keywords: Escherichia coli ; Colicin M ; Immunity ; Periplasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Colicin M (Cma) displays a unique activity that interferes with murein and O-antigen biosynthesis through inhibition of lipid-carrier regeneration. Immunity is conferred by a specific immunity protein (Cmi) that inhibits the action of colicin M in the periplasm. The subcellular location of Cmi was determined by constructing hybrid proteins between Cmi and the TEM-β-lactamase (BlaM), which confers resistance to ampicillin only when it is translocated across the cytoplasmic membrane with the aid of Cmi. The smallest Cmi'-BlaM hybrid that conferred resistance to 50 μg/ml ampicillin contained 19 amino acid residues of Cmi; cells expressing Cmi'-BlaM with only five N-terminal Cmi residues were ampicillin sensitive. These results support a model in which the hydrophobic sequence of Cmi comprising residues 3–23 serves to translocate residues 24–117 of Cmi into the periplasm and anchors Cmi to the cytoplasmic membrane. Residues 8–23 are integrated in the cytoplasmic membrane and are not involved in Cma recognition. This model was further tested by replacing residues 1–23 of Cmi by the hydrophobic amino acid sequence 1–42 of the penicillin binding protein 3 (PBP3). In vivo, PBP3'-'Cmi was as active as Cmi, demonstrating that translocation and anchoring of Cmi is not sequence-specific. Substitution of the 23 N-terminal residues of Cmi by the cleavable signal peptide of BlaM resulted in an active BlaM'-'Cmi hybrid protein. The immunity conferred by BlaM'-'Cmi was high, but not as high as that associated with Cmi and PBP3'-'Cmi, demonstrating that soluble Cmi lacking its membrane anchor is still active, but immobilization in the cytoplasmic membrane, the target site of Cma, increases its efficiency. CmiΔ1-23 remained in the cytoplasm and conferred no immunity. We propose that the immunity protein inactivates colicin M in the periplasm before Cma can reach its target in the cytoplasmic membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172531
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of dietary nicotine and colony source ofManduca sexta [Lepidoptera: Sphingidae] on its suitability as a host ofCotesia congregata [Hymenoptera: Braconidae] (1990)
    Springer
    BioControl 35 (1990), S. 223-231 
    Details
    ISSN: 1573-8248
    Keywords: Manduca sexta ; nicotine ; Cotesia congregata ; strains ; Manduca sexta ; nicotine ; Cotesia congregata ; souches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Une expérimentation a été entreprise afin de déterminer si les différences enregistrées entre deux colonies distinctes deM. sexta, affectées également par le régime nicotiné, influencent le développement, la survie et la taille de son parasitoïdeCotesia congregata. Les sphynx du tabac d'une colonie du Maryland et de la Caroline du Nord ont été élevés sur un milieu à 0,1 % de nicotine et exposés au parasitisme parC. congregata. Les individus de la colonie du Maryland furent en général de meilleurs hôtes que ceux de la colonie de Caroline du Nord. Bien que la nicotine ait des effects négatifs sur les deux colonies, ceux-ci furent plus sévères chez les individus parasitant les sphynx de Caroline du Nord.
    Notes: Abstract Larval tobacco hornworms,Manduca sexta (L.), of 2 different colonies were exposed to parasitism by the gregarious endoparasitoid,Cotesia congregata (Say). A comparison was made of parasitoid larval, pre-pupal, and pupal mortality, female and male dry weight and larval development time. In general, “Maryland” hornworms were more suitable hosts than “North Carolina” hornworms. Although the presence of dietary nicotine increased parasitoid mortality in individuals reared from hornworms of both colonies, the effect was more severe among individuals parasitizing the North Carolina hornworms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374797
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  • 7
    Electronic Resource
    Electronic Resource
    2,6-Diamino-2,6-Didesoxy-D-Allose aus Glukosamin unter Verwendung einer Inversion mit Thionylchlorid (1964)
    Springer
    Naturwissenschaften 51 (1964), S. 509-510 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632214
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  • 8
    Electronic Resource
    Electronic Resource
    Bildungsenthalpie von Uranpentachlorid (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 924-927 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Standardbildungsenthalpie von UCl5 [ΔH B ,298/0 UCl5 (s)=−247,7±0,5 kcal/Mol (−1036,4±2,1 kJ/ Mol)] wurde bestimmt, indem man Uran mit gasförmigem Chlor in Gegenwart eines Überschusses an flüssigem Chlor bei 298° K zur Reaktion brachte.
    Notes: Abstract The standard enthalpy of formation of UCl5 has been determined as ΔH f ,298/0 UCl5 (s)=−247.7±0.5 kcal/mol (−1036.4±2.1 kJ/mol) by reacting uranium with chlorine gas in the presence of excess liquid chlorine at 298° K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01167276
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  • 9
    Electronic Resource
    Electronic Resource
    Äther-Ester und Diäther von Äthylenglykolen (1968)
    Springer
    Monatshefte für Chemie 99 (1968), S. 652-657 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Für Untersuchungen über das Viskositäts- und Dichte-Temperatur-Verhalten und andere physikalische Eigenschaften wurden Äther-Ester und einige Diäther des Äthylenglykols synthetisiert. Die Verbindungen sind so ausgesucht, daß sie in einem experimentell leicht zugänglichen Temperaturbereich kinematische Viskositäten zwischen 1 und 15 cSt aufweisen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901216
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  • 10
    Electronic Resource
    Electronic Resource
    Konstitution und physikalische Eigenschaften von Äthern, 3. Mitt.: Über Äther vom Typ n-C4H9-(O-CH2-CH2)n-OR und i-C4H9-(O-CH2-CH2)n-OR (1959)
    Springer
    Monatshefte für Chemie 90 (1959), S. 783-786 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Zur Untersuchung des Viskositäts-Temperatur-Verhaltens wurden weitere 23 gemischte Diäther des Äthylenglykols und Diäthylenglykols, und zwar vier homologe Reihen, dargestellt, deren Arbeitsvorschriften und physikalische Eigenschaften mitgeteilt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905665
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