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  • 2000-2004  (112)
  • 1965-1969  (52)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Laser : Verstärkung durch induzierte Emission ; Sender optischer Strahlung hoher Kohärenz und Leistungsdichte (1969)
    Berlin [u.a.] : Springer
    Details Availability
    Call number: O 3691
    Type of Medium: Monograph available for loan
    Pages: XV, 567 S. : graph. Darst.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of transparent Nb/two-dimensional electron gas contacts by using electron cyclotron resonance plasma cleaning (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4440-4442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of electron cyclotron resonance plasma cleaning on the contact resistance between a superconducting Nb layer and a two-dimensional electron gas in a strained InxGa1−xAs/InP heterostructure is investigated. Cleaning by a He/H plasma results in a rough semiconductor surface and a high interface resistance. In contrast, by using a pure He plasma a smooth semiconductor surface with a considerably lower interface resistance is obtained. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1290256
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  • 3
    Electronic Resource
    Electronic Resource
    Near-field photocurrent imaging of the optical mode profiles of semiconductor laser diodes (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1463-1465 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The potential of near-field photocurrent spectroscopy for direct imaging of mode profiles of submicron-sized waveguides in optoelectronic devices is demonstrated. The technique combines the submicron spatial resolution of near-field optics with tunable laser excitation, allowing for selective investigation of the waveguide properties of the device structure. Experiments on InGaAs/AlGaAs high-power laser diodes with different waveguide designs provide direct visualization of the effect of the waveguide design on (i) the number of guided modes and (ii) the spatial profile of both fundamental and higher-order modes. The technique thus provides a sensitive tool for nondestructive in situ analysis of waveguide properties in optoelectronic devices. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1342206
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  • 4
    Electronic Resource
    Electronic Resource
    Sequence diversity of Mhc genes in lake whitefish (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The sequence variation of three exons of the major histocompatibility complex (Mhc) was examined in a lake whitefish Coregonus sp., population from the Swiss lake of Hallwil. DNA sequences from the Mhc class I A1, A2 and class II B1 exons, corresponding to the α1, α2 and β1 domains of the Mhc glycoproteins, were obtained by the polymerase chain reaction followed by cloning and sequencing. The numbers of variable sequences detected for each exon were 15 (A1), 11 (A2) and 20 (B1). Levels of nucleotide similarity ranged from 82 to 99% for the A1 exon, 58–96% for the A2 and 88–99% for the B1 exon. At the A1 and B1 exons, the nonsynonymous substitution rates (dn) exceeded synonymous substitution rates (ds) greatly within the peptide binding regions, indicating the effect of balancing selection. Sequence diversity at the A2 exon did not seem to be maintained by balancing selection (ds 〉 dn). Phylogenetic comparison of whitefish Mhc sequences with sequences from other salmonid species and more distantly related teleosts indicated shared ancestral (trans-species) polymorphism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb02258.x
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  • 5
    Electronic Resource
    Electronic Resource
    Increased Tyrosine Hydroxylase Activity after Drug-induced Alteration of Sympathetic Transmission (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 1264-1264 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sprague-Dawley male rats, 120-180 g, were obtained from Hormone Assay (Chicago, Illinois) and housed 72 h before use. The weights of control and treated animals were within a 20 g range at the start of each experiment. Animals were killed by a blow on the head and the adrenal glands were rapidly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2211264a0
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  • 6
    Electronic Resource
    Electronic Resource
    Cenozoic motion between East and West Antarctica (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 404 (2000), S. 145-150 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The West Antarctic rift system is the result of late Mesozoic and Cenozoic extension between East and West Antarctica, and represents one of the largest active continental rift systems on Earth. But the timing and magnitude of the plate motions leading to the development of this rift system ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35004501
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  • 7
    Electronic Resource
    Electronic Resource
    Lipoide als zytochemisches Substrat der Bindungsorte basischer Vitalfarbstoffe in Blut-, Epithel- und Tumorzellen (1967)
    Springer
    Histochemistry and cell biology 10 (1967), S. 309-320 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die zytochemische Natur der Anreicherungsorte basischer Vitalfarbstoffe (Akridinorange, Nilblausulfat und Neutralrot) im Zytoplasma von Blutplättchen, Leukozyten, Mäuseaszites-Tumorzellen und Epithelzellen wurde untersucht. Dabei stellte sich heraus, daß bei allen untersuchten Zelltypen Phospholipoide oder Phospholipoproteide als Substrat der umschriebenen Farbstoffbindung in lysosomalen Zellstrukturen dienen. Die Supravitalfärbung mit basischen Farbstoffen ist demnach als zytochemischer Lipoidnachweis geeignet, wenn unter bestimmten Bedingungen und unter Einhaltung eines definierten Färbestadiums (Stadium der granulären oder vakuolären Farbstoffverteilung) beobachtet wird. Auf die methodischen Vorteile der Supravitalfärbung wird hingewiesen.
    Notes: Summary The cytochemical character of the substrat for basic vital dyes (acridine orange, nil blue sulfate, neutral red) has been studied in the cytoplasma of blood platelets, leucocytes, Ehrlich Ascites tumor cells and epithelial cells. It could be demonstrated that the vital dyes are bound to lysosomal phospholipids or phospholipoproteins in the different cell types. Supravital staining with basic dyes is therefore considered to be a useful method for identifying lipid material in cytology, provided defined conditions and stades of staining are observed. The advantages of the proposed method are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304313
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of the measuring position in laser-Doppler anemometry (2004)
    Springer
    Experiments in fluids 6 (2004), S. 105-110 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The present paper is concerned with the determination of the measuring position of a laser-Doppler anemometer (LDA) relative to a wall. The proposed method is based on the finding that the output of a hot-wire anemometer increases when the wire, which is mounted in quiescent air parallel to the wall, is brought closer than 800 μm to the wall. For given hot-wire anemometer parameters, the hot-wire anemometer output voltage depends on the wall material and the wire distance from the wall. After suitable calibration for the wall material of the test section, the anemometer reading in a test rig can be used to find the wire position. Moving the measuring volume of a LDA-system across the wire yields an output voltage variation of the LDA-photomultiplier showing a Gaussian shape. When the maximum output voltage is reached, the centre of the measuring control volume is located at the centre of the wire and, hence, the location of the LDA-measuring position is known. All position measurements for the LDA-system are then taken relative to this point using the scale of the LDA-traversing system. If optical effects of transparent test section walls are eliminated by employing refractive index matched liquids, there are other ways to find the measuring position of a laser-Doppler anemometer relative to a wall. One such method and its application to the study of the turbulent near wall flow in a pipe is described in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196460
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of an ethylene receptor family with differential expression in rose (Rosa hybrida L.) flowers (2000)
    Springer
    Plant cell reports 19 (2000), S. 1232-1239 
    Details
    ISSN: 1432-203X
    Keywords: Keywords Abscisic acid ; Ethylene ; ETR homologues ; Flower senescence ; Rosa hybrida ; Abbreviations ABA Abscisic acid ; DIG Digoxigenin ; SSC Standard saline citrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  To analyze differences in flower longevity and ethylene sensitivity, we isolated Rosa hybrida gene fragments with sequence similarity to the Arabidopsis thaliana ethylene receptor gene-family. A rose gene (RhETR1) highly similar to AtERS1 had been previously sequenced. Here, we report the isolation of three additional partial rose genes (RhETR2–4) belonging to different sub-groups of ethylene receptor genes. RhETR2 clusters with AtETR1, RhETR4 with AtERS1 and RhETR1, whereas RhETR3 shows high sequence similarity to AtETR2 and AtERS2. Expression analysis of RhETR2 and RhETR3 revealed that they are differentially expressed. RhETR2 is expressed at a constitutive level throughout flower development whereas RhETR3 expression increases in senescing flowers of the cultivar Bronze which has a short floral life while it remains at low levels in the long-lasting flowers of the cultivar Vanilla. Expression of both genes was increased by ABA and ethylene treatment, but transcript abundance differed between rose cultivars with different postharvest performance. These results indicate that differences in flower life among rose cultivars could be due to differences in receptor levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990000251
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of the Sol-Gel Processing on the Fluorescence Properties of Laser Dyes in Tetraethoxysilane Derived Matrices (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 799-802 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; precursor chemistry ; fluorescence properties ; optical solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Two fluorescent dyes were incorporated into sol-gel derived SiO2 matrices. The dye was added to SiO2 precursors of different degrees of pre-condensation and the spectroscopic properties of the immobilized dye were measured at various aging and drying stages of the resulting gels. The significant influence of the processing parameters on the spectroscopic properties is manifested in the relative intensity of a second red shifted emission band (550–560 nm), which was observed besides the typical coumarin emission band (495 nm). The appearance of this long wavelength emission might be attributed to dye aggregation or to other reactions with the ambient matrix forced by micro porosity phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008768318418
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