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  • 1
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    Phonon-assisted lasing in ZnO microwires at room temperature (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-11-27
    Description: We report on room temperature phonon-assisted whispering gallery mode (WGM) lasing in ZnO microwires. For WGM laser action on the basis of the low gain phonon scattering process high quality resonators with sharp corners and smooth facets are prerequisite. Above the excitation threshold power P Th of typically 100 kW/cm 2 , the recombination of free excitons under emission of two longitudinal optical phonons provides sufficient gain to overcome all losses in the microresonator and to result in laser oscillation. This threshold behavior is accompanied by a distinct change of the far and near field emission patterns, revealing the WGM related nature of the lasing modes. The spectral evolution as well as the characteristic behavior of the integrated photoluminescence intensity versus the excitation power unambiguously proves laser operation. Polarization-resolved measurements show that the laser emission is linear polarized perpendicular to the microwire axis (TE).
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Cellular transcription factors and regulation of IL-2 receptor gene expression by HTLV-I tax gene product (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-07-01
    Description: Expression of the interleukin-2 receptor (IL-2R alpha) gene is activated by the transcriptional activator protein, Tax (previously referred to as the tat gene product), encoded by the human T-cell leukemia virus (HTLV-I). Multiple protein binding sites for specific DNA-protein interactions were identified over the upstream IL-2R alpha transcriptional regulatory sequences. However, only one region, which includes the sequence motif GGGGAATCTCCC, was required for activation by both the tax gene product and mitogenic stimulation. Remarkably, this sequence also bound the nuclear factor NF kappa B, which is important for induction of kappa-immunoglobulin gene expression. A model is presented whereby regulation of cellular gene expression by the HTLV-I tax gene product occurs via an indirect mechanism that may involve a post-translational modification of preexistent cellular transcription factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ruben, S -- Poteat, H -- Tan, T H -- Kawakami, K -- Roeder, R -- Haseltine, W -- Rosen, C A -- New York, N.Y. -- Science. 1988 Jul 1;241(4861):89-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology, Roche Institute of Molecular Biology, Nutley, NJ 07110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2838905" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Cell Line ; DNA/genetics/metabolism ; Deltaretrovirus/*genetics ; Gene Expression Regulation/*drug effects ; Gene Products, tat ; Immunoglobulin kappa-Chains/genetics ; Mutation ; Plasmids ; Promoter Regions, Genetic ; Receptors, Immunologic/*genetics ; Receptors, Interleukin-2 ; Regulatory Sequences, Nucleic Acid ; Transcription Factors/genetics/metabolism/*pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics (1993)
    Springer
    Journal of geodesy 67 (1993), S. 71-80 
    Details
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In addition to the on-line data evaluation during the measurements with the absolute gravity meter JILAG-3, a subsequently more intensive examination of the measured time/distance data pairs is performed. This allows an additional assessment of the gravity results, the station quality and the measurement conditions. Sinusoidal disturbances in the raw data deteriorate the determination of gravity. Incoming microseisms affect the mean result of the free-fall experiments randomly after a large number of measurements. Instrumental vibrations of the gravity meter during the measurement procedure may influence the gravity result systematically. A station comparison indicates that a 30 Hz frequency is triggered by JILAG-3 itself and influences the measurements depending on the stability of the foundation. Using a mathematical filter it is possible to separate the deteriorations from the gravity acceleration. Up to now an improvement in the absolute accuracy of gravity after filtering could not be proved, but an increase of the precision is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01371370
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  • 4
    Electronic Resource
    Electronic Resource
    Red-shifts and Power Outputs of Quasi-stellar Radio Sources (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 165-166 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table i. LIST OF RADIO GALAXIES FROM THE SCR CATALOGUE WITH KNOWN RED-SHIFTS 3C17 28 33 40 66 71 75 78 79 3C88 98 171 192 198 219 223 223-1 234 3C264 270 277-3 287-1 293 295 296 305 310 3(7315 317 327 338 348 353 371 382 3(7390-3 433 436 442 445 452 456 459 465 Fig. 1 shows log z ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212165a0
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  • 5
    Electronic Resource
    Electronic Resource
    Biochemistry and Structural Biology of Transcription Factor IID (TFIID) (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 65 (1996), S. 769-799 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.65.070196.004005
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  • 6
    Electronic Resource
    Electronic Resource
    ASTRONOMICAL EDUCATION AND MANPOWER IN CANADA (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 198 (1972), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1972.tb12704.x
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  • 7
    Electronic Resource
    Electronic Resource
    IUE observations of extragalactic objects (1978)
    [s.l.] : Nature Publishing Group
    Nature 275 (1978), S. 404-414 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the commissioning high priority target phase of IUE several classes of extragalactic object were observed at low dispersion with both the short- and long-wavelength cameras. Although the instrument was not fully optimised, scientifically useful spectra were obtained for the Seyfert galaxies ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/275404a0
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  • 8
    Electronic Resource
    Electronic Resource
    The present appearance of white holes (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 449-450 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Previous discussions of the optical appearance of white holes have been concerned with the analysis of only radial null geodesies and have assumed that radiation from white holes is strongly blueshifted2'3. We find that radiation from the white holes mentioned above is strongly blueshifted for only ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273449a0
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  • 9
    Electronic Resource
    Electronic Resource
    Clusters of galaxies as gravitational lenses? (1976)
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 764-765 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider a source of radiation at a distance Lcz/H0 from the observer, in a universe which is homogeneous on some sufficiently large scale, with mean density ru. The line of sight to the source may, however, be such that the mean density along the beam of light, 〈r〉, differs from ru. The cross ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/260764a0
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  • 10
    Electronic Resource
    Electronic Resource
    Significance of the angular diameter-redshift relation (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 124-125 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observational relations in the standard, homogeneous Friedmann models (HFM) have been generalised by Dyer and Roeder2 to take into account the fact that the Universe may be quite inhomogeneous on the scale of galaxies and clusters of galaxies. The inhomogeneities are put into the models ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/255124a0
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