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  • 1
    Electronic Resource
    Electronic Resource
    Shape control of CdSe nanocrystals (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 404 (2000), S. 59-61 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nanometre-size inorganic dots, tubes and wires exhibit a wide range of electrical and optical properties that depend sensitively on both size and shape, and are of both fundamental and technological interest. In contrast to the syntheses of zero-dimensional systems, existing preparations ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35003535
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of the shape of self-organized InAs/GaAs quantum dots by reflection high energy electron diffraction (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 812-814 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a reflection high energy electron diffraction study of InAs self-organized quantum dots grown on GaAs (001). We observe facet reflections along the [31¯0] and [13¯0] azimuths, which indicate that the quantum dot shape is pyramidal with bounding facets corresponding to a family of four {136} planes. The determined structure, which possesses C2v symmetry, is quite different both from square-base pyramidal geometries which have been assumed in recent electronic structure calculations, and from previously proposed structures which have been based upon incomplete reflection high energy electron diffraction data. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120901
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  • 3
    Electronic Resource
    Electronic Resource
    Photoluminescence study of in situ annealed InAs quantum dots: Double-peak emission associated with bimodal size distribution (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3556-3558 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a photoluminescence study of self-assembled InAs islands subjected to in situ annealing prior to the growth of a capping layer. A distinctive double-peak feature is observed in the photoluminescence spectra of annealed samples. The power dependence of the photoluminescence spectra reveals that the double-peak emission is associated with the ground-state transition of islands in two different size branches. This observation agrees with a previous study, which demonstrated that the InAs island size distribution bifurcates during post-growth annealing. The temperature dependence of the photoluminescence intensities from samples with bimodal island size distributions illustrates that different thermal activation energies for carrier emission are associated with islands in different size branches. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122805
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of InAs/GaAs quantum dots by molecular beam epitaxy: Reversibility of the islanding transition (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2325-2327 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a study of the dynamics of coherent island formation in InAs/GaAs films grown by molecular beam epitaxy. A comparison of the temperature dependence of the critical layer thickness for islanding between the migration-enhanced and the continuous growth modes confirms that surface adatom diffusion and indium desorption are the controlling processes which determine the variation of the measured critical layer thickness with temperature. We find that under conditions in which indium desorption is significant, the islanding transition is reversible, which provides a new way to study the dynamics of the islanding transition. Applying this technique, we find that the size distribution of the three-dimensional islands evolves into a bimodal distribution during the reverse process. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120062
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  • 5
    Electronic Resource
    Electronic Resource
    Correlation between photoluminescence and infrared absorption spectra of oxidized nanoscale silicon clusters (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 2815-2819 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report in situ photoluminescence and ex situ Fourier transform infrared spectra of nanoscale silicon clusters exposed to atomic hydrogen, molecular oxygen, and humidified argon. Comparisons between infrared absorption spectra of fresh and aged samples indicate that photoluminescence efficiency is correlated with a stoichiometric oxide shell and the presence of Si dangling bond passivants at the core/oxide interface. Photoluminescence quenching is demonstrated in efficiently luminescing samples upon exposure to atomic hydrogen with recovery of photoluminescence occurring upon subsequent exposure to air. The photoluminescence quenching and recovery is correlated with a partial quenching and recovery of absorption due to interfacial silane groups. The correlations between photoluminescence and infrared absorption spectra, together with the hydrogen quenching results, provide evidence that radiative recombination in these samples is associated with interfacial oxide-related defects. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367041
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  • 6
    Electronic Resource
    Electronic Resource
    Visible electroluminescence from porous silicon/hydrogenated amorphous silicon pn-heterojunction devices (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 684-686 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the fabrication and characterization of a p-type porous silicon/ n-type hydrogenated amorphous silicon (a-Si:H) pn-heterojunction electroluminescent device structure. The devices exhibit electroluminescence in forward bias, demonstrating minority carrier injection from n-type a-Si:H into p-type porous silicon. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116591
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  • 7
    Electronic Resource
    Electronic Resource
    Modulation of microRNA processing and expression through RNA editing by ADAR deaminases (2006)
    [s.l.] : Nature Publishing Group
    Nature structural & molecular biology 13 (2006), S. 13-21 
    Details
    ISSN: 1545-9985
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Adenosine deaminases acting on RNA (ADARs) are involved in editing of adenosine residues to inosine in double-stranded RNA (dsRNA). Although this editing recodes and alters functions of several mammalian genes, its most common targets are noncoding repeat sequences, indicating the involvement of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nsmb1041
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  • 8
    Electronic Resource
    Electronic Resource
    Complexation and Electronic Spectra of Neodymium(III)–Amino Acid–1,10-Phenanthroline Systems in Aqueous Solution (1997)
    Springer
    Journal of solution chemistry 26 (1997), S. 105-112 
    Details
    ISSN: 1572-8927
    Keywords: Neodymium Complexation ; glutamic acid complex ; aspartic acid complex ; phenanthroline ternary complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Complexation of neodymium(III)–glutamate(glu)–phenanthroline(phen), neodymium(III)–aspartate(asp)–phenamhroline(phen) ternary systems and the corresponding binary systems in aqueous solution are discussed at various values of pH. Based on change regularity of hypersensitive transition intensities, the neodymium(III)–aspartate–phenanthroline ternary complex has a general formula of Nd(asp)3phen, but the composition of the complex of Nd(III) with glutamate and phenanthroline is complicated and has not been determined. The electronic spectra of these complexes were studied, Slater-Condon parameters Fks and the Lande parameter ξ 4f were obtained. The rms deviation between calculated and observed energy levels is less than 43 cm−1. Bonding in these complexes are also investigated and bonding parameters calculated. The results show that Nd(III) and amino acids form complexes by ionic linkage with carboxylic oxygens, but with some weak covalency. Besides, the degrees of covalency in ternary complexes are larger than those in binary complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1024493230082
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  • 9
    Electronic Resource
    Electronic Resource
    Complexation and electronic spectra of neodymium(III)-amino acid-1,10-phenanthroline systems in aqueous solution (1997)
    Springer
    Journal of solution chemistry 26 (1997), S. 105-112 
    Details
    ISSN: 1572-8927
    Keywords: Neodymium complexation ; glutamic acid complex ; aspartic acid complex ; phenanthroline ternary complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Complexation of neodymium(III)-glutamate(glu)-phenanthroline(phen), neodymium(III)-aspartate(asp)-phenanthroline(phen) ternary systems and the corresponding binary systems in aqueous solution are discussed at various values of pH. Based on change regularity of hypersensitive transition intensities, the neodymium(III)-aspartate-phenanthroline ternary complex has a general formula of Nd(asp)3phen, but the composition of the complex of Nd(III) with glutamate and phenanthroline is complicated and has not been determined. The electronic spectra of these complexes were studied, Slater-Condon parametersF k s and the Lande parameter ξ4f were obtained. The rms deviation between calculated and observed energy levels is less than 43 cm−1. Bonding in these complexes are also investigated and bonding parameters calculated. The results show that Nd(III) and amino acids form complexes by ionic linkage with carboxylic oxygens, but with some weak covalency. Besides, the degrees of covalency in ternary complexes are larger than those in binary complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02439447
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of an HMG-like protein involved in regulation of Na+/H+ exchanger expression (1997)
    Springer
    Molecular and cellular biochemistry 176 (1997), S. 99-106 
    Details
    ISSN: 1573-4919
    Keywords: Na+/H+ exchanger ; NHE1 ; promoter ; pH regulation ; high mobility group (HMG) protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract In this study we characterized regulation of the Na+/H+ exchanger promoter in several tissue types. A conserved poly (dA:dT) region was important in regulation of the promoter. Nuclear extracts from rat myocardium and from mouse proximal tubule cells protected the poly (dA:dT) region of the NHE1 promoter. A protein from nuclear extracts also bound to the poly (dA:dT) element in gel mobility shift binding assays. The binding was specific and was removed by mutations in the poly (dA:dT) region. Characterization of the binding to the poly (dA:dT) region in gel mobility shift assays showed that it was reduced by high concentrations of the divalent cations Mg++ and Mn++. The inhibition by divalent cations was reduced by decreasing the pH of the binding assay. N-terminal sequencing of the poly (dA:dT) binding protein showed that it was a member of the HMG (high mobility group) family of nuclear proteins which are important in cell growth and proliferation. The results are the first direct detection of a protein that regulates the NHE1 promoter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006831113403
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