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  • 2020-2024  (10)
  • 2020-2023  (2)
  • 2020-2022  (93)
  • 1995-1999  (155)
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  • 1
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    Degradation mechanism of small molecule-based organic light-emitting devices (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-03-19
    Description: Studies on the long-term degradation of organic light-emitting devices (OLEDs) based on tris(8-hydroxyquinoline) aluminum (AlQ3), the most widely used electroluminescent molecule, reveal that injection of holes in AlQ3 is the main cause of device degradation. The transport of holes into AlQ3 caused a decrease in its fluorescence quantum efficiency, thus showing that cationic AlQ3 species are unstable and that their degradation products are fluorescence quenchers. These findings explain the success of different approaches to stabilizing OLEDs, such as doping of the hole transport layer, introducing a buffer layer at the hole-injecting contact, and using mixed emitting layers of hole and electron transporting molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aziz -- Popovic -- Hu -- Hor -- Xu -- New York, N.Y. -- Science. 1999 Mar 19;283(5409):1900-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario, Canada. Xerox Research Centre of Canada, Mississauga, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10082460" target="_blank"〉PubMed〈/a〉
    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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  • 2
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    Human DNA-(cytosine-5) methyltransferase-PCNA complex as a target for p21WAF1 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-09-26
    Description: DNA-(cytosine-5) methyltransferase (MCMT) methylates newly replicated mammalian DNA, but the factors regulating this activity are unknown. Here, MCMT is shown to bind proliferating cell nuclear antigen (PCNA), an auxiliary factor for DNA replication and repair. Binding of PCNA requires amino acids 163 to 174 of MCMT, occurs in intact cells at foci of newly replicated DNA, and does not alter MCMT activity. A peptide derived from the cell cycle regulator p21(WAF1) can disrupt the MCMT-PCNA interaction, which suggests that p21(WAF1) may regulate methylation by blocking access of MCMT to PCNA. MCMT and p21(WAF1) may be linked in a regulatory pathway, because the extents of their expression are inversely related in both SV40-transformed and nontransformed cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chuang, L S -- Ian, H I -- Koh, T W -- Ng, H H -- Xu, G -- Li, B F -- New York, N.Y. -- Science. 1997 Sep 26;277(5334):1996-2000.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Chemical Carcinogenesis Laboratory, Institute of Molecular and Cell Biology, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Republic of Singapore.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9302295" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cell Line, Transformed ; Cell Nucleus/metabolism ; Cyclin-Dependent Kinase Inhibitor p21 ; Cyclins/chemistry/*metabolism ; DNA (Cytosine-5-)-Methyltransferase/*metabolism ; DNA Damage ; *DNA Methylation ; DNA Repair ; DNA Replication ; Humans ; Molecular Sequence Data ; Peptides/pharmacology ; Proliferating Cell Nuclear Antigen/*metabolism ; Recombinant Fusion Proteins/metabolism/pharmacology ; Tumor Cells, Cultured
    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
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    Abstract: Steep and Gentle Slope Depositional Systems in Lacustrine Rift Basins - A Case study of the Huagou Sag in the Bohai Bay Basin: Facies Composition and Geological Controls  (1999)
    American Association of Petroleum Geologists
    Details
    Publication Date: 1999-01-01
    Print ISSN: 0149-1423
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by American Association of Petroleum Geologists
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  • 4
    Electronic Resource
    Electronic Resource
    Broadband optical limiting with multiwalled carbon nanotubes (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3632-3634 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical limiting effects in multiwalled carbon nanotubes have been observed in the visible and infrared spectral regions with nanosecond laser pulses. The multiwalled carbon nanotubes investigated include those suspended in distilled water and embedded in polymethyl methacrylate films. Among all the samples measured, the limiting performance of the carbon nanotube suspension is the best with the limiting threshold determined to be ∼1, 5, and 13 J/cm2 at 532, 700, and 1064 nm, respectively. The possible mechanism for the observed effects is discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122845
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  • 5
    Electronic Resource
    Electronic Resource
    High speed, low noise ultraviolet photodetectors based on GaN p-i-n and AlGaN(p)-GaN(i)-GaN(n)structures (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2154-2156 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the spectral response of front-surface-illuminated GaN and AlGaN/GaN p-i-n ultraviolet photodetectors prepared by reactive molecular beam epitaxy on sapphire substrates. GaN homojunction p-i-n photodiodes exhibited a peaked response near the band edge. This enhanced response was absent in the AlGaN/GaN heterojunction p-i-n detectors. We analyzed the effect of p-layer thickness of the GaN p-i-n diodes on the magnitude of the peak photoresponse. The AlGaN/GaN photodiodes had a maximum zero-bias responsivity of 0.12 A/W at 364 nm, which decreased by more than 3 orders of magnitude for wavelengths longer than 390 nm. A reverse bias of −10 V raised the responsivity to 0.15 A/W without any significant increase in noise. The root-mean-square noise current in a 1 Hz bandwidth is ∼1.0 pA, corresponding to a noise-equivalent-power of ∼8.3 pW. We measured extremely fast decay times of 12 ns for the AlGaN/GaN and 29 ns for the GaN photodiodes. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119366
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  • 6
    Electronic Resource
    Electronic Resource
    Atomic resolution x-ray hologram (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1901-1903 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Unlike crystals producing sharp peaks under the x-ray diffraction, disordered materials show slowly varying patterns presenting little structural information. This is due to the fact that only the scattering intensity can be recorded, and the loss of the phase information makes the Fourier inversion of the amplitude impossible. However, when an amorphous sample is placed on a crystal, the x-ray intensity diffracted by the assembly can produce a hologram which contains the spatial modulation of both density functions. Therefore, with known crystal structure the electron density of the amorphous specimen can be resolved by holographic technique. Moreover, it is found that only the amorphous scattering data are needed, and the Bragg peak(s) can be dropped. This gives the scheme the same noise tolerance as by the ordinary amorphous diffraction. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116288
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  • 7
    Electronic Resource
    Electronic Resource
    Raman scattering and photoluminescence of Mg-doped GaN films grown by molecular beam epitaxy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4020-4023 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence, Raman, and Hall measurements are reported for Mg doped GaN films grown by molecular beam epitaxy. The compressive and tensile stress determined by the Raman shift of the phonon lines is due to the growth conditions rather than the presence of Mg in the film. The photoluminescence peak of near band-to-band transitions is also shifted to larger (smaller) energies by the compressive (tensile) stress. The study of the longitudinal optical phonon of the A1 branch shows that its Raman line shape is affected mostly by the crystalline quality of the film. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365711
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  • 8
    Electronic Resource
    Electronic Resource
    Possible intermediate in H2S dissociation on GaAs(100) (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2793-2795 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The adsorption and dissociation of H2S on GaAs(100) has been studied using high-resolution electron energy loss spectroscopy, thermal desorption spectroscopy, and isotope exchange techniques. The dissociative adsorption of H2S at 100 K produces only H–As species with a vibrational frequency of 2072 cm−1. Upon warming to 200 K, the vibration of H–As clearly shifts to 2105 cm−1, corresponding to a free H–As species. In addition, the formation of H–Ga (1887 cm−1) is also observed upon thermal annealing. In coadsorption studies of H2S and D atoms, three main desorption features of H2S were observed at 135, 200, and 375 K, respectively. The peaks at 135 and 375 K can be attributed to the desorption of molecularly adsorbed H2S and the recombinative desorption of adsorbed H and HS, respectively. In addition to the 375 K peak, the desorption feature at 200 K also undergoes isotope exchange between coadsorbed D atoms and H2S. These observations strongly suggest that the dissociative adsorption of H2S on GaAs(100) involves an intermediate of Ga–HS—H–As. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122559
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  • 9
    Electronic Resource
    Electronic Resource
    Analysing extensive fish culture systems by transparent population modelling: bighead carp, Aristichthys nobilis (Richardson 1845), culture in a Chinese reservoir (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 28 (1997), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A transparent population modelling approach is used to analyse a large-scale extensive fish culture system, the bighead carp, Aristichthys nobilis (Richardson 1845), fishery in a Chinese reservoir. The population model incorporates explicit submodels for density-dependent growth and size-dependent mortality, and allows the assessment of stocking density, seed fish size, fishing mortality (fishing effort), and gear selectivity. The process of model building and parameter estimation from stocking and catch data is described in detail. The full analysis is carried out in computer spreadsheets where all model components are visible and can easily be modified to take account of specific conditions, or to explore different assumptions. The practical use of the model in management decision making is discussed, together with data requirements and the possible need for experimental management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2109.1997.00911.x
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  • 10
    Electronic Resource
    Electronic Resource
    catena-Poly[[diaqua(3-cyanobenzoato-O,O')erbium]-bis-μ-(3-cyanobenzoato-O:O')] (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 1420-1422 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199007696
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