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  • 1995-1999  (163)
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  • 1
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    Crystal structure of DNA photolyase from Escherichia coli (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-06-30
    Description: Photolyase repairs ultraviolet (UV) damage to DNA by splitting the cyclobutane ring of the major UV photoproduct, the cis, syn-cyclobutane pyrimidine dimer (Pyr 〈〉 Pyr). The reaction is initiated by blue light and proceeds through long-range energy transfer, single electron transfer, and enzyme catalysis by a radical mechanism. The three-dimensional crystallographic structure of DNA photolyase from Escherichia coli is presented and the atomic model was refined to an R value of 0.172 at 2.3 A resolution. The polypeptide chain of 471 amino acids is folded into an amino-terminal alpha/beta domain resembling dinucleotide binding domains and a carboxyl-terminal helical domain; a loop of 72 residues connects the domains. The light-harvesting cofactor 5,10-methenyltetrahydrofolylpolyglutamate (MTHF) binds in a cleft between the two domains. Energy transfer from MTHF to the catalytic cofactor flavin adenine dinucleotide (FAD) occurs over a distance of 16.8 A. The FAD adopts a U-shaped conformation between two helix clusters in the center of the helical domain and is accessible through a hole in the surface of this domain. Dimensions and polarity of the hole match those of a Pyr 〈〉 Pyr dinucleotide, suggesting that the Pyr 〈〉 Pyr "flips out" of the helix to fit into this hole, and that electron transfer between the flavin and the Pyr 〈〉 Pyr occurs over van der Waals contact distance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Park, H W -- Kim, S T -- Sancar, A -- Deisenhofer, J -- GM31082/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1995 Jun 30;268(5219):1866-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7604260" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Computer Graphics ; Crystallography, X-Ray ; DNA Damage ; DNA Repair ; DNA, Bacterial/metabolism ; Deoxyribodipyrimidine Photo-Lyase/*chemistry/metabolism ; Electron Transport ; Escherichia coli/*enzymology ; Flavin-Adenine Dinucleotide/metabolism ; Folic Acid/analogs & derivatives/metabolism ; Hydrogen Bonding ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Pyrimidine Dimers/metabolism
    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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    Persistent Organochlorines in the Effluents from a Chlorine-Bleached Kraft Integrated Pulp and Paper Mill in Southeast Asia (1999)
    Springer
    Details
    Publication Date: 1999-10-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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  • 3
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    Efficient recruitment of TFIIB and CBP-RNA polymerase II holoenzyme by an interferon-  enhanceosome in vitro (1998)
    National Academy of Sciences
    Details
    Publication Date: 1998-10-13
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Litter Reduction: A Review and Integration of the Literature (1995)
    Beverly Hills, Calif. : Periodicals Archive Online (PAO)
    Environment and behavior. 27:2 (1995:Mar.) 153 
    Details
    ISSN: 0013-9165
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Psychology
    Notes: Special Issue: Litter Control and Recycling
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:f117-1995-027-02-000003
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  • 5
    Electronic Resource
    Electronic Resource
    Dispersion of Faraday rotation in Co/SiO2 multilayer films (1996)
    Springer
    JETP letters 63 (1996), S. 273-277 
    Details
    ISSN: 1090-6487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Faraday rotation spectra of Co/SiO2 multilayer films were found to be substantially different from the well-known spectra of homogeneous Co films. The character of these changes was studied as a function of the thicknesses of the ferromagnetic metal and the nonmagnetic dielectric layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567015
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  • 6
    Electronic Resource
    Electronic Resource
    The formation of stable Co/Co2MnSn two phase magnets : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5253-5255 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The phase equilibria in the system Co–Mn–Sn have been studied with compositions along the join Co–CoMnSn. This is part of an effort to form a macroscopic ferrimagnet with two metallic ferromagnetic phases, Co and Co2MnSn. As-cast arc melted alloys have been made with Co compositions from 33 to 78 at. %. Three different phase and magnetization regions are observed with increasing Co composition. Cobalt becomes the primary phase at more than 71 at. % Co and crystallizes out of a Co2MnSn rich matrix. It is shown from x-ray diffraction analysis and the Tc change with Co compositions that the Co phase in Co2MnSn matrix is probably a Co–Mn solid solution. From the break in the magnetization vs temperature curves of two phase magnets with two different compositions, Curie temperatures are determined as approximately 160 °C and 175 °C for the Co–Mn solid solution phase. The exchange coupling at phase boundary is proposed by the analysis of coercivity vs temperature data. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361302
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  • 7
    Electronic Resource
    Electronic Resource
    Enhancement of the interband Stark effects in strained CdxZn1−xTe/ZnTe coupled double quantum wells (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1550-1552 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of an electric field on the interband transitions in CdxZn1−xTe/ZnTe coupled double quantum wells have been investigated both experimentally and theoretically. Photoluminescence (PL) measurements have been performed to investigate the excitonic transitions in CdxZn1−xTe/ZnTe coupled double quantum wells. Transmission electron microscopy images show that a 35-Å Cd0.18Zn0.82Te quantum well and a 50-Å Cd0.18Zn0.82Te quantum well are separated by a 35-Å Cd0.1Zn0.9Te potential barrier. PL spectra at 300 K show the excitonic transitions. When an electric field is applied to a coupled double quantum well, the Stark shift of the interband transition energy in the CdxZn1−xTe/ZnTe coupled double quantum wells is much more sensitive to the applied electric field than that of the Cd0.1Zn0.9Te/ZnTe single quantum wells. The electronic subband energies and energy wave functions in the quantum wells are calculated by an envelope function approximation, which takes into account the strain effects. These results indicate that CdxZn1−xTe/ZnTe coupled double quantum wells hold promise for potential applications in optoelectronic devices, such as new types of modulators and tunable lasers. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122202
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  • 8
    Electronic Resource
    Electronic Resource
    Strain effects in lattice-mismatched InxGa1−xAs/InyAl1−yAs coupled double quantum wells (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 61-63 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transmission electron microscopy (TEM) and Raman scattering spectroscopy measurements were performed to investigate strain effects in lattice-mismatched InxGa1−xAs/InyAl1−yAs modulation-doped coupled double quantum wells. The high-resolution TEM images showed that a 100-Å In0.8Ga0.2As deep quantum well and a 100-Å In0.53Ga0.47As shallow quantum well were separated by a 30-Å In0.25Ga0.75As embedded potential barrier. The selected-area electron-diffraction pattern obtained from TEM measurements on the InxGa1−xAs/InyAl1−yAs double quantum well showed that the InxGa1−xAs active layers were grown pseudomorphologically on the InP buffer layer. The values of the strain and the stress of the InxGa1−xAs layers were determined from the electron-diffraction pattern. Based on the TEM results, a possible crystal structure for the InxGa1−xAs/InyAl1−yAs coupled double quantum well is presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121723
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  • 9
    Electronic Resource
    Electronic Resource
    Interband transition studies on CdxZn1−xTe/ZnTe step quantum wells under applied electric fields (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 563-565 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence (PL) measurements were carried out to investigate the interband transitions in CdxZn1−xTe/ZnTe asymmetric step quantum wells with and without an applied electric field. Transmission electron microscopy showed that the CdxZn1−xTe/ZnTe step quantum wells consisted of a shallow Cd0.1Zn0.9Te well and a deep Cd0.18Zn0.82Te well bound by two thick ZnTe barriers. The results for the PL data at 300 K for several applied electric fields showed that the excitonic transition from the first electronic state to the first heavy-hole state shifted to the larger energy side as the applied electric field increased. The electronic subband energies and the wave functions in the step quantum wells were calculated by an envelope-function approximation method, taking into account the strain effects, and the calculated values of the interband transitions were in qualitative agreement with those obtained from the PL measurements. The Stark shift of the step quantum well was much more sensitive to the applied electric field than that of the single quantum well. These results indicate that CdxZn1−xTe/ZnTe step quantum wells hold promise for potential applications such as new types of modulators and quantum-well infrared photodetectors in the blue–green region of the spectrum. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120760
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  • 10
    Electronic Resource
    Electronic Resource
    Photoluminescence and photoreflectance from GaAs/AlAs multiple quantum wells (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3376-3379 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence (PL) and photoreflectance (PR) measurements have been performed to investigate the intermixing behavior of Al and Ga in GaAs/AlAs multiple quantum wells (MQWs) grown by molecular-beam epitaxy and treated by rapid thermal annealing. These results indicate that the magnitude of the disordering for a GaAs/AlAs MQW increases as the layer thickness increases. When the GaAs/AlAs MQWs with layer thicknesses of 34 A(ring) are annealed at 950 °C for 10 s, the GaAs/AlAs MQWs are totally intermixed, resulting in a formation of an Al0.45Ga0.55As alloy. For the intermixed GaAs/AlAs MQWs, PL spectra show dominantly the Γ-valley direct transition, and PR signals show that the peaks originating from the interband transitions disappear. The observed increases of the full width at half-maximum (FWHM) in the PL spectra for the annealed GaAs/AlAs MQWs originate from the nonuniformity of the intermixing as a function of depth, and the decrease of FWHM in the PL spectra for the GaAs/AlAs MQWs annealed for longer times is due to the formation of Al0.45Ga0.55As alloys in the GaAs/AlAs MQWs. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359965
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