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  • 2000-2004  (153)
  • 1950-1954  (19)
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  • 1
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    Studies on Mercury Resistance in Yeasts Isolated from Natural Sources (2004)
    Springer
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0007-4861
    Electronic ISSN: 1432-0800
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Occurrence of a Trypanosome in Triatoma rubrofasciatus in Calcutta (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 35-35 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Of forty-five specimens collected from different parts of Calcutta and examined, thirty-six adult insects and nymphs harboured in their guts a large number of trypanosomes in various stages of development. For the purpose of observation each insect was treated in the following manner. The entire ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167035a0
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  • 3
    Electronic Resource
    Electronic Resource
    A new telemetry system for a balloon-borne far-infrared astronomical telescope (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 281-288 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new telemetry system (NTS) is described here, which has been developed for a balloon-borne far-infrared astronomical telescope. The NTS includes two space borne encoders (TEs) and the ground station decoder and display subsystems. The design of the TEs uses several novel ideas which simplify on-board hardware implementation. The NTS has shown satisfactory in-flight performance and is now a standard package for regular balloon flight experiments. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150194
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  • 4
    Electronic Resource
    Electronic Resource
    Optical parameters of a magnetized semiconductor plasma with nonparabolic band structure (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 4741-4746 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical parameters (linear and nonlinear) and dispersion characteristics of a III–V compound semiconductor plasma subjected to a strong transverse magnetic field have been investigated theoretically. The nonlinearity induced in the medium has been attributed to heating of the carriers by the pump that results in modification of the electron effective mass in a nonparabolic conduction band and the momentum transfer collision frequency of electrons. The external magnetic field is found to have two consequences: (a) increasing the nonlinearity of the medium and (b) modifying the dispersion characteristics and determining the direction of energy flow between the pump and the generated waves. The plasma frequency ωp is found to enhance the magnitude of the optical parameters as usual. For a typical n-InSb semiconductor, linear refractive index and nonlinear refractive index coefficients are found maximum (nl=5.3, nnl=2×10−10 m2 V−2) whereas absorption coefficients al (linear) and anl (nonlinear) are found to vanish when ωo resonates with ωc(=1.138×1014 s−1). The present study once again establishes the device potentials of n-InSb. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358315
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  • 5
    Electronic Resource
    Electronic Resource
    Plasmid curing from an acidophilic bacterium of the genus Acidocella (2000)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 183 (2000), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Preservation of the acidophilic heterotroph, Acidocella sp. strain GS19h, at 4°C in stab culture eliminated all indigenous plasmids from this bacterium. Growth at 42°C initially caused changes in the plasmid profile followed by total elimination of plasmids after 10 cycles of growth. Concomitant to this loss of all plasmids, the cured derivatives became sensitive to CdSO4 and ZnSO4, and the MIC value of the salts dropped from 1 M for each in the case of parental strain to 2 mM and 5 mM, respectively, suggesting plasmid-mediated inheritance of metal resistance in this bacterium. The cured derivatives could not utilise lactose, indicating this metabolic activity to be plasmid-associated in this strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.2000.tb08970.x
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  • 6
    Electronic Resource
    Electronic Resource
    Entangled quantum state of magnetic dipoles (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 425 (2003), S. 48-51 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Free magnetic moments usually manifest themselves in Curie laws, where weak external magnetic fields produce magnetizations that vary as the reciprocal of the temperature (1/T). For a variety of materials that do not display static magnetism, including doped semiconductors and certain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01888
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  • 7
    Electronic Resource
    Electronic Resource
    Cation-Exchange Studies with the Colloidal Clay Salts of Silver. (1950)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 54 (1950), S. 1110-1121 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150482a004
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  • 8
    Electronic Resource
    Electronic Resource
    Optical parameters of a magnetized space-charge neutral group IV semiconductor (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4910-4916 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a hydrodynamic model of semiconductor plasmas, we report an analytical investigation of hot-carrier induced nonlinearity and its impact on the optical parameters (refractive index and absorption coefficient) of a magnetized, space-charge neutral group IV semiconductor. The carrier heating by the pump is assumed to induce nonlinearity in the medium through momentum transfer collision frequency ν of the carriers and space-charge neutrality of the medium. For the linear optical parameters (nl, al), both electrons and holes are found to contribute resonantly at high frequency of the pump (ω0(approximate)ωce). For the nonlinear optical parameters (n2, a2), the holes contribute significantly in the low pump frequency regime (ω0(approximate)ωch,) whereas in the high pump frequency regime (ω0(approximate)ωce), both kinds of carriers contribute resonantly in which a much larger contribution comes from the electrons. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456245
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  • 9
    Electronic Resource
    Electronic Resource
    Surface-emitting spin-polarized In0.4Ga0.6As/GaAs quantum-dot light-emitting diode (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 658-660 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the properties of a spin-polarized In0.4Ga0.6As/GaAs quantum-dot surface-light-emitting diode with a Ga0.974Mn0.026As spin injector layer. Spin-polarized holes from this ferromagnetic layer recombine with electrons in the quantum dots to produce circularly polarized light output. The peak optical polarization efficiency at 5.1 K is 18% and the spin injection efficiency is estimated to be ∼36%. The temperature dependence of spin injection is almost identical to the temperature dependence of magnetization in the (Ga, Mn)As layer. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1436526
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature-dependent measurement of Auger recombination in self-organized In0.4Ga0.6As/GaAs quantum dots (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 722-724 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report experimental studies of temperature-dependent Auger recombination coefficients in self-assembled quantum dots. The results are based on a study of temperature-dependent large signal modulation experiments made on self-organized In0.4Ga0.6As/GaAs quantum dot lasers. The Auger coefficient decreases from ∼8×10−29 cm6/s at 100 K to ∼4×10−29 cm6/s at 300 K. This behavior, which is different from results in other higher-dimensional systems, is explained in terms of the temperature dependence of electron-hole scattering in the dots and contribution from higher lying states in the dot and adjoining layers. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1391401
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