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  • 1
    Electronic Resource
    Electronic Resource
    Absence of immunosuppression in DBA/2 mice vaccinated withTrypanosoma cruzi treated with actinomycin-D (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 1131-1133 
    Details
    ISSN: 1420-9071
    Keywords: T. cruzi ; immunology ; T. cruzi vaccination ; DBA/2 ; actinomycin-D ; immunosuppression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The subcutaneous (s.c.) vaccination of DBA/2 mice with 4 weekly doses of 3×107 living metacyclic forms ofT. cruzi, Y strain, obtained from culture in axenic medium and treated for 24 h with actinomycin-D (50 μg/107 parasites), a drug that promotes an irreversible blockade of the parasite replication, do not induce any detectable degree of humoral and cellular immunosuppression as assessed by a) the production of anti-SRBC antibodies, b) the permanence of delayed cutaneous reaction toT. cruzi antigen, to PPD and DNCB and c) the degree of blastogenic transformation of spleen lymphocytes in the presence of the specific antigen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01950179
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  • 2
    Electronic Resource
    Electronic Resource
    Unified approach to superposition states of the quantized radiation field (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 425-428 
    Details
    ISSN: 0392-6737
    Keywords: Nonclassical photon states (including antibunched, squeezed, sub-Poissonian) ; Quantum optics ; Algebraic methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary In the recent years various and interesting superposition states of the quantized radiation field were investigated in the literature, such as that involving two number states by Wodkiewiczet al.; that involving two coherent states by Hillery and Gerryet al.; that involving two squeezed states by Xinet al., etc. Here we study a general one-parameter superposition state which unifies those states and others in the literature, all becoming a particularization of ours. General expressions characterizing the physical properties of the field are obtained. The role played by the present superposition state as an alternative interpolating state is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451804
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  • 3
    Electronic Resource
    Electronic Resource
    A RAS-encoded protein in Dictyostelium discoideum is acylated and membrane-associated (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 1 (1987), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Dictyostelium dfscoideum synthesizes a 23000 Mr protein, p23dd-ras, closely related to the mammalian oncogene-encoded protein p21ras. To investigate the subcellular localization of P23dd-ras, conditions were optimized to reduce protein degradation following cell breakage. Subcellular fractionation of D. discoideum showed that p23dd-ras was associated predominantly with the membrane fraction during both vegetative growth and differentiation, in the absence of suitable protease inhibitors considerable amounts of a truncated form of p23dd-ras were recovered in the cytosol fraction, suggesting that intact p23dd-ras is attached to the membrane by a short terminal peptide sequence. Radio-isotope labelilng of D. discoideum with myristic acid or palmitic acid in the presence of excess un-labelled acetate resulted in radio-isotope incorporation into a select group of proteins including p23dd-ras. No acyl label appeared in the truncated cytoplasmic form of p23dd-ras when ceil breakage was performed In the absence of suitable protease inhibitors, indicating that the acyl group is associated with the short terminal peptide that is cleaved. These data suggest that p23dd-ras like its mammailan counterpart, is acylated and associated with the plasma membrane. There was no evidence during a 30-minute pulse of methionine for a cytoplasmic precursor to the membrane-bound p23dd-ras suggesting that the turnover of the presumptive precursor must be much more rapid in D. discoideum than for pro-p21ras in mammalian cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1987.tb01941.x
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  • 4
    Electronic Resource
    Electronic Resource
    dc amplifier with auto-zeroing of thermal drift (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1241-1243 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A dc strain-gauge bridge amplifier configuration with automatic compensation of thermal drift using common operational amplifiers is presented. The amplifier operation is divided into two steps: one of auto-zeroing and other of amplification of the input signal. The zeroing of the input signal is achieved by switching the bridge excitation to zero periodically at a frequency of about 100 Hz, thus limiting the maximum frequency of the input signal to about 8 Hz. With a gain of 5000, the output voltage drift of the amplifier is measured to be about 1 mV for a temperature change of 40 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139705
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  • 5
    Electronic Resource
    Electronic Resource
    Structural properties and Raman modes of zinc blende InN epitaxial layers (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 362-364 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on x-ray diffraction and micro-Raman scattering studies on zinc blende InN epitaxial films. The samples were grown by molecular beam epitaxy on GaAs(001) substrates using a InAs layer as a buffer. The transverse-optical (TO) and longitudinal-optical phonon frequencies at Γ of c-InN are determined and compared to the corresponding values for c-GaN. Ab initio self-consistent calculations are carried out for the c-InN and c-GaN lattice parameters and TO phonon frequencies. A good agreement between theory and experiment is found. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123072
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinearity and electrothermal feedback of high Tc transition edge bolometers (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 640-642 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of electrothermal feedback on the performance of a micromachined superconducting high Tc transition edge bolometer, over a temperature range 85–95 K, have been investigated. The system behaves nonlinearly, due to the variation of the resistance-temperature coefficient β with temperature. Optimum operating points of constant current mode (CCM) and constant voltage mode (CVM) modes vary with temperature and biasing conditions. In CCM, effective response time τeff varies little with temperature. The optimum output signal of CVM occurs at approximately 3–5 K lower temperature within the tail region, where β is maximum. The biasing voltage also displays a maximum, above which the bolometric performance degrades. The CCM exhibits a comparatively limited linear dynamic range. Negative thermal feedback causes a decrease of τeff of up to 2 orders of magnitude in CVM. CCM requires precise thermal stabilization at midtransition. Noise in both modes is limited by the 1/f contribution. Maximum D* values are slightly higher for CVM at higher frequencies. Bolometer operation in the CVM mode requires cooling the heatsink below 77 K, but does not need accurate temperature control. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125844
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal dynamics of VO2 films within the metal–insulator transition: Evidence for chaos near percolation threshold (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 4365-4367 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal dynamics of thin vanadium dioxide films at the martensitic metal–insulator phase transition has been evaluated experimentally by thermal excitation spectroscopy. Over the transition region, the device becomes highly nonlinear, and its bolometric performance is affected. At low thermal cycling rates for a temperature around the percolation threshold, the device stochastically switches into an unusual pattern. The originally smooth and monotonic shape of the R(T) curve for minor loops suddenly becomes unstable and unpredictable. By direct observation of at least two strange attractors, the phenomenon clearly has been identified as chaotic. Bolometric performance of VO2 based devices in the transition region may suffer strong degradation for low thermal cycling rates. In this region, sensor responsivity for periodic thermal excitation is significantly reduced. Resistance noise is 1/f-type and self-generated oscillations were observed at frequency 〈10−2 Hz. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1334917
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  • 8
    Electronic Resource
    Electronic Resource
    Raman phonon modes of zinc blende InxGa1−xN alloy epitaxial layers (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1095-1097 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transverse-optical (TO) and longitudinal-optical (LO) phonons of zinc blende InxGa1−xN (0≤x≤0.31) layers are observed through first-order micro-Raman scattering experiments. The samples are grown by molecular-beam epitaxy on GaAs (001) substrates, and x-ray diffraction measurements are performed to determine the epilayer alloy composition. Both the TO and LO phonons exhibit a one-mode-type behavior, and their frequencies display a linear dependence on the composition. The Raman data reported here are used to predict the A1 (TO) and E1 (TO) phonon frequencies of the hexagonal InxGa1−xN alloy. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124608
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  • 9
    Electronic Resource
    Electronic Resource
    Spreading of damage in ferromagnetic thin films: Profiles and temporal evolution : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3983-3985 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We numerically investigate the critical behavior of layered S=1/2 Ising ferromagnetic thin films with an enhanced surface coupling constant by using the spreading of damage technique through the Metropolis dynamics. We obtain that near the bulk critical spreading temperature, the Hamming distance profile changes its shape from a positive curvature profile for Js/J〈1.4 to a negative curvature profile for Js/J〉1.4, which is a signature of the reminiscent special surface-bulk transition which occurs in the semi-infinite system. Furthermore, we show that the temporal evolution of the damage front exhibits a typical exponential growth above critically while in the critical region the behavior is diffusive. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364914
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  • 10
    Electronic Resource
    Electronic Resource
    Tests of the methods of analysis of picosecond lifetimes and measurement of the half-life of the 569.6 keV level in ^2^0^7Pb
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 151 (1978), S. 221-225 
    Details
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-554X(78)90492-5
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