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  • 1
    Electronic Resource
    Electronic Resource
    Exotic states in the E–e Jahn–Teller problem (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4509-4517 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Fulton–Gouterman transformation is applied to the dynamical E–e Jahn–Teller problem. This approach leads to an unconventional way of visualizing the exact eigensolutions of the problem. It turns out that in the upper energy region, eigenfunctions with unexpected behavior make their appearance ("exotic states''). They practically have no distortion in the oscillatory subspace, whereas eigenfunctions of large radial oscillatory displacement are found in their immediate energetic neighborhood. In a rough way, these exotic states may be attached to the upper potential sheet of the "Mexican hat'' and furthermore they can be shown to be related to the "Slonczewski resonances.''
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462812
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  • 2
    Electronic Resource
    Electronic Resource
    Enhanced Sensitivity of “Metabotropic” Glutamate Receptors After Induction of Long-Term Potentiation in Rat Hippocampus (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 57 (1991), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Stimulation of [3H]inositol monophosphate 〈[3H]InsP) formation by ibotenate or trans-1-aminocyclopentyl-l, 3-dicarboxylic acid (t-ACPD) in rat hippocampal slices was enhanced after tetanic stimulation of die Schaffer collaterals projecting to the CA1 region (in vitro) or the perforant pathway projecting to the dentate gyms (in freely moving animals). This effect was observed 5 h (but not 2 h) after long-term potentiation (LTP) induction and was abolished if tetanic stimulation was performed in the presence of specific antagonists of N-methyl-D-aspartate receptors. The delayed increase in excitatory amino acid-induced polyphosphoinositide (PPI) hydrolysis was accompanied by an enhanced responsiveness to norepinephrine, whereas the basal and carbamylcholine-stimulated [3H]InsP formation were unchanged. These results suggest that an increased activity of „metabotropic” glutamate receptors may contribute to the synaptic mechanisms enabling the late expression and or maintenance of LTP. Accordingly, LTP decayed more rapidly (within 5 h) in rats repeatedly injected with LiCl (60–120 mg/kg, i.p., for 10 days), a treatment that led to a reduced efficacy of ibotenate and norepinephrine in stimulating PPI hydrolysis in hippocampal slices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1991.tb03763.x
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of an in vitro model of human melanoma invasion based on reconstructed human skin (2000)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 142 (2000), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this study was to compare the invasive properties of normal human cutaneous melanocytes and of a cutaneous melanoma cell line (HBL) in a three-dimensional model of reconstructed human skin. Specifically, we asked to what extent the pigmentary and invasive behaviour of both cells is influenced by their interaction with adjacent skin cells (keratinocytes and fibroblasts) and the basement membrane (BM). In the presence of a BM, normal human melanocytes within this model remained within the basal layer of keratinocytes and did not pigment spontaneously. When the BM was removed, melanocytes were found suprabasally and pigmented extensively. No significant invasion of melanocytes into the dermis was detected in the presence or absence of the BM. HBL melanoma cells showed no significant ability to invade into the dermis in the absence of other cells, irrespective of the presence or absence of the BM. However, when added to keratinocytes and fibroblasts, HBL cells showed a capacity to invade into the dermis, both in the presence and absence of the BM. Associated with HBL invasion into the dermis, we noted significant keratinocyte entry into the dermis. On their own, keratinocytes entered the dermis in the absence of the BM but showed no significant penetration into the dermis when the BM was present. In summary, this model demonstrates clear differences between melanocytes and a melanoma cell line with respect to their invasive properties. It also allows demonstration of interactions between cells, and between cells and the BM. The study also provides evidence for a synergistic interaction between this melanoma cell line and keratinocytes in penetrating the BM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.2000.03287.x
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  • 4
    Electronic Resource
    Electronic Resource
    Multijunction upper subcell cascade photovoltaics for space applications (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 540-546 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new class of cascade high-efficiency photovoltaics designed for space-based applications is proposed. The design improves upper subcell performance and avoids electrical and optical losses associated with an intercell ohmic contact. Multijunction upper subcells reduce bulk recombination of photogenerated minority carriers by decreasing the average collection distance, yielding improved spectral response and radiation tolerance. A three-terminal design is employed which circumvents the need for a monolithic intercell contact and, thus, the losses associated with such a contact. Problems related to array interconnection of three-terminal devices may be solved by creating a two-terminal cell from complementary pairs (n-p-n and p-n-p) of three-terminal cells. Simulations of lattice-matched AlGaAs-GaAs and lattice-mismatched AlGaAs-InGaAs cascade cells show that one-sun AM0 efficiencies in excess of 26% and 28%, respectively, are possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341142
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  • 5
    Electronic Resource
    Electronic Resource
    Explosive crystallization in silicon (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3091-3099 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A survey of the possible autocatalytic crystallization processes called explosive crystallization in liquid and solid states is given. The explosive liquid-phase epitaxy with laterally moving coupled interfaces of melting and crystallization in amorphous silicon layers on insulators is investigated by the use of an experimental equipment consisting of three synchronized lasers supplying the temperature pulses for ignition, spreading, and stopping of the explosive front. The velocity of this explosive crystallization front measured by use of time-resolved reflectivity of a test beam is compared with the results of model calculations. The results are in good agreement. The crystal structure was investigated by optical and transmission electron micrography and represents crystalline laminae grown preferentially in the 〈110〉 direction over a distance of about 100 μm. Areas of some millimeters in diameter can be crystallized by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336910
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  • 6
    Electronic Resource
    Electronic Resource
    Resistance bi-stability in resonant tunneling diode pillar arrays (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1234-1236 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and characterized resonant tunneling diode pillar arrays. The array resistance switches between two stable states with a maximum room temperature current peak to valley ratio of 500:1. Both the high and the low resistance states are stable at zero bias suggesting that the device may be used for non-volatile memory storage. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113247
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  • 7
    Electronic Resource
    Electronic Resource
    Turbulent mixing at high dilution ratio in a Sulzer-Koch static mixer (1986)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 25 (1986), S. 108-116 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i200032a017
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  • 8
    Electronic Resource
    Electronic Resource
    Model Catalytic Oxidation Reactions: Oxygen with H2, NH3, and N2H4 on Rh(111) (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 805-815 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100002a051
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  • 9
    Electronic Resource
    Electronic Resource
    Elementary Reactions of CF2(.lambda.lX) with O3 and O2 (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 10847-10852 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100027a027
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  • 10
    Electronic Resource
    Electronic Resource
    Measurements and stability calculations of the disturbance growth in an unstable three-dimensional boundary layer (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2371-2377 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The amplification of disturbances developing under conditions of natural transition in the unstable three-dimensional boundary-layer flow on a swept-back flat plate is measured with the aid of hot-wire anemometry. A detailed analysis of the experimental data allows identification of the most amplified instability modes and determination of their growth rates. The results are compared with linear stability theory. Although the amplification process is affected by nonlinearities starting a short distance downstream of the positions where the disturbances become of measurable size, in some essential respects the applicability of linear theory can be examined. It turns out that the initial amplification rates of the stationary instability modes are fairly well predicted whereas the amplification rates of the nonstationary modes are overestimated. A remarkable feature is that the disturbances with the largest amplitudes are not, in every case, the most amplified ones in theory as well as in experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858176
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