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  • 1
    Electronic Resource
    Electronic Resource
    5-Aza-2'-deoxycytidine as inducer of differentiation and growth inhibition in mouse neuroblastoma cells
    Amsterdam : Elsevier
    Cell Differentiation and Development 27 (1989), S. 47-55 
    Details
    ISSN: 0922-3371
    Keywords: 5-Aza-2'-deoxycitidine ; Cell differentiation ; Cell growth inhibition ; DNA methylation ; Neuroblastoma cell
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0922-3371(89)90043-9
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  • 2
    Electronic Resource
    Electronic Resource
    Asr genes belong to a gene family comprising at least three closely linked loci on chromosome 4 in tomato (1996)
    Springer
    Molecular genetics and genomics 252 (1996), S. 489-492 
    Details
    ISSN: 1617-4623
    Keywords: Lycopersicon esculentum ; Asr ; RFLP mapping ; Gene family
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Asr1, Asr2 andAsr3 are three homologous clones isolated from tomato whose expression is believed to be regulated by abscisic acid (ABA); the corresponding genes thus participate in physiological and developmental processes such as responses of leaf and root to water stress, and fruit ripening. In this report, results obtained with Near Isogenic Lines reveal thatAsr1, Asr2 andAsr3 represent three different loci. In addition, we map these genes on the restriction fragment length polymorphism (RFLP) map of the tomato genome by using an F2 population derived from an interspecific hybrid crossL. esculentum × L. penelli. RFLP data allow us to map these genes on chromosome 4, suggesting that they belong to a gene family. The elucidation of the genomic organization of theAsr gene family may help in understanding the role of its members in the response to osmotic stress, as well as in fruit ripening, at the molecular level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173015
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  • 3
    Electronic Resource
    Electronic Resource
    Structural investigation of the titanium/diamond film interface (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3552-3560 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Reflection high-energy electron diffraction (RHEED) technique, with the possibility to shift, rotate, and tilt the sample with respect to the electron beam, has been used to investigate the structure of the transition layers formed at the interface between titanium substrate and diamond films. The diamond films were deposited on partially masked titanium sheets by means of the chemical vapor deposition technique, using CH4/H2 mixtures activated by hot filament. Deposition experiments have been performed at 650 and 730 °C. The RHEED analysis has been carried out in selected area conditions on the boundary between coated and uncoated regions; it enabled us to detect and characterise the inhomogeneous and complex structural configuration of the diamond/titanium interface. For the samples deposited at 650 °C we identified, starting from the titanium surface: a mixed phase constituted by titanium hydride and carbide precipitates, graphitic clusters embedded into a titanium hydride/carbide phase, TiC layers, and finally diamond films. At 730 °C both growth location and formation sequence of the various structures were found to be similar to those detected at 650 °C, resulting, however, in the complete absence of the Ti hydride phase. A first indication about the time scale of the process has been determined from structural investigations of deposits grown by runs lasting from 3 up to 20 min. A schematic model is presented which describes the growth sequence of the various species inside the intermediate reaction layers. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363228
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  • 4
    Electronic Resource
    Electronic Resource
    Laser-induced structural modifications of glassy carbon surfaces (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4307-4311 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural modifications induced by pulsed laser irradiations in the surface layers of glassy carbon have been monitored by reflection high energy electron diffraction, Raman spectroscopy, and electron energy loss spectroscopy. The glassy carbon samples were irradiated by 30 superimposed laser pulses (λ´=6.943 nm). The energy density (100–500 mJ/cm2 per pulse) delivered to the material and the repetition rate of the laser (0.05 Hz) have been chosen so that the temperature increase of the irradiated surface layers was below the melting point of the glassy carbon. The combined use of the analysis techniques indicated that the beginning of the solid state processes, leading to microstructural modifications of the surface layers, occurs at energy density of 300 mJ/cm2. An increase of the average crystalline size of graphitic clusters occurs upon radiation performed at fluences of 300 and 400 mJ/cm2, whereas at higher energy density the material undergoes complete amorphization. The analysis of chemical state and microstructure of the irradiated samples clearly demonstrates that graphitization or, conversely amorphization of glassy carbon surface layers can be achieved by a proper choice of the laser irradiation conditions. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359558
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  • 5
    Electronic Resource
    Electronic Resource
    Direct laser indiffusion of Ti into LiNbO3 single crystals (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5888-5891 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The successful indiffusion of Ti into single-crystalline LiNbO3 substrates is reported as a result of high-intensity ruby laser irradiation of LiNbO3 samples coated with films of Ti of 400 A(ring) thickness. The experimental data are compared to the results of cw CO2 or Ar ion laser irradiations. We conclude that the Ti indiffusion process starts with the oxidation of Ti and continues in a liquid phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350486
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  • 6
    Electronic Resource
    Electronic Resource
    End reflections and triple transit contribution to the band shape of magnetostatic volume wave delay lines (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3082-3086 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis of the signal reflections originating at the garnet film ends and of the triple transit between the microstrip transducers in magnetostatic volume wave delay lines has been performed. The influence of those effects on the band shape and on the insertion loss of magnetostatic wave devices has been inferred and compared with experimental results. In this framework, the possible utilization of the reflections for filterbank applications is also proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352992
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  • 7
    Electronic Resource
    Electronic Resource
    Low-power pulsed-laser annealing of implanted GaAs (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3882-3885 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-power annealing by a pulsed laser is used to recover the structure of low-dose implanted (100) GaAs crystals. Reflection high-energy electron diffraction with variable glancing incidence is employed to detect the structural changes at different depths in the specimens. The depth dependence of the damage is studied in more detail by Rutherford backscattering analysis. The annealing results depend on the irradiation conditions. A laser energy window below the melting threshold is found within which the structure can be restored to about as high degree of crystallinity as the virgin one, without any visible surface damage. A simple theoretical estimate shows that the temperature rise of the material is far below the melting threshold. This rise is too short in time to cause substantial dopant diffusion; however, it can enhance well the point-defect mobility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348445
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  • 8
    Electronic Resource
    Electronic Resource
    Reaction of CF3 radicals on fused silica between 320 and 530 K (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 2400-2407 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction between CF3 radicals and silicon oxide (fused silica) surface was studied in a VLPΦ flow reactor (∼0.1–3 mTorr) as functions of surface temperature (320–530 K) and CF3 concentration. The CF3 radicals were generated from CF3I by CO2 laser photolysis, and the subsequent gas-phase reaction products were followed by mass spectroscopy. The surface reaction was found to yield CO, HF, CO2, COF2, and SiF4. It was found that H2O residing on the silicon oxide surface was largely responsible for the oxygen- and hydrogen-containing products, and that little etching of the SiO2 itself occurred under these conditions. The rates for the irreversible surface loss of CF3, and for the formation of CO were both first order with respect to [CF3]. These were found to be temperature dependent with Ea(approximately-equal-to)4.7 and 7.5 kcal/mol, respectively. The CF3 surface loss rate indicates that the sticking coefficient for this radical on quartz is between 0.0014–0.017 for the temperature range of this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450836
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  • 9
    Electronic Resource
    Electronic Resource
    Stability of a compressed gas bubble in a viscous fluid (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 915-923 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of the spherical shape of the free surface of a gas bubble compressed by an incompressible fluid as it appears in the inertial confinement fusion problem is considered. (i) The equations derived by Prosperetti [Accad. Naz. Lincei 62, 196 (1977)] generalizing the Plesset equation are recovered in cases when the outer fluid is nonviscous, the flow being not potential, and it is shown that vorticity may change drastically the results of the potential case. (ii) In the case of viscous external fluid, the equations derived by Prosperetti [Q. Appl. Math. 1, 399 (1977)] and other external conditions on a sphere of finite radius are derived. (iii) Assuming that the time scale of the dynamics of the spherical bubble is large with respect to the time scale of the perturbation (frozen assumption), the linear stability of the collapsing bubble is studied numerically. The parameters are here (a) an inertia force (related with acceleration R¨ of the radius of the bubble), (b) the Reynolds number built with the decaying rate of the bubble, (c) surface tension, and (d) the aspect ratio (ratio between the gap width of the viscous fluid and the radius of the bubble). It is shown that the spherical shape is always linearly unstable in the absence of surface tension. In the presence of surface tension, there is a critical inertia parameter value and the most dangerous mode is always stationary. For the case of a large surface tension, the spherical wavenumber l of the most dangerous mode, is low. Finally, it is shown that the Rayleigh–Taylor instability might only be observed for both small aspect ratio and Reynolds number, depending on the surface tension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857402
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  • 10
    Electronic Resource
    Electronic Resource
    On the three-dimensional instability of elliptical vortex subjected to stretching (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2084-2090 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is known that two-dimensional vortices are subject to generic three-dimensional instabilities. This phenomenon is located near the core of vortices and depends on the eccentricity of their streamlines. In this paper we are concerned with the modification of this instability when stretching is applied to such vortices. We describe this instability by linearizing the Navier–Stokes equations around a basic state, which is an exact time-dependent solution. The complete system for the perturbations is reduced to a single equation for the perturbed velocity along the vortex span. In the limit of weak stretching, a perturbation theory can be performed and leads to a WKBJ approximation for the solution. This procedure demonstrates that a small amount of stretching is able to prevent the appearance of three-dimensional instabilities for vortices with a low enough eccentricity. Since most vortices are slightly elliptical in turbulent flows, the above computations are expected to cover a wide range of experimental cases. In particular, it is tentatively argued that this mechanism may explain recent experimental observations [Phys. Fluids 7, 630 (1995)]. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868982
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