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  • Artikel  (38)
  • Springer  (20)
  • American Institute of Physics (AIP)  (6)
  • International Union of Crystallography  (4)
  • Environmental & Engineering Geophysical Society  (3)
  • Wiley  (3)
  • Society of Exploration Geophysicists (SEG)  (2)
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  • Artikel  (38)
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  • 1
    Digitale Medien
    Digitale Medien
    Applications of intense pulsed ion beam to materials sciencef| (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1730-1737 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In addition to being initially developed as an energy driver for an inertial confinement fusion, an intense, pulsed, light-ion beam (LIB) has been found to be applied to materials science. If a LIB is used to irradiate targets, a high-density "ablation'' plasma is produced near the surface since the range of the LIB in materials is very short. Since the first demonstration of quick preparation of thin films of ZnS by an intense, pulsed, ion-beam evaporation (IBE) using the LIB-produced ablation plasma, various thin films have been successfully prepared, such as of ZnS:Mn, YBaCuO, BaTiO3, cubic BN, SiC, ZrO2, ITO, B, C, and apatite. Some of these data will be presented in this paper, with its analytic solution derived from a one-dimensional, hydrodynamic, adiabatic expansion model for the IBE. The temperature will be deduced using ion-flux signals measured by a biased ion collector. Reasonable agreement is obtained between the experiment and the simulation. High-energy LIB implantation to make chemical compounds and the associated surface modification are also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.870677
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  • 2
    Digitale Medien
    Digitale Medien
    Hyper-resolution Brillouin–Rayleigh spectroscopy with an optical beating technique (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2136-2139 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A system of optical beating spectroscopy has been newly developed for hyper-resolution Brillouin scattering. Frequency resolution as high as 1 kHz was obtained, far beyond the limit of the classical Fabry–Perot interferometer which is commonly used in ordinary experiments. This system is useful over the frequency range from 104 to 109 Hz at present. Experiments for Rayleigh and/or Brillouin spectra were performed in water, toulene, and carbon disulfide to demonstrate the performance of this system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143950
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  • 3
    Digitale Medien
    Digitale Medien
    Analysis of two-step-growth conditions for GaN on an AlN buffer layer (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 192-200 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Gallium nitride is grown by metalorganic vapor phase epitaxy with and without a low-temperature-grown AlN buffer layer. Variations in the surface morphology and the layer properties are compared between two-step growth and direct growth to study the effects of various growth conditions. It is found that (i) conditions that stabilize the GaN(0001) surface serve as guidelines for obtaining mirrored surfaces, and (ii) raising GaN growth temperature improves crystallographic, electrical, and luminescence properties of GaN. The observed improvement in the layer properties with increase in GaN growth temperature suggests that increasing N2 dissociation pressure does not affect GaN properties. GaN growth conditions are analyzed thermodynamically to show that NH3 in the growth ambients has the potential to suppress thermal dissociation of GaN. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359368
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  • 4
    Digitale Medien
    Digitale Medien
    Lasing characteristics of low threshold ZnSe-based blue/green laser diodes grown on conductive ZnSe substrates (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 102-104 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Room temperature continuous wave operation of ZnSe-based blue/green laser diodes grown homoepitaxially on conductive ZnSe substrates with threshold current densities as low as 176 A/cm2 has been demonstrated. This is the lowest reported threshold among all short wavelength lasers in the blue/green region. Lifetimes at room temperature of up to 2.1 h have been obtained for lasers with pre-existing defect densities lower than 3×104 cm−2. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.121781
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  • 5
    Digitale Medien
    Digitale Medien
    Substrate-polarity dependence of metal-organic vapor-phase epitaxy-grown GaN on SiC (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4531-4535 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single-crystal gallium nitride was grown on each of the two polar {0001} planes of 6H-silicon carbide substrates utilizing metal-organic vapor-phase epitaxy. The substrate polarity is clearly shown to strongly influence the surface morphology and the photoluminescence property of the layer. The examination of the layer surfaces using x-ray photoelectron spectroscopy revealed that {0001} GaN grown on the basal planes of SiC changes its polarity in accordance with the substrate polarity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341281
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  • 6
    Digitale Medien
    Digitale Medien
    Photoluminescence of InGaN films grown at high temperature by metalorganic vapor phase epitaxy (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2251-2253 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: InGaN single-crystal films were grown on (0001) plane sapphire substrates at 800 °C by metalorganic vapor phase epitaxy. By using such a high temperature for growth, the crystalline quality has been greatly improved. But a high nitrogen over pressure and high indium source flow rate were necessary to achieve significant indium incorporation during growth. For the first time, photoluminescence has been observed in InGaN, and near-band edge emission is seen in the photoluminescence at 77 K. From this photoluminescence, the dependence of a near-band edge emission on the indium mole fraction of InGaN has been investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.106086
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  • 7
    Digitale Medien
    Digitale Medien
    Differential effects of the serotonin receptors on cultured rat cerebral cortical neurons (1997)
    Springer
    Cellular and molecular life sciences 53 (1997), S. 233-236 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Key words. Serotonin; ligand-gated receptor; G-protein-coupled receptor; patch-clamp; cerebral cortical neuron.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. Effects of serotonin (5-HT) on cerebral cortical neurons were examined by patch clamp techniques. 5-HT produced a variety of responses such as outward (19/73 patches/neurons), slow inward (15/73 patches/neurons), fast inward (8/73 patches/neurons), and mixed currents (initially fast inward deflection followed by an outward response: 2/73 patches/neurons), with a latency of 12 sec, 15 sec, 0 sec, and 0 sec respectively, at a holding potential of −60 mV in whole-cell patches. The fast inward currents were again evoked by a selective 5-HT3 receptor agonist, 1-(m-chlorophenyl)-biguanide hydrochloride (CPBG). In the cell-attached patch clamp configuration, 5-HT inside the patch pipette elicited single channel currents with slope conductances of 42 pS and 132 pS (4/42 patches/neurons). CPBG inside the patch pipette evoked inward single channel currents with a lower slope conductance of 41 pS (3/23 patches/neurons). In contrast, application of 5-HT or a 5-HT2 receptor agonist, α-methyl-5-hydroxytryptamine-maleate, outside the patch pipette induced outward single channel currents with a major slope conductance of 140 pS (8/30 patches/neurons) or 135 pS (6/20 patches/neurons), respectively. These results indicate that the outward and fast inward currents may be mediated respectively by the 5-HT2 receptor, which is coupled to a G-protein, and by the 5-HT3 receptor, which contains the non-selective cation channel, and that the mixed type may be caused by both the 5-HT2 and 5-HT3 receptors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00000596
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  • 8
    Digitale Medien
    Digitale Medien
    Expression of ecdysteroid-regulated genes is reduced specifically in the wing discs of the wing-deficient mutant (fl) of Bombyx mori (2000)
    Springer
    Development genes and evolution 210 (2000), S. 120-128 
    Details
    ISSN: 1432-041X
    Schlagwort(e): Key words Key words: Wing-deficient mutant fl ; Bombyx mori ; Wing imaginal discs ; Ecdysteroid ; Metamorphosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The wing-deficient mutant, flügellos (fl), of the silkworm, lacks four wings in the pupa and the adult. Previous studies have suggested that the fl wing discs lose responsiveness to ecdysteroid during metamorphosis. To test this hypothesis at the molecular level we compared the expression of 12 genes when the wing discs from the wild-type (WT) and fl larvae were cultured in the presence or absence of 20-hydroxyecdysone (20E). Most of the genes tested here, ecdysteroid-inducible (EcR-A, -B1,and E75) and noninducible genes (actin A3, β-tubulin, apterous (ap), USP, and BHR38) were normally expressed in the fl wing discs. However, the amounts of mRNAs of two ecdysteroid-inducible genes, BHR3 (early-late gene; Bombyx homologue to DHR3 and MHR3) and Urbain (wing-specific late gene), were reduced to about 50% and 20% of WT in the cultured fl wing discs, respectively. We analyzed developmental profiles of these mRNAs during metamorphosis. They also demonstrated decreased BHR3 and Urbain mRNA 2 days after the onset of wandering. This reduction in transcription of BHR3 in the fl mutant was observed only in the wing disc, not in the testis and fatbody. These results imply that the aberrant expression of the fl gene affects the downstream pathway of ecdysteroid signaling specifically in the wing discs and thus leads to a deficiency in wing formation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004270050018
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  • 9
    Digitale Medien
    Digitale Medien
    Establishment and Characterization of a Culture System for Enzymatically Released Rat Dental Pulp Cells (2000)
    Springer
    Calcified tissue international 66 (2000), S. 139-144 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Key words: Dental pulp cells — Cell culture — Odontoblast-like cells — Differentiation.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Abstract. To establish a cell culture system that reflects the dentin formation in dental pulp tissue, we used dental pulp cells enzymatically isolated from rat incisor teeth. During the 20-day culture period, the cells exhibited various phenotypes of the odontoblast differentiation process, from the immature stage to the terminal mineralization stage. The cells began to form the mineralized nodules from day 10, and the nodules became larger by day 20. Alkaline phosphatase (ALP)-positive cells surrounded the mineralized nodules. The ALP activity in the cell layers was maximal on day 5, and gradually decreased to day 20. The calcium content in the cell layers was very low by day 10, and significantly increased from day 15. Sulfated glycosaminoglycans (GAGs) contained in the cell layers increased by day 15, but the content then decreased by day 20. The dental pulp cells produced a small amount of osteocalcin that was released into the culture medium by day 10, and the amount secreted increased markedly from day 15. The expression of osteocalcin and parathyroid hormone/parathyroid hormone-related peptide (PTH/PTHrP) receptor mRNA was evident as early as day 5, and the expression of each gradually increased with the number of days in culture. Dentin matrix protein (Dmp1) mRNA gene transcripts were identified by use of the reverse transcription polymerase chain reaction (RT-PCR) in the cells throughout the culture period. The present results demonstrate that this culture system is useful for studying the differentiation process of the odontoblast-like cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002230010028
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  • 10
    Digitale Medien
    Digitale Medien
    Interaction between valproate formulation and phenytoin concentrations (1995)
    Springer
    European journal of clinical pharmacology 48 (1995), S. 61-63 
    Details
    ISSN: 1432-1041
    Schlagwort(e): Valproate ; Phenytoin ; drug interaction ; slow-release tablet
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Abstract Changes in phenytoin concentrations caused by switching valproate formulations with different absorption rates were retrospectively investigated in eleven epileptic patients receiving treatment with both drugs. Total plasma phenytoin concentrations were measured before and after a standard tablet of valproate was replaced by the same dose as a slow-release tablet. The mean plasma phenytoin level rose significantly from 14.4 to 18.7 μg·ml−1. Nine of eleven patients had markedly increased phenytoin levels (by 21 to 72%), and two developed toxic symptoms. The results indicate that changing valproate formulations can cause major alterations in the plasma concentration of co-administered phenytoin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00202174
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