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  • 1
    Electronic Resource
    Electronic Resource
    Signaling pathways between the plasma membrane and endoplasmic reticulum calcium stores (2000)
    Springer
    Cellular and molecular life sciences 57 (2000), S. 1272-1286 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Calcium signaling; calcium pools; capacitative calcium entry; gene expression; apoptosis; endoplasmic reticulum structure; protein kinase C.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. This review discusses multiple ways in which the endoplasmic reticulum participates in and is influenced by signal transduction pathways. The endoplasmic reticulum provides a Ca2+ store that can be mobilized either by calcium-induced calcium release or by the diffusible messenger inositol 1,4,5-trisphosphate. Depletion of endoplasmic reticulum Ca2+ stores provides a signal that activates surface membrane Ca2+ channels, a process known as capacitative calcium entry. Depletion of endoplasmic reticulum stores can also signal long-term cellular responses such as gene expression and programmed cell death or apoptosis. In addition to serving as a source of cellular signals, the endoplasmic reticulum is also functionally and structurally modified by the Ca2+ and protein kinase C pathways. Elevated cytoplasmic Ca2+ causes a rearrangement and fragmentation of endoplasmic reticulum membranes. Protein kinase C activation reduces the storage capacity of the endoplasmic reticulum Ca2+ pool. In some cell types, protein kinase C inhibits capacitative calcium entry. Protein kinase C activation also protects the endoplasmic reticulum from the structural effects of high cytoplasmic Ca2+. The emerging view is one of a complex network of pathways through which the endoplasmic reticulum and the Ca2+ and protein kinase C signaling pathways interact at various levels regulating cellular structure and function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000765
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  • 2
    Electronic Resource
    Electronic Resource
    Enterochromaffin properties of granular cells in the heart of the snails Helix aspersa and Strophocheilus oblongus
    Amsterdam : Elsevier
    Comparative Biochemistry And Physiology 37 (1970), S. 481-484+IN11-IN14+485-492 
    Details
    ISSN: 0010-406X
    Keywords: Gomori negative innervation ; Snail heart ; bipolar neuron ; double innervation ; enterochromaffin granulation ; granular cells ; granular deplection ; osmiophilic and non-osmiophilic nerves ; osmiophilic free endings ; secretory cycle by granular cells ; stimulated heart
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0010-406X(70)90094-0
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  • 3
    Electronic Resource
    Electronic Resource
    Optoelectronic and structural properties of Er-doped sputter-deposited gallium–arsenic–nitrogen films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2321-2328 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Erbium-doped gallium–arsenic–nitrogen thin films were prepared by cosputtering a crystalline GaAs target partially covered with small pieces of metallic erbium in an Ar+N2 atmosphere. The films were deposited near room temperature and under increasing partial pressures of nitrogen P(N2). The investigation of the films included ion beam analysis, optical spectroscopy in the infrared–visible–ultraviolet energy ranges, Raman scattering, and photoluminescence measurements. According to the experimental results, all films present an amorphous structure and nitrogen contents that scale with P(N2). Increasing amounts of nitrogen induce the widening of the optical band gap and a systematic redshift of the Raman signal of the films considered. The intensity of the Er-related light emission at ∼0.8 eV also increases at higher nitrogen contents. A detailed study of the absorption bands in the infrared region allowed the identification of different vibration modes involving gallium, arsenic, and nitrogen atoms. The combined analysis of the compositional data and of the infrared absorption bands provided a constant of proportionality between the nitrogen content in the films and the integrated absorption due to Ga–N bonds. Where applicable, comparisons between the optoelectronic and structural characteristics of amorphous and crystalline gallium–arsenic–nitrogen compounds were made. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388568
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  • 4
    Electronic Resource
    Electronic Resource
    Improved laser-heated pedestal growth system for crystal growth in medium and high isostatic pressure environment (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4606-4608 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A modified apparatus for single-crystal-fiber growth in an isostatic gaseous environment and for a large range of pressure (100 mbar up to 100 bar) using a floating-zone-type method known as laser-heated pedestal growth is described. The difficulties and advantages of its design are discussed through examples of crystal growth of some oxide materials. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150120
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of Fe17R2 phases (R=Pr and Sm) oxidized at 200 °C : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5973-5975 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of oxygen absorption in temperatures ranging from 200 to 500 °C are reported for the phases Fe17R2, R=Pr and Sm. It was observed that the oxygen saturation limit is temperature dependent, being of 3 at/fu at 200 °C, 12.8 at/fu at 300 °C, 20.3 at/fu at 400 °C, and 28.5 at/fu at 500 °C. This implies that above 200 °C the phase is deeply altered by oxygen absorption. Samples with absorption at 200 °C were studied as prepared and heat treated at 500 °C/40 h. The results show that the heat-treated samples consist of Fe17R2, Fe, and R2O3. Metallographic examination, susceptibility, and Mössbauer spectroscopy data support the hypothesis that the as-prepared samples consist of a mixture of Fe17R2 and ordered interstitial Fe17R2Ox. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362124
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  • 6
    Electronic Resource
    Electronic Resource
    Optical spectroscopy of Er3+ and Yb3+ co-doped fluoroindate glasses (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 2256-2260 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical absorption, Stokes, and anti-Stokes photoluminescence were performed on Er3+–Yb3+ co-doped fluoroindate glasses. For compounds prepared with a fixed 2 mol % ErF3 concentration and YbF3 contents ranging from 0 to 8 mol %, important upconversion processes were observed as a function of temperature and photon excitation energy. Based on the experimental data, two mechanisms for the upconversion (or anti-Stokes photoluminescence) processes were identified and analyzed in detail. At high Yb contents, the upconversion mechanisms are mostly determined by the population of the 2F5/2 levels of Yb3+ ions (or 4I11/2 levels of Er3+ ions, by energy transfer) regardless of the photon excitation energy and temperature of measurement. Moreover, green and red light emission have similar intensities when a large Yb3+ content is present. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366965
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  • 7
    Electronic Resource
    Electronic Resource
    Activation energy and enthalpy of decomposition for the Fe17Sm2 nitride : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5109-5111 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Decomposition studies of the Fe17Sm2N3 compound were done using a Calvet-type microcalorimeter and a simultaneous gravimetric and differential thermal analyzer (DTA). The results show that the decomposition has onset temperature of 570 °C and proceeds up to 900 °C, and presents only one well determined exothermic thermal event. The calorimetric measurement shows that the enthalpy associated with the decomposition is 69 kJ/mol. The activation energy of the process was also determined using the Kissinger method applied to the DTA signal. It was observed that there was only one activation energy for the decomposition process, with a value of 339 kJ/mol. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365152
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  • 8
    Electronic Resource
    Electronic Resource
    A detailed study of nitride precipitates in Nd2Fe17 : 38th Annual Confrerence on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6003-6005 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report electron microprobe measurements of the diffusion profile in partially nitrided samples of the Fe17Nd2 phase. The results are fully consistent with a step-like profile. This confirms that the nitrogenation process is one of precipitating a fully nitrided phase from a nitrogen-free phase. We report also x-ray diffraction patterns for the partially nitrided samples as a superposition of the pure and nitrided patterns, with displacements and broadenings of lines due to mutual stresses between the phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355489
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  • 9
    Electronic Resource
    Electronic Resource
    Magneto-hydro-dynamic limits in spherical tokamaks : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1958-1968 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The operational limits observed in spherical tokamaks, notably the small tight aspect ratio tokamak (START) device [A. Sykes et al., Nucl. Fusion 32, 694 (1992)], are consistent with those found in conventional aspect ratio tokamaks. In particular the highest β achieved (∼40%) is consistent with an ideal magneto-hydro-dynamic (MHD) Troyon type limit, the upper limit on density is well described by the Greenwald density (πa2n¯e/Ip∼1) and the normalized current (Ip/aBt) is limited such that q95(approximately-greater-than)2. Stability calculations indicate scope for increasing both normalized β and normalized current beyond the values so far achieved, although wall stabilization is generally needed for low-n modes. In double null configurations current terminating disruptions occur at each of the operational boundaries, though the current quench tends to be slow at the density limit and disruptions at high β may be due to the low q. In early limiter START discharges, before the divertor coils were installed, disruptions rarely occurred. Instead internal reconnection events which have all the characteristics of a disruption except the current quench occurred. These various disruptive behaviors are explained in terms of a model in which helicity is conserved during the disruption. Due to the low toroidal field beam ions in START, and α particles in a ST power plant, are super-Alfvénic. This gives the possibility for toroidal Alfvén eigenmodes (TAEs) to occur and such modes are frequently observed in START neutral beam injection (NBI) discharges, but seem to be benign. The features of these observed TAEs are shown to be in agreement with MHD calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873493
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  • 10
    Electronic Resource
    Electronic Resource
    Time-resolved analysis of Mirnov oscillations (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3710-3715 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We discuss the application of time-resolved spectral analysis to interpret the magnetohydrodynamic or Mirnov oscillations in tokamaks. As an example, the technique is applied to analyze the Mirnov oscillations measured in the small tokamak TBR-1 with and without external helical perturbations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143602
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