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  • 1
    Electronic Resource
    Electronic Resource
    INCREASED CA2+ INFLUX IN THE RESTING STATE MAINTAIN THE MYOGENIC TONE AND ACTIVATES CHARYBDOTOXIN-SENSITIVE K+ CHANNELS IN FEMORAL ARTERIES FROM YOUNG SHR (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 22 (1995), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. To determine the possible role of voltage-dependent Ca2+ channels (VDCC) and Ca2+-activated K+ (KCa) channels in the regulation of resting tone of arteries from young spontaneously hypertensive rats (SHR), mechanical responses to the agents which interact with these channels were examined in endothelium-denuded strips of femoral arteries from 4 week old SHR and age-matched normotensive Wistar-Kyoto (WKY) rats. Systolic blood pressures at this age were not significantly different between SHR and WKY.2. The strips from SHR, but not from WKY, maintained a myogenic tone; that is, the resting tone decreased when nifedipine was added.3. Studies using 1 or 5 min pulse labelling of the strips with 45Ca showed that the basal Ca2+ influx was increased in SHR when compared with WKY, and this increase in SHR was abolished by nifedipine. Similar results were obtained when the cytoplasmic Ca2+ concentration ([Ca2+]i) in the resting state of the strips was measured by fura-PE3.4. The addition of charybdotoxin (ChTX, a blocker of large conductance Kca channels) to the resting state caused a concentration-dependent contraction, which was much greater in SHR than in WKY. The ChTX-induced contraction in SHR was abolished by nifedipine.5. In strips preloaded with 86Rb, the basal 86Rb efflux rate constant was significantly greater in SHR than in WKY. The increase in 86Rb efflux in SHR was abolished by nifedipine.6. The results suggest that the Ca2+ influx via L-type VDCC was increased in the resting state of the femoral artery from 4 week old SHR, and therefore the myogenic tone was maintained and ChTX-sensitive K+ channels were highly activated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1995.tb02892.x
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  • 2
    Electronic Resource
    Electronic Resource
    Absorption band oscillator strengths of N2 transitions between 95.8 and 99.4 nm (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 4809-4814 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoabsorption cross sections for seven electric dipole-allowed N2 bands, at wavelengths between 95.8 and 99.4 nm, have been measured with an instrumental resolution of 6.2×10−4 nm. Integrated cross sections and band oscillator strengths are presented for the c4' 1Σu+(v'=0)–X 1Σg'(v ‘=0) and c3 1Πu(v'=0)–X 1Σg+(v‘=0) transitions, as well as for five bands (v'=0,1,2,3,4) in the b 1Πu(v')–X 1Σg+(0) progression. The results are compared with earlier, lower resolution absorption measurements, electron scattering measurements, and calculations based on a deperturbation analysis of the excited states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463835
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  • 3
    Electronic Resource
    Electronic Resource
    Lyman-α, Lyman-α coincidence detection in the photodissociation of doubly excited molecular hydrogen into two H(2p) atoms (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3016-3021 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodissociation processes of the doubly excited states of H2 into H(2p)+H(2p) have been studied using a coincidence detection of two Lyman-α photons. Coincidence spectra have been measured in the energy region of 29.0–36.0 eV. The intensity of the observed coincidence peak corresponding to two Lyman-α photons increases with increasing energy from its threshold which is about 29 eV. The main precursor of the two H(2p) atoms is assigned to the doubly excited Q2 1Πu state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453943
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  • 4
    Electronic Resource
    Electronic Resource
    Rotational structure in the Hopfield series of N2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4471-4477 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Hopfield Rydberg series of 14N2 have been reinvestigated both at room temperature under equilibrium conditions and at a rotational temperature of ∼20 K in supersonically expanding nitrogen. High-resolution absorption spectra of the preionizing resonances in the region from 143 000 to 151 100 cm−1 have been recorded photographically as well as photoelectrically using, respectively, the 10.6 m vuv spectrograph of the National Research Council in Ottawa, Canada, and the 6.65 m scanning spectrometer at the Photon Factory synchrotron facility in Tsukuba, Japan. The photoelectric measurements have been reduced to absolute photoabsorption cross sections. The rotationally cold spectra show strikingly regular patterns of absorption peaks and window resonances that are accounted for, semiquantitatively, by the calculated total ionization cross sections for the nonrotating molecule [M. Raoult et al., J. Phys. B 16, 4601 (1983), and unpublished work by H. Le Rouzo and M. Raoult, quoted by C. H. Greene and Ch. Jungen, in Adv. At. Mol. Phys. 21, 51 (1985)]. The complexity of the room temperature spectra is rotationally induced; it does not call for an interpretation in terms of strong interactions with an unidentified perturber state as suggested by Baig and Connerade [J. Phys. B 19, L605 (1986)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465006
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  • 5
    Electronic Resource
    Electronic Resource
    Strong narrow-band electron cyclotron emission from a mirror plasma heated by electron cyclotron waves (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4923-4930 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strong electromagnetic radiation is observed in a narrow band slightly above the frequency of a heating wave that is absorbed by electrons near the electron cyclotron resonance layer in a magnetic beach. The frequency spectrum consists of a sharp component and a broad background, which is enhanced by more than 30 dB and 10 dB, respectively, above the radiation of thermal electrons. This observation is explained in terms of cyclotron radiation emitted by electrons, localized in a magnetic mirror, that are resonantly heated and bunched by a strong monochromatic wave. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322556
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  • 6
    Electronic Resource
    Electronic Resource
    Servomechanism for locking scanning tunneling microscope tip over surface nanostructures (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 420-423 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Measurement of the light emission spectrum from a scanning tunneling microscope (STM) requires a long exposure time due to its extremely low intensity, and thermal drift of the tip during the exposure time limits the spatial resolution. To improve the resolution, a computer controlled servomechanism that locks the STM tip over a target position has been developed. We have measured the light emission spectra from individual nanometer scale structures on an evaporated Au film with and without this mechanism, and demonstrated the effectiveness of the servomechanism. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150217
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  • 7
    Electronic Resource
    Electronic Resource
    Pinhole camera imaging of x rays and energetic neutral atoms for hot plasma diagnostics (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2574-2575 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact pinhole camera is found to be useful for observation of a spatial distribution of hot ions by imaging energetic charge-exchange neutral atoms. One can obtain images of neutral atoms and of x rays in the same geometry only by selecting filtering foils at the pinhole opening of a single camera. Easy comparison between the images associated with distributions of ions and electrons is quite beneficial for physical analyses of plasmas. The imaging technique is expected also to be useful to determine space–time-resolved energy spectra of hot ions. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148962
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  • 8
    Electronic Resource
    Electronic Resource
    The combination of a VUV Fourier-transform spectrometer and synchrotron radiation : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2122-2124 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Current research on the Earth's upper atmosphere requires molecular parameters of unprecedented detail and accuracy. For example, state-of-the-art models of the vacuum-ultraviolet (VUV) absorbing properties of the atmosphere call for absorption cross sections with details on the scale of the Doppler linewidths. As a consequence, spectroscopic data at resolving powers of the order of 106 are needed. Current particular needs are for ultra-high-resolution absorption cross-section data for some bands of NO and O2 in the 170–185 nm spectral region. To meet these requirements, an existing, portable, VUV Fourier-transform (FT) spectrometer will be moved to a synchrotron-radiation facility (Photon Factory, KEK, Japan) and VUV photoabsorption cross sections of NO and O2 will be measured. It has been demonstrated so far with emission line sources that the FT spectrometer will perform to ≤139 nm. Extension of work on absorption measurements to shorter wavelengths and with ultrahigh resolution requires an improved light source. Synchrotron radiation from a storage ring facility is the best alternative. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145747
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  • 9
    Electronic Resource
    Electronic Resource
    Pressure measurements with a precision of 0.001 ppm in magnetic fields at low temperatures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3215-3218 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Pressure measurements made by an ac bridge technique with a precision of 0.001 ppm in magnetic fields at low temperatures using a Straty–Adams type gauge are described. In order to improve the sensitivity and the long-term stability of the bridge system, coaxial cables without dielectric insulator were developed, with a small cable capacitance temperature coefficient of the impedance. This pressure measurement system has a sensitivity of dP/P∼5×10−10 and a long-term stability of dP/P∼2.4×10−9 over 18 h. This is especially useful for measurements such as electric and magnetic susceptibility measurements in magnetic fields at low temperatures requiring a high precision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144331
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  • 10
    Electronic Resource
    Electronic Resource
    Large-aperture TV detector with a beryllium-windowed image intensifier for x-ray diffraction : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2290-2294 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A large-aperture (150 mm and 230 mm in diameter) x-ray TV-type detector has been developed for x-ray diffraction with synchrotron radiation. The detector consists of a beryllium-windowed x-ray image intensifier, an optical lens, a charge coupled device (CCD) image sensor, and data acquisition system. The spatial resolution is 270 μm(FWHM), and the dynamic range is 6000:1. The noise level is quantum limited. The nonuniformity of response and image distortion is corrected by software. When a TV-rate (NTSC-mode) CCD is used as an image sensor, time-resolved measurements with a rate of 30 frame/s can be achieved with its noise quantum limited. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145667
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