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  • Electronic Resource  (30)
  • 1995-1999  (30)
  • 1
    Electronic Resource
    Electronic Resource
    Developmental and tissue-specific regulation of the gene for the wheat basic/leucine zipper protein HBP-1a(17) in transgenicArabidopsis plants (1995)
    Springer
    Molecular genetics and genomics 248 (1995), S. 573-582 
    Details
    ISSN: 1617-4623
    Keywords: Basic/leucine zipper protein ; HBP-1a(17) gene ; TransgenicArabidopsis ; Gene expression ; β-Glucuronidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Wheat basic/leucine zipper protein HBP-1a(17) binds in vitro specifically to ACGT motif-containing cis-acting elements, such as the type I element of plant histone promoters and the G-box of hormone- and light-inducible promoters. To address the in vivo function of HBP-1a(17), we isolated and structurally analyzed theHBP-1a(17) gene and examined its expression in transgenicArabidopsis plants. TheHBP-1a(17) gene is composed of 14 exons; the basic region and leucine zipper are encoded by separate small exons, as is the case for other bZIP protein genes. The G-box of theHBP-1a(17) promoter bound specifically to HBP-1a(17) and its related HBP-1a isoforms, suggesting that theHBP-1a(17) gene may be autoregulated, although the binding affinity of these proteins in vitro is very low. InArabidopsis plants, activation of theHBP-1a(17) promoter was highly restricted to photosynthetically active mesophyll, and guard cells and vascular bundles of vegetative leaves. Etiolation of transgenic plants resulted in inhibition of expression of theHBP-1a(17) promoter. Indeed, theHBP-1a(17) promoter contains several sequence elements homologous to cis-acting elements conserved in light-inducible promoters. It is, therefore, assumed that theHBP-1a(17) gene is light regulated and that HBP-1a(17) is involved in light-responsive gene transcription via the G-box.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02423453
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  • 2
    Electronic Resource
    Electronic Resource
    A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study (1999)
    Springer
    Annales geophysicae 17 (1999), S. 674-681 
    Details
    ISSN: 0992-7689
    Keywords: Magnetospheric physics (auroral phenomena; energetic particles, precipitating; MHD waves and instabilities)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An intensification of auroral luminosity referred to as an auroral break-up often accompanies the onset of geomagnetic pulsation (Pi 2) at the dip-equator. One such auroral break-up occurred at 2239 UT on 16 June, 1986, being accompanied by weak substorm activity (AE≈50 nT) which was recorded in all-sky image of Syowa Station, Antarctica (66.2°S, 71.8°E in geomagnetic coordinates). The associated Pi 2 magnetic pulsation was detected by a fluxgate magnetometer in the afternoon sector at the dip-equator (Huancayo, Peru; 1.44°N, 355.9° in geomagnetic coordinates; 12.1°S, 75.2°W in geographic coordinates; L = 1.00). In spite of the large separation of the two stations in longitude and latitude, the auroral break-up and subsequent luminosity modulation were seen to be correlated with the wave form of the ground Pi 2 pulsation. This occurred in such a way that the luminosity maximum was seen to occur at the phase of maximum amplitudes of Pi 2 wave form. We argue that the observed correlation could be interpreted as indicating a Pi 2-modulation of a field-aligned acceleration of the low energy electrons that may occur near the equator of the midnight magnetosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-0674-4
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  • 3
    Electronic Resource
    Electronic Resource
    Oculomotor sequence learning: a positron emission tomography study (1998)
    Springer
    Experimental brain research 122 (1998), S. 1-8 
    Details
    ISSN: 1432-1106
    Keywords: Key words Regional cerebral blood flow ; Pre-supplementary motor area ; Prefrontal ; Intraparietal ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The purpose of this study was to identify the brain regions activated in relation to oculomotor sequence learning. Nine healthy subjects participated in the study, which consisted of three positron emission tomography scans. In the initial learning task, subjects were instructed to track a sequence of seven successive positions of visual targets and to memorize the order of the targets as well as their spatial locations. In the saccade task, subjects were instructed to track visual targets presented at random locations. In the control task, subjects were instructed to gaze at a fixation point. Fields showing significant regional cerebral blood flow change were determined from task-minus-control subtraction images. We determined that fields in the pre-supplementary motor area (pre-SMA), the intraparietal cortex, and the prefrontal cortex were activated not only in the learning-minus-control images but also in the learning-minus-saccade images. Although prefrontal and parietal activations were bilateral, pre-SMA activation was confined to the left hemisphere. The results indicate that these fields function as a part of the neural network involved in the learning of sequential saccadic eye movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050485
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  • 4
    Electronic Resource
    Electronic Resource
    Streptococcus intermedius-brain abscess in chronic granulomatous disease (1999)
    Springer
    European journal of pediatrics 158 (1999), S. 872-873 
    Details
    ISSN: 1432-1076
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004310051231
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  • 5
    Electronic Resource
    Electronic Resource
    IgA nephropathy presenting clinicopathological features of acute post-streptococcal glomerulonephritis (1996)
    Springer
    European journal of pediatrics 155 (1996), S. 327-330 
    Details
    ISSN: 1432-1076
    Keywords: Key words Hypo-complementaemia ; Anti-streptolysin O ; IgA ; nephropathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 5-year-old Japanese girl was affected with acute nephritis. The patient had hypo-complementaemia and an elevation of anti-streptolysin O with positive throat culture of Group A streptococci. Four weeks after onset of the disease, serum complement level returned to normal, but proteinuria increased into the nephrotic range with a deterioration in renal function. Four weeks after onset, light microscopy of a renal biopsy showed diffuse endocapillary proliferation, and immunofluoroscopy revealed predominant IgA deposition in the mesangium. Electron microscopy showed electron dense deposits in the mesangial and subendothelial area, but subepithelial deposits were not found in the glomeruli. Histological diagnosis was IgA nephropathy, while her clinico-serological features were typical of acute post-streptococcal glomerulonephritis Conclusion These results suggest that in some patients, IgA nephropathy may be triggered by streptococcal infection and misdiagnosed as acute post-streptococcal glomerulonephritis if renal histological examinations are not done.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004310050410
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  • 6
    Electronic Resource
    Electronic Resource
    Dielectric relaxation of water and heavy water in the whole fluid phase (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 3026-3036 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recently we developed a new microwave spectroscopy technique in the frequency range up to 40 GHz, and measured the static dielectric constant and the dielectric relaxation time for supercritical water. In the present work we report the dielectric properties of heavy water at temperatures and pressures up to 770 K and 59 MPa, respectively. The static dielectric constant of D2O as well as H2O are well described by the Uematsu–Franck formula when the number density instead of the mass density is used as the input parameter. The dielectric relaxation time decreases rapidly with increasing temperature in liquid H2O and D2O and jumps to a large value at the liquid–gas transition. The relaxation time of D2O is longer than that of H2O in the liquid state, and the difference becomes smaller with decreasing density in the gaseous state. For both H2O and D2O the most relevant parameter determining the relaxation time is the temperature at high densities or at low temperatures, and it is the density at low densities or at high temperatures. Based upon the observation that the dielectric relaxation time becomes fairly long in the dilute limit, we have concluded that the dielectric relaxation in the gaseous state is governed by the binary collision of water molecules and explained the relaxation time quantitatively by the collision time. We have extended the interpretation of the dielectric relaxation to the liquid state by taking into account the contribution of bound water molecules that are incorporated in the hydrogen-bond network. Anomalous relaxation at low temperatures is also discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477897
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  • 7
    Electronic Resource
    Electronic Resource
    Microwave spectroscopy of supercritical water (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 9302-9311 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Microwave spectroscopy that can be applied to study the dielectric relaxation of various fluids under high temperature and pressure has been developed in the frequency range up to 40 GHz. By utilizing this new technique, the dielectric relaxation of water has been measured in the temperature and pressure range up to 750 °C and 120 MPa, which corresponds to a density range between 0.05 and 1 g/cm3. The static dielectric constant cursive-epsilon(0) is deduced from the time required for a microwave signal to travel through the sample by means of the time domain analysis, and is in good agreement with the literature. The dielectric relaxation time τ is obtained by fitting the experimentally observed microwave transmission rate to the value calculated using the S-matrices on the assumption that the dielectric constant obeys the Debye relaxation. The results of τ at ambient pressure agree very well with previous data. Below about 350 °C, τ rapidly decreases with increasing temperature nearly independent of pressure, while above about 350 °C, τ changes little with temperature and increases rapidly with decreasing density. It is concluded that the most relevant parameter determining τ is the temperature at lower temperatures or higher densities, and it is the density d at higher temperatures or lower densities. A possible change in the nature of hydrogen bonding is suggested to explain the observed temperature and density dependence of τ. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475226
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  • 8
    Electronic Resource
    Electronic Resource
    WHICH PATIENTS ARE SUITABLE FOR CONTINENT DIVERSION OR BLADDER SUBSTITUTION FOLLOWING CYSTECTOMY OR OTHER DEFINITIVE LOCAL TREATMENT? (1995)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of urology 2 (1995), S. 0 
    Details
    ISSN: 1442-2042
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-2042.1995.tb00483.x
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  • 9
    Electronic Resource
    Electronic Resource
    Histidinohydroxylysinonorleucine, a trifunctional cross-link of type I collagen, in sun-exposed and sun-protected human skin (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1997.tb01572.x
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  • 10
    Electronic Resource
    Electronic Resource
    Development of a two-dimensional space-resolved high speed sampling camera : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 625-628 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We developed a two-dimensional spatial resolved high-speed UV sampling camera (HISAC) to study energy transport in laser-produced plasmas. The HISAC is composed of an optical bundle of fibers coupled to a streak camera to obtain a two-dimensional spatial resolution with a temporal resolution of less than a few 10 ps. This HISAC system was demonstrated in the experiments on inferred uniformity measurements of laser-ablation pressures as well as on energy transport in ultraintense laser-plasma interactions. Two-dimensional shock heating was temporally resolved in a hemispherical target, resulting in the distribution of the ablation pressure as a function of laser incidence angle. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149383
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