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  • 1
    Electronic Resource
    Electronic Resource
    Light-emission phenomena from porous silicon: Siloxene compounds and quantum size effect (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 8060-8065 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It has long been argued whether the luminescent mechanism of anodized porous silicon is mainly due to the chemical compounds such as siloxene derivatives, or the quantum size effect. We performed a comprehensive study using atomic force microscope, infrared transmission, Raman scattering, and photoluminescence measurements in terms of various annealing temperatures. Low - temperature photoluminescence spectra have also been observed. This leads us to conclude that not only the siloxene derivatives but also the quantum size effect gives the luminescence in porous silicon. The previous pseudopotential calculations are used for the explanation of our experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356547
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation of optical and structural properties of light emitting porous silicon (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 855-857 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Microscopic structures of light emitting porous silicon layers have been studied. The samples prepared in an aqueous HF solution by anodizing p-type silicon substrates show a strong positional dependence of photoluminescence and Raman spectra. The photoluminescence peaks are broad around 1.8 eV, where the photoluminescence intensities are comparable to that of GaAs at 5 K. We have found from Raman studies showing two characteristic peaks at 500 and 520 cm−1 that microscopic structures reveal gradual changes from porous silicon to a mixture of polycrystalline and hydrogenated amorphous phases as the probing spot is moved to the edge of the sample. This is explained by the redeposition of silicon atoms on top of the porous silicon layers near the edge of the sample as a result of liquid flow caused by bubbles of hydrogen gas which was produced near the surface of the sample during the anodization process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109605
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  • 3
    Electronic Resource
    Electronic Resource
    Photoluminescence, Raman scattering, and infrared absorption studies of porous silicon (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1812-1814 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Porous silicon layers prepared by anodic dissolutions of silicon wafers in aqueous HF solutions reveal either crystalline phase or intermediate phase between microcrystalline and amorphous phases, depending on the anodization conditions. The configurations of hydrogen and oxygen atoms near the surface of microstructures are directly related to the light emitting characteristics of porous silicon layers. We observed that oxidation leads to the shifts of SiHn stretching modes to higher frequencies and enhanced photoluminescence intensity, which can be correlated with a charge transfer within O—Si—H bonds. We also observed that chemical treatments in trichloroethylene have similar effects as thermal oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109557
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  • 4
    Electronic Resource
    Electronic Resource
    Room-temperature visible photoluminescence from silicon-rich oxide layers deposited by an electron cyclotron resonance plasma source (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3908-3910 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly split, visible light emissions at room temperature were observed in the range from 335 to 650 nm in silicon-rich oxide films deposited in the plasma phase of a mixture of silane and oxygen. The mechanism of the light emissions is classified into two categories. The photoluminescence bands at both 365 and 469 nm are related to the intrinsic defects of the E′ center and the neutral oxygen vacancy, respectively. However, the relatively sharp peaks at 403 and 535 nm are correlated with the development of polycrystalline core of Si-enriched parts. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117566
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  • 5
    Electronic Resource
    Electronic Resource
    Solubilities of 2,4-dichloro-1-naphthol in supercritical carbon dioxide
    Amsterdam : Elsevier
    The @Journal of Chemical Thermodynamics 25 (1993), S. 193-196 
    Details
    ISSN: 0021-9614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jcht.1993.1017
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  • 6
    Electronic Resource
    Electronic Resource
    Changes of Calbindin D-28k Immunoreactivity in the Hippocampus after Adrenalectomy in the Seizure Sensitive Gerbil (2004)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 33 (2004), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Calbindin D-28k (CB), a calcium-binding protein, containing neurons in the hippocampus plays an important role in hippocampal excitability in epilepsy. In the present study, we investigated changes of CB immunoreactivity after adrenalectomy (ADX) in the hippocampus and dentate gyrus of the seizure sensitive gerbil, which is susceptible to seizure to identify roles of CB in epileptogenesis. The changes of the CB immunoreactivity after ADX were significant in the hippocampal CA1 region. By 24 h after ADX, CB-immunoreactive CA1 pyramidal cells and CB immunoreactivity increased. At this time, well-stained dendrites projected to the stratum radiatum. Thereafter, the CB immunoreactivity decreased time dependently by 96 h after ADX. In the dentate gyrus, the changes of CB-immunoreactive neurons were mainly observed in the granule cell layer. The number and immunoreactivity of CB-immunoreactive neurons was high at 24 h after ADX, thereafter, those decreased by 96 h after ADX. These results suggest that glucocorticoid has an important role in modulating the seizure activity and CB serves an inhibitory function, which regulates the seizure activity and output signals from the hippocampus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2004.00554.x
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  • 7
    Electronic Resource
    Electronic Resource
    Histochemical Study on Neurodegeneration in the Olfactory Bulb after Transient Forebrain Ischaemia in the Mongolian Gerbil (2004)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 33 (2004), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In the present study, we investigated the ischaemia-related neurodegeneration in the main and accessory olfactory bulb (AOB) after 5 min transient forebrain ischaemia in the Mongolian gerbil using the acid fuchsin staining method. Between 5 and 15 days after ischaemia, acid fuchsin positive cells markedly increased in the external plexiform layer (EPL), mitral cell layer (ML) and glomerular layer (GL) of the main olfactory bulb (MOB), and in the mixed cell layer (MCL) and GL of the AOB. By 30 days after ischaemia reperfusion, acid fuchsin positive neurons were shrunken and showed low acidophilia in somata. Many necrotic vacuoles were found in the EPL and GL of the MOB 30 days after ischaemia. At this time, necrotic vacuoles were very few in the AOB. Therefore, our results suggest that the GL and EPL of the MOB are vulnerable to ischaemic damage at a later time after ischaemic insult, and that the AOB is more resistant to ischaemic damage as compared with the MOB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2004.00538.x
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  • 8
    Electronic Resource
    Electronic Resource
    Chronological Alterations of P2X3 Receptor Expression in the Trigeminal Ganglion after Ischaemic Insult in the Mongolian Gerbil (2004)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 33 (2004), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: P2X receptors play a role in the transduction of sensory signals like pain. Few studies have been undertaken on altered P2X3 receptor (P2X3) expression in sensory neurones after peripheral nerve injury. In the present study, we investigated chronological alterations in P2X3 immunoreactivity and its protein content in the trigeminal ganglion after ischaemic insult in the Mongolian gerbil. In the sham-operated group, P2X3-immunoreactive neurones were found abundantly in small- and medium-sized neurones. From 1 day after ischaemic insult, the number of P2X3-immunoreactive neurones decreased significantly. At 5 days after ischaemic insult, P2X3 immunoreactivity was observed in few neurones, but its immunoreactivity was weak. However, the number of cresyl violet-positive neurones was unchanged throughout this period in all groups. These results suggest that transient trigeminal ganglion ischaemia may provoke a decrease of P2X3 expression and its protein content, and that this down-regulation of P2X3 may be related to the altered pain and thermal sensation without being associated with a transient ischaemic insult.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2004.00540.x
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  • 9
    Electronic Resource
    Electronic Resource
    Simultaneous determination of losartan and active metabolite EXP3174 in rat plasma by HPLC with column switching (1996)
    Springer
    Chromatographia 42 (1996), S. 39-42 
    Details
    ISSN: 1612-1112
    Keywords: Column Liquid chromatography ; Column-switching ; Losartan and EXP3174 in plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new liquid chromatographic method with columnswitching has been developed for the simultaneous determination of losartan and its active metabolite, EXP3174 in rat plasma. The plasma samaple was injected onto a precolumn of Lichroprep RP-8 after dilution with 5% acetonitrile in 50 mM phosphoric acid. Polar plasma components were eluted using this diluent. After valve switching, the concentrated drugs were eluted in the back-flush mode and separated by an Inertsil ODS-2 column with acetonitrile-acetate buffer. The method showed excellent precision, accuracy and speed with detection limit 20 ng mL−1. Total analysis time per sample was less than 40 min and the coefficients of variation for intra and inter-assay were 4.8%. This method has been successfully applied after oral administration of losartan to rat plasma samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271053
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal Property Measurements and Enthalpy Calculation of the Lithium Bromide+Lithium Iodide+1,3-Propanediol+Water System (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 1407-1418 
    Details
    ISSN: 1572-9567
    Keywords: absorption chiller ; enthalpy ; heat capacity ; heat of dilution ; LiBr/LiI/1,3-propanediol/water system ; working fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lithium bromide+lithium iodide+1,3-propanediol+water [LiBr/LiI mole ratio=4 and (LiBr+LiI)/HO(CH2)3 OH mass ratio=4] solution is being considered as a potential working fluid for an absorption chiller. Heat capacities at four temperatures, 283.15, 298.15, 313.15, and 333.15 K, were measured in the range from 50 to 70 mass%. In addition, the differential heats of dilution at 298.15 K were measured in the range from 45.3 to 71.8 mass%. Each individual data set was correlated with a proper regression equation with a high accuracy. A new enthalpy calculation method for the working fluids containing organics was proposed. The calculation method correlated the heat capacity (at various temperatures and concentrations) and the differential heat of dilution (at ambient temperature and various concentrations). The present method was applied for the construction of enthalpy–concentration (H–T–X) diagrams with high confidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006609527700
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