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  • 1
    Electronic Resource
    Electronic Resource
    An ethylene glycol derivative of boehmite (1988)
    s.l. : American Chemical Society
    Inorganic chemistry 27 (1988), S. 215-221 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00275a001
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  • 2
    Electronic Resource
    Electronic Resource
    Extended ElcB mechanism for ester hydrolysis: allylic substitution via carbanion in ester hydrolysis (1982)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 104 (1982), S. 1644-1653 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00370a033
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of Yttrium Aluminium Garnet Obtained by the Glycothermal Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 691-696 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: The reaction of a stoichiometric mixture of aluminium isopropoxide and yttrium acetate in1,4-butanediol (1,4-BG) at 300 ºC directly yielded crystalline yttrium aluminium garnet (YAG),while the reaction in ethylene glycol (EG) afforded an amorphous product in which a large amount ofEG moieties remained. The latter product exhibited an exothermic peak due to the crystallization ofYAG at around 900 ºC and single-phase YAG was obtained by calcination at 1000 ℃. The YAGsample directly obatained in 1,4-BG had a large unit cell parameter (12.144 Å), whereas the YAGsample obtained by the latter method had a unit cell parameter (12.015 Å) essentially identical withthe value (12.01 Å) reported in the JCPDS card. Rietveld analysis indicates that the former crystalshad Al vacancies at 24d sites and oxygen vacancies while the latter was essentially free from thesevacancies
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.691.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Pore Structure of Alumina Derived from the Alkyl Derivatives of Boehmite (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 2153-2158 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Solvothermal reaction of aluminum alkoxides in various alcohols at 250-300 oC yieldedalkyl derivatives of boehmite (alkoxyalumoxanes; AlO(OH)1-x(OR)x) in which alkyl groups wereincorporated between the boehmite layers through the covalent bondings. In the present work, poretextures of aluminas prepared by calcination of the products were examined. The alumina obtainedfrom the ethyl derivative of boehmite had a broad pore-size distribution, while the pore-size of thealumina obtained from the dodecyl derivative of boehmite distributed in a narrow range in themesopore region. The mode pore diameter of the latter alumina increased with the increase incalcination temperature (600 oC, 39 Å; 800 oC, 54 Å; 1000 oC, 74 Å), but narrow pore-sizedistribution was maintained even after calcination at high temperatures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.2153.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Carbon Nanotubes by the Catalytic Decomposition of Methane (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 48 (Oct. 2006), p. 67-72 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: The influence of morphology of the support particles upon the nickel-catalyzeddecomposition of methane into carbon nanotubes and hydrogen was explored using athermogravimetric apparatus. High carbon nanotube yield was attained by the Ni catalysts supportedon the glycothermally synthesized ZrO2 and Er3Ga5O12 particles, which had spherical shapes. Quitehigh carbon yield was also obtained by the Ni catalyst supported on spherical Al2O3 particles(Nanophase Tech. Corp.). It was concluded that the most important factor governing the carbon yieldis the morphology of the catalyst support, which contributes to the internal pressure of carbonnanotubes thus determining their chemical potentials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.48.67.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    EXAFS Study of Local Structures in Intercalation Compounds M〈sub〉x〈/sub〉TiS〈sub〉2〈/sub〉 (M (1992)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 91-93 (Jan. 1992), p. 603-608 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/21/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.91-93.603.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of steric effects upon the rate constants for competing BAC2 and E1cB ester hydrolyses (1983)
    s.l. : American Chemical Society
    The @journal of organic chemistry 48 (1983), S. 3559-3561 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00168a039
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  • 8
    Electronic Resource
    Electronic Resource
    Dendritic attenuation of synaptic potentials in the CA1 region of rat hippocampal slices detected with an optical method (2001)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 13 (2001), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We directly measured fast excitatory postsynaptic potentials (EPSPs) along the dendrites of hippocampal CA1 pyramidal neurons by employing an optical method to study how synaptic potentials spread along the dendrites. Rat hippocampal slices were stained with a fluorescent voltage-sensitive dye JPW1114 and optical signals were monitored with a 16 × 16 photodiode array system. A stimulating electrode was placed either at stratum lacunosum moleculare to activate perforant fibers that make synaptic contacts to the distal apical dendrites or at stratum oriens to induce EPSPs at the basal dendrites of CA1 pyramidal cells. CNQX-sensitive components of the optical signals, which were assumed to be population EPSPs, were isolated. Propagation and attenuation of the CNQX components were successfully observed with the optical method. At the cell body layer, the peak of the CNQX-sensitive component was delayed by 17.08 ± 1.64 ms from the input sites. Additionally we performed a simulation study to estimate the passive membrane parameters of the apical dendrites. Estimated apparent specific internal axial resistance (Ri) following stratum lacunosum moleculare stimulation was 76.0 ± 4.2 Ω·cm and apparent specific membrane resistance (Rm) was 27.8 ± 2.1 kΩ·cm2 (assuming the specific membrane capacitance of dendrites Cm = 1.6 µF/cm2). These values are comparable to those previously reported. When synaptic inputs were applied at stratum oriens, these apparent passive membrane parameters were different (high Ri and low Rm), suggesting that nonuniform dendritic membrane conductance or voltage-dependent conductances which are active near the resting potential may contribute to the measured passive membrane properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0953-816x.2001.01550.x
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  • 9
    Electronic Resource
    Electronic Resource
    Optical monitoring of progressive synchronization in dentate granule cells during population burst activities (2005)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 21 (2005), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Monitoring multiple neurons is essential for understanding neuronal network activities. While calcium imaging from a population of cells is an effective method to study the network dynamics of a neural structure, it has been difficult to image from densely packed structures, such as the granule cell layer of the dentate gyrus, due to overlap of the cells. We have developed a novel method to label multiple granule cells with a Ca2+ indicator in rat hippocampal slices using Oregon Green 488 BAPTA-1 (OGB-1) AM. Synchronized burst activities (0.3–1.4 Hz), which were induced by applying 50 µm 4-aminopyridine, were monitored extracellularly with a glass electrode placed at the granule cell layer in the dentate gyrus. During the burst activities, spontaneously occurring action potential-induced Ca2+ transients from multiple (4–12) granule cells were monitored with a cooled CCD camera with single-cell resolution. Temporal structures of firing patterns from the multiple neurons were determined from Ca2+ transients. In each single-burst-event recorded from the extracellular electrode, each neuron fired synchronously within a 200 ms time window. The latency and its variance from the onset time of the single-burst-events to one of the Ca2+ transients decreased over time (〈 7.5 min). These results indicate that the synchrony of the action potentials within a single-burst-event was enhanced as the burst activities proceeded. This progressive synchronization may be a key feature in making self-organizing neuronal networks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2005.04167.x
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  • 10
    Electronic Resource
    Electronic Resource
    Glutamate release increases during mossy-CA3 LTP but not during Schaffer-CA1 LTP (2004)
    Oxford, UK : Blackwell Science, Ltd
    European journal of neuroscience 19 (2004), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: It is still a matter of dispute whether the expression of hippocampal long-term potentiation (LTP) is due to enhanced transmitter release or enhanced postsynaptic sensitivity. Recently we developed a novel method to monitor synaptically released glutamate. In this method, brain slice preparations are stained with a voltage-sensitive dye RH155 which preferentially stains glial cells, and synaptically induced glial depolarization (SIGD) are optically detected in the presence of the blockers for ionotropic glutamate receptors. We have previously shown that SIGD is due to uptake of synaptically released glutamate by glial glutamate transporters. Here we applied this method to examine change in glutamate release during hippocampal LTP. To examine mossy-CA3 LTP, stimulating electrodes were placed in dentate gyrus and tetanic stimulation was delivered in the presence of 50 µm APV. The amplitude of SIGD after inducing LTP was significantly greater than that in control experiments in which tetanus was not delivered. The amplitude of SIGD after inducing LTP by a brief (3–5 min) application of 50 µm forskolin was also significantly greater than that in control experiments. At the Schaffer-CA1 synapse, the change in the amplitude of SIGD during LTP induced either by 100 Hz tetanus LTP or 200 Hz tetanus was not significantly greater than that of control experiments. These results provide evidence for increased glutamate release from the presynaptic terminals as the expression mechanism for both tetanus-induced and forskolin-induced LTP at mossy-CA3 synapses, and evidence supporting a postsynaptic expression mechanism at Schaffer-CA1 synapses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2004.03258.x
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