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  • Articles: DFG German National Licenses  (44)
  • 1990-1994  (30)
  • 1980-1984  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Enhanced Sensitivity of “Metabotropic” Glutamate Receptors After Induction of Long-Term Potentiation in Rat Hippocampus (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 57 (1991), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Stimulation of [3H]inositol monophosphate 〈[3H]InsP) formation by ibotenate or trans-1-aminocyclopentyl-l, 3-dicarboxylic acid (t-ACPD) in rat hippocampal slices was enhanced after tetanic stimulation of die Schaffer collaterals projecting to the CA1 region (in vitro) or the perforant pathway projecting to the dentate gyms (in freely moving animals). This effect was observed 5 h (but not 2 h) after long-term potentiation (LTP) induction and was abolished if tetanic stimulation was performed in the presence of specific antagonists of N-methyl-D-aspartate receptors. The delayed increase in excitatory amino acid-induced polyphosphoinositide (PPI) hydrolysis was accompanied by an enhanced responsiveness to norepinephrine, whereas the basal and carbamylcholine-stimulated [3H]InsP formation were unchanged. These results suggest that an increased activity of „metabotropic” glutamate receptors may contribute to the synaptic mechanisms enabling the late expression and or maintenance of LTP. Accordingly, LTP decayed more rapidly (within 5 h) in rats repeatedly injected with LiCl (60–120 mg/kg, i.p., for 10 days), a treatment that led to a reduced efficacy of ibotenate and norepinephrine in stimulating PPI hydrolysis in hippocampal slices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1991.tb03763.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Exotic states in the E–e Jahn–Teller problem (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4509-4517 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Fulton–Gouterman transformation is applied to the dynamical E–e Jahn–Teller problem. This approach leads to an unconventional way of visualizing the exact eigensolutions of the problem. It turns out that in the upper energy region, eigenfunctions with unexpected behavior make their appearance ("exotic states''). They practically have no distortion in the oscillatory subspace, whereas eigenfunctions of large radial oscillatory displacement are found in their immediate energetic neighborhood. In a rough way, these exotic states may be attached to the upper potential sheet of the "Mexican hat'' and furthermore they can be shown to be related to the "Slonczewski resonances.''
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462812
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurements and stability calculations of the disturbance growth in an unstable three-dimensional boundary layer (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2371-2377 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The amplification of disturbances developing under conditions of natural transition in the unstable three-dimensional boundary-layer flow on a swept-back flat plate is measured with the aid of hot-wire anemometry. A detailed analysis of the experimental data allows identification of the most amplified instability modes and determination of their growth rates. The results are compared with linear stability theory. Although the amplification process is affected by nonlinearities starting a short distance downstream of the positions where the disturbances become of measurable size, in some essential respects the applicability of linear theory can be examined. It turns out that the initial amplification rates of the stationary instability modes are fairly well predicted whereas the amplification rates of the nonstationary modes are overestimated. A remarkable feature is that the disturbances with the largest amplitudes are not, in every case, the most amplified ones in theory as well as in experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858176
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of ultrasonic instrumentation on microleakage in composite restorations with glass ionomer liners (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 19 (1992), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to determine the effect of ultrasonic instrumentation on composite resin restorations lined with glass ionomer cement by measuring the extent of dye penetration at the restoration/tooth interface. Preparations, 2-0 mm in diameter and 2-5 mm in depth, were made with a 331 bur in 96 human molar teeth without a bevel. The teeth were restored with glass ionomer eement liners (Shofu) and one of two types of composite resin (Silux® and P-30®). Half of the samples were ultrasonically instrumented for 10 s. The teeth were immersed in 0-5% methylene blue dye solution and vertieally sectioned. Mieroleakage was scored visually using a seale of 0 to 4. Statistical comparisons were made with X2 analysis and the Marin-Whitney U-test at the F〈0.05 level. Microleakage was significantly different between both resin types (P〈 0-001), and between the lined and unlined resins (P〈 0-001) that were instrumented, particularly in the P-30® restorations. Although P-30® restorations exhibited much less microleakage than Silux®, the use of a glass ionomer liner did not reliably reduce microleakage in either type of material after instrumentation with an ultrasonic device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1992.tb01587.x
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of Small-Angle Neutron Scattering Data on Poly(dimethylsiloxane) Network Unfolding (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 5223-5226 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00096a056
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  • 6
    Electronic Resource
    Electronic Resource
    Alkalides, Electrides, and Expanded Metals (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 23 (1993), S. 223-253 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.23.080193.001255
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular building block approaches to ceramic materials: tripolyphosphate cement (1991)
    s.l. : American Chemical Society
    Chemistry of materials 3 (1991), S. 5-6 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00013a002
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Packaging Film and Vacuum Level on Regular and Sorbate-Cured Bacon (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bacon was produced with either 40 ppm NaNO2/0.26% potassium sorbate, or 120 ppm NaNO2. Slices were packaged in either nylon/Surlyn or nylon/Saran/Surlyn pouches and sealed at either a high or intermediate vacuum level. At 0, 10, 21 and 28 days after packaging, residual nitrite, rancidity, pH, residual salt and pigment conversion were measured. Residual nitrite and pH were lower while nitrosopigment conversion was higher in bacon packaged with the high-barrier film. Vacuum level, however, had no effect on any measured characteristic. The sorbate/reduced nitrite cure resulted in lower pigment conversion, lower residual nitrite, and a higher TBA number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb10080.x
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  • 9
    Electronic Resource
    Electronic Resource
    Inhibition of Clostridium botulinum Growth from Spore Inocula in Media Containing Sodium Acid Pyrophosphate and Potassium Sorbate with or without added Sodium Chloride (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 49 (1984), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of sodium acid pyrophosphate (SAPP), sodium chloride (NaCl) and/or potassium sorbate (PS) on the growth from heat-activated spores of three individual strains or a mixture of ten strains of Clostridium botulinum in peptone-yeast extract-glucose broth at pH 5.55 or 5.85 were measured spectrophotometricalty at A630nm. Growth ratios (GR = treatment/control) based on time to reach A630= 0.35 or 0.04 were calculated and used to compare effects of additives on strains. SAPP, NaCl, PS, and pH exhibited independent significant main effects (p≦0.01) on delaying growth in most C. botulinum strains tested. Combinations of additives without NaCl consistently caused an increase in the GR and an increase in organism sensitivity to additives in the medium. Treatments containing SAPP (0.2 or 0.4%) and PS (0.13 or 0.26%) were more effective for delaying growth than other formulations tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1984.tb12850.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Sodium Acid Pyrophosphate in Combination with Sodium Nitrite or Sodium Nitrite/Potassium Sorbate on Clostridium botulinum Growth and Toxin Production in Beef/Pork Frankfurter Emulsions (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Combinations of sodium acid pyrophosphate (SAPP) with added sodium nitrite and/or potassium sorbate were tested at various pH levels to determine effectiveness in delaying Clostridium botulinum growth and toxin production in frankfurter emulsions. Formulations containing sodium nitrite (40 ppm), potassium sorbate (0.26%) and SAPP (0.4%) resulted in a greater delay of toxin production (12–18 days) than other combinations (6–12 days) having similar pH values. Treatments containing 0.4% SAPP appeared to be more inhibitory than their counterparts without SAPP, displaying less numbers of toxic samples during the 53-day storage period at 27°C. Aerobic mesophilic colony counts and residual nitrite data showed little difference among treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb14949.x
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