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  • Articles  (32)
  • 1990-1994  (26)
  • 1980-1984  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative infrared analysis of the stretching peak of SiO2 films deposited from tetraethoxysilane plasmas (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6876-6882 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Infrared transmission spectra of silicon dioxide (SiO2) thin films (∼4500 A(ring)) prepared by plasma-enhanced chemical-vapor deposition have been quantitatively analyzed. The films were deposited at different substrate temperatures (30–450 °C) using tetraethoxysilane (TEOS)/He, TEOS/He/O2, and TEOS/O2 gas mixtures in a parallel-plate radio-frequency reactor. The infrared transmission fits prove to be very accurate showing evidence of deconvolution into three separated Gaussian profiles to account for the asymmetric line-shape feature of the infrared stretching peak between 950 and 1300 cm−1. The examination of the Fourier transform infrared spectroscopy spectra in the complete frequency range (400–4000 cm−1) and ex situ x-ray photoelectron spectroscopy spectra indicates that some extra structures originate from the incorporation of carbon and hydrogen impurities in the film. As the substrate deposition temperature is increased, impurities are gradually removed from the growing layer. Films deposited at high substrate temperatures reveal a better stoichiometry and present similar deconvolution bands regardless of the gas-phase composition; the corresponding frequencies are shifted to lower energies compared to thermal oxides. In addition, the intensity of the first Gaussian profile, associated with the low-energy asymmetry of the stretching peak, increases with the substrate deposition temperature while the intensity of the third Gaussian profile associated with the presence of the high-energy peak shoulder decreases. The vibrational properties of the film seem to be strongly related to the deposition conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355090
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical Evidence of .pi.-Dimerization with Short Thiophene Oligomers (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 1549-1555 
    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/cm00045a012
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  • 3
    Electronic Resource
    Electronic Resource
    Catecholamine Release from Adrenal Gland Evoked by Lithium (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 639 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb17365.x
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  • 4
    Electronic Resource
    Electronic Resource
    Lactobacillus plantarum survival in aerobic., directly brined olives (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 59 (1994), 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: Storage at 20°improved Lactobacillus plantarum survival in directly brined olives. The best inoculation dates were on the first and fifth days after brining for Cacereña and Hojiblanca cultivars respectively. Lb. plantarum was present throughout the storage period only in Hojiblanca olives covered with initial free-salt solution and inoculated on the fifth day. In the presence of that bacterium, titratable acidity (0.5-1%) and pH (〈4.0) reached proper values for olive preservation. Yeast populations, consisting of Pichia membranaefaciens and Pichia fermentans, in Hojiblanca, and Pichia minuta, Pichia fermentans, Pichia membranaefaciens, and Rodotorula spp, in Cacereña, were found in all treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1994.tb14675.x
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  • 5
    Electronic Resource
    Electronic Resource
    Concentration of Phenolic Compounds Change in Storage Brines of Ripe Olives (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), 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 cultivar, salt concentration and temperature on changes in phenolic compounds during storage of ripe olives were studied, using a 23 factorial design. The effect of salt was negligible. Higher temperature increased phenols diffusion rate into brines for two cultivars assayed. The cultivars, Hojiblanca and Cacereña varied in poly-phenol content. Throughout storage there was hydrolysis of glucosides intially in flesh (oleuropein, verbascoside and luteolin 7-glucoside due to the acidic conditions. This effect caused the content of oleuropein in brines to always be lower than 1.5 mM and resulted in a continous increase in level of hydroxytyrosol
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb04272.x
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  • 6
    Electronic Resource
    Electronic Resource
    Topography of the shield volcano, Olympus Mons on Mars (1984)
    [s.l.] : Nature Publishing Group
    Nature 309 (1984), S. 432-435 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The contour map of Olympus Mons was compiled at a scale of 1:1,000,000 with a contour interval of 200 m, using 91 stereoscopic models of Viking Orbiter photographs2. Special photo-grammetric techniques were used for this compilation. These techniques had been developed to use the Viking Orbiter ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/309432a0
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of antiserum against the pneumococcal autolysin—inhibition of autolysin activity and some autolytic processes by the antibody (1982)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 14 (1982), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1982.tb08649.x
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  • 8
    Electronic Resource
    Electronic Resource
    Quasipermanent hole-photorefractive and photochromic effects in Bi12TiO20 crystals (1992)
    Springer
    Applied physics 55 (1992), S. 49-54 
    Details
    ISSN: 1432-0630
    Keywords: 42.40 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We report the presence of quasipermanent effects of photochromic and hole-photorefractive nature in Bi12TiO20 (BTO) at low irradiance at 514.5 nm. A new selective two-wave mixing (S2WM) detection technique was used that allows to separately detect phase and amplitude gratings. S2WM is used in this work for operating a self-stabilized recording setup which allows to produce unusually large quasipermanent effects. We also show that stabilized recording is necessary to obtain reliable information from hologram erasure experiments. Results reported in this paper show the complex nature of recording in BTO and the capabilities of stabilized recording and S2WM for fundamental and applied research on photorefractive crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324601
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  • 9
    Electronic Resource
    Electronic Resource
    Glow discharge deposition of silicon dioxide and aluminum oxide films: A kinetic model of the surface processes (1990)
    Springer
    Plasma chemistry and plasma processing 10 (1990), S. 247-260 
    Details
    ISSN: 1572-8986
    Keywords: Plasma deposition ; thin film ; aluminum oxide ; silicon oxide ; kinetic model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Silicon oxide films have been deposited in a RF discharge plasma using hexamethyl-disiloxane (HMDSO) and Ar/O2 or N2O. Also, aluminum oxide layers have been deposited using trimethylaluminum (TMA) and N2O or CO2. The influence of the nature and the proportion q( the oxidizing gases and file suhstrate temperature effect have been studied. As far as the films obtained with HMDSO and TMA tire concerned, the most important experimental finding is the decrease of the deposition rate with increasing substrate temperature. FTIR, ESCA, and refractive index measurements show that the decrease of the deposition rate correlates with a nearly stoichiometric film. Low negative apparent activation energies are deduced from Arrhenius plots and are representative of deposition rates controlled hr fire adsorption of radical and surface di fusivities. A kinetic rnodel shows that the rate-limiting step is the adsorption of HMDSO or TMA radicals at low temperatures while for temperatures above 250°C the oxidation reactions control the deposition rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447129
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  • 10
    Electronic Resource
    Electronic Resource
    The chromosomal location of factors determining the presence of phenolic compounds in wheat (Triticum aestivum L.) (1982)
    Springer
    Theoretical and applied genetics 61 (1982), S. 125-128 
    Details
    ISSN: 1432-2242
    Keywords: Triticum aestivum ; Wheat-phenolics-location
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using thin-layer chromatography and nulli-tetrasomic and ditellosomic series of Triticum aestivum L. cv. ‘Chinese Spring’, it has been possible to relate the phenolic compounds found in adult plant leaves and 12 day-old seedling leaves with the chromosomes or chromosome arms 1 B, 2 BL, 3 BL, 5 A, 6 AL, 7 B and 7 DS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00273879
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