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  • 1
    Electronic Resource
    Electronic Resource
    Stability of Lycopene Emulsions in Food Systems (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), 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 chemical stability of lycopene and the physical stability of lycopene emulsions diluted in 3 different food systems (skimmed milk, orange juice, and water as control) were studied. In these investigations, 3 different emulsifiers were used. It was found that lycopene stability strongly depends on the food system. In orange juice, lycopene is particularly stable. The emulsifiers used have only little influence on the stability of lycopene. Emulsions with α-tocopherol as an additional antioxidant showed a good lycopene stability in all food systems. Coalescence of oil droplets was not observed in any of the food systems investigated. Keywords: lycopene, stability, food systems
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2003.tb05796.x
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  • 2
    Electronic Resource
    Electronic Resource
    Processing and Mechanical Properties of Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 with Low Content of Additives (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 89-91 (Aug. 1993), p. 219-224 
    Details
    ISSN: 1013-9826
    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/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.89-91.219.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Structure Dependent Creep and Crack Propagation in Silicon Nitrides (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 89-91 (Aug. 1993), p. 599-604 
    Details
    ISSN: 1013-9826
    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/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.89-91.599.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Powder Modification on Sinterability, Microstructure and Properties of Si〈sub〉3〈/sub〉 N〈sub〉4〈/sub〉 (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 89-91 (Aug. 1993), p. 141-146 
    Details
    ISSN: 1013-9826
    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/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.89-91.141.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Gas Pressure Sintering of Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 in N〈sub〉2〈/sub〉/CO/(CO〈sub〉2〈/sub〉) Atmosphere (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 89-91 (Aug. 1993), p. 187-192 
    Details
    ISSN: 1013-9826
    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/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.89-91.187.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Biosynthesis of cobalamin (vitamin B12): a bacterial conundrum (2000)
    Springer
    Cellular and molecular life sciences 57 (2000), S. 1880-1893 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Cobalamin; vitamin B12; tetrapyrrole; precorrin; chelatase; pathway.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The biosynthesis of cobalamin (vitamin B12) is described, revealing how the concerted action of around 30 enzyme-mediated steps results in the synthesis of one of Nature's most structurally complex ‘small molecules’. The plethora of genome sequences has meant that bacteria capable of cobalamin synthesis can be easily identified and their biosynthetic genes compared. Whereas only a few years ago cobalamin synthesis was thought to occur by one of two routes, there are apparently a number of variations on these two pathways, where the major differences seem to be concerned with the process of ring contraction. A comparison of what is currently known about these pathways is presented. Finally, the process of cobalt chelation is discussed and the structure/function of the cobalt chelatase associated with the oxygen-independent pathway (CbiK) is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000670
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  • 7
    Electronic Resource
    Electronic Resource
    On the mechanism of the selective oxidation of methanol over elemental silver (1994)
    Springer
    Catalysis letters 28 (1994), S. 383-395 
    Details
    ISSN: 1572-879X
    Keywords: oxygen on silver ; methanol oxidation ; temperature-programmed reaction spectroscopy (TPRS) ; ion-molecule-reaction mass spectrometry (IMR-MS) ; dehydrogenation ; oxydehydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We analysed previously the interaction of silver with oxygen and characterised three different atomic oxygen species. The present communication uses TPRS data to assign a chemical function to each of these three species prepared on a sample of practical electrolytic silver particles. With stationary and instationary conversion experiments close to practical conditions we confirmed the conclusions from the TPRS data also to hold qualitatively for the stationary operating catalyst. Surface oxygen was found to react in an oxydehydrogenation reaction with adsorbed methanol with a significant selectivity to total oxidation. “Sub-surface” oxygen catalyses the dehydrogenation of the adsorbed methanol with no selectivity to total oxidation. Dissolved atomic oxygen from the bulk replenishes both surface species via “sub-surface” oxygen. The interconversion of all three species at the high reaction temperatures required to overcome the barriers for the formation and motion of the various atomic oxygen species limits the overall selectivity of the formaldehyde production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806069
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  • 8
    Electronic Resource
    Electronic Resource
    Charakterisierung von ZrO2-Y2O3-Pulvern mit der TEM/STEM-Punktanalyse (1990)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 21 (1990), S. 105-108 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: ZrO2-Y2O3-Pulver werden üblicherweise naßchemisch hergestellt und sind Voraussetzung zur Fertigung von TZP (Tetragonal Zirconia Polycrystals)-Keramiken. Die chemische Homogenität im Pulver ist notwendig, denn die Diffusionskoeffizienten der Komponenten und die Sintertemperatur sind niedrig, so daß Inhomogenitäten nicht vollständig ausgeglichen werden könnten.Mit Hilfe der STEM-Punktanalyse wurde der Y2O3-Gehalt an einzelnen Kristalliten oder Kristallitbereichen mit einer lateralen Auflösung von etwa 100 × 100 nm gemessen und als Verteilungskurven dargestellt. Die Messungen sind technisch und zeitlich sehr aufwendig, sie bieten aber als einzige Methode die Möglichkeit zur direkten Charakterisierung der chemischen Homogenität.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19900210303
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  • 9
    Electronic Resource
    Electronic Resource
    Electron probe microanalysis of chemical gradients in gas pressure sintered silicon nitride (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 349 (1994), S. 242-243 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract During gas pressure sintering of silicon nitride (Si3N4) — which normally contains oxide additives such as SiO2, Al2O3 and Y2O3 — in a resistance heated graphite furnace, a reduction of the Si3N4 sample takes place. At high temperatures (〉1800°C) this effect is accompanied by decomposition reactions of Si3N4. Both lead to chemical gradients in larger components which influence the strength of the sintered article. Electron probe microanalysis (EPMA) has been carried out in order to study the influence of the crucible material [graphite (C), boron nitride (BN)] and the quantity of filling on the gradient formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323297
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  • 10
    Electronic Resource
    Electronic Resource
    Insulin-like growth factor-I—Ein Bindeglied zwischen Ernährung und Wachstum (1992)
    Springer
    European journal of nutrition 31 (1992), S. 62-69 
    Details
    ISSN: 1436-6215
    Keywords: Insulin-like growth factor-I ; Ernährung ; Protein ; Öl ; Ratte ; Insulin-like growth factor-I ; nutrition ; protein ; oil ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The influence of an increasing protein supply in combination with soybean oil upon the IGF-I concentration in the serum in correlation with growth was measured on 8×10 male Wistar rats. With a casein content of 0 % in the food, the IGF-I level was 0.13±0.02 rU/ml. An IGF-I plateau of 0.74±0.07 rU/ml was reached at some 15 % casein. The additional application of 3 % soybean oil increased the IGF-I concentration significantly (P〈0.01) up to 0.95±0.16 rU/ml. The investigations show a specific increase of the IGF-I synthesis by the addition of oil, which is paralleled by a further stimulation of the growth of the rats. The nutrition-dependent IGF production in the peripheral tissues (mainly liver) represents the connection link between the growth hormone axis (genetically potential growth) and the growth realizable depending on the supply with nutrients.
    Notes: Zusammenfassung An 8×10 männlichen Wistar-Ratten wurde der Einfluß einer steigenden Proteinversorgung in Kombination mit Sojaöl auf die IGF-I-Konzentration im Serum in Korrelation zum Wachstum gemessen. Bei einem Caseingehalt von 0 % im Futter betrug der IGF-I-Spiegel 0,13±0,02 rU/ml. Ein Plateau wurde bei etwa 15 % Casein erreicht (0,74±0,07 rU/ml). Die zusätzliche Applikation von 3 % Sojaöl erhöhte die IGF-I-Konzentration signifikant (P〈0,01) auf 0,95±0,16 rU/ml. Die Untersuchungen zeigen eine spezifische Steigerung der IGF-I-Synthese durch die Ölzulage, der parallel eine weitere Stimulation des Wachstums der Ratten folgt. Die ernährungsabhängige IGF-Produktion in den peripheren Geweben (bes. Leber) stellt die Schaltstelle zwischen der Wachstumshormon-Achse (genetisch mögliches Wachstum) und dem in Abhängigkeit von der Nährstoffversorgung realisierbaren Wachstum dar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01612553
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