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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 46 (1981), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Biochemical studies were carried out on two widely distributed Egyptian onion varieties (Behairy and Selected Giza 6). Several treatments (soaking in tap water, boiling water, cold water, warm ethanol, or sodium chloride solution) were proposed to overcome onion reddening during industrial processing. Some chemical characteristics (L-ascorbic acid, free amino acids, volatile sulfur compounds, carbonyl compounds, pungency and color) were determined in fresh, treated and stored sliced onions. Unsaturated fatty acids can be considered as a secondary source for carbonyl compounds and are involved in the formation of red pigments. Pronounced changes among hydrocarbons and little changes in sterols were due to application of various treatments and storage. In general, the most efficient treatments towards keeping onion quality were soaking the sliced onions in cold water or 5% (w/v) sodium chloride for 24 hr before onion dehydration.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 18 (1975), S. 451-456 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Im Labor gezogene Männchen von P. gossypiella wurden mit 32P gefüttert, um Ausbreitung und Paarung im Baumwollfeld zu studieren. Freigelassene Falter, teils bestrahlt mit 20 Krad, teils unbestrahlt, wurden vorwiegend innerhalb von 100 m von der Freilassungsstelle gefunden. Vor Bildung eines geschlossenen Bestandes waren die Tagesruheplätze der Falter Bodenspalten and der Basis der Pflanzen. Später, wenn ein schützender, dichter Pflanzenbestand gebildet war, hatten die Falter ihre Ruheplätze etwa zur Hälfte in dem unteren Bereich des Pflanzenbestandes, davon viele in verwelkten Blüten. Zwischen freigelassenen Männchen und Freilandweibchen kam es nur zu wenig Paarungen, wahrscheinlich wegen des zahlenmässigen Übergewichts der Freilandmännchen im Gebiet. Die Technik der Autoradiographie von Freilandweibchen zur Erkennung einer Paarung mit freigelassenen, markierten Männchen war einfach und wirkungsvoll.
    Notes: Abstract Radioactive phosphorus was fed to laboratory-reared male pink bolloworms, Pectinophora gossypiella (Saunders), for studies of dispersal and mating in the field. Released moths either irradiated with 20 Krad or unirradiated, were found predominantly within a few hundred meters of the release points. Prior to formation of a plant canopy, daytime-resting places of moths were soil crevices at the bases of the plants. Later, when a protective plant canopy had formed, about half of the moths took resting places in the lower canopy, many in withered blooms. Little mating occurred between released males and native females, probably due to the great preponderance of native males in the test area. The technique of autoradiography of native females to determine mating with released labeled males was simple and effective.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 42 (1988), S. 1195-1198 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The clinker raw mixture (84 wt % limestone + 12 wt % clay +4 wt% pyrite ash) was divided into five portions. Each portion was mixed with an alkali carbonate and fired at a certain temperature along half an hour then quenched in air. A portion was left without alkali and fired at 1450°C to investigate the effect of alkali addition. Each portion was ground and refired at a temperature less than the first firing by about 100°C for ten hours to ensure that the cliniker had been fully formed, then quenched in air. Each clinker was measured by Mössbauer spectrometer and x-ray diffractometer. Each clinker was mixed with 5 wt% natural gypsum then with 25 wt% water. The compressive stength test was performed at three days of hydration. The results were compared with the results of ordinary Portland cement.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 3 (1984), S. 88-90 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 3 (1984), S. 262-264 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 28 (1986), S. 843-847 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This work deals with the application of Mossbauer Effect (ME) in studying the crystal electric field and the cation distribution among tetrahedral (A) and the octahedral (B) sites of the spinal structure in the ferrite system Cdx Mg1−x Fe2O4 (x=0, 0.2,...1). The electron spin resonance technique (ESR) was also applied for studying this ferrite system. It was possible to characterize the ESR spectra of ferrite through the combination with the ME spectra. The ESR spectra of magnesium ferrite showed two resonance positions of Fe3+ ions and indicated that a strong exchange interaction is dominant in the pure Mg-ferrite. For high Cd concentration ferrites only single resonance line was observed. These results could be interpretted on the basis of the ME results where it indicated that Cd2+ ions prefer tetrahedral positions, forcing the Fe3+ ions from these positions to join those in the octahedral sites. The complete site occupation with different types of cations was successfully achieved from the ME spectra. The values of the quadrupole splitting indicated that for each ferrite in the system there exists an electric field gradient surrounding the Fe3+ ions in each of the octahedral and tetrahedral sites. The increase in the Mg-concentration increases the symmetry of the electric field at these sites.
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  • 7
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer and ESR measurements were performed on vanadium borophosphate glasses containing iron. The glass composition was 78 mole% V2O5, 15 mole% P2O5, 7 mole% B2O3 and different amounts of Fe2O3 (0.5–50 mole%) were added. The relative percentage of iron in different states and site positions could be determined for each glass composition. Correlation between the behaviour of iron and its variation in structural units and other physical properties are proposed. A maximum amount of 33 mole% Fe2O3 could be incorporated in the glass network, higher concentrations lead to the precipitation of α-Fe2O3.
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  • 8
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In our previous work /1/, the behaviour of iron addition to vanadium borophosphate (V. B. P.) glasses (78 mole% V2O5, 15 mole% P2O5, 7 mole% B2O3 and x mole% Fe2O3 where (0.5≤x≤50) was investigated by (ME) and (ESR) techniques. In the present work, the investigations were extended to study the effect of heat treatment (H. T) on the same system (up to x=7.5 mole% Fe2O3). The results obtained showed that heating these glasses at the glass transition temperature (Tg=350°C) for different periods up to 120 min. highly affected their structural units and magnetic properties. The extent of this effect depends on the iron content as well as on the H. T period.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 29 (1986), S. 1483-1486 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A heavy type concrete for nuclear reactor shield prepared by adding to the portland cement Egyptian iron ores has been studied. This concrete contains heavy elements and a large amount of water of crystallization that make it more effective than ordinary concrete for neutron and gamma attenuation. The measurement of the Mössbauer parameters allows a deeper understanding of the relations between attenuation and physical properties.
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  • 10
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectroscopy was used to study the effect of gamma irradiation and heat treatment on montmorillonite. Samples were irradiated to gamma-ray doses ranging from 10 Gy up to 30 MGy. Other samples were heated to different temperatures from 400
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