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  • Polymer and Materials Science  (7)
  • Kupferschiefer  (2)
  • wheat  (2)
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  • 1
    ISSN: 1573-5028
    Keywords: male sterility ; ovary ; parthenogenetic lines ; pollen allergen ; subtractive hybridization ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To isolate genes specifically expressed at the initiation of plant embryo development we have applied a sensitive subtractive hybridization technique for three isogenic wheat lines of the so-called ‘Salmon system’ with either zygotic or autonomous embryo development. Here we present a gene sequence showing a high homology to grass pollen allergens of type II/III thought to be expressed in pollen tissue only. Surprisingly, the pollen allergen-like sequence, designated Tri a III, is also expressed in gynoecia of the sexual, male fertile wheat line ‘(aestivum)-Salmon’, whereas the two parthenogenetic and male sterile wheat lines ‘(caudata)-Salmon’ and ‘(kotschyi)-Salmon’ completely lack any Tri a III transcript. Our data suggest a positive correlation between the expression of this clone and the manifestation of male fertility. Northern and in situ hybridization analysis revealed that, in addition to its presence in pollen, Tri a III is expressed in the parenchymatous tissue of ‘(aestivum)-Salmon’ ovaries exclusively at the day of anthesis. This precise temporal and spatial expression pattern suggests a more general function of the pollen allergen-like sequence Tri a III not limited to the exhibition of allergens in pollen grains.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mycopathologia 121 (1993), S. 115-121 
    ISSN: 1573-0832
    Keywords: Fusarium toxins ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Wheat for feed use (84 samples) was collected after harvest from 79 farms in a southwestern part of Germany (Baden-Wuerttemberg). The 1987 crop year was characterized by heavy rainfall in the summer months. The internal mycoflora of wheat samples was primarily fusaria, and storage fungi were rarely present. TheFusarium toxins, zearalenone (ZON), α- and β-zearalenol (α,β-ZOL), deoxynivalenol (DON), 3-acetyldeoxynivalenol (3-AcDON), nivalenol (NIV), T-2 Toxin (T-2), HT-2 toxin (HT-2) and diacetoxyscirpenol (DAS) were analysed by gas chromatography with mass selective detection (detection limit: 1–3 µg/kg). Each of the samples contained at least one of theFusarium toxins examined except DAS. DON, ZON, 3-AcDON, NIV, T-2, HT-2 and α-ZOL were detected in 96%, 80%, 59%, 26%, 26%, 7% and 5% of samples, with an average of 1632, 178, 7, 9, 82, 10 and 23 µg/kg, and a maximum of 20538, 8036, 18, 32, 249, 20 and 71 µg/kg, respectively. β-ZOL (12 µg/kg) was found in one sample with α-ZOL (71 µg/kg). One, two, three, four, five and sixFusarium toxins were detected in 6%, 27%, 37%, 23%, 4%, and 4% of total samples, respectively. The most frequent combination was that of ZON with DON and 3-AcDON, followed by the combinations ZON/DON and ZON/DON/3-AcDON/NIV in 22, 20, and 11% of total samples, respectively.
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  • 3
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis, characterization and liquid-crystalline (LC) properties of polysiloxanes containing side chains with terminal 2-fluorenyl groups and various lengths of spacers is reported. The polymers which have no flexible tail segment exhibit two smectic mesophases (SA and SE), as confirmed by polarizing microscopy, differential scanning calorimetry (DSC) and X-ray investigations; a nematic mesophase was not found. The clearing temperatures of the polymers (in the range between 120 and 170°C) are generally 70-80°C higher than the melting temperatures of the non-liquid-crystalline precursors with a terminal vinyl group. With increasing spacer length the less ordered SA phase is favoured and has been found in a temperature range of up to 100 K width. For polymers with an SE phase no glass transition was detectable with DSC. The synthesized polymers are examples of the strong potential of the fluorene core to form LC phases without further structural stabilization.
    Additional Material: 3 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 3107-3113 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis of the liquid-crystalline polysiloxanes, 4a, 4b, 5a, 5b with 2,7-disubstituted fluorene units and of the related liquid-crystalline model compounds 2 and 3 is reported. Polymers 4a, 4b, 5a, 5b were prepared from monomers 2 and 3, respectively, and poly(hydrogenmethyl-siloxane) (PHMS) in a polymer-analogous reaction. The liquid-crystalline properties of the polymers and the corresponding low-molecular-weight compounds 2 and 3 were characterized by differential scanning calorimetry (DSC) and polarizing microscopy. Both compounds 2 and 3 show a smectic A and a smectic E mesophase, and the resulting polysiloxanes also exhibit smectic A- and smectic E-like textures but no nematic phase. The clearing point of the polymers is on the average by 100°C higher than that found for the low-molecular-weight compounds.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 2785-2797 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Isopropyl acrylate-2,3-14C and isopropyl acrylate-2,3-3H were polymerized using anionic initiators. The isotactic polymers were fractionated by fractional precipitation and characterized. The polymer fractions were hydrolysed to polyacrylic acids by trifluoroacetic acid. Aqueous solutions of these radioactive labelled polyacrylic acids were injected intravenously to mice in amounts of 40 to 100mg/kg. Distribution in organs and the excretion were studied. About two thirds of the dose were excreted within the first two days with a half-life of about 0,5 days. Further excretion took place with a half-life of about six weeks. Distribution in the organism was not uniform; the highest concentrations were found in spleen, bones, and liver, i.e. organs being parts of the reticuloendothelial system. A relationship between organ concentration and molecular weight of the polyacrylic acid was only observed in the spleen. Nine weeks after injection about 10% of the dose were still retained in the organism, mainly in the skeleton.
    Additional Material: 8 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 61 (1989), S. 963-964 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
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  • 8
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Aqueous dispersion of nearly monodisperse charged polymer spheres of 250 nm diameter have been investigated in steady and oszillatory shear flow. Polydisperse latices were included for comparison. By using different types of rotational rheometers and a capillary viscometer viscosity measurements could be performed over a shear stress range from 10-3 Pa to 105 Pa.At shear stresses below 10-2 Pa the viscosity is independent of the shear rate but strongly increases with qrowing volume fraction φ. In the stress range of 0.1 to 10 Pa a transition to a lower viscosity level is observed. For φ≲0.2 this transition is negligible and the dispersion behaves Newtonian. The viscosity decrease (shear-thinning behaviour) becomes significant at higher volume fractions and reaches a magnitude of more than 3 decades for φ = 0.50. Polydispersity increases the viscosity level at small stresses. The latter is also increased by growing particle charge (higher pH-value) but reduced by the addition of NaCl (screening of the charge). For volume fractions φ ≲0.4 shear-thickening is found up to a viscosity maximum. The maqnitude of shear-thickening can be reduced by addition of NaOH (increase of particle charge) and broadening of the particle size distribution.The concentrated dispersions behave viscoelastic. They show an instantanious elastic deformation at the onset of shear creep tests and exhibit recoverable strains after unloading. In oscillatory shear the storage modulus approaches a constant value with decreasing angular frequency indicating the formation of a three-dimensional lattice structure.
    Additional Material: 15 Ill.
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  • 9
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The total of carboxyl and hydroxyl end groups of polyethyleneterephthalates (PET) prepared in different ways has been determined by a deuteration method. By means of a density gradient tube the composition of the heavy water has been analysed which is in exchange equilibrium with the PET sample. Simultaneous viscosity measurements of solutions in phenol tetrachlorethane, 1 : 1 (by weight) at 20°C. resulted in the following molecular weight viscosity relationship of unfractionated products \documentclass{article}\pagestyle{empty}\begin{document}$$\left[ {\rm \eta} \right] = 7.55 \cdot 10^{- 4} \cdot \bar {\rm M}_{n^{0,685} };\ 3000 \le \bar {\rm M}_n \le 30,000.$$\end{document} allowance being made for the content of methylester end groups in the end group analysis.Fractionation in the phenol cyclohexane system at 70°C. showed that the products tested had a “normal distribution”. In conformity with this, molecular weights have been found for fractions up to 1.85 times heavier than for not fractionated samples having the same solution viscosity.The equiLbrium constant of the polycondensation was found to be independent of the molecular weight (range tested 400 ≤ M̄n ≤ 3000).
    Notes: Die Summe von Carboxyl- und Hydroxyl-Endgruppen sehr verschiedenartig hergestellter Polyäthylenterephthalate (PET) wurde durch eine Deuterierungsmethode bestimmt. Es wurde dabei mit Hilfe eines Dichtegradientenrohres die Zusammensetzung von schwerem Wasser analysiert, das sich im Austauschgleichgewicht mit der PET-Probe befindet. Gleichzeitige Lösungsviskositätsmessungen in Phenol-Tetrachloräthan 1 : 1 (Gewichtsteile) bei 20°C ergaben unter Berücksichtigung des Methylester-Endgruppengehaltes als Viskositäts-Molekulargewichtsbeziehung der unfraktionierten Produkte \documentclass{article}\pagestyle{empty}\begin{document}$$\left[ {\rm \eta} \right] = 7.55 \cdot 10^{- 4} \cdot \bar {\rm M}_{n^{0,685} };\ 3000 \le \bar {\rm M}_n \le 30,000.$$\end{document}Fraktionierungen in dem System Phenol-Cyclohexan bei 70°C ergaben, daß die untersuchten Produkte eine Normalverteilung besaßen. Damit übereinstimmend wurden für Fraktionen bis zu 1,85 mal größere Molekulargewichte gefunden als für unfraktionierte Produkte gleicher Lösungsviskosität.Die Gleichgewichtskonstante der Polykondensation erwies sich als unabhängig vom Molekulargewicht (untersuchter Bereich 400 ≤ M̄n ≤ 3000).
    Additional Material: 5 Ill.
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  • 10
    Publication Date: 2023-04-26
    Description: Abstract
    Description: Organic matter (OM) is known to be an important reductant in sediment-hosted base metal deposits like the European Kupferschiefer. However, the precise nature of interactions between OM and hydrothermal fluids are still debated as well as how the interconnected reactions develop over geological timescales. This dataset provides for the first time bulk, compositional and stable isotope data of hydrocarbons, biomarkers and organonitrogen, -sulfur and-oxygen (NSO) compounds for the mineralized Kupferschiefer Spremberg-Graustein field in Eastern Germany based on samples from two drill cores. The study aims to help to better understand the role that organic matter plays during the mineralisation and formation of the sedimentary ore deposit within the Kupferschiefer with a focus on stable hydrogen isotope compositions and NSO compositional data to especially address the origin and to assess the oxidative nature of the brines that caused the mineralization in the Spremberg-Graustein field. The data publication includes bulk, compositional and stable isotope data on inorganic metals and organic matter. The data about metal contents were generated using ICP-MS while those on the organic matter were generated using Rock-Eval pyrolysis, a microscope, a Soxhlet apparatus, medium pressure liquid chromatography (MPLC), gas chromatography with flame ionization (GC-FID) and mass spectrometric detection (GC-MS), gas chromatography isotope ratio mass spectrometry (GC-IRMS) and ultrahigh resolution mass spectrometry (Fourier Transform ion cyclotron resonance mass spectrometry, FT-ICR-MS) with Electrospray ionization (ESI) and Atmospheric pressure photoionization (APPI). The full description of samples, methods and data is given in the following sections.
    Keywords: Kupferschiefer ; Permian ; Organic Matter ; NSO compounds ; hydrogen exchange ; metal porphyrins ; compound specific stable hydrogen isotopic composition ; FT-ICR-MS ; EARTH SCIENCE 〉 SOLID EARTH 〉 EARTH GASES/LIQUIDS 〉 PETROLEUM ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEOCHEMISTRY ; EARTH SCIENCE 〉 SOLID EARTH 〉 ROCKS/MINERALS/CRYSTALS 〉 METALS ; EARTH SCIENCE 〉 SOLID EARTH 〉 ROCKS/MINERALS/CRYSTALS 〉 SEDIMENTARY ROCKS
    Type: Dataset , Dataset
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