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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Planta 79 (1968), S. 113-121 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. 28 marine Algen aus den Klassen der Chlorophyceen (5 Arten), Phaeophyceen (11) und Rhodophyceen (12) wurden auf das Vorkommen flüchtiger Amine untersucht. 2. Mit Hilfe papierchromatographischer und mikrokristallographischer Methoden konnten insgesamt 9 flüchtige Amine in Algen nachgewiesen werden: Methylamin (MA), Dimethylamin (DMA), Trimethylamin (TMA), Äthylamin (ÄA), Propylamin (PA), Isobutylamin (iBA), Isoamylamin (iAA), 2-Phenyläthylamin (PÄA) und das bisher aus der Natur nicht bekannte 2-Methylmercaptopropylamin (MMPA). 3. Weitverbreitet findet sich bei Algen Trimethylamin (in 23 von 28 untersuchten Arten), während Dimethylamin nur in 2 Arten sicher nachgewiesen werden konnte. Das natürliche Vorkommen von Methylamin ist nicht gesichert, da dieses Amin möglicherweise erst bei der Aufarbeitung aus instabilen Methylaminoverbindungen entsteht. 4. Primäre Amine kommen in Vertretern aller 3 Algenklassen vor, besonders verbreitet jedoch bei Rhodophyceen (7 von 12 Arten). Biogenetisch werden zumindest die primären Amine der Rhodophyceen, mit Ausnahme von Methylamin, durch enzymatische Decarboxylierung aus entsprechenden Aminosäuren gebildet.
    Notes: Summary Twenty-eight species of marine Chlorophyceae (5), Phaeophyceae (11), and Rhodophyceae (12) were examined for the occurence of simple volatile amines. The volatile alkaline constituents of the algal samples were extrated by alkaline steam destillation and separated and identified by paper chromatography and microcristallography. A total of 9 volatile amines were found to occur in the species so far examined: methylamine (MA), dimethylamine (DMA), trimethylamine (TMA), ethylamine (ÄA), propylamine (PA), isobutylamine (iBA), isoamylamine (iAA), 2-phenylethylamine (PÄA), and 2-methylmercaptopropylamine (MMPA). MMPA has not previously been reported to occur in any other plant. The occurence of TMA is widespread in marine algae (23 of 28 sp.) whereas an occurrence of DMA could be demonstrated only in two species. MA, which was found in all algal samples, might be formed from labile methylamino-compounds in the course of preparation. Its coccurrence as a natural constituent of algae remains doubtful. Primary amines could be identified in species of each of the three classes of algae, but an especially widespread occurrence was found in Rhodophyceae. With the exception of MA the primary volatile amines, at least those of Rhodophyceae, arise biosynthetically from the corresponding amino acids by enzymatic decarboxylation.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 77 (1928), S. 68-76 
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 155 (1987), S. 133-141 
    ISSN: 1615-6110
    Keywords: Lichens ; Caloplaca polycarpoides ; Lecania triseptata ; L. diplococca ; Rinodina afghanica ; New taxa of parasitical lichens ; morphology ; Flora of Afghanistan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract No less than 3 different parasitical lichens were found on the corticolous lichenCaloplaca polycarpoides in Afghanistan. Partly, they also grow on closely allied species of the sect.Xanthoriella. Lecania triseptata begins and ends as a typical parasite, and does not form a thallus outside of its host.L. diplococca andRinodina afghanica, both described as new species, have a similar appearance; they are parasitic in the beginning, but form their own thalli outside the host later on. The 3 species are members of the small group of parasitical lichens growing on corticolous hosts. Possibly, the slow degeneration of cortices under the arid climatical conditions, has allowed the evolution of parasitic lichens of this rare type in Central Asia.
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 78 (1929), S. 347-357 
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 77 (1928), S. 147-157 
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 77 (1928), S. 227-238 
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Plant systematics and evolution 78 (1929), S. 284-288 
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 18
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the magnetic excitations in CsFeBr3 along the chain direction (z-axis) and perpendicular to it by inelastic neutron scattering. The measured dispersion curves can be reproduced by the formula $$\omega ^2 (q) = A^2 - 8A[J\cos (\pi q_c ) + J'\gamma (2\pi q_ \bot )]R(T)$$ which is very different from dispersion relations for usual 1 D antiferromagnets, because of the singlet groundstate of this system. The large value of the anisotropy energyA/k=29.8±0.5 K, which is independent of temperature, causes the singlet groundstate. The intra-and inter-chain exchange parameters areJ/k=−3.2±0.15K andJ'/k=−0.32±0.02 K determined atT=1.4 K. At 1.4 K the renormalisation factor is taken to beR(T)=1. AtT=30 K the value forR(T) was found to be 0.5±0.1 keepingJ andJ' unchanged. The excitations at (1/3 1/31) show soft mode behaviour but no phase transition. The observed intensities are interpreted by a heuristic model for the eigenvectors in the excited state including antiferro-as well as ferromagnetic configurations of the fluctuations.
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  • 19
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have utilized the polarized neutron scattering technique for the determination of the nuclear temperature in copper from 20 mK down to 100 μK. Using a cooling facility where two adiabatic demagnetization stages work in series we have calibrated the flipping ratio of neutrons scattered from the (200) Bragg-peak against the nuclear polarization over the whole polarization range. The observed calibration curve deviates considerably from the curve expected for an extinction-free sample. The polarized neutron thermometer is discussed and applied in measurements of the spin-lattice relaxation in copper.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 42 (1909), S. 3674-3683 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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