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  • Chemistry  (129)
  • Afrothismia foertheriana
  • Magnetism
  • taxonomy
  • 2000-2004  (5)
  • 1975-1979  (45)
  • 1970-1974  (82)
  • 1
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    A new species of Afrothismia (Burmanniaceae; tribe: Thismieae) from the western foothills of Mount Cameroon (2004)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.49 (2004) nr.2/3 p.451
    Details
    Publication Date: 2015-03-06
    Description: Afrothismia foertheriana, a new species of Burmanniaceae (tribe: Thismieae) from the peripheral zone of the Onge Forest Reserve in Cameroon’s Southwest Province is described and illustrated. The papillose, multicellular floral trichomes, the tepal’s erose margins, the small, zygomorphic perianth mouth and the dull purplish brown coloration give A. foertheriana a distinctive appearance within the genus. The species is here assessed as being critically endangered.
    Keywords: Burmanniaceae ; Thismieae ; Afrothismia foertheriana ; Cameroon ; conservation ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
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  • 2
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    A new species of Afrothismia (Burmanniaceae; tribe: Thismieae) from the western foothills of Mount Cameroon (2004)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 49 no. 2/3, pp. 451-456
    Details
    Publication Date: 2024-01-12
    Description: Afrothismia foertheriana, a new species of Burmanniaceae (tribe: Thismieae) from the peripheral zone of the Onge Forest Reserve in Cameroon\xe2\x80\x99s Southwest Province is described and illustrated. The papillose, multicellular floral trichomes, the tepal\xe2\x80\x99s erose margins, the small, zygomorphic perianth mouth and the dull purplish brown coloration give A. foertheriana a distinctive appearance within the genus. The species is here assessed as being critically endangered.
    Keywords: Burmanniaceae ; Thismieae ; Afrothismia foertheriana ; Cameroon ; conservation ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 3
    Electronic Resource
    Electronic Resource
    Re-examination of some species of the genus Geotrichum Link: Fr (2000)
    Springer
    Antonie van Leeuwenhoek 77 (2000), S. 71-81 
    Details
    ISSN: 1572-9699
    Keywords: DNA heterogeneity ; genome comparison ; Geotrichum ; taxonomy ; yeast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The nutritional physiology and the growth rate of thirty-four strains representing species of Geotrichum without known teleomorph states were examined. From twenty-seven strains the mol% G+C were calculated from the DNA melting curves. The first derivatives of the melting curves of seven strains, including the type strain of Geotrichum clavatum, demonstrated the presence of two peaks, 12% away from each other; the remaining strains showed only a single broad peak. DNA homology values among strains of the former group were high, indicating their conspecificity. The strains of the latter group could be subdivided into six DNA homology groups, four of which could be identified with recognized species and two may represent novel taxa. A combined key of Geotrichum and its teleomorph states Galactomyces and Dipodascus is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002030518989
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of the base-pairing content of four specific tRNAs by infrared spectroscopy (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 1735-1745 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Infrared spectroscopy was used for the determination of the base-pairing content of four specific tRNAs in deuterium oxide solution. Infrared spectra were obtained in the 1750-1550 cm-1 region at various temperatures ranging from about 15 to 90°C. Melting curves were constructed by plotting the molar extinction coefficient at ν = 1657 cm-1 versus temperature. These transition curves enabled us to determine the ranges of temperature which correspond to the ordered (partially double-stranded) or randomly coiled structure of the tRNA. For a set of wavenumbers the extinction coefficients at these temperatures were used for the calculation of the base-pairing content. The procedure employed here is based on a method described earlier by Thomas [(1969) Biopolymers 7, 325-334]. For the conditions selected for this investigation (Mg2+-free D2O-buffer; 0.01M tris-DCl, 0.015M NaCl, pD 7.5) the results of this determination agree within the limits of errors with the number of base pairs predicted by the cloverleaf model.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160810
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  • 5
    Electronic Resource
    Electronic Resource
    An electron microscopic method for studying nucleic acid-protein complexes. Visualization of RNA polymerase bound to the DNA of bacteriophages T7 and T3Dedicated to the memory of Dr. Jean-Pierre Tranzer. (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 995-1009 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Double-stranded DNA can be readily adsorbed on mica or directly on carbon coated grids from the surface of solutions containing ethidium bromide, actinomine, or propidium diiodide. The DNA molecules are unfolded, well separated, and show a length distribution similar to molecules prepared by protein monolayer techniques.Since the intercalating dyes tested do not lead to an increased apparent diameter of the nucleic acid the method is useful for the study of nucleic acid-protein complexes. As a model, the binding of E. coli RNA polymerase to phage T7 and T3 DNA was examined under different conditions. The enzyme can easily be identified and its position along the DNA molecule can be mapped.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130514
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  • 6
    Electronic Resource
    Electronic Resource
    Zellphysiologie des Stoffwechsels. Von D. Pette. Bd. 13 der Konstanzer Universitätsreden. Herausgeg. von G. Hess. Konstanzer Universitätsverlag 1970. 50 S., brosch. DM 4,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 196-196 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040613
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  • 7
    Electronic Resource
    Electronic Resource
    Physikalische Methoden in der Chemie: UV-Photoelektronenspektroskopie (1971)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 5 (1971), S. 65-77 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19710050302
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  • 8
    Electronic Resource
    Electronic Resource
    Notiz über ein einfaches Verfahren zur Darstellung von 3,4-Bismethylencyclobuten (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3461-3462 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061031
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  • 9
    Electronic Resource
    Electronic Resource
    [2.2]Paracyclophane durch Addition von Acetylenderivaten an 1,2,4,5-Hexatetraen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1891-1902 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of [2.2]Paracyclophanes by Addition of Acetylene Derivatives to 1,2,4,5-HexatetraeneThe tetrasubstituted [2.2]paracyclophanes 4a - e are formed by cycloaddition of the symmetrical acetylene derivatives 2a - e to 1,2,4,5-hexatetraene (1), and their constitution and configuration is established by spectroscopic methods, degradation and pyrolysis experiments. The tetramethyl ester 4a is reduced to the tetraalcohol 4g, and the tetracarboxylic acid 4c is converted to the bisanhydride 4f and [2.2] paracyclophanes (4h), respectively. All possible disubstituted [2.2] paracyclophanes 6 are obtained when methyl propiolate (5a) is added to. 1, whereas further symmetrical and unsymmetrical acetylene derivatives do not react with 1.
    Notes: Die tetrasubstituierten [2.2]Paracyclophane 4a - e werden durch Cycloaddition der symmetrischen Acetylenderivate 2a - e an 1,2,4,5-Hexatetraen (1) dargestellt und ihre Konstitution und Konfiguration durch spektroskopische Methoden. Abbau- und Pyrolyseversuche bewiesen. Der Tetramethylester 4a wird zum Tetraalkohol 4g reduziert und die Tetracarbonsäure 4c in das Bisanhydrid 4f bzw. [2.2] Paracyclophan (4h) übergeführt. Bei der Anlagerung von Propiolsäure-methylester (5a) an 1 werden alle isomeren disubstituierten [2.2]paracyclophanes 6 erhalten. Weitere symmetrische und unsymmetrische Acetylenderivate reagieren nicht mit 1.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070613
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  • 10
    Electronic Resource
    Electronic Resource
    Free radicals in colloidal systems: Formation and decay of radicals in the tensides α-hexadecyl-ω-hydroxypoly(oxyethylene) and α-tetradecyl-ω-(sodium sulfonato)tri(oxyethylene) (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2279-2295 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Organic radicals were produced in the tensides C16H33(OCH2CH2)21OH and C14H29(OCH2CH2)3-SO3Na in aqueous solutions using a short pulse of high energy electrons. The radicals were formed by OH attack on the (OCH2CH2)x-parts of the tensides. The decay of the 250nm absorption of the radicals was recorded at different initial radical concentrations and tenside concentrations. Several radicals could be produced in one micelle. Radicals formed in the same micelle decay within microseconds or faster. The half life time τ1 in a micelle carrying two radicals is 2,0·10-6 s for C16H33(OCH2CH2)21 OH and less than 6·10-7 s for C14H29(OCH2CH2)3SO3Na. A model for intramicellar radical-radical reactions is proposed according to which the rate is faster in tensides of high critical micelle concentration. Single radicals in micelles of C16H33(OCH2CH2)21OH can deactivate each other without leaving the micelles. This intermicellar reaction is discussed in terms of the rate of diffusion-controlled micelle-micelle encounters, an encounter time of 7·10-8s, and the above time τ1 for intramicellar reaction. The observed rate constant 2k of intermicellar reaction is 3,5·106 mol-1·l·s-1. At low tenside concentrations, the bimolecular rate constant increases since more single tenside radicals are present in solution. They react rapidly (ca. 108 mol-1·l·s-1) with radicals in micelles. Single radicals in C14H33(OCH2CH2)3-SO3Na micelles cannot directly react with each other because of the Coulombic repulsion between two anionic micelles. Reaction occurs after the exit of a tenside radical from its micelle, the rate of which depends on the micellar equilibrium Mn⇄Mn-1+M (M: tenside molecule; n: agglomeration number of micelle). A single radical in solution reacts with a single radical in a micelle with 2k = 1,0·108 mol-1·l·s-1 and with another single radical in solution with 4,0·107 mol-1·l·s-1.γ-Irradiation of both tensides in aqueous solution leads to slight increases in viscosity, followed by turbidity beyond the “gel dose” and phase separation. These effects are explained in terms of crosslinking of tenside molecules. Formation of a large network requires bridges between all participating tenside molecules (not only bridges between micelles).
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790915
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