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  • Chemistry  (5)
  • Graph theory  (2)
  • Algorithm  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Detection of rotational and involutional symmetries and congruity of polyhedra (1996)
    Springer
    The visual computer 12 (1996), S. 193-201 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Symmetry detection ; Congruity problem ; Algorithm design ; Graph theory ; Computational geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: O (m 2) time and uses O(m) space, where m is the number of edges of the polyhedron. As this is the lower bound of the symmetry detection problem for the considered output form, our algorithm is optimal. We show that a slight modification of our symmetry detection algorithm can be used to solve the related conguity problem of polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01782322
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  • 2
    Electronic Resource
    Electronic Resource
    Fast segmentation of range images into planar regions by scan line grouping (1994)
    Springer
    Machine vision and applications 7 (1994), S. 115-122 
    Details
    ISSN: 1432-1769
    Keywords: Algorithm ; Range data ; Segmentation ; Region growing ; Planar surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A novel technique is presented for rapid partitioning of surfaces in range images into planar patches. The method extends and improves Pavlidis' algorithm (1976), proposed for segmenting images from electron microscopes. The new method is based on region growing where the segmentation primitives are scan line grouping features instead of individual pixels. We use a noise variance estimation to automatically set thresholds so that the algorithm can adapt to the noise conditions of different range images. The proposed algorithm has been tested on real range images acquired by two different range sensors. Experimental results show that the proposed algorithm is fast and robust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01215806
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  • 3
    Electronic Resource
    Electronic Resource
    Detection of rotational and involutional symmetries and congruity of polyhedra (1996)
    Springer
    The visual computer 12 (1996), S. 193-201 
    Details
    ISSN: 1432-2315
    Keywords: Symmetry detection ; Congruity problem ; Algorithm design ; Graph theory ; Computational geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We propose a simple and efficient general algorithm for determining both rotational and involutional symmetries of polyhedra. It requiresO(m 2) time and usesO(m) space, wherem is the number of edges of the polyhedron. As this is the lower bound of the symmetry detection problem for the considered output form, our algorithm is optimal. We show that a slight modification of our symmetry detection algorithm can be used to solve the related conguity problem of polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01782322
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Literaturkarussell. Umwelt (1998)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 32 (1998), S. XV 
    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.19980320519
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  • 5
    Electronic Resource
    Electronic Resource
    Capillary electrophoretic chiral resolution of vicinal diols by complexation with borate and cyclodextrin: Comparative studies on different cyclodextrin derivatives (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 153-156 
    Details
    ISSN: 0899-0042
    Keywords: chiral separation ; β-cyclodextrin derivatives ; capillary electrophoresis ; vicinal diols ; borate complexation ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Capillary electrophoretic enantioseparation of compounds containing vicinal diol groups have been investigated using different β-cyclodextrin (CD) derivatives and borate as a background electrolyte. Both native β-CD and several β-CD derivatives are examined. Chiral recognition is attributed to both enantioselective inclusion of the analyte into the chiral cavity of the CD and complexation with borate. The influence of concentration of the chiral selector, pH, and organic modifiers on the resolution was studied. Four diols were baseline separated. Chirality 9:153-156, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Pyrrolinone, IV Pyrrolin-2-one mit β-ständigen elektronenziehenden Substituenten (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 410-424 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pyrrolinones, IV Pyrrolin-2-ones with Electron Attracting Substituents in the β-PositionsThe pyrrolinones 3-7, synthesized from maleic acid derivatives and enamines and also their reaction products 8-24 are described. By comparison with the classic-type dipyrromethenes 26, 30, and 31 the dipyrromethenes 27 as well as 25, 28, and 29 are shown to exist as lactams (neo-type dipyrromethenes). In basic solution 27 exhibits a deep blue color which is unusual for dipyrromethenes.
    Notes: Die aus Maleinsäure-Derivaten und Enaminen gewonnenen Pyrrolinone 3-7 und ihre Umsetzungsprodukte 8-24 werden beschrieben. Durch vergleichende Untersuchungen mit den klassischen Dipyrromethenen 26, 30 und 31 wird nachgewiesen, daß 27 ebenso wie 25, 28 und 29 Lactamstrukturen aufweisen, also als Neo-dipyrromethene vorliegen. 27 zeigt in basischen Lösungen eine für Dipyrromethene ungewöhnliche tiefblaue Farbe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810309
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  • 7
    Electronic Resource
    Electronic Resource
    Darstellung und Reaktionen von methylenverbrückten Phosphor(III)-Phosphor(V)-Verbindungen (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 90-102 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Reactions of Methylene-bridged Phosphorus(III)-Phosphorus(V) CompoundsThe synthesis of methylene-bridged diphosphorus compounds of the type Y2PCH2P(S)X2 (with Y = F, Cl, OPri, NMe2, Ph) is reported. Reactions of these compounds with bicycloheptadiene-metaltetracarbonyls to form complexes of the type (L—L′)M(CO)4 and (L—L′)2M(CO)4, respectively, as well as some oxidation reactions and the conversion of the phosphine F2PCH2P(S)F2 to the cyclotetraphosphine [PCH2P(S)F2]4 are described.
    Notes: Über die Darstellung von methylenverbrückten Diphosphorverbindungen der Zusammensetzung Y2PCH2P(S)X2 (mit Y = F, Cl, OPri, NMe2, Ph; X = F, OPri, NMe2, Ph) wird berichtet. Umsetzungen der erhaltenen Verbindungen mit Bicycloheptadien-Metalltetracarbonylen zu Komplexen des Typs (L—L′)M(CO)4 bzw. (L—L′)2M(CO)4 (mit M = Cr, Mo, W), einige Oxidationsreaktionen und die Umwandlung des Phosphans F2PCH2P(S)F2 zum Cyclotetraphosphan [PCH2P(S)F2]4 werden beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885660113
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  • 8
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    Unknown
    Anwendung von Fischzellkulturen in der Meeresforschung (2021)
    In:  ulrike.kammann@vti.bund.de | http://aquaticcommons.org/id/eprint/3245 | 1240 | 2012-11-10 14:39:40 | 3245 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-06-26
    Description: A large number of chemical pollutants can be foundin the marine environment. So it is necessary to obtaininformations about the toxic effects of this contaminantmixtures in general and especially on singlecell level. We used an organic extract of a marine sedimentfrom the North Sea to investigate its cyto- andgenotoxicity with an in vitro system, the comet assayor single cell gel electrophoresis (SCGE). The cometassay can be applied for estimating genotoxic effectsof chemicals on single cell level. First results confirmthe sensitivity of this assay and its applicability in assessing genotoxic load in environmental samples. Apermant cell line, the EPC (Ephithelioma papulosumcyprini) was used for the experiments. It was possibleto demonstrate the suitability of this in vitro test systemfor assessing genotoxic and cytotoxic effects ofmarine sediment extracts on EPC cells.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung = Information on Fishery research in 2010.
    Keywords: Ecology ; Environment ; Chemistry ; toxicity ; marine fish cells ; gentoxicity
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 48-51
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