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  • Chemistry  (2)
  • Direction-selective neurons  (1)
  • Key words Bacterial polysaccharide  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A system of insect neurons sensitive to horizontal and vertical image motion connects the medulla and midbrain (1991)
    Springer
    Journal of comparative physiology 169 (1991), S. 355-367 
    Details
    ISSN: 1432-1351
    Keywords: Motion-sensitive neurons ; Direction-selective neurons ; Insect medulla ; Contrast frequency ; Motion detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The response properties and gross morphologies of neurons that connect the medulla and midbrain in the butterfly Papilio aegeus are described. The neurons presented give direction-selective responses, i.e. they are excited by motion in the preferred direction and the background activity of the cells is inhibited by motion in the opposite, null, direction. The neurons are either maximally sensitive to horizontal motion or to slightly off-axis vertical upward or vertical downward motion, when tested in the frontal visual field. The responses of the cells are dependent on the contrast frequency of the stimulus with peak values at 5–10 Hz. The receptive fields of the medulla neurons are large and are most sensitive in the frontal visual field. Examination of the local and global properties of the receptive fields of the medulla neurons indicates that (1) they are fed by local elementary motion-detectors consistent with the correlation model and (2) there is a non-linear spatial integration mechanism in operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207000
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Expression and biochemical characterisation of recombinant AceA, a bacterial α-mannosyltransferase (1999)
    Springer
    Molecular genetics and genomics 261 (1999), S. 933-940 
    Details
    ISSN: 1617-4623
    Keywords: Key words Bacterial polysaccharide ; Glycosyltransferase ; Acetan ; Acetobacter xylinum ; Biosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Biosynthesis of repeat-unit polysaccharides and N-linked glycans proceeds by sequential transfer of sugars from the appropriate sugar donor to an activated lipid carrier. The transfer of each sugar is catalysed by a specific glycosyltransferase. The molecular basis of the specificity of sugar addition is not yet well understood, mainly because of the difficulty of isolating these proteins. In this study, the aceA gene product expressed by Acetobacter xylinum, which is involved in the biosynthesis of the exopolysaccharide acetan, was overproduced in Escherichia coli and its function was characterised. The aceA ORF was subcloned into the expression vector pET29 in frame with the S·tag epitope. The recombinant protein was identified, and culture conditions were optimised for production of the soluble protein. The results of test reactions showed that AceA is able to transfer one α-mannose residue from GDP-mannose to cellobiose-P-P-lipid to produce α-mannose-cellobiose-P-P-lipid. AceA was not able to use free cellobiose as a substrate, indicating that the pyrophosphate-lipid moiety is needed for enzymatic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380051040
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Physical modelling fire performance of wall-covering materials (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 17 (1993), S. 293-303 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A small-scale enclosure was constructed for characterizing the contribution of interior finish wall-lining materials to fire growth in compartments. The enclosure was based upon refinements to a design devised by scientists at the National Institute for Standards and Technology for quarter-scale modelling of room fire tests on interior-finish materials. A large volume of evidence is presented demonstrating how this small-scale enclosure could provide the information about surface flammability, heat release, smoke generation and contribution to fire growth that is required for a reasonable assessment of the fire performance of interior wall-finish materials.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810170606
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Mass spectrometry of the 11H-dibenzo[c,f][1,2]-diazepine systemPartial support of this work by US Public Health Service Grant CA 08495, National Cancer Institute is gratefully acknowledged.See Ref. 1. (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1169-1174 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of 3,8-dichloro-11H-dibenzo[c,f] [1,2]diazepine, the corresponding diazepin-11-01 and diazepin-11-one and their dihydro and N-oxide derivatives have been recorded. The most important fragmentation of the molecular ions of all diazepines studied was an initial loss of m/e 28, with further fragmentation depending on the 11-substituent. No general pathway was observed for the corresponding N-oxides and dihydro compounds.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030905
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    Paper (German National Licenses)
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