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  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Die Sehfelder der zentralen Ommatidien in den Appositionsaugen von Apis mellifica und Cataglyphis bicolor (Apidae, Formicidae; Hymenoptera) (1972)
    Springer
    Biological cybernetics 10 (1972), S. 168-179 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Experimental equipment has been developed to make possible continuous recordings of intensity distribution curves as a function of angle of incidence of light in single ommatidia of arthropod compound eyes. — As preliminary experiment, the visual fields of ommatidia in Limulus, Apis and Cataglyphis have been ascertained without a light measuring instrument. A point source was moved through the visual field and the angular position of the light source on both sides of the visual field at which the rhabdome in the cut-off eye viewed from proximal turned dark was determined. In the dorsal part of the Limulus eye, the cranio-caudal width of the visual field is 42.6±0.3°. The width of the visual field of central ommatidia in Apis is 6.68±0.14° in the dorsoventral plane and 7.42±0.24° in the cranio-caudal direction, in Cataglyphis 15.5±0.5° and 12.5±0.4° respectively.— Similar Gaussian curves for light and dark adapted ommatidia resulted from the continuous recordings of intensity distribution curves in Apis. The rotatory symmetric curve of the worker bee has a half-width of Δρ=2.57°. The standardized curve of amplitude one may be approximated by the function y=exp (-0.41 [degree−2]ϕ 2). In Cataglyphis, the half-width of the intensity distribution curve is Δρ=8.8° in the dorso-ventral plane and Δρ=6.8° in the cranio-caudal plane. Near the axis, the functions y=exp(-0.04 [degree−2]ϕ2) and y=exp(-0.06 [degree−2]ϕ 2) approximate the standardized curves. — Knowledge of intensity distributions in connection with interommatidial angles Δρ allows estimation of contrast transfer and resolving power of the array of the dioptric systems. Correlations with behavioural findings are attempted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290516
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Accuracy in film-scanner intensity measurements (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 489-491 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The accuracy in X-ray diffraction intensities obtained by the use of an automatic IBM 1800-controlled SAAB film scanner is discussed. The random errors have been found to be around 4% of the intensities for most reflexions. By comparison with data obtained from a Joyce–Loebl microdensitometer it has been found that there are no serious systematic errors in the film-scanner data. Measurements from Weissenberg and precession films are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739470001286
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Prediction of partially recorded reflexions on screenless precession photographs (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 462-463 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Three-dimensionally valid equations for the prediction of partially recorded reflexions on screenless precession photographs are proposed. The equations are based on a discussion of the mosaic spread of the crystal. Applications to the collection of 5 Å resolution data from hexon, a surface protein in the shell of adenovirus [Franklin, R. M., Harrison, S. C., Pettersson, U., Philipson, L., Brändén, C. J. & Werner, P.-E. (1971). Cold Spring Harbor Symposia on Quantitative Biology. Vol. XXXVI, pp. 503-510] are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473001117
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    Paper (German National Licenses)
    Fulltext
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