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  • 1
    Electronic Resource
    Electronic Resource
    The zinc-sulfur bonds of aspartate transcarbamylase studied by x-ray absorption spectroscopy (1982)
    s.l. : American Chemical Society
    Biochemistry 21 (1982), S. 830-834 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00534a003
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diffraction by dispersion of spherical membrane vesicles. I. The basic equations (1975)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 31 (1975), S. 8-15 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Equations are obtained for the coherent diffraction by a dispersion of spherical vesicles of different radii, where each vesicle is bounded by an identical membrane having negligible tangential structure. The diffraction pattern is compared with that given by an assemblage of flat sheets of the same membrane, and the two patterns are shown to differ significantly. The effects of membrane curvature thereby interfere with the determination of the membrane's structure; but, when correctly used, they might assist that determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739475000022
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Visual System of Octopus : (2) Discrimination of Polarized Light by Octopus (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 839-840 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MANY animals, when illuminated by plane polarized light, orient their movements with respect to the plane of polarization. In a recent review Kalmus1 has discussed the fact that this orientation is not necessarily dependent upon the ability of the animal's eye to analyse polarized light; in many ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186839a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Eliminating Spherical Aberration and preserving Phase Contrast Information in Electron Microscopy (1968)
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 263-265 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because the spherical aberration phase is proportional to the fourth power of the scattering angle, spherical aberration is very small for waves scattered through less than a certain minimum angle. Consequently, the central part of the diffraction pattern formed at the back focal plane of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/218263a0
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  • 5
    Electronic Resource
    Electronic Resource
    The discrimination of polarized light by Octopus: a behavioural and morphological study (1961)
    Springer
    Journal of comparative physiology 44 (1961), S. 268-291 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Groups of octopuses were trained to discriminate between different directions of the electric vector of plane polarized light coming from a small underwater torch. 2. Clear discrimination was shown between vertical and horizontal, and between 45° and 135° oblique directions of the electric vector. 3. The possible ways in which the animal might base its discrimination on the perception of scattering or reflection patterns in its environment are examined, and it is concluded that they do not provide a satisfactory explanation. 4. The discriminations probably involve specialised retinal photoreceptors, so some electron microscopical findings are presented concerning the structure of the receptor layer of the retina. The tubules of the two rhabdomeres on opposite sides of any one retinula cell are often approximately parallel, but those attached to different retinula cells can have quite different directions. 5. Theoretical reasons are given for supposing that the rhabdomere tubules show dichroism (though this might be difficult to observe); polarized light should be absorbed preferentially when its electric vector lies parallel to the long axis of a tubule. If the rhabdomeres do indeed show this dichroism, most of the receptor units of the octopus retina should give different responses for different directions of the electric vector of polarized light. 6. This hypothesis is shown to be consistent with both the observed discriminations and the fine structure of the receptor layer of the retina. 7. The connection between these results and the square “grid” organisation of the receptor layer of the retina is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298356
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  • 6
    Electronic Resource
    Electronic Resource
    Geodesic surfactant structures (1995)
    [s.l.] : Nature Publishing Group
    Nature 378 (1995), S. 21-21 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Structures formed by the self-association of amphiphiles (liquid crystals, vesicles and micelles) excite interest because of their potential uses as vectors for drug and gene delivery (see, for exam-ple, ref. 1), and as matrices from which new structured materials can be made (for example, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/378021a0
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    Paper (German National Licenses)
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