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  • 1980-1984  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Afocal apposition optics in butterfly eyes (1984)
    [s.l.] : Nature Publishing Group
    Nature 312 (1984), S. 561-563 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The apposition eye consists of optically isolated units (ommatidia) each having a lens forming an inverted image (see Fig. 1 of rf. 7). In superposition eyes, the lens systems of many ommatidia cooperate to form a superimposed erect image. Here we measured the optical properties of the ommatidia ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/312561a0
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  • 2
    Digitale Medien
    Digitale Medien
    Evolutionary links between apposition and superposition optics in crustacean eyes (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 818-821 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The two basic types of arthropod compound eye, apposition and superposition, use widely different optical principles1*5. The apposition eye consists of optically isolated units (ommatidia), each having a lens forming an inverted image (Fig. la). In superposition eyes, the lens systems of many ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/302818a0
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  • 3
    Digitale Medien
    Digitale Medien
    The euphausiid compound eye — a morphological re-investigation (Crustacea: Euphausiacea) (1983)
    Springer
    Zoomorphology 103 (1983), S. 59-66 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The ommatidia of the compund eye of the krill, Meganyctiphanes norvegica, are composed of the following cell types: corneagenous cells, main cone cells, accessory cone cells, distal pigment cells, and retinula cells. The corneagenous cells secrete the cuticular lenses, below which the crystalline cones are present. The bipartite crystalline cone is formed within the main cone cells, whereas the accessory cone cells invest the distal part of the cone and proceed proximally in the retina to the basement membrane. Six distal pigment cells are arranged around each ommatidium, though shared by adjacent ommatidia. The seven retinula cells form the rhabdom, and penetrate the basement membrane as axons. The basement membrane is formed by the conjoined extended prolongations from the accessory cone cells and sheets from the basal pigment cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312058
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  • 4
    Digitale Medien
    Digitale Medien
    Fine structure and optical properties of an ostracode (Crustacea) nauplius eye (1981)
    Springer
    Protoplasma 107 (1981), S. 361-374 
    Details
    ISSN: 1615-6102
    Schlagwort(e): Nauplius eye ; Optics ; Ostracoda
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary InNotodromas monachus, the three cups of the nauplius eye are formed by four pigment cells. The insides of the cups are lined with tapetal cells, which produce several layers of reflecting crystals. The reflecting crystals form a concave mirror in each cup upon which the retinular cells rest. The two-celled rhabdoms are few and perpendicular to the tapetal layer. The axons from the tripartite eye leave the retinular cells distally in three separate groups. The eye is thus of the inverse type. Large lens cells, with a low refractive index, are present in the open part of each cup. Distal to the lens cells, highly refractive lenses are formed in the cuticle. These lenses serve to decrease the effective curvature of the mirrors, thus enabling the reflectors to produce a focused image on the retina. The ventral cup differs by the lack of a cuticular lens and has degenerated-appearing cellular elements. The investigated nauplius eye is the only one known with both a mirror and a highly refractive lens in the dioptric apparatus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01276836
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