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1982 (1)
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1979 (1)
1Author    Arthur HollRequires cookie*
 Title    der grünen Huschspinne Micromata rosea (Sparassidae) Temperature-Dependent Colour Change in Larvae of the Green Spider Micromata rosea (Sparassidae)  
 Abstract    In the green coloured larvae of Micromata rosea but not in adults temperature raise above 29 °C causes immediate colour change: green to bluish-green. Colour change is reversible by temperature decline below 29 °C. Qualitative analysis of the yolk pigment reveals the same biliverdin conjugates (micromatabilin) as previously identified for adult spiders. The bluish-green colour (above 29 °C) re­ sults from an absorption band (675-680 nm, water phase, purified solution) modified to that of the green solution (below 29 °C). Presumably, the thermodependent, rever­ sible colour change is due to a special yolk protein bond to the micromatabilin chromophor. 
  Reference    Z. Naturforsch. 37c, 1040—1041 (1982); eingegangen am 25. März/30 Juni 1982 
  Published    1982 
  Keywords    Colour Change, Temperature, Spider, Micromatabilin 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-1040_n.pdf 
 Identifier    ZNC-1982-37c-1040_n 
 Volume    37 
2Author    Helga Sittertz-BhatkarRequires cookie*
 Title    Oral Cleansing in Spiders is Gland Mediated!  
 Abstract    Histochemical and micromorphological investigations of the gnathocoxal gland in spiders brought out its uniquely adaptive cleansing function. The prey particulates, caught in the oral mi­ crostructures, are bound with mucopolysaccharides or glyco-muco-proteins from the glandular se­ cretions in Araneus and Theridion species into a bolus, and are expelled following each food up­ take. 
  Reference    Z. Naturforsch. 35c, 669—673 (1980); received October 20 1979 
  Published    1980 
  Keywords    Oral Cleansing, Spiders, Gnathocoxal Gland, Histochemistry, Micromorphological Investigations 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0669.pdf 
 Identifier    ZNC-1980-35c-0669 
 Volume    35 
3Author    DavidS. WilliamsRequires cookie*
 Title    The Physiological Optics of a Nocturnal Semi-Aquatic Spider, Dolomedes aquaticus (Pisauridae)  
 Abstract    The optics of the posterior eyes of the amphibious spider, Dolomedes aquaticus, are described. The lenses have strongly-curved spherical front and rear surfaces, and therefore, a fairly high light capturing ability — they have F-numbers of 0.9 — yet, the large amount of spherical aberration predicted by their shape is mostly corrected. The receptive segments of the receptors are arranged in rows, each row separated by pigmented glial cells, but within a row, rhabdomeres from neigh­ bouring cells are contiguous so that coupling between cells from the same row seems a possible way of increasing absolute sensitivity for night vision. When the spider submerges, an air-layer is held over the comeal surfaces — as with a diver's face mask — so that light is focused on to the receptive layer of the retina under water as well as above. These features are considered as adaptations for the nocturnal and semi-aquatic habits of the spider. 
  Reference    Z. Naturforsch. 34c, 463 (1979); received February 12 1979 
  Published    1979 
  Keywords    Spider, Visual Optics, Single-Lens Eye, Night Vision, Under-Water Vision 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0463.pdf 
 Identifier    ZNC-1979-34c-0463 
 Volume    34