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'Crayfish' in keywords
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1992 (2)
1978 (1)
1975 (1)
1Author    Alf HamannRequires cookie*
 Title    Stress-Induced Changes in Cell Titer of Crayfish Hemolymph  
 Abstract    Cell titer in peripheral hemolymph of crayfishes rises in less than one hour after administration of stress. The stress may be wounding or handling of the animals. 
  Reference    (Z. Naturforsch. 30c, 850 [1975]; received August 11 1975) 
  Published    1975 
  Keywords    Crayfish, Hemolymph Coagulation, Hemocytes, Stress, Hormonal Regulation 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0850_n.pdf 
 Identifier    ZNC-1975-30c-0850_n 
 Volume    30 
2Author    Ulrich SchraermeyerRequires cookie*
 Title    Effects of Chloroquine on the Photosensory Membrane Turnover and the Ultrastructure of Lysosome-Related Bodies of the Crayfish Photoreceptor  
 Abstract    The effect o f chloroquine in combination with bright light on the ultrastructure o f crayfish (Orconectes limosus R.) photoreceptors was investigated in vivo. Chloroquine had several ef­ fects upon the crayfish retina. Multivesicular bodies (M VB) that are involved in lysosom al degradation o f photosensory membrane were altered in ultrastructure. M VB frequently con­ tained smaller M VB in a state o f more advanced membrane degradation. A dditionally screen­ ing pigment-like granules appeared in MVB. MVB accumulated in and filled the retinular cell cytoplasm just proximal or distal to the basement membrane which indicated inhibition o f photosensory membrane degradation. Under chloroquine treatment rhabdom degradation appeared to be inhibited, as rhabdom diameter was less reduced under these conditions. A lso chloroquine caused accumulation o f screening pigment granules in glial cells within the lamina ganglionaris. 
  Reference    Z. Naturforsch. 47c, 420 (1992); received January 17 1992 
  Published    1992 
  Keywords    Electron M icroscopy, Chloroquine, Crayfish, Photoreceptor, Screening Pigment Granules 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0420.pdf 
 Identifier    ZNC-1992-47c-0420 
 Volume    47 
3Author    Paul Kuppert, M. Argit Büchler, Klaus-Dieter SpindlerRequires cookie*
 Title    Distribution and Transport of Molting Hormones in the Crayfish, Orconectes limosus  
 Abstract    W hen [ aH ]ecdysone is injected in intermolt crayfishes, about 60 — 70% of the total radioactivity are excreted within one hour as the unchanged hormone, but nearly no [ 3H]ecdysterone is ex­ creted. The remaining [ 3H]ecdysone in the body is effectively converted to [ 3H ] ecdysterone. In addition polar and apolar metabolites of both m olting hormones can be extracted in an organ specific pattern. On the basis of radioactivity per g fresh weight hypodermis and male gonads and to a lesser extent hindgut and midgut gland contain most of the injected radioactivity. It can be demonstrated from in vitro experiments using the charcoal adsorption test and equilibrium dialysis that the cytosol of target tissues is able to bind both hormones with the highest capacity for hypo­ dermis and male gonads. Both molting hormones do not appear to be bound to carrier proteins in the hemolymph. 
  Reference    Z. Naturforsch. 33c, 437 (1978); received A p ril 24 1978 
  Published    1978 
  Keywords    M olting Hormones, Crayfish, Ecdysteroid Tissue Distribution, Ecdysteroid Hemolymph Transport 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0437.pdf 
 Identifier    ZNC-1978-33c-0437 
 Volume    33 
4Author    Ulrich SchraermeyerRequires cookie*
 Title    Evidence for a Pathway of Distal Screening Pigment Granules across the Basement Membrane of the Crayfish Photoreceptor  
 Abstract    The distal pigment cells o f Orconectes limosus contain two layers o f large electron lucent vacuoles that are separated by layers o f small right-angled platelets adjacent to the crystalline cones. The crystalline cones o f the dioptric apparatus o f this species have evaginations into the distal pigment cell cytoplasm. In photoreceptors o f Orconectes limosus and Procambarus clar-kii a dark pigment accumulation site was detected just distal to the basement membrane at the edges o f each retina. These pigment accumulations occurred independent o f the state o f light adaptation. Ultrastructurally the pigment granules at this accumulation site resemble distal screening pigment granules according to their size (up to 1.2 jim in diameter) and fibrous structure. Distal screening pigment granules were also found in tube-like cell processes or ex-tracellularly within and proximal to the retinal basement membrane, indicating pigment trans­ port to and across the basement membrane. Proximal to the basement membrane screening pigment granules were also observed disintegrated to a gravel-like electron dense material in widely branched cells. Evidence was found that an electron dense material, probably resulting from disintegrating screening pigment granules, was incorporated in the integument o f the eyestalk. Four hours after injection o f gold particles into the eye stalk distal to the retina they were detected inside and proximal to the retinal basement membrane. 
  Reference    Z. Naturforsch. 47c, 453 (1992); received June 13 1991/February 11 1992 
  Published    1992 
  Keywords    Electron Microscopy, Crayfish, Distal Screening Pigment Granules, Basement Membrane, Crystalline Cone 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0453.pdf 
 Identifier    ZNC-1992-47c-0453 
 Volume    47