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  • 1
    Electronic Resource
    Electronic Resource
    Fine structure of spermatozoa and spermatogenesis ofSchizomus palaciosi, Reddell and Cokendolpher, 1986 (Arachnida: Uropygi, Schizomida) (1987)
    Springer
    Protoplasma 137 (1987), S. 1-14 
    Details
    ISSN: 1615-6102
    Keywords: Arachnida ; Acrosome ; Coiling ; Filaments ; Schizomus ; Spermatogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Spermatogenesis ofSchizomus palaciosi occurs in cysts in paired tubular testes located ventrally in the opisthosoma. Only few germ cells comprise one cyst. In early spermiogenesis an acrosomal complex composed of a spherical vacuole and a short acrosomal filament is established opposite of which a 9×2+3 flagellum emerges from a flagellar tunnel. The latter, however, is only a short-lasting structure. A manchette of microtubules surrounds nucleus and part of the acrosomal vacuole. The alterations in the arrangement of the microtubules during spermiogenesis are described. The spermatid finally is an elongate cell with a slender acrosomal vacuole on top of the helical nucleus. A deep implantation fossa filled with dense material is encountered. The acrosomal vacuole is accompanied by an intricate paracrosomal lattice structure not known at present of otherArachnida. This structure disappears during final spermiogenesis. The acrosomal filament (perforatorium) reveals filamentous subunits arranged in a regular pattern. Large ovoid mitochondria do not establish a distinct middle piece. Finally the elongate spermatid is coiled to form the mature spherical spermatozoon. The results are discussed under functional and taxonomical aspects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281172
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The stress-70 protein family in diplopods: induction and characterization (1996)
    Springer
    Journal of comparative physiology 165 (1996), S. 622-627 
    Details
    ISSN: 1432-136X
    Keywords: Cadmium ; Stress-70 ; hsp70 ; Two-dimensional gel electrophoresis ; Diplopod, Julus scandinavius
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To induce stress-70 proteins (hsp70), adults of the millipede Julus scandinavius (Diplopoda) were exposed to leaf litter contaminated with different concentrations of Cd2+ (10, 30, 50 and 60 mg·kg-1 as CdCl2). The expression of hsp70 was investigated by semiquantitative and qualitative biochemical methods. After SDS-gel electrophoresis and Western blotting a subsequent digital image analysis showed that increasing dietary concentrations of Cd2+ resulted in elevated levels of hsp70, which in turn indicated proteotoxic condition. Qualitative results were obtained by two-dimensional gel electrophoresis. A stress-70 protein family, similar to that of other arthropods, was detected in Julus scandinavius: at least five different proteins with an approximate molecular weight of 68, 69, 70, 77, and 78 kDa could be distinguished after heat shock as well as after Cd2+ exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301130
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    Paper (German National Licenses)
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