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  • 1
    Electronic Resource
    Electronic Resource
    Mineral congregations, “spherites” in the midgut gland ofCoelotes terrestris (Araneae): Structure, composition and function (1988)
    Springer
    Protoplasma 143 (1988), S. 43-50 
    Details
    ISSN: 1615-6102
    Keywords: Coelotes terrestris ; Midgut gland ; Spherites ; Histochemistry ; Calcium phosphate ; Detoxification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Spherites in the digestive and secretory cells of the midgut gland of the agelenid spiderCoelotes terrestris were studied by electron microscopy and histochemical methods. Spherites measured 1–6 μm in diameter and were characterized by alternating layers of electron dense and electron lucent material. The main-components of spherites were calcium phosphates and calcium carbonates. Guanine and barium, as well as aminopeptidase and alkaline phosphatase were also present. The matrix consisted of proteins and carbohydrates. Numerous spherites were found together with excretory products within the excretory vacuoles of the digestive cells. Spiders fed with food containing lead, showed deposition of the metall in the spherites. It is then proposed that spherites, aside from their role in storing calcium and other ions, may function in detoxification of heavy metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282958
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    Paper (German National Licenses)
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  • 2
    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)
    Fulltext
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