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  • 1995-1999  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Lagenidium callinectes (Couch, 1942) infection and its control in cultured larval Indian tiger prawn, Penaeus monodon Fabricius (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 19 (1996), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A mycosis in larval tiger prawn, Penaeus monodon Fabricius, is described for the first time from India. The hyphae of Lagenidium callinectes are contorted, irregularly branched, sparingly septate, and contain a cell wall and membrane, vacuoles, mito chondria, ribosomes, small and large vesicles, and Woronin bodies. The spores occur singly or in pairs. The fungal mycelium may either invade and embed itself in the tissues, or alternatively, replace all the muscle tissues of the infected larval P. monodon. Fungus infected, untreated populations of nauplii, zoea and myksis exhibited mortalities of 5.33 ± 0.55%, 24.68 ± 4.58% and 47.89 ± 0.27%, respectively. A 0.5 ppm treatment with trifluralin significantly reduced the mortality of infected larval populations (i.e. 1.1% nauplii, 3.28% zoea and 5.21% myksis mortality). Lagenidium sp. exhibited growth in potato dextrose agar medium and in Sabouraud's agar at 28 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1996.tb00122.x
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructure of the gut caecal epithelium of Pricea multae (Monogenea: Polyopisthocotylea) (1996)
    Springer
    Parasitology research 82 (1996), S. 312-318 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  Ultrastructural observations of the gut caecal epithelium of Pricea multae revealed the presence of pigmented and non-pigmented digestive cells. The pigmented digestive cells were separated by a connecting syncytium and appeared elongated,with numerous vesicles appearing toward the apical cell surface. They were characterised by granular inclusions in the form of electron-dense pigments, which were eliminated by exocytosis. These cells and their lamellar connecting syncytium were observed projecting into the gut lumen. Transverse sections of the gut epithelium revealed intact portions of digestive cells lying in the lumen. Endocytosis at the apical surface of the pigmented digestive cells gave rise to the formation of granular inclusions, which appeared as electron-dense pigments confined to lysosomal vesicles within the digestive system. Electron X-ray microanalysis indicated these granules were primarily composed of iron, demonstrating that P. multae is a blood-feeder. The connecting syncytium, while probably involved in a structural, supportive role, may additionally function in the absorption of micromolecular nutrients from the host blood meal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004360050119
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of the surface structures and electron immunogold labeling of peptide immunoreactivity in the nervous system of Pseudothoracocotyla indica (Polyopisthocotylea: Monogenea) (1996)
    Springer
    Parasitology research 82 (1996), S. 638-646 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  Transmission electron microscope studies of the tegument of the tropical marine fish monogenean parasite Pseudothoracocotyla indica describe surface specialisations and detail the ultrastructure of the tegument and the haptor. The tegument consists of a syncytium, numerous electron-dense granules, electron-lucent vesicles and large multivesicular bodies. The posterior tegumental syncytium is infolded to form tegumental ridges that are present on both the ventral and dorsal surfaces. A thin coat of glycocalyx is present on the tegument surface. In contrast, the tegumental syncytium of the haptor is relatively thin, containing electron-dense granules and various-sized electron-lucent vesicles. Exocytosis of the electron-dense and electron-lucent vesicles apparently occurs in the syncytium of the haptor and general body surface. Tegumental damage was observed on the dorsal surface in the mid-body region and may possibly have been due to natural mechanical forces. The haptor consists of electron-dense clamp sclerites embedded within a matrix covered by the tegumental syncytium. The sclerites are connected to each other and to the basal lamina by radially oriented muscle fibres. The haptor is richly supplied with non-myelinated nerve axons. Both uniciliated and non-ciliated presumed sensory structures are present on the body surface and haptor. Uniciliated sensory structures were found mainly around the oral sucker. Groups of neurons and nerve processes containing neurosecretory vesicles were frequently observed in the vicinity of the clamps. Electron immunogold labeling studies demonstrated that neuropeptide F [NPF (Moniezia expansa)] immunoreactivity was confined to electron-dense-cored neurosecretory vesicles in nerve fibres from the posterior and haptor regions of the fluke.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004360050178
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