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  • 1
    Electronic Resource
    Electronic Resource
    Extracellular Calcium Concentration Affects Infectivity of Ichthyophthirius (Ciliophora) Theronts (1991)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 38 (1991), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Tomonts and their theront offspring of the hymenostomatid fish parasite Ichthyophthirius multifiliis were exposed to calcium levels from 0 to 0.8 mM Ca2+. The survival and reproductive rates of tomonts in the absence of extracellular calcium were not significantly different from rates of tomonts provided calcium. Theronts that developed in the absence of calcium, however, were not infective for Ictalurus punctatus even when the extracellular magnesium concentration was doubled. Theronts that developed in 0.10 mM Ca2+ were infective (0.77 trophonts/mm2 of pectoral fin) to essentially the same extent as theronts provided 0.33 mM Ca2+. Infectivity of those provided 0.8 mM Ca2+ was 1.79 trophonts/mm2 of fin, similar to that of theront controls. Theronts deprived of extracellular calcium as they developed contained significantly fewer secretory mucocysts than did theronts provided 0.1 to 0.8 mM Ca2+ although no significant differences among groups occurred with respect to abundance of crystalline or differentiating mucocysts. Theronts deprived of extracellular calcium also had swollen or enlarged mitochondria and abnormal crystalline mucocysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1991.tb04426.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ichthyophthirius multifiliis (Ciliophora) Development in Gill Epithelium (1986)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The development of Ichthyophthirius multifiliis trophonts in gill epithelium of channel catfish was studied on the first five days post-exposure (PE) by light and electron microscopy. Trophonts increased in average diameter from 48 μm at one day PE to 248 μm at five days PE. Although theronts invaded any part of the gill epithelium, at three days PE most parasites were found adjacent to major blood vessels, particularly the afferent vessel. From one to three days PE, 70–90% of trophonts were immediately adjacent to gill epithelium, but at four and five days PE only 50% of trophonts were closely apposed by host epithelial cells. Notable ultrastructural changes in the trophonts over the five-day period occurred in the mucocysts and lipid inclusions, both of which increased markedly in number. The few crystalline mucocysts present at one day PE were near the cell periphery but rarely attached to the plasma membrane. At three days PE, crystalline mucocysts were significantly more abundant, and at five days PE, they occurred in large numbers throughout the cytoplasm as well as at the periphery. At three days PE, secretory mucocysts were first observed. Contractile vacuoles were more prominent at five days PE than earlier in development. Development of mucocysts and lipid reserves is probably essential to survival and reproduction of the ciliate after it leaves the host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1986.tb05625.x
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  • 3
    Electronic Resource
    Electronic Resource
    Critical Periods in Development of Ichthyophthirius multifiliis (Ciliophora) Populations (1986)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Three periods in development that strongly influence population dynamics of Ichthyophthirius multifiliis were identified in experimental infections of channel catfish. The first occurred upon establishment within the host, 0 to 10 min postexposure (PE), when the parasite population that gained entrance declined 50%. Survival from 10 to 45 min PE, however, was constant. The second period identified came after I. multifiliis left the host and the free-living tomont encysted. The third occurred during reproduction. Although survival of encysting tomonts approached 100% among individuals departing after three to five days residence in the host, theront production varied significantly with parasite size, culture temperature during development, and length of residence by the trophont in the host. Theront production per tomont increased daily and on days three, four, and five PE was significantly higher for parasites developing at 24°C than for those at 21°C. At five days PE, mean production was 562 theronts/tomont and 240 theronts/tomont, respectively, and production by tomonts of equal size was greater for parasites maintained at 24°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1986.tb05628.x
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  • 4
    Electronic Resource
    Electronic Resource
    Ichthyophthirius multifiliis (Ciliophora) Invasion of Gill Epithelium (1985)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 32 (1985), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The sequence of morphologic events associated with Ichthyophthirius rnultifliis invasion of gill epithelium began in the theront with differentiation of secretory mucocysts and the perforatorium. After escaping from the cyst the theront, which stained intensely with Mallory' stain, sought a host. As it approached the host epithelium, the contents of the mucocysts were discharged, enveloping the ciliate in sticky material, which made initial contact with the host epithelium. Rapid penetration by the theront caused disruption of one or more host cells and resulted in a focal necrosis associated with the anterior margin of the ciliate. Within five minutes postexposure, the parasite completed its invasion of the epithelial layer and stained less intensely. The remnants of host cells disrupted during its entry surrounded the trophont until they were ingested by the parasite. Within 40 min postexposure, synthetic activity of the parasite appeared to increase as evidenced by an abundance of organelles, particularly ribosomes and crystalline mucocysts. At this point, the overlying host epithelium appeared normal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1985.tb03055.x
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  • 5
    Electronic Resource
    Electronic Resource
    Ichthyophthirius multifiliis (Ciliophora) Exit from Gill Epithelium (1987)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 34 (1987), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The first change in the sequence of morphological events occurring as fully developed Ichthyophthirius multifiliis trophonts spontaneously left gill epithelium or as younger trophonts departed, following experimentally induced death of the fish, was the separation of parasites from overlying host cells. Discharge of contractile vacuoles may have played a role in this process. Spaces then appeared between host cells, and individual epithelial cells became vacuolated. Finally, the epithelium ruptured and the parasites swam free. In induced exit after three days residence in the host, departure of the trophont was evident only after autolysis of epithelium had occurred. Induced departure of trophonts after four days residence was more rapid, suggesting an active role for the parasite in exit. Changes in parasite and epithelium observed in induced exit were similar to those in spontaneous departure after five days residence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1987.tb03181.x
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  • 6
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    Characterization of Histone H3/H4 Gene Region and Phylogenetic Affinity of Ichthyophthirius multifiliis Based on H4 DNA Sequence Variation (2000)
    Elsevier
    Details
    Publication Date: 2000-03-01
    Print ISSN: 1055-7903
    Electronic ISSN: 1095-9513
    Topics: Biology
    Published by Elsevier
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