Die pathogenen Coccidien

Hartmann, Max; Schilling, Claus

doi:10.1007/978-3-642-91293-1_13

Cited by 13 publications

(4 citation statements)

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“…In naming this amoeba I am following Hartmann and Schilling's (1917) description for Vahlkampfia and putting it in that genus, which was first described by Chatton and Lalung-Bonnaire (1912). For a specific name I propose patuxent since the amoeba was found in the oysters from the Patuxent River, near Baltimore.…”

Section: Systematic Positionmentioning

confidence: 99%

“…Elles ont des kystes uninuclees.' ' Hartmann and Schilling (1917) give a somewhat fuller description, but with the same essential points. Doflein (1916), however, brings in the presence of a flagellate stage: "Besonders bemerkenswert ist ihre Fahigkeit in einen begeisselten freischwimmenden Zustand iiberzugehen."…”

Section: Systematic Positionunclassified

“…Doflein (1916), however, brings in the presence of a flagellate stage: "Besonders bemerkenswert ist ihre Fahigkeit in einen begeisselten freischwimmenden Zustand iiberzugehen." Neither Chatton and Lalung-Bonnaire (1912) nor Calkins (1912) nor Hartmann and Schilling (1917) include this stage in their description of Vahlkampfia. I therefore feel justified in placing this amoeba among the Vahlkampfia, since, so far, no flagellate stage has been observed in Vahlkampfia patuxent.…”

Section: Systematic Positionmentioning

confidence: 99%

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Studies on the Life History of Vahlkampfia Patuxent N.SP., Parasitic in the Oyster, With Experiments Regarding Its Pathogenicity*

Hogue¹

1921

American Journal of Epidemiology

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Section: Systematic Positionmentioning

confidence: 99%

Section: Systematic Positionunclassified

Section: Systematic Positionmentioning

confidence: 99%

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Studies on the Life History of Vahlkampfia Patuxent N.SP., Parasitic in the Oyster, With Experiments Regarding Its Pathogenicity*

Hogue¹

1921

American Journal of Epidemiology

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“…However, in spite of the fact that the authenticity of " Uronema caudatum" as a human parasite has been disputed by a number of protozoologists, it still continues to find a place in some text-books, on the assumption that under certain conditions free-living ciliates (and other Protozoa) may become adapted to a parasitic existence. This attitude is illustrated by the following remark of Hartmann and Schilling (1917): "Vermutlich handelt es sich...um ein gelegentliches parasitares Vorkommen einer fur gewohnlich freilebenden Art." One of the difficulties in estimating the value of such views is that very little is known regarding the ability of ciliates to pass unharmed through the mammalian alimentary canal or of their capability for living in faecal matter already discharged, though many ciliates are known to thrive in various kinds of decomposing organic matter.…”

mentioning

confidence: 99%

Studies on Coprozoic Ciliates

Hoare

1927

Parasitology

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This paper contains a revision of the morphology and classification of three species of holotrichous ciliates, Lembus pusillus, Cyclidium glaucoma and Uronema nigricans (=Uronema marina Dujardin, 1841=Cryptochilum nigricans Maupas, 1883=U. marina et U. marinum auctorum, pro parte), together with various observations on their biology. The revised data on these species are summarised in the diagnoses preceding their description.The close resemblance between U. nigricans and the other species described has led to its transfer from the family Chiliferidae to the family Pleuronemidae.Cyst formation in L. pusillus is described for the first time. The cysts, when fully formed, are provided with a double-layered wall, to which the body of the ciliate is more or less closely adherent. When preserved in dry condition, the cysts retain the same structure and are able to hatch after several months. Excystation is brought about by active rupture of the cyst-wall on the part of the ciliate. The primary cyst does not, however, afford adequate protection to the ciliate in a fluid medium. After remaining in the latter about three weeks, the animal secretes a cyst of the second order, in which it remains viable some time longer, but if left in the fluid, the ciliate ultimately dies, gradually breaking up into a number of granules.In order to establish the relationship of the marine and fresh-water forms of the same species, experiments on their acclimatisation to the opposite environment were conducted. The fresh-water U. nigricans adapted itself to pure sea water within 12 days and developed for 12 months in this medium, in which it is still being maintained. The marine U. nigricans was gradually transferred to fresh water, in which it was kept for 60 days. Observations on the morphological changes undergone by this ciliate in the course of acclimatisation show that the fresh-water forms living in sea water gradually acquire the habitus of the marine ones, and that the latter undergo the reverse change in fresh water. The characters distinguishing the two strains of U. nigricans being insignificant and transitory, the two forms are regarded as constituting a single species.The fresh-water L. pusillus required eight days for acclimatisation to sea water, in which it was maintained for 163 days without exhibiting any morphological changes.Attempts to acclimatise the fresh-water C. glaucoma to pure sea water failed, but in 50 per cent, sea water it grew for 130 days. The morphological and biological differences between the fresh-water and marine strains of C. glaucoma are probably sufficient for them to be regarded as sub-species or races.Experiments were conducted on the cultivation of these ciliates in faecal matter from normal and diseased human subjects, and varying widely in consistency. Tests on the influence of the reaction of the medium upon the growth of the ciliates showed that they prefer a slightly alkaline medium (pH 7·4–8·0), but are able to tolerate an increase of alkalinity up to pH 9·0–10·0, whilst the acidification of the medium beyond pH 5·0 inhibits their growth.As regards the facility with which these ciliates grew in faecal cultures, Lembus occupied the first place, having developed in the majority (64 per cent.) of samples of pure (i.e. undiluted) faeces, and in all those slightly diluted with water. The second place belongs to Uronema, which grew in all the diluted specimens and in one undiluted, whereas Cyclidium was unable to grow in pure faeces, but developed in about half of the diluted samples. All these ciliates were successfully cultivated in suspensions of human and animal faeces.The coprozoic habits of the ciliates in question are compared with the records for “Uronema caudatum,” comprising a number of ciliates described by some authors as human intestinal parasites. It is shown that the conditions under which these ciliates were observed indicate that they were coprozoic forms that had contaminated the material examined. Though described under the name “U. caudatum” these ciliates represent at least two distinct genera, those recorded by Martini being similar to Cyclidium or Uronema, the ones described by Yakimoff et al. probably representing Lembus pusillus.The last-named ciliarte having been originally found in a sample of canine faeces, experiments were carried out with the view of ascertaining its origin. It was demonstrated that the ciliate was unable to withstand incubation at 37°C. for 24 hours, and, when fed to mice in the form of cysts, did not survive the passage through their intestine. These facts indicate that the faeces in which Lembus was found must have been contaminated by this ciliate from outside.

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Fortpflanzung der Tiere unter Berücksichtigung der Pflanzen

Korschelt¹

1926

Fortpflanzung Entwicklung Und Wachstum

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Die pathogenen Coccidien

Cited by 13 publications

References 1 publication

Studies on the Life History of Vahlkampfia Patuxent N.SP., Parasitic in the Oyster, With Experiments Regarding Its Pathogenicity*

Studies on the Life History of Vahlkampfia Patuxent N.SP., Parasitic in the Oyster, With Experiments Regarding Its Pathogenicity*

Studies on Coprozoic Ciliates

Fortpflanzung der Tiere unter Berücksichtigung der Pflanzen

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