Noticia sobre o Nyctotherus cordiformis Stein

Aragão, Henrique de Beaurepaire

doi:10.1590/s0074-02761912000100009

Cited by 11 publications

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“…Generally, it can be assumed that all work on the cultivation of the Nyctotherus species has used xenic cultures, which means that various microbes, mainly prokaryotes, were present in Nyctotherus cultures. Aragao [ 47 ] kept N. cordiformis from the frog Leptodactyllus ocellatus in Petri dishes with 0.5% egg white in 0.85% NaCl. He obtained a multiplication of the Nyctotheri usually in three to four days; they lived for up to a fortnight, and then either encysted or simply died.…”

Section: Discussionmentioning

confidence: 99%

Some Aspects of the Physiology of the Nyctotherus velox, a Commensal Ciliated Protozoon Taken from the Hindgut of the Tropical Millipede Archispirostreptus gigas

Kišidayová

Scholcová

Mihaliková

et al. 2023

Life

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In this paper, the growth requirements, fermentation pattern, and hydrolytic enzymatic activities of anaerobic ciliates collected from the hindgut of the African tropical millipede Archispirostreptus gigas are described. Single-cell molecular analysis showed that ciliates from the millipede hindgut could be assigned to the Nyctotherus velox and a new species named N. archispirostreptae n. sp. The ciliate N. velox can grow in vitro with unspecified prokaryotic populations and various plant polysaccharides (rice starch-RS, xylan, crystalline cellulose20-CC, carboxymethylcellulose-CMC, and inulin) or without polysaccharides (NoPOS) in complex reduced medium with soluble supplements (peptone, glucose, and vitamins). Specific catalytic activity (nkat/g of protein) of α amylase of 300, xylanase of 290, carboxymethylcellulase of 190, and inulinase of 170 was present in the crude protein extract of N. velox. The highest in vitro dry matter digestibility was observed in RS and inulin after 96 h of fermentation. The highest methane concentration was observed in xylan and inulin substrates. The highest short-chain fatty acid concentration was observed in RS, inulin, and xylan. In contrast, the highest ammonia concentration was observed in NoPOS, CMC, and CC. The results indicate that starch is the preferred substrate of the N. velox. Hydrolytic enzyme activities of N. velox showed that the ciliates contribute to the fermentation of plant polysaccharides in the gut of millipedes.

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Section: Discussionmentioning

confidence: 99%

Some Aspects of the Physiology of the Nyctotherus velox, a Commensal Ciliated Protozoon Taken from the Hindgut of the Tropical Millipede Archispirostreptus gigas

Kišidayová

Scholcová

Mihaliková

et al. 2023

Life

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Division and conjugation in Nyctotherus cordiformis (EHr.) Stein (Protozoa, Ciliata) with special reference to the nuclear phenomena

Wichterman

1937

Journal of Morphology

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ATJTHOIL'S ABSTRACTA cytological study of the complete life cycle of Nyctotherus cordiformis (Ehr.) Stein, a heterotrichous ciliate from the large intestine of tadpole and adult Hyla versicolor hosts is presented. I n division a partial dedifferentiation of parental ingestatory structures occure, then redserentiation to be retained by the anterior daughter. For the posterior daughtsy. the ingestatory appiratus arises de novo. I n conjugation, two ciliates fuse along their peristomes. The macronucleus undergoes complete fragmentation while the micronucleus divides three times. The first pregamic division results in two micronuclear products; the second division, four micronuclear products three of which degenerate. T h e remaining product enters into the third pregamic divisio'n to produce the two functional. migratory and stationary pronuclei. Interchange of migratory pronuclei follows at the fused anterior ends of the conju;ants to form the amphinucleus which divides once to produce the micronucleus and the macronuclear anlage. Development and behavior of the unusual macronuclear anlage ('epireme-ball' of Stein and Schneider) is described for the first time. At the end of the conjugation process, ingestatory structures of each conjugant completely deditTerentiste while a complete new set arises de nova posterior to the old ones. In this case, conjugation occurs only in tadpoles which are metamorphosing inta frogs. Conjugation here is interpreted as an effort made by the ciliates to overcome a physiological crisis during the drastic host transformation changes.

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Neue Versuche zur Züchtung der im Pansen von Wiederkäuern lebenden Ophryoscoleciden (Ciliata)

Knoth

1928

Z. F. Parasitenkunde

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Noticia sobre o Nyctotherus cordiformis Stein

Cited by 11 publications

References 0 publications

Some Aspects of the Physiology of the Nyctotherus velox, a Commensal Ciliated Protozoon Taken from the Hindgut of the Tropical Millipede Archispirostreptus gigas

Some Aspects of the Physiology of the Nyctotherus velox, a Commensal Ciliated Protozoon Taken from the Hindgut of the Tropical Millipede Archispirostreptus gigas

Division and conjugation in Nyctotherus cordiformis (EHr.) Stein (Protozoa, Ciliata) with special reference to the nuclear phenomena

Neue Versuche zur Züchtung der im Pansen von Wiederkäuern lebenden Ophryoscoleciden (Ciliata)

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