Results 241 to 250 of about 285,581 (295)
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Resting Cysts: A Survival Strategy in Protozoa Ciliophora
Italian Journal of Zoology, 2011Abstract Encystment is a reversible cell differentiation process that also requires an antagonistic process, i.e. excystment. Both processes are genetically encoded. Encystment is of common occurrence among free-living ciliates and may serve several different purposes. In some ciliates, this process is part of the regular life cycle (reproductive cyst),
F Verni, G Rosati
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Symptomatic salivary-rest cyst of the sella turcica
Acta Neurochirurgica, 1995Although ectopic salivary tissue in the posterior pituitary is frequently observed in microscopic examination at autopsy, this tissue is considered clinically insignificant. The authors report a case of sella turcica mass causing progressive menstrual irregularities and mild hyperprolactinemia in a 22-year-old woman. Magnetic resonance imaging revealed
S B, Tatter +3 more
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The potential for dispersal of microalgal resting cysts by migratory birds
Journal of Phycology, 2018Most microalgal species are geographically widespread, but little is known about how they are dispersed. One potential mechanism for long‐distance dispersal is through birds, which may transport cells internally (endozoochory) and deposit them during, or in‐between, their migratory stopovers. We hypothesize that dinoflagellates, in
Tesson, Sylvie V. M. +5 more
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Toxin composition of resting cysts of Alexandrium tamarense (Dinophyceae)
Toxicon, 1992Paralytic shellfish toxin composition in the resting cysts of the dinoflagellate Alexandrium tamarense was investigated by means of high performance liquid chromatography. A comparison was made between cysts collected from ship ballast tank sediments, natural population of motile vegetative cells collected from the area where ballast water was taken ...
Y, Oshima, C J, Bolch, G M, Hallegraeff
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Stomatogenesis in Resting Cysts of Colpodidae
The Journal of Protozoology, 1966SYNOPSIS. The reorganization in resting cysts which produce a single emerging individual was followed in 5 species of Colpodidae forming a possible evolutionary series with increasing numbers of kineties. Stomatogenesis in Colpoda maupasi and C. inflata was studied for the first time; that in C. steinii, C.
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[An ultrastructural study on resting cyst of Euplotes encysticus].
Shi yan sheng wu xue bao, 1995For resting cysts of Euplotes encysticus, in their various ciliatures, most of the ciliary shafts above the cilia kinetosomes are degenerated, or preserve their kinetosomes only. Sometimes, kinetosomes of certain frontal and ventral cirri are also disintegrated and disappeared.
F K, Gu, B, Ni
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High biomass blooms in beaches: are resting cysts maintained in situ?
, 2014 Data derived from an extensive sampling campaign along the Sardinian coasts have allowed the identification of Alexandrium taylorii, Levanderina fissa and Barrufeta bravensis as the most wide ly distr ibute d cyst-for ming ha rmful species in the 74 beaches investigated in summer 2012.
Satta CT +10 more
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Journal of Eukaryotic Microbiology, 2003
ABSTRACT. The cyst wall of Opisthonecta henneguyi has been studied ultrastructurally and cytochemically by light and electron microscopy, as well as by chemical and electrophoretic analyses, to examine the structure of the cyst wall and its composition. The cyst wall consists of four morphologically distinct layers. The ectocyst is a thin dense layer.
Purificación, Calvo +3 more
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ABSTRACT. The cyst wall of Opisthonecta henneguyi has been studied ultrastructurally and cytochemically by light and electron microscopy, as well as by chemical and electrophoretic analyses, to examine the structure of the cyst wall and its composition. The cyst wall consists of four morphologically distinct layers. The ectocyst is a thin dense layer.
Purificación, Calvo +3 more
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The epithelial cell rests of Malassez and the genesis of the dental cyst
Oral Surgery, Oral Medicine, Oral Pathology, 1972Abstract Activation of the epithelial cell rests of Malassez, both in vivo and in vitro, involves a switch in their metabolism and the utilization of the hexose-monophosphate shunt. This response of the epithelial rests is common to other epithelia when their supporting connective tissue is altered.
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Ciliates from ancient permafrost: Assessment of cold resistance of the resting cysts
European Journal of Protistology, 2015There is evidence that resting cysts of soil ciliates and numerous taxa of other protists can survive in permafrost for thousands of years at subzero temperatures; however, our knowledge about mechanisms of long term cryobiosis remains incomplete. In order to better understand the means by which ancient cysts survive, we investigated resistance to ...
Shatilovich, Anastasia +2 more
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