Abstract:
:Expression of surface antigens is usually mutually exclusive, meaning that only one protein is present on the cell surface. With the RNAi feeding technology we induce serotype shifts in Paramecium tetraurelia which are demonstrated to be incomplete, meaning that the cells remain in a shifting state. The coexpression of "old" and "new" protein on the surface can be detected to be stable for more than 15 divisions over a 5-day feeding procedure, a time period different from that reported for temperature-induced shifts. A characteristic heterogenic distribution of the different surface antigens is demonstrated by double indirect-immunofluorescent-staining and we show antigen transport mechanisms related to the tips of cilia. Therefore, we discuss release mechanisms, potential sorting mechanisms for glycosylphosphatidylinositol-anchored proteins and the localizations of surface antigens, which are important for the reported classical immobilization reaction.
journal_name
Eur J Protistoljournal_title
European journal of protistologyauthors
Simon MC,Marker S,Schmidt HJdoi
10.1016/j.ejop.2005.09.003subject
Has Abstractpub_date
2006-03-01 00:00:00pages
49-53issue
1eissn
0932-4739issn
1618-0429pii
S0932-4739(05)00091-Xjournal_volume
42pub_type
杂志文章abstract::Gravitaxis of Paramecium at different oxygen concentrations is analyzed by means of a computer controlled image-analysis system. The gravitactic response depends on the oxygen tension: at low-oxic conditions Paramecium shows a precise negative gravitaxis which changes into a random distribution if the oxygen tension i...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(11)80065-9
更新日期:1991-09-09 00:00:00
abstract::The gene coding for the small subunit ribosomal RNA molecule was sequenced in three marine spirotrichs: Pseudoamphisiella lacazei, P. alveolata, and Parabirojimia similis, the systematic positions of which remain unclear in spite of recent progress. Phylogenetic trees were constructed by means of neighbor-joining (NJ)...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2007.08.002
更新日期:2008-02-01 00:00:00
abstract::Acanthamoebae feed on bacteria but are also frequent hosts of bacterial symbionts. Here, we describe the stable co-occurrence of two symbionts, one affiliated to the genus Parachlamydia and the other to the candidate genus Paracaedibacter (Alphaproteobacteria), within a clinical isolate of Acanthamoeba hatchetti genot...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2016.04.002
更新日期:2016-10-01 00:00:00
abstract::The route of infection of two endonucleobiotic bacteria in Paramecium caudatum was investigated with the electron microscope. The bacterium Holospora elegans specifically infects the micronucleus, whereas Holospora obtusa infects the macronucleus. The infectious forms of both bacteria are ingested by the prospective h...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(89)80037-9
更新日期:1989-02-24 00:00:00
abstract::Planktonic testate amoebae in floodplains exhibit a broad-range of morphological variability. The variation size is already known, but it is necessary to know how this is for morphological variables. This study aimed to identify the relationships between testate amoebae morphology and environmental factors in four neo...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2016.08.006
更新日期:2016-10-01 00:00:00
abstract::Protistan parasites have an undisputed global health impact. However, outside of a few key exceptions, e.g. the agent of malaria, most of these infectious agents are neglected as important health threats. The Symposium entitled "Free-living amoebae and neglected pathogenic protozoa: health emergency signals?" held at ...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2020.125760
更新日期:2020-11-28 00:00:00
abstract::Apostome ciliates from crayfish and freshwater shrimp in southern and central Alabama were surveyed in this study. Hyalophysa bradburyae was found on both crayfish and shrimp from 16 sites in eight drainages. A new species, Hyalophysa clampi n. sp., was found infesting crayfish at one site and simultaneously infesting...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2011.11.005
更新日期:2012-08-01 00:00:00
abstract::Since its description 35 years ago from Quebec, Canada, the poorly known monospecific testate rhizopod genus Puytoracia (type species, Puytoracia bergeri) has been reported only from the Himalayan region of Nepal. This species was recently found at 13 locations in Ontario, Canada, and the range of form variation of th...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2006.04.002
更新日期:2006-09-01 00:00:00
abstract::Neoparamoeba perurans is the aetiological agent of amoebic gill disease (AGD) in salmonids, however multiple other amoeba species colonise the gills and their role in AGD is unknown. Taxonomic assessments of these accompanying amoebae on AGD-affected salmon have previously been based on gross morphology alone. The aim...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2018.10.003
更新日期:2019-02-01 00:00:00
abstract::Pterospora demodendrion sp.nov., an acephaline eugregarine (Eugregarinorida, Urosporidae) from the coelom of Axiothella mucosa (Polychaeta, Maldanidae) is described. The gamont averages 277 × 139 μm and possesses 20-36 posterior prolongations. Gametocysts average 412 × 287 μm; without polar funneled openings. Oocysts ...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(11)80427-X
更新日期:1991-03-28 00:00:00
abstract::The ultrastructural cytology and reproduction of the hyperparasitic microsporidium Amphiamblys capitellides (Caullery and Mesnil, 1897) is described. Merogonial reproduction was not observed. The sporogony comprises two sequences: a sac-bound sporogony in close contact with the cytoplasm of the host and a free sporogo...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2006.07.001
更新日期:2006-11-01 00:00:00
abstract::This paper summarises the Symposium 'Concepts in Protistology', during the VI European Congress of Protistology, Berlin, 25-29 July 2011. There is an increasing focus on cataloguing the number of species on earth, species barcoding initiatives, and the increasing need to reconcile molecular with morphological data in ...
journal_title:European journal of protistology
pub_type:
doi:10.1016/j.ejop.2011.11.004
更新日期:2012-05-01 00:00:00
abstract::The authors present light and electron microscopical data on a myxosporidian found in the gills of Crenicichla lepidota Heckel, 1840 (Teleostei, Cichlidae) from the Amazon river. Based on the spore morphology, it is concluded that this species belongs to the family Myxobolidae, genus Henneguya, and that it constitutes...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(11)80233-6
更新日期:1992-08-21 00:00:00
abstract::Resting cysts of Parentocirrus hortualis were investigated, using live observation, SEM and TEM. Processes during encystation and excystation were observed in vivo under the light microscope. During encystation, the trophic body becomes globular, the ciliature is resorbed in an anterior direction, the macronuclear nod...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2015.12.003
更新日期:2016-04-01 00:00:00
abstract::We observed reproductive swarmer cells of the nassellarian and spumellarian polycystine radiolarians Didymocyrtis ceratospyris, Pterocanium praetextum, Tetrapyle sp., and Triastrum aurivillii using light, scanning and transmission electron microscopy. The swarmer cells had subspherical to ovoid or spindle shapes with ...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2016.02.007
更新日期:2016-06-01 00:00:00
abstract::Two new marine scuticociliates, Sathrophilus planus n. sp. and Pseudoplatynematum dengi n. sp., isolated from coastal waters of Qingdao, northern China, were investigated using live observation and silver impregnations. Sathrophilus planus can be recognized by its elongate and conspicuously flattened body, ca. 16 soma...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2010.03.002
更新日期:2010-08-01 00:00:00
abstract::A new Naegleria species, N. andersoni, is described that occurs world-wide. The new species consists of two subspecies and can be distinguished from previously described species on the basis of antigenic, isoenzyme and restriction enzyme DNA fragment differences and in maximum growth temperature tolerated. N. anderson...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(88)80022-1
更新日期:1988-10-01 00:00:00
abstract::A new species of unicellular opisthokont protist, Nuclearia thermophila sp. nov., was isolated from the warm spring water of Yunoko Lake, Japan, and has been described using light and electron microscopy. It exists as a spherical floating form and a flattened amoeboid form showing various shapes. The cells occasionall...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2008.09.004
更新日期:2009-05-01 00:00:00
abstract::We report the use of nile red as a rapid and inexpensive method to estimate cellular lipids in three species of Paramecium and in Tetrahymena by the direct application of the dye to living or fixed cells without extraction and purification. Qualitative estimates of the relative changes in the lipid content of cells of...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(11)80129-X
更新日期:1990-06-29 00:00:00
abstract::The infraciliature and morphogenesis of Paraholosticha sterkii (Garnjobst, 1934) n. comb. (Basionym: Stylonethes sterkii) are described. Before division a cell encysts and after division each tomite forms an individual cyst within the common one. The ciliates cease to move and the kinetome is resorbed. With the beginn...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(88)80038-5
更新日期:1988-07-01 00:00:00
abstract::During the last decades, the planktonic cyanobacterium Planktothrix rubescens became a dominant primary producer in many deep pre-alpine lakes. While altered physiochemical conditions due to lake warming seem to favour this cyanobacterial species, its dominance is partly attributed to factors conferring grazing resist...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2017.05.009
更新日期:2017-08-01 00:00:00
abstract::The free-living ciliates of the order Metopida Jankowski, 1980 are pivotal players in the microbial food web of the sulfuretum, acting as hosts to prokaryotic endo- and ectosymbionts. They are also of interest in the study of the function and evolution of their mitochondrion-related organelle, the hydrogenosome. The t...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2017.07.003
更新日期:2017-10-01 00:00:00
abstract::The endonucleobiotic bacterium Holospora elegans inhabits the micronucleus of Paramecium caudatum. In this paper the release of the infectious form (IF) of H. elegans from its host is described. During the anaphase of the micronuclear division most of the IFs remain within the connecting piece which, therefore, may be...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(89)80021-5
更新日期:1989-10-27 00:00:00
abstract::The morphology and morphogenesis of a marine ciliate, Epiclintes auricularis rarisetus nov. sspec., collected from Qingdao, northern China were studied on live and protargol-impregnated specimens. This isolate can be recognized by its elongate, contractile and tripartite body with a size of 200-400 x 20-40microm in vi...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2009.01.005
更新日期:2009-11-01 00:00:00
abstract::Five scuticociliates, collected from China, were morphologically studied using standard methods One represents a new member of the genus Falcicyclidium, F. citriforme nov. spec., which can be recognised mainly by a combination of the following characters: usually two macronuclear nodules, buccal field about half of bo...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2017.03.003
更新日期:2017-06-01 00:00:00
abstract::Microbial eukaryotes living in low oxygen environments often have novel physiological and morphological features that facilitate symbiotic relationships with bacteria and other means for acquiring nutrients. Comparative studies of these features provide evidence for phylogenetic relationships and evolutionary history....
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2012.07.001
更新日期:2013-01-01 00:00:00
abstract::For many years, the genus Massisteria (Cercozoa, Leucodictyida) comprised only one species, M. marina. This small species has a biphasic life cycle and feeds through filose, radiating pseudopodia. It has a distinct swimming form and is regularly detected in association with detritus aggregates. However, environmental ...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2015.05.002
更新日期:2015-08-01 00:00:00
abstract::Copidognathus nautilei Bartsch, 1997, from a hydrothermal vent field of the Mid-Atlantic Ridge at about 13 degrees N, 45 degrees W and 4090 m depth, was infested with the suctorian Corynophrya abyssalis n. sp., with up to 58 epizoans per mite. The new suctorian has a sacciform body with seven longitudinal ribs, a comp...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/j.ejop.2010.02.001
更新日期:2010-08-01 00:00:00
abstract::A new ciliate species (Cyclidium porcatum) is the first freshwater anaerobic scuticociliate to be cultured and described. It contains a unique tripartite structure consisting of hydrogenosomes (confirmed by cytochemical staining for hydrogenase), interspersed with methanogens (confirmed by auto fluorescence and in sit...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(11)80281-6
更新日期:1993-05-28 00:00:00
abstract::Fine structure of the membrane system was examined in a large heliozoon, Echinosphaerium akamae, especially by means of negative staining and thin sectioning under the electron microscope. In addition to solitary membranous organelles such as mitochondrion, Golgi apparatus and nuclear envelope, there was found a conti...
journal_title:European journal of protistology
pub_type: 杂志文章
doi:10.1016/S0932-4739(89)80047-1
更新日期:1989-02-24 00:00:00