Abstract：
:During conjugation, Stylonychia mytilus undergoes repetitive somatic development by reorganizing the cortical ciliature consecutively for three times. The control of these reorganizations by the nucleus was investigated employing amicronucleates generated by microsurgery. When amicronucleates conjugate, they underwent only the first round of cortical reorganization; the exconjugants perished before the second cortical reorganization commenced. This shows that the micronucleus is dispensable for the first cortical reorganization, but that the micronucleus, or its divisional derivatives in sexual nucleogenesis, are essential for immediate postconjugational survival. Conjugation of amicronucleates with micronucleates in most cases resulted in the arrest of macronuclear anlage development at the post-polyteny DNA-poor stage; the second cortical reorganization could not be initiated in such cells. In others where the macronuclear anlage developed beyond the post-polyteny DNA-poor stage, the cell underwent the second, and then the third round of cortical reorganization. This correlation between macronuclear anlage development and the second cortical reorganization argues for a causal relationship between the two. Very likely, the macronuclear anlage up to the post-polyteny DNA-poor stage provides the crucial morphogenetic signal(s) for the second cortical reorganization. The nature of the first and second rounds of cortical reorganization are thus fundamentally different from each other, as their nuclear controls are radically dissimilar.
journal_name
Eur J Protistoljournal_title
European journal of protistologyauthors
Lu L,Shi XB,Ng SFdoi
10.1016/S0932-4739(11)80154-9subject
Has Abstractpub_date
1991-02-22 00:00:00pages
330-9issue
3-4eissn
0932-4739issn
1618-0429pii
S0932-4739(11)80154-9journal_volume
26pub_type
杂志文章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 Javan ferret-badger Melogale orientalis (Carnivora: Mustelidae: Helictidinae) is a small carnivore endemic to Indonesia. In the family Mustelidae, 10 Eimeria, 12 Cystoisopora, one Isospora, and one Hammondia species are known, but no eimeriid coccidia has been yet described in the subfamily Helictinidae (ferret ba...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2019.125668
更新日期：2020-04-01 00:00:00
abstract：:A new colpodid ciliate, Bresslauides pratensis n. sp., was discovered in soil from a meadow field in Turkey. Its morphology was investigated using live observation, protargol impregnation, silver nitrate impregnation, and scanning electron microscopy. The new species differs from the congeners by the following combina...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2012.01.006
更新日期：2012-08-01 00:00:00
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：:Cell division in Prorocentrum micans was studied with TEM, SEM and with fluorescence microscope techniques to visualize cytoskeletal structures. The cleavage furrow consists of the plasma membrane and two valvar vesicles. Its leading edge is lined with actin filaments. The completion of cytokinesis (like in some other...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/S0932-4739(11)80175-6
更新日期：1990-03-09 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：:Rumen protozoal diversity in the Spanish ibex (SI) was studied in males (n=4), females (n=7) and young (n=4) from the Maestrazgo (Spain) and contrasted with domestic goats (n=3; DG) of the same region. There were no differences among SI types in protozoal concentration or in the number of protozoal species. Only proto...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2008.07.001
更新日期：2009-05-01 00:00:00
abstract：:Difflugia is a morphologically diverse genus of testate amoebae, which are common components of freshwater ecosystems. We observed a new morphotype similar to Difflugia tuberspinifera but without spine in four Xiamen reservoirs, Fujian Province, southeast China. We investigated its morphology and biometry using light ...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2013.12.003
更新日期：2014-04-01 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：:We collected Rimaleptus binucleatus from soil in the surroundings of the town of Ulsan, South Korea. Its morphology and 18S rRNA gene were studied using standard methods. This possibly widely distributed species is characterized by: (i) a size of about 170-400×20-65μm; (ii) a narrowly to cylindrically dileptid body wi...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2014.07.003
更新日期：2014-10-01 00:00:00
abstract：:It is well established that in ombrotrophic bogs, water-table depth (WTD) is the primary environmental control on testate amoeba distribution. However, the environmental controls on testate amoebae in minerotrophic fens are less well known and successional change in their assemblages associated with fen-bog peatland d...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2018.07.003
更新日期：2018-10-01 00:00:00
abstract：:Licnophora chattoni, found in association with Zyzzyzus warreni, a tubulariid hydroid epizoic in sponges from São Sebastião (SP, Brazil), is redescribed and illustrated using light and electron microscopy. The ciliate has a flexible, transparent body formed by an oval anterior region linked to the posterior basal disc...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2011.07.004
更新日期：2012-01-01 00:00:00
abstract：:A strain of the free-living flagellate Dimastigella trypaniformis Sandon was isolated from the gut contents of the Australian termite Mastotermes darwiniensis Froggatt. The fine structure of the isolate (Ulm strain) was compared with a strain isolated from soil in Scotland (Glasgow strain). The biflagellated trophozoi...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/S0932-4739(11)80404-9
更新日期：1993-11-12 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：: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：:Species in the genera Hexasterias and Halodinium have been recorded over the last decades as acritarchs in palynological and/or plankton studies. In paleoenvironmental studies, these resting stages are often interpreted as indicators of freshwater input. The biological affinity of these genera has never been definitel...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2018.09.002
更新日期：2018-10-01 00:00:00
abstract：:Differences in gel electrophoretic mobility were used to compare tubulin subunits from a variety of distantly related ciliate species. The relative electrophoretic mobility of ciliate tubulins is shown to vary depending upon the electrophoretic conditions used to separate them. Tubulin migration is altered by changing...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/S0932-4739(11)80271-3
更新日期：1993-05-28 00:00:00
abstract：:In the absence of distinct morphological characteristics, knowledge of genetic relationships within and between protist parasite species is important for determining reservoir hosts and understanding the biology of the causative agents of emerging diseases. The genus Hematodinium is a member of Syndinea, an ubiquitous...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2009.10.002
更新日期：2010-01-01 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：:The morphology, ontogenesis, conjugation, and phylogenetic position of Metopus boletus nov. spec. were studied using live observation, various silver impregnation methods, scanning electron microscopy, morphometry, and the 18S rRNA gene sequence. The new species is outstanding in having a mushroom-like appearance; a g...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2019.04.002
更新日期：2019-06-01 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：: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
abstract：:Light- and electron microscopical observations on the morphology of the nassulid ciliate Furgasonia blochmanni show that it has somatic kinetids which reveal the nassulid pattern of somatic mono- and dikinetids with a 'B-cartwheel' in the lumen of the kinetosome and paired alveolocysts as regular components of the kin...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/S0932-4739(88)80012-9
更新日期：1988-12-01 00:00:00
abstract：:Vertical variations in trophic-functional patterns of biofilm-dwelling ciliates were studied in coastal waters of the Yellow Sea, northern China. A total of 50 species were identified and assigned to four trophic-functional groups (TFgrs): algivores (A), bacterivorous (B), non-selective (N) and raptors (R). The trophi...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2018.01.003
更新日期：2018-04-01 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：:In a study on ciliate diversity, we discovered the new hypotrich species, Gonostomum jangbogoensis n. sp., in freshwater from Terra Nova Bay, Victoria Land, southeast Antarctica. We describe its morphology and morphogenesis using standard methods, and the SSU rRNA gene phylogeny is provided as well. Morphology of Gono...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/j.ejop.2019.125669
更新日期：2020-04-01 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：:This review gives a brief report on some recent advances in the study of molecular biology of ciliate genes. The main emphasis will be put on those results which may contribute to a better understanding of how gene structure and genome organization has evolved in ciliates. New data will be discussed in relation to the...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/S0932-4739(11)80384-6
更新日期：1990-08-31 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：:The behavior of Euplotes crassus has been studied qualitatively and quantitatively in an attempt of throwing new light onto the problem of the relationships occurring among motor behavior, systematic position and evolutionary strategies of the ciliated protozoa. It was found that both single and paired Euplotes creep ...
journal_title：European journal of protistology
pub_type： 杂志文章
doi：10.1016/S0932-4739(88)80056-7
更新日期：1988-03-01 00:00:00
