Publications by authors named "Atef Omar"
The morphology, morphogenesis, molecular phylogeny, and the resting cyst morphology of the freshwater ciliate, Crassohymena primicirrata (Berger and Foissner, 1987) n. gen., n.
View Article and Find Full Text PDFDuring a survey of Korean marine ciliates, Trochilia sigmoides, the type species of the genus Trochilia, was collected and examined using in vivo observation and protargol impregnation. Moreover, scanning electron microscopy and 18S rRNA gene sequencing have been applied for the first time to study this species. Morphologically, T.
View Article and Find Full Text PDFArticle Synopsis
- A new ciliate species, Aspidisca koreana n. sp., was identified off the eastern coast of South Korea, with detailed studies on its morphology and molecular phylogeny.
- The morphological features were characterized through observations of living cells and various staining techniques, revealing specific traits such as its small size and unique cirri arrangement.
- Phylogenetic analysis using 18S rDNA sequences confirmed its classification as a distinct species, following the typical morphogenetic patterns of the genus.
The living morphology, infraciliature, and molecular phylogeny of a new soil ciliate, Hemiurosomoida koreana n. sp., discovered in a sample collected from a mountain in the northeast of South Korea, were investigated.
View Article and Find Full Text PDFArticle Synopsis
- - The study investigates a newly identified polymorphic and cannibalistic species from brackish water in South Korea, previously misidentified, revealing three distinct morphs based on morphology and feeding habits.
- - The small morph, which is found during declining culture phases, is bacterivorous and has a slim body; the large morph, found in exponential culture phases, consumes small eukaryotes and quickly produces other morphs; while the giant morph, also associated with the small morph, feeds on smaller cells of its own species.
- - Phylogenetic analysis using 18S rRNA gene sequences places this new species in a unique subclade, and distinctions in cyst morphology and dorsal ciliature have led to the elevation of
A new marine ciliate was discovered from intertidal mudflat from South Korea. Based on the observation of living cells, protargol-impregnated specimens and SEM, we describe it as new species belonging to the genus Diophrys Dujardin, 1841, namely Diophrys pauciciliata n. sp.
View Article and Find Full Text PDFThe morphology and molecular phylogeny of two new ciliates, gen. nov., sp.
View Article and Find Full Text PDFThe morphology, ontogenesis, and molecular phylogeny of a new ciliate, Pseudostylonychia obliquocaudata n. gen., n.
View Article and Find Full Text PDFArticle Synopsis
- - A new species (n. sp.) was discovered in a hypersaline marine sample from Jeju Island, Korea, notable for having fewer dorsal bristles and an absent or indistinct alveolar layer.
- - Researchers used modern morphological and molecular methods, analyzing a large dataset of 1,460 DNA sequences, to determine its identity and evolutionary relationships within the hypotrichs.
- - The study suggests that the reduced dorsal bristles evolved independently as an adaptation to hypersaline environments, but the researchers decided not to create a new genus due to insufficient data and non-monophyly issues.
The morphology, ontogenesis, and molecular phylogeny of a new ciliate, Gonostomum koreanum n. sp., discovered in a terrestrial moss sample from South Korea, were investigated.
View Article and Find Full Text PDFArticle Synopsis
- Scientists discovered a new marine ciliate species, Anteholosticha foissneri n. sp., during a study in Vietnam.
- This species is similar to Anteholosticha monilata-like organisms in terms of macronuclear and micronuclei arrangement, but can be differentiated by the unique features of its cortical granules.
- The study revealed a new type of cell division in this ciliate that’s not previously documented, suggesting it belongs to a distinct evolutionary group within its family.
Smart coaching in martial arts is one of the recent research areas in Human Motion Analysis. Numerous moves are performed incorrectly during the performance. In this paper we offer a system that will record the Players' movements using IR (Infrared) camera sensor, store the data in a database, pre-process the data, classify the data using F-DTW (Fast Dynamic Time Warping) and then show the users an accurate report that contains every movement the player had done, their mistakes and how to improve their performance the next time.
View Article and Find Full Text PDFArticle Synopsis
- - A new ciliate species, Cyrtohymena seorakensis sp. n., was found in moss from South Korea and has unique features like fewer yellowish cortical granules and a specific number of adoral membranelles.
- - The species consistently has four transverse cirri and an average of 62 dorsal bristles, setting it apart from related species.
- - Phylogenetic analysis using 18S rDNA sequences indicated that this new species is closely related to an Indian population of C. citrina.
The morphology and molecular phylogeny of sp. nov., which was discovered in soil from Gagye Beach, South Korea, were investigated.
View Article and Find Full Text PDFIn a study of ciliate diversity, we collected two new species of the genera Australothrix and Holostichides. Based on nuclear ribosomal genes, our study shows that these two genera are genetically non-monophyletic. To clarify the issues of the non-monophyly, we reexamined type material of H.
View Article and Find Full Text PDFThe morphology and infraciliature of a new ciliate, Metopus yantaiensis n. sp., discovered in coastal soil of northern China, were investigated.
View Article and Find Full Text PDFArticle Synopsis
- This text introduces two new taxa of the genus Drepanomonas: Drepanomonas hymenofera with two subspecies (one from Venezuela and the other from Iceland), and Drepanomonas vasta found in Austria's tree hole mud.
- Both taxa are described with specific size, shape, and structural characteristics.
- The study also clarifies taxonomic relationships, determining that the genus Pseudocristigera is a junior synonym of Drepanomonas and discusses distinguishing features for these species.*
Neotypification and ontogenesis of Leptopharynx costatus costatus Mermod, 1914.
J Eukaryot Microbiol
September 2012
Using standard methods, we studied the morphology and ontogenesis of a German Leptopharynx costatus costatus. This population makes two morphs: microstomes with a size of 40 × 25 μm, about 190 basal bodies, and 5 μm wide oral basket; and macrostomes with a size of 55 × 40 μm, about 264 basal bodies, and 15 μm wide oral basket. Because the identity is threatened, this population is designated as the neotype of L.
View Article and Find Full Text PDFUsing standard morphological methods, we describe one new Leptopharynx species and a new subspecies of L. costatus, both from soil of the neotropic region. Further, we studied two populations of L.
View Article and Find Full Text PDF