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513012. Ultrastructure of developmental stages of Hemolivia mariae (Apicomplexa: Haemogregarinidae), natural parasite of the Australian sleepy lizard, in experimentally infected deviant hosts
- Creator:
- Paperna, Ilan and Smallridge, Catherine J.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Haemogregarinidae, Hemolivia mariae, ultrastructure, merogony, gametocytes, wall development, and osmiophilic bodies
- Language:
- English
- Description:
- Mabuya vitatta (Olivier) (Scincidae) and Agama stellio (L.) (Agamidae) were infected with Hemolivia mariae Smallridge et Paperna, 1997 by ingestion of tick viscera from Amblyomma limbatum Neumann, fed as nymphs on naturally infected Australian sleepy lizards, Tiliqua rugosa Gray. The unnatural infection apparently interfered with the developmental schedule of the parasites. Transmission electron microscopic images of merogonic stages were obtained, as well as images of early developing gametocytes. Tissue and intraerythrocytic meronts were bound by a hardened wall. Intraerythrocytic gametocytes were lodged in a parasitophorous vacuole, which was filled with granular material, and were bound by a two-membrane wall. Small and large osmiophilic bodies were located in a sub-pellicular position. With differentiation, the wall membranes tightened with the parasitophorous vacuole wall, and the osmiophilic bodies disappeared. The outer parasite membrane consolidated into a thick encasing with distinct sutures. Late infection in A. stellio comprised gametocytes only.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513013. Ultrastructure of glands in a scutaricllid (Platyhelminthes) and possible phylogenetic implications
- Creator:
- Iomini, Carlo, Ferraguti, Marco, and Justine, Jean-Lou
- Format:
- Type:
- model:internalpart and TEXT
- Subject:
- Platyhelminthes, Temnocephalida, Scutariellidae, ultrastructure, and glands
- Language:
- English
- Description:
- Subepidermal glands of the body of Troglocaridicola sp. (from the cavemicolous shrimp Troglocaris sp. in eastern Italy) were observed by transmission electron microscopy. The reservoir and duct of the glands arc lined with longitudinal microlubulcs. Membrane-bound granules inside the gland show a distinctive pattern: they contain fibres, 18 nm in diameter, regularly arranged in bundles with a 5 nm space between libres. From a survey of the available literature on glands of Platyhelminthes, it is concluded that this structure is known only in this species. Glands with regularly arranged 18 nm fibres, if characteristic for the Scutariellidae, could be considered an autapomorphy of this family, distinguishing it from other members of the Temnocephalida.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513014. Ultrastructure of grape-vine (VHis vinifera) chloroplasts under Mg- and Fe- deficiencies
- Creator:
- Guller, L. and Krucká, M.
- Format:
- Type:
- model:internalpart and TEXT
- Language:
- Multiple languages
- Description:
- In mesophyll chloroplasts of control plants of grape vine (Vilis vinifera L.) growing in greenhouse, grana consisted of 3-10 thylakoids interconnected by long stroma thylakoids. Chloroplasts in magnesium-deficient plants were characterized by a dense stroma, poorly distinquished fme stroma lamellae, and by an accumulation of large osmiophilic globules. Under iron deficiency, the chloroplasts exerted two types of damage of intemal structure: (7) grana consisted of 2-6 thylakoids, the stroma lamellae were destructed; (2) grana were reduced, the stroma lamel ae were broken into short thick fragments, that were laid successively in the direction along the axis of the chloroplasts.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513015. Ultrastructure of microtriches on the scolex of Cyathocephalus truncatus (Cestoda: Spathe-bothriidea)
- Creator:
- Levron, Céline, Scholz, Tomáš, and Dezfuli, Bahram S.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- English
- Description:
- The scolex surface of the mature spathebothriidean Cyathocephalus truncatus (Pallas, 1781), a parasite of the brown trout Salmo trutta fario L., was studied using scanning and transmission electron microscopy. A particular attention was paid to microtriches, unique structure on the surface of the Cestoda. The scolex of C. truncatus is covered with two types of filiform microtriches (filitriches): aciculate (≈ 3 µm long) and capillate (≈ 10 µm long). Capillate microtriches, which have never been reported in any other spathebothriideans, are described for the first time using transmission electron microscopy. The tegument covered with filiform microtriches only (no spiniform microtriches are present) is typical of cestode groups supposed to be the most basal, e.g., Gyrocotylidea, Spathebothriidea, and Caryophyllidea.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513016. Ultrastructure of pigmented photoreceptor of adult Crepidostomum metoecus (Trematoda: Digenea: Bunoderidae)
- Creator:
- Žďárská, Zdeňka and Nebesářová, Jana
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513017. Ultrastructure of spermiogenesis and mature spermatozoon of Triaenorhina rectangula (Cestoda: Cyclophyllidea: Paruterinidae)
- Creator:
- Yoneva, Aneta, Georgieva, Katia, Nikolov, Pavel N., Mizinska, Yana, Georgiev, Boyko B., and Stoitsova, Stoyanka R.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Cestoda, Cyclophyllidea, Paruterinidae, Triaenorhina rectangula, ultrastructure, spermiogenesis, and spermatozoon
- Language:
- English
- Description:
- Ultrastructural characters of spermiogenesis and mature spermatozoon of Triaenorhina rectangula (Fuhrmann, 1908) are examined by transmission electron microscopy. Spermiogenesis follows the Bâ and Marchand's Type III spermiogenesis of cestodes. The process begins with the formation of a differentiation zone containing two centrioles and a cytoplasmic protrusion. The centrioles are associated with vestigial striated roots. One of the centrioles develops a free flagellum externally to the cytoplasmic protrusion. After a slight rotation, the free flagellum fuses with the cytoplasmic protrusion. In the final stage of spermiogenesis, a single crested body appears in the anterior part of the differentiating spermatozoon. The anterior extremity of the mature spermatozoon is characterised by an apical cone and a single crested body. The axoneme is of the 9+''1'' trepaxonematan type. A periaxonemal sheath and electron-dense rods are described in some parts of the mature spermatozoon. The nucleus is electron-dense and spirally coiled around the axoneme. The cortical microtubules are spirally arranged at an angle of about 40° to the spermatozoon axis. The present results show that the ultrastructural characters of spermiogenesis and mature spermatozoon of T. rectangula resemble most closely those in taeniids and metadilepidids. The comparison of these results with the only previous spermiological description of a paruterinid species reveals differences relative to the occurrence of filamentous rods of electron-dense material versus intracytoplasmic walls in the mature spermatozoon that may reflect the polyphyletic character of the Paruterinidae.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513018. Ultrastructure of spermiogenesis and spermatozoa of Discocotyle sagittata (Monogenea: Polyopisthocotylea: Discocotylinea)
- Creator:
- Cable, Joanne and Tinsley, Richard C.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Platyhelminthes, TEM, fluorescent nuclear labelling, spermatogenesis, and spermatozoon
- Language:
- English
- Description:
- Ultrastructural analysis revealed that the spermatozoon of Discocotyle sagittata (Leuckart, 1842) is composed of two parallel axonemes, mitochondrion, nucleus and cortical microtubules. The nucleus, which occupies a central/distal position and has an unusual crescent-shaped profile, is slightly shorter than the mitochondrial rod. The two axonemes, which are of unequal length, and the cortical microtubules (up to 68 forming a continuous ring in the principal region) extend almost the entire length of the spermatozoon. A fold of the plasma membrane creates a unilateral flange or undulating membrane. Epifluorescence microscopy indicated that spermatogenesis gives rise to clusters of 64 spermatids connected to a common cytophore. Spermiogenesis and the structure of the filiform sperm of D. sagittata conform to the typical polyopisthocotylean pattern.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513019. Ultrastructure of spermiogenesis of Phyllobothrium lactuca (Cestoda, Tctraphyllidea, Phyllobothriidae)
- Creator:
- Séne, Aminata, Ba, Cheikh Tidiane, and Marchand, Bernard
- Format:
- Type:
- model:internalpart and TEXT
- Subject:
- ultrastructure, Phyllobothrium, Cestoda, Tetraphyllidea, and spermiogenesis
- Language:
- English
- Description:
- Spermiogenesis in Phyllobothrium lactuca Beneden, 1850 begins with the formation of a differentiation zone bordered by cortical microtubules and containing a nucleus and two ccntrioles separated by an intercentriolar body and disposed one in the prolongation of the other. Later, formation of flagellar buds, striated roots and a median cytoplasmic extension takes place. Each centriole gives rise to a flagellimi that rotates and fuses with the median cytoplasmic extension. At this stage, arched membranes appear at the front of the differentiation zone. The nucleus elongates, becomes filiform and migrates between the striated roots into the spermatid. After the migration of the nucleus, the old spermatid separates from the residual cytoplasm by strangulation of the ring of arched membranes. Absence of striated roots, right at the beginning of spermiogenesis has never been described before in the Tctraphyllidea. Likewise, centrioles made up of doublets of microtubules and spermatids with two axonemes have never been reported before during spermiogenesis of a Phyllobothriidae. In this work we show, for the first time, the existence in cestodes of thick-walled microtubulcs surrounded by a layer of electron-dense material. In addition, we describe, for the first time, the existence of an accumulation of electron-dense granules around striated roots and an hour-glass-shaped constriction at the anterior extremity of a median cytoplasmic extension in a platyhelminth.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
513020. Ultrastructure of the anterior organ and posterior funnel-shaped canal of Gyrocotyle urna Wagener, 1852 (Cestoda: Gyrocotylidea)
- Creator:
- Poddubnaya, Larisa G, Roman Kuchta, Bristow, Glenn A, and Tomáš Scholz
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- skenovací elektronová mikroskopie, transmisní elektronová mikroskopie, fylogeneze, scanning electron microscopy, transmission electron microscopy, phylogeny, basal cestodes, ultrastructural characters, 2, and 59
- Language:
- English
- Description:
- Using scanning and transmission electron microscopy, ultrastructure of the anterior organ and posterior funnel-shaped canal of Gyrocotyle urna Wagener, 1852 (Cestoda: Gyrocotylidea) from ratfish, Chimaera monstrosa (Holocephali), was studied for the first time. The proper anterior organ is localised at a short distance (about 170 µm) from an apical pore surrounded by a receptor field, whereas its distal end is marked by a muscular sphincter. The tegumental surface of this organ is covered with short filitriches of irregular length; large area of muscle layers traverse beneath the tegumental layer. The funnel-shaped canal of G. urna (2.5-3.0 mm long) is a specialised, muscular part of the posterior attachment organ; it opens on the rounded elevation on the dorsal body surface. The tegumental layer bears conical sclerite-like structures (up to 1.5 µm long). It produces electron-dense bodies that are transported into a canal lumen and surrounded thick muscle area mixed with numerous nerve fibres. The present ultrastructural study of G. urna indicates that gyrocotylideans share some ultrastructural characters of the anterior organ with spathebothriidean cestodes with a single anterior attachment sucker-like organ. In contrast, the unique posterior rosette attachment organ with funnel-shaped canal of the Gyrocotylidea resembles the haptor of polyopisthocotylean monogeneans in its position at the posterior end of the body and presumed origin. The above-mentioned features add more clarity to support the basal position of the Gyrocotylidea Poche, 1926 among cestodes. In addition, they also indicate a possible relationship of gyrocotylidean ancestors with monogeneans., Larisa G. Poddubnaya, Roman Kuchta, Glenn A. Bristow, Tomáš Scholz., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public