Open Access. Powered by Scholars. Published by Universities.®
- Publication Year
- Publication
- Publication Type
- File Type
Articles 1 - 15 of 15
Full-Text Articles in Life Sciences
Olfactory Organ Morphology And Ultrastructure Of The Larval Koh Tao Island Caecilian (Ichthyophis Kohtaoensis), Jaclyn M. Patmore
Olfactory Organ Morphology And Ultrastructure Of The Larval Koh Tao Island Caecilian (Ichthyophis Kohtaoensis), Jaclyn M. Patmore
Cal Poly Humboldt theses and projects
The olfactory system of living amphibians (Lissamphibia) undergoes major changes as it transitions from an aquatic to a terrestrial system during metamorphosis. Patterns of change in the cellular morphology of the nose have been examined for frogs (Anura) and salamanders (Caudata). However, it remains unknown if caecilians (Gymnophiona) have similar patterns of change in their nasal ultrastructure. In particular, no data on larval caecilian olfactory cell types are available. Here, using light microscopy and transmission electron microscopy, I examined the olfactory organ of larvae of the caecilian Ichthyophis kohtaoensis, to establish the ultrastructure of the epithelium and compare it …
Fine Structure Of The Malpighian Tubules In Gryllus Campestris(Linnaeus, 1758) (Orthoptera, Gryllidae), Irmak Polat, Nurcan Özyurt, Damla Amutkan, Zeki̇ye Suludere, Selami̇ Candan
Fine Structure Of The Malpighian Tubules In Gryllus Campestris(Linnaeus, 1758) (Orthoptera, Gryllidae), Irmak Polat, Nurcan Özyurt, Damla Amutkan, Zeki̇ye Suludere, Selami̇ Candan
Turkish Journal of Zoology
The Malpighian tubules are responsible for excretion and osmoregulation in insects. The Malpighian system consists of tubules that are closed at the distal end and extend from the point of junction of the midgut and hindgut. This organ helps the water and electrolyte balance of the internal metabolism by filtration with absorption of water and soluble materials as mineral salts from the hemolymph. In this study, the histology of Malpighian tubules in Gryllus campestris (Orthoptera, Gryllidae) has been examined in detail by light microscopy, scanning electron microscopy, and transmission electron microscopy. The distal ends of the Malpighian tubules in G. …
Ultrastructure Of The Reproductive System Of The Black Swamp Snake (Seminatrix Pygaea): Part Ii. Annual Oviducal Cycle, David Sever, Travis Ryan, Deborah Patton, Shannon Swafford
Ultrastructure Of The Reproductive System Of The Black Swamp Snake (Seminatrix Pygaea): Part Ii. Annual Oviducal Cycle, David Sever, Travis Ryan, Deborah Patton, Shannon Swafford
Travis J. Ryan
This article is the first ultrastructural study on the annual oviducal cycle in a snake. The ultrastructure of the oviduct was studied in 21 females of the viviparous natricine snake Seminatrix pygaea. Specimens were collected and sacrificed in March, May, June, July, and October from one locale in South Carolina during 1998–1999. The sample included individuals: 1) in an inactive reproductive condition, 2) mated but prior to ovulation, and 3) from early and late periods of gravidity. The oviduct possesses four distinct regions from cranial to caudal: the anterior infundibulum, the posterior infundibulum containing sperm storage tubules (SSTs), the uterus, …
Ultrastructure Of The Reproductive System Of The Black Swamp Snake (Seminatrix Pygaea). I. Evidence For Oviducal Sperm Storage, David Sever, Travis Ryan
Ultrastructure Of The Reproductive System Of The Black Swamp Snake (Seminatrix Pygaea). I. Evidence For Oviducal Sperm Storage, David Sever, Travis Ryan
Travis J. Ryan
Oviducal sperm storage in the viviparous (lecithotrophic) colubrid snake Seminatrix pygaea was studied by light and electron microscopy. Out of 17 adult snakes examined from May–October, sperm were found in the oviducts of only two specimens. In a preovulatory female sacrificed 14 May, sperm were found in the oviducal lumen and sperm storage tubules (SSTs) of the posterior infundibulum. In a nonvitellogenic female sacrificed 9 June, sperm were found in the lumen and glands of the posterior uterus and anterior vagina, indicating a recent mating. The glands in the posterior infundibulum and vagina were simple or compound tubular, whereas glands …
An Ultrastructural Study On The Merogonic Stages Of Goussia Senegalensis (Faye, 1988) Diouf And Toguebaye, 1993 (Apicomplexa, Coccidia) From The Liver Of Pagellus Bellottii (Pisces, Teleostei), Jacques Ngor Diouf, Bhen Sikina Toguebaye
An Ultrastructural Study On The Merogonic Stages Of Goussia Senegalensis (Faye, 1988) Diouf And Toguebaye, 1993 (Apicomplexa, Coccidia) From The Liver Of Pagellus Bellottii (Pisces, Teleostei), Jacques Ngor Diouf, Bhen Sikina Toguebaye
Turkish Journal of Zoology
Little is known about the merogony of coccidians from fishes in Africa. To our knowledge, including both freshwater and marine fishes, developmental stages have been recorded for only Goussia cichlidarum, Cryptosporidium sp. parasitizing the stomachs of juvenile cichlid fish, and Eimeria (s. l.) vanasi. A survey of coccidians parasitizing marine fishes from the coast of Senegal (West Africa) was done between 1988 and 1992 and samples of infected organs were collected for further transmission electron microscopy observations. Merogonic stages were observed. Goussia senegalensis undergoes merogony in the hepatic cells of Pagellus bellottii as follows: meronts develop inside the cytoplasm of …
Transmission Electron Microscopic Study Of Renal Haemopoietic Tissues Of Channa Punctatus (Bloch) Experimentally Infected With Two Species Of Aeromonads, Rajarshi Ghosh, Sumit Homechaudhuri
Transmission Electron Microscopic Study Of Renal Haemopoietic Tissues Of Channa Punctatus (Bloch) Experimentally Infected With Two Species Of Aeromonads, Rajarshi Ghosh, Sumit Homechaudhuri
Turkish Journal of Zoology
The ultrastructural pathological changes in the renal haemopoietic tissue of Channa punctatus (Bloch) experimentally infected with 2 species of aeromonads, Aeromonas hydrophila and Aeromonas salmonicida, were reported. Adult C. punctatus specimens were injected intramuscularly, once at a time, with a chosen sublethal dose (2 × 10^9 cfu mL^-^1) of aeromonads at 5 µL g^-^1 body weight of fish and were exposed to 72 h of duration. The leucocytes (especially macrophages and melanomacrophages) and other associated cells from the pronephric head kidney of aeromonad-infected C. punctatus were studied by fixed ultrathin sections for transmission electron microscopy. The sinusoidal cells, barrier cells, …
Morphological And Ultrastructural Changes In Tissues Of Intermediate And Definitive Hosts Infected By Protostrongylidae, Abdurakhim Ergashevich Kuchboev, Eric P. Hoberg
Morphological And Ultrastructural Changes In Tissues Of Intermediate And Definitive Hosts Infected By Protostrongylidae, Abdurakhim Ergashevich Kuchboev, Eric P. Hoberg
Turkish Journal of Zoology
Cellular and subcellular mechanisms involved in tissue responses to larval and adult lungworms (Protostrongylidae) were respectively explored through experimental and natural infections in molluscan intermediate (Xeropicta candacharica) and ruminant definitive hosts (Ovis aries). Reaction to developing larval stages in the gastropod is manifested as cellular infiltration involving lymphocytes and macrophages into the infected tissue, which restricts damage and may result in destruction and elimination of parasites from the intermediate host. Variations in the patterns of localization for infective third-stage larvae in the foot tissue of the intermediate host are described. In the definitive host, evaluation of lung tissue by histology …
Descriptive Characteristics Of Haemopoietic Cell Lineages In A Facultative Air Breathing Fish Clarias Batrachus (L.), Krishna Gangopadhyay, Sumit Homechaudhuri
Descriptive Characteristics Of Haemopoietic Cell Lineages In A Facultative Air Breathing Fish Clarias Batrachus (L.), Krishna Gangopadhyay, Sumit Homechaudhuri
Turkish Journal of Zoology
Haemopoietic tissues of the head kidney of Clarias batrachus were studied for morphometric analysis and ultrastructural descriptions of the erythropoietic and leucopoietic cell populations. Eight successive steps of developing erythrocytes from small lymphoid haemoblasts (SLHs) to mature erythrocytes (MEs) were distinguished. Progressive loss of RNA and synthesis of haemoglobin during haemopoiesis were coupled with denser nucleus and changes in cellular shapes. Transmission electron microscopy aided in clear distinction between cell lineages in the development of erythrocytes, granulocytes, and lymphocytes. Ultrastructural analysis of the pronephric stromal cells forming adherent multilayer of haemopoietic microenvironment was explicit in describing their ability to promote …
The Histochemical And Ultrastructural Effects Of Cadmium On Mouse Edl Muscle, Fati̇me Geyi̇koğlu, Aysel Temelli̇, Özgen Vuraler, Hasan Türkez
The Histochemical And Ultrastructural Effects Of Cadmium On Mouse Edl Muscle, Fati̇me Geyi̇koğlu, Aysel Temelli̇, Özgen Vuraler, Hasan Türkez
Turkish Journal of Zoology
The histochemical and ultrastructural effects of cadmium (Cd) on the extensor digitorum longus (EDL) muscles of male mice were investigated. Two doses of Cd (0.1 and 1.0 x 10^{-4} M) were injected into the mice. The animals were killed at the end of 48 h and their EDL muscles excised. Three types of fibers (I, IIA and IIB) were described by the succinic dehydrogenase (SDH) method in the control groups. The mitochondrial and sarcotubular contents of the fibers were different. The histochemical and ultrastructural characteristics of the EDL muscles in mice given Cd did not differ from those of the …
Histological, Histochemical And Ultrastructural Investigations On The Esophagus Of Juvenile Rainbow Trout (Oncorhynchus Mykiss), Fati̇me Geyi̇koğlu, Özgen Vuraler, Aysel Temelli̇
Histological, Histochemical And Ultrastructural Investigations On The Esophagus Of Juvenile Rainbow Trout (Oncorhynchus Mykiss), Fati̇me Geyi̇koğlu, Özgen Vuraler, Aysel Temelli̇
Turkish Journal of Zoology
The histology of the esophagus of Oncorhynchus mykiss was studied. The structure of the esophagus exhibited differences as well as similarities when compared with previous studies. In this study, the histochemical and ultrastructural structure of the tunica muscularis externa in the esophagus of this fish is investigated. The muscle fibers are described as red and intermediate fibers according to the pH stability of their mATPase activities. The red fibers showed intense staining, while intermediate fibers showed moderate staining with succinic dehydrogenase (SDH) and toluidine blue. In addition, small diameter fibres were seen. These indicated to be the continuation of development …
Ultrastructural Observations On The Development Of Some Actinosporean Types Within Their Oligochaete Hosts, Ahmet Özer, Rodney Wootten
Ultrastructural Observations On The Development Of Some Actinosporean Types Within Their Oligochaete Hosts, Ahmet Özer, Rodney Wootten
Turkish Journal of Zoology
Synactinomyxon type 1, aurantiactinomyxon type 3, echinactinomyxon type 5 and raabeia type 4 were studied at the TEM level in order to determine the developmental stages within their oligochaete hosts. All the actinosporean types studied had uninucleate cells as the earliest stage of development. The formation of a subsequent binucleate cell stage was either due to the division of the nucleus in a uninucleate cell or the plasmogamy of two uninucleate cells. The earliest pansporocyst formation seen was two outer somatic cells surrounding two inner generative \alpha and \beta cells in all the actinosporean types studied. However, the formation of …
Ultrastructure Of 'Turbellaria' (Platyhelminthes), Regina Pfistermuller
Ultrastructure Of 'Turbellaria' (Platyhelminthes), Regina Pfistermuller
Electronic Theses and Dissertations
The systematics of turbellarian platyhelminths (also known as free-living flatworms) has proven difficult since few taxonomically useful characters can be discerned in them. Generally, features of the reproductive tract, observed through conventional light microscopy, provide key taxonomic characters. Through the newer techniques of electron microscopy and fluorescence microscopy, new characters are emerging that provide better clues to the phylogenetic relationships of these animals. We have applied both of these microscopies to representatives of two groups of turbellarians whose phylogenetic positions are uncertain and controversial, the Acoela and the Genostomatidae. Because fluorescence microscopy of phalloidin-labeled acoel turbellarians has provided new taxonomically …
The Effects Of Precocene Ii On The Fine Structure Of Corpus Allatum In Adult Female Anacridium Aegyptium L. (Orthoptera, Acrididae), Gürsel Ergen
Turkish Journal of Zoology
In this study, the effects of the antijuvenile hormone Precocene II on the corpus allatum of adult females of Anacridium aegyptium L. (Orthoptera) were investigated with electron microscopy. In the insects, topically treated with 500 µg precocene II, the corpora allata did not show marked atrophy or destruction. After 10 or 20 days of precocene II treatment, the ultrastructural changes of especially the nuclei, mitochondria, endoplasmic reticulum membranes, Golgi complexes and some other intracellular organelles in the gland cells, probably reflect a moderate sensitivity to this compound.
Ultrastructure Of The Cortex Of The Rumen Ciliate Ophryoscolex Purkynjei Stein, 1858 (Entodiniomorphida: Ophryoscolecidae), Gürsel Ergen, Bayram Göçmen, Beri̇a Falakali Mutaf
Ultrastructure Of The Cortex Of The Rumen Ciliate Ophryoscolex Purkynjei Stein, 1858 (Entodiniomorphida: Ophryoscolecidae), Gürsel Ergen, Bayram Göçmen, Beri̇a Falakali Mutaf
Turkish Journal of Zoology
The ultrastructure of the cortex of Ophryoscolex purkynjei,an entodiniomorphid ciliate obtained from domesticated cattle rumens, was studied and found to have five layers. A particulate and/or filamentous glycocalyx layer, triple membrane layer, homogeneous epiplasmic layer with very fine grains, microtubular layer characterized with a double row of microtubule bundles each containing at most 6 units, and a compact microfilamentous layer were identified. In addition, scarce and disorganized kinetosomes and related microtubules were found to lie underneath all of these. These observations are discussed with reference to the findings of previous studies of other entodiniomorphid ciliates.
The Electron Microscopic Structures Of The Two Ciliated Species Living Endocommensally In The Digestive System Of Rana Ridibunda (Amphibia-Anura), Naci̇ye Gülkiz Şenler, Ni̇met Öktem
The Electron Microscopic Structures Of The Two Ciliated Species Living Endocommensally In The Digestive System Of Rana Ridibunda (Amphibia-Anura), Naci̇ye Gülkiz Şenler, Ni̇met Öktem
Turkish Journal of Zoology
In this study ultrastructures of Balantidium elongatum and B.duodeni obtained from the digestive system of Rana ridibunda have been examined. In addition to the kinetodesmal fibril and microtubular fibrils orijinating from each kinetosome, a vacuolar zone, microtubular bundles and other cytoplasmic structures have been described by electron microscopy.