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Start Over Coverage 241-250

2. Fine structure of the male reproductive ducts, vagina and seminal receptacle of Cyathocephalus truncatus (Cestoda: Spathebothriidea)

Creator:
Poddubnaya, Larisa G., Mackiewicz, John S., Bruňanská, Magdaléna, and Dezfuli, Bahram S.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Cyathocephalus truncatus, ultrastructure, male ducts, accessory glands, vagina, and seminal receptacle
Language:
English
Description:
Fine structure of the vas efferens, vas deferens, ejaculatory duct with accessory glands and vagina with seminal receptacle is described in the spathebothriidean tapeworm, Cyathocephalus truncatus (Pallas, 1781) Kessler, 1868. The numerous well-developed prostate glands are characterised by having secretory granules with an electron-dense core surrounded by a matrix of lower electron density. Coalescence of the outer part of the granules with each other takes place in the terminal end of the secretory ducts. The position of prostate glands around the proximal part of the cirrus pouch and terminating in the ejaculatory duct is a characteristic feature of the Spathebothriidea. Up to 20 closely arranged muscle layers make up the muscular cirrus pouch wall with 4 well-developed muscular layers in the ejaculatory duct and cirrus. Both the cirrus and the vagina are covered with the same uniform cone-shaped microtriches. The vagina has an extensive seminal receptacle. All of these structures are well-adapted to insure successful sperm transfer involving ejaculation and storage, probably for both self- and cross-insemination. Cyathocephalus truncatus has a cirrus similar to that of the monozoic, progenetic caryophyllidean, Archigetes sieboldi and well-developed prostate glands like those of the polyzoic pseudophyllidean, Diphyllobothrium latum. The ultrastructural aspects of the male and female reproductive system of C. truncatus are compared with those of other tapeworms.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Fixed point results on a metric space endowed with a finite number of graphs and applications

Creator:
Argoubi, Hajer, Samet, Bessem, and Turinici, Mihai
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
fixed point, graph, metric space, order, and cyclic map
Language:
English
Description:
In this paper, we consider self-mappings defined on a metric space endowed with a finite number of graphs. Under certain conditions imposed on the graphs, we establish a new fixed point theorem for such mappings. The obtained result extends, generalizes and improves many existing contributions in the literature including standard fixed point theorems, fixed point theorems on a metric space endowed with a partial order and fixed point theorems for cyclic mappings.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

4. Leishmania tropica (Kinetoplastida: Trypanosomatidae) - a perplexing parasite

Creator:
Jacobson, Raymond L.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Leishmania tropica, Phlebotomus, and cutaneous leishmaniasis
Language:
English
Description:
Leishmania tropica is one of the causative agents of cutaneous leishmaniasis (CL), a disfiguring parasitic disease that recently was found to be viscerotropic. In urban areas it is transmitted from infected individuals by the bite of phlebotomine sand flies to naïve persons (anthroponotic CL). In rural areas animals are thought to be the reservoir, but the full life cycle is still under investigation (zoonotic CL). For many years L. tropica was either confused or merely grouped with L. major while Phlebotomus sergenti was the only proven vector. In recent years new foci have erupted, but few have been investigated. This review describes some of the history, recent findings, epidemiology, potential vectors, and the search for possible reservoir hosts besides man.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. ln vitro cultivation of the human microsporidium Vittaforma corneae: development and effect of albendazole

Creator:
Silvera, H. and Canning, E. U.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Vittaforma comeae, life cycle, culture, antimicrosporidial drugs, and ultrastructure abnormalities
Language:
English
Description:
When in vitro growth of Vittaforma comeae was tested using MDCK, MRC-5, XEN, L-929 and FHM cell lines, propagation occurred only in MDCK, MRC-5 and XEN cells. The intervals required for the various stages of the life cycle to develop were the same in all the cell lines tested. The MDCK cell line was selected to support the growth of V. comeae in vitro and provide the system for in vitro testing of drugs. The weekly output of V. comeae spores from the MDCK cell monolayer was monitored over a 61-week period during which there were fluctuations but no definite increase or decrease in output. Albendazole at 2.1 or 4.2 pg/ml in MEM was tested against V. comeae in MDCK cell monolayers and showed antimicrosporidial activity. The percentage of infected cells was reduced in the presence of the drug and there were ultrastmctural abnormalities in all stages of the life cycle. The drug prevents parasite division.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public