A Study of the Ultrastructure and the Life Cycle of Dermatophilus congolensis
2010; Wiley; Volume: 26; Issue: 2 Linguagem: Inglês
10.1111/j.1439-0450.1979.tb00799.x
ISSN0931-2021
Autores Tópico(s)Allergic Rhinitis and Sensitization
ResumoZentralblatt für Veterinärmedizin Reihe BVolume 26, Issue 2 p. 110-124 A Study of the Ultrastructure and the Life Cycle of Dermatophilus congolensis Dr. Mukhtar Taha Abu-Samra, Corresponding Author Dr. Mukhtar Taha Abu-Samra University of Liverpool, Department of Veterinary Preventive Medicine, Field Station “Leahurst”, Neston, L64 7 TE, Wirral, Merseyside, EnglandP. O. Box 2278, Khartoum/Sudan.Search for more papers by this author Dr. Mukhtar Taha Abu-Samra, Corresponding Author Dr. Mukhtar Taha Abu-Samra University of Liverpool, Department of Veterinary Preventive Medicine, Field Station “Leahurst”, Neston, L64 7 TE, Wirral, Merseyside, EnglandP. O. Box 2278, Khartoum/Sudan.Search for more papers by this author First published: March 1979 https://doi.org/10.1111/j.1439-0450.1979.tb00799.xCitations: 6AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Summary The smooth form of Dermatophilus congolensis was studied in the scanning electron microscope and both rough and smooth forms were studied in the transmission electron microscope. Flagellate zoospores and non-flagellate cocci were found dividing. Cocci undergo a series of developmental and maturation stages before they finally germinate. Hyphae were transformed into cocci in an irregular fashion. In addition, each distended segment of certain hyphae appeared to function as a zoospore. These two observations suggest amendments to the life cycle previously described for D. congolensis. Zusammenfassung Untersuchungen über Ultrastruktur und Entwicklungszyklus von Dermatophilus congolensis R- und S-Form von Dermatophilus congolensis wurden elektronenmikroskopisch untersucht; die S-Form wurde zusätzlich mittels Rasterlektronen-mikroskop untersucht. Als unterschiedlich wurden begeißelte Zoosporen und nicht begeißelte Kokken gefunden. Die Kokken unterliegen einer Reihe von Entwicklungs- und Reifungsstadien bis sie schließlich auskeimen. Die Hyphen wurden auf außergewöhnliche Weise in Kokken umgeformt. Hinzukommt, daß jedes aufgeblähte Segment bestimmter Hyphen scheinbar die Funktion einer Zoospore ausüben kann. Diese zwei Beobachtungen legen Berichtigungen des bislang beschriebenen Entwicklungszyklus von D. congolensis nahe. Résumé Recherches sur l'ultrastructure et le cycle de développement de Dermatophilus congolensis Des forms R et S de Dermatophilus congolensis ont été examinées au microscope électronique; la forme S a été examinée en plus au microscope électronique à réseau. On a trouvé comme différence des zoospores ciliés et des cocci non ciliés. Les cocci étaient susceptibles de passer des stades de développement et de maturation jusqu'à un développement final. Les hyphes furent transformés de manière inhabituelle en cocci. Chaque segment enflé d'hyphes déterminés peut exercer apparemment la fonction d'une zoospore. Ces deux observations confirment à peu près le cycle de développement de D. congolensis décrit jusqu'à maintenant. Resumen Estudios sobre la ultraestructura y el ciclo evolutivo de Dermatophilus congolensis Se examinaron con el microscopio electrónico las formas R y S de Dermatophilus congolensis; la forma S se estudió además mediante el microscopio electrónico de trazados. Come diferencias se hallaron zoosporas flageladas y cocos sin flagelos. Los cocos se hallan sujetos a una serie de estadios evolutivos y de maduración hasta que, por fin, germinan. Las hifas se transformaron, de forma extraordinaria, en cocos. Se suma a esto que cada segmento hendido de ciertas hifas ejerce, al parecer, la función de una zoospora. Estas dos observaciones insinuan correcciones en el ciclo evolutivo de D. congolensis descrito hasta la fecha. References Abu-Samra, Muk. T., 1977: Studies on Dermatophilus congolensis. Ph. D. Thesis, University of Liverpool, England. Google Scholar Abu-Samra, Muk. T., 1978: Morphological, cultural and biochemical characteristics of Dermatophilus congolensis. Zbl. Vet. 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