MICROMORPHOLOGY OF
            <i>DERMATOPHILUS CONGOLENSIS</i>

Gordon, Morris; Edwards, Mercedes R.

doi:10.1128/jb.86.5.1101-1115.1963

Cited by 27 publications

(9 citation statements)

References 25 publications

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“…Coccoid bodies with flagella can be recognised and the number of identified bodies was higher, especially with the scanning electron microscope. O u r findings, with only minor differences, are analogous to those which were described previously [7,11,14,15,16,23,261. Dermatophilosis [8,20] is almost invariably an animal skin infection, rarely transmitted to man.…”

Section: 860~supporting

confidence: 87%

Experimental Dermatophilosis

Buček

Pospíśil

Moster

et al. 1992

Journal of Veterinary Medicine, Series B

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The histopathologic features of an experimental dermatophilosis of rabbit skin were described. The strain of Dermatophilus congolensis used for the experimental infection was obtained from the unique isolation and cultivation of this actinomycete from the ulcerous leg lesion of one male patient. Further strains in experiment came from the collections of type cultures. The experimental infection was characterized as an exudative and crustous dermatitis with akanthosis and subcorneal abscesses. Branching hyphae and clusters of coccoid bodies were found mostly in the parakeratotic layer and infrequently in the abscesses. Both the coccoid bodies and the hyphae were Gram-positive. The hyphae were acid-fast hut the coccoid bodies were nonacid-fast. The fine structure of hyphae and coccoid bodies, namely of those with flagella, was also described by means of a transmission and scanning electron microscope.

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Section: 860~supporting

confidence: 87%

Experimental Dermatophilosis

Buček

Pospíśil

Moster

et al. 1992

Journal of Veterinary Medicine, Series B

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“…In the present study, the capsule surrounding free cocci appeared to thicken with maturation, as compared to that on dividing structures. This was contrary to ROBERTS (1961) and GORDON and EDWARDS (1963) who reported that the hyphal capsule thickened during division.…”

Section: Abu-samra and Walton (1977)contrasting

confidence: 82%

“…Although previous studies on the morphology, mode of propagation and life cycle of Dermatophilus congolensis have been made (THOMPSON, 1954;THOMPSON and BISSET, 1957;AUSTWICK, 1958;ROBERTS, 1961;MB-MBRY, 1961;GORDON and EDWARDS, 1963;GORDON, 1964;RICHARD, RITCHIE and PIER, 1967;LUEDEMANN, 1968;GORDON, 1976), some aspects of the morphology of this organism remain to be elucidated.…”

Section: Introductionmentioning

confidence: 99%

“…The morphology of the organism under the transmission electron microscope (TEM) has been reported (GORDON and EDWARDS, 1963;RICHARD et al, 1967;GORDON, 1976). Although ultrathin sectioning of the organism was claimed to be difficult because delicate structures could easily be damaged in preparation (GORDON and EDWARDS, 1963), negative staining of whole motile cells, however, was adequate in demonstrating their locomotor apparatus (RICHARD et al, 1967).…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Ultrastructure and the Life Cycle of Dermatophilus congolensis

Abu-Samra

2010

Zentralblatt Für Veterinärmedizin Reihe B

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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.

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“…Mlicroscopic morphology. For descriptions and illustrations of sequential stages in the life cycle of D. congolensis, recent l)ublications (Roberts, 1961;Dean et al, 1961;and Gordon and Edwards, 1963) should be consulted. The lpresent studies resulted in observations similar to these and revealed no important differences in microscopic morphology among the putative three species.…”

Section: Downloaded Frommentioning

confidence: 99%

THE GENUS DERMATOPHILUS

Gordon

1964

J Bacteriol

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Seventeen strains of Dermatophilus originating in skin lesions of cattle, sheep, horses, deer, and man were compared as to conditions for growth, colonial characteristics under varying conditions, microscopic morphology, and biochemical reactions. All grew well aerobically at 37 C and were facultatively anaerobic. They were morphologically similar in both gross and microscopic appearance, and most produced motile spores. Stable gray variants often appeared among the orange-yellow "wild

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MICROMORPHOLOGY OF DERMATOPHILUS CONGOLENSIS

Cited by 27 publications

References 25 publications

Experimental Dermatophilosis

Experimental Dermatophilosis

A Study of the Ultrastructure and the Life Cycle of Dermatophilus congolensis

THE GENUS DERMATOPHILUS

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