Fine Structure of Vegetative Hyphae of Aspergillus fumigatus

Campbell, Colin

doi:10.1099/00221287-64-3-373

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…The electron-dense layer formed after germination on the outer surface of the hypha seems to be of similar nature. An analogous layer has been found in permanganate fixed hyphae of Aspergillus fiiinigat~is (Campbell 1970). Other authors suggest that the outermost layer of the hyphae is made of glucan (Hunsley and Burnett 1970;Jones 1970;Bartnicki-Garcia 1968).…”

Section: Discussionmentioning

confidence: 99%

“…Vacuoles found in P. notatunz are similar to those found by Garcia-Acha et al (1966) and by Lowry and Sussman (1968). By analogy with other fungi the electron-transparent granules that we have found are storage bodies composed either of polysaccharides (Campbell 1968;Campbell 1970) or lipids (Matile et al 1969). Some of them become concentrated at the hyphal tip suggesting that they may be encased in the wall as it forms (Hemmes and Hohl 1969;McClure et al 1968).…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructural changes in the conidia of Penicillium notatum during germination

Martı́n¹,

Uruburu²,

Villanueva³

1973

Can. J. Microbiol.

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1973. Ultrastructural changes in the conidia of Penicilliurn notarllrn during germination. Can. J. Microbiol. 19: 797-801.To study the changes in the cell wall of Penicilliurn notaturn during germination, thin sections of resting, swollen, and germinating spores, and mycelium were compared with thin sections of the isolated cell walls. In the cell wall of resting spores four distinct layers were found. The outermost layer of the cell wall of resting spores was released during swelling and the two inner layers were extended to form the cell wall of the germ tube. The cell wall of young germ tubes had only two layers but a new electrondense layer was formed later on the outside. Mycelial cell walls which appeared thinner than those of conidia showed three distinct layers. Large mitochondria that divide during germination were present in both resting and swollen spores. Two different types of vacuoles were found, both of which decreased in size and in number during germination. Endoplasmic reticulum was almost absent in resting spores but increased substantially during swelling. MARTIN, J. F., F. URUBURU et J. R. VILLANUEVA. 1973. Ultrastructural changes in the conidia of Perricilliurn notatum during germination. Can. J. Microbiol. 19: 797-801. Pour ttudier les changements dans la paroi cellulaire de Penicillirlrn trotaturn au cours de la germination, nous avons cornpart des sections minces de spores au repos, en renflement et en germination, et de myctlium, avec des sections minces de parois cellulaires isoltes. Dans la paroi cellulaire des spores au repos, nous trouvons quatre couches distinctes; la couche la plus exttrieure est libtrte au cours du renflement, et les deux couches internes sont etendues pour former la paroi cellulaire du tube germinatif. La paroi cellulaire des jeunes tubes germinatifs a seulement deux couches, mais une nouvelle couche dense aux tlectrons est formte plus tard vers l'exttrieur. Les parois cellulaires du myctlium, lesquelles apparaissent plus minces que celles des conidies, montrent trois couches distinctes. Des grosses mitochondries, qui se divisent au cours de la germination, sont prtsentes dans les spores au repos, aussi bien que dans celles en renflement. Nous trouvons deux difftrents types de vacuoles, les deux dtcroissent en grosseur et en nornbre au cours de la germination. Le r6ticulum endoplasmique est presqu'absent dans les spores au repos, mais accroit substantiellement au cours du renflement.[Traduit par le journal]

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Ultrastructural changes in the conidia of Penicillium notatum during germination

Martı́n¹,

Uruburu²,

Villanueva³

1973

Can. J. Microbiol.

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“…Two ultrastructural studies of A. fumigatus found no evidence for multiple layers in the cell wall per se, though flocculent electron-dense material covering the outer wall was noted (41,197). One of the reports, however, stated that the conidia had two wall layers (197).…”

Section: Filamentous Fungimentioning

confidence: 99%

Compounds active against cell walls of medically important fungi

Hector

1993

Clin Microbiol Rev

215

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A number of substances that directly or indirectly affect the cell walls of fungi have been identified. Those that actively interfere with the synthesis or degradation of polysaccharide components share the property of being produced by soil microbes as secondary metabolites. Compounds specifically interfering with chitin or beta-glucan synthesis have proven effective in studies of preclinical models of mycoses, though they appear to have a restricted spectrum of coverage. Semisynthetic derivatives of some of the natural products have offered improvements in activity, toxicology, or pharmacokinetic behavior. Compounds which act on the cell wall indirectly or by a secondary mechanism of action, such as the azoles, act against diverse fungi but are usually fungistatic in nature. Overall, these compounds are attractive candidates for further development.

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Two common fungi associated with farmer's lung: Fine structure of Aspergillus fumigatus and Aspergillus umbrosus

Reijula

1991

Mycopathologia

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The fine structure of Aspergillus fumigatus and Aspergillus umbrosus by transmission electron microscopy (TEM) is described. The fine structure of the ascosporic and asexual stages of A. umbrosus is described for the first time. Dense, homogenous material and fibers were detected on the outer hyphal cell wall of the Aspergilli. Septal pores were found in the hypha of A. umbrosus. Two wall layers were detected in the cell wall of the conidia of the both Aspergilli. The ascospores of A. umbrosus contained thick cell wall and the surface of which was smoother than that of the conidia.

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Fine Structure of Vegetative Hyphae of Aspergillus fumigatus

Cited by 12 publications

References 7 publications

Ultrastructural changes in the conidia of Penicillium notatum during germination

Ultrastructural changes in the conidia of Penicillium notatum during germination

Compounds active against cell walls of medically important fungi

Two common fungi associated with farmer's lung: Fine structure of Aspergillus fumigatus and Aspergillus umbrosus

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