|
Aspergillus niger The U.S. Government's Occupational Safety and Health Administration [OSHA] lists Aspergillus niger as an allergen and an irritant and a cause of Hypersensitivity Pneumonitis and Dermatitis.
Aspergillus niger is a causative agent of Aspergilloma, Aspergillosis, and Otomycosis. ( Information from www.doctorfungus.org @ 2005)
|
|||
|
Aspergillus niger Mold Pictures
A microscopic photograph of radiate conidial head Aspergillus niger viewed under 40X objective.
A microscopic photograph of the brown - colored and round - shaped conidia of Aspergillus niger viewed under 100X objective. The enlarged microscopic Aspergillus niger photographs shown above were taken by our Mold Microbiologist, Ma. Adee Light E. Hilado for mold species documentation.
For more Aspergillus mold pictures, please visit: Aspergillus mold pictures and Aspergillus niger pictures.
|
|||
|
Ecology Aspergillus niger is a cosmopolitan fungus which is primarily isolated from soil and decomposing plant material.
Pathogenicity and Health Effects Aspergillus niger is a frequent causative agent of aspergilloma. It rarely causes primary cutaneous, pulmonary, and disseminated infection, particularly among immunocompromised patients. Aspergillus niger is isolated often in cases of chronic otitis where, generally, from the outer ear canal colonizations.
Macroscopic Appearance
Ø Growth rate is rapid and texture of colonies varies from downy to powdery, and may produce radial fissures in the agar; and Ø Surface colony color is initially white becoming black to deep brown with conidial production while the reverse is pale yellow or uncolored.
Microscopic Appearance
Ø Hyphae are septate and hyaline and conidial heads are initially radiate, however, splitting into columns in age; Ø Aspergillus niger is biseriate wherein its vesicles form sterile cells called as metulae that support the conidiogenous phialides; Ø Conidiophores are hyaline, smooth – walled, with length ranging from 400 – 3, 000 µm long, and are becoming darker at the apex and terminating in a globose vesicle with size of 30 – 75 µm in diameter; and Ø Metulae and phialides cover the entire surface of the vesicle; Ø Conidia are globose, brown - to black – colored, very rough, and with size of 4 – 5 µm in diameter.
|
|||
|
The mycological information http://www.doctorfungus.org http://www.mycology.adelaide.edu.au http://www.mycology.net http://www.clinical-mycology.com http://www.botany.utoronto.ca http://www.med.sc.edu http://www.tigr.org http://www.pangloss.ucsfmedicalcenter.org http://www.dermnz.org http://www.wadsworth.org http://botit.botany.wisc.edu
A Clinical Laboratory Handbook: Identifying Filamentous Fungi by St.
Germain, Guy and R. Summerbell. |
|
||
|
|
|||
