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Phylum Ascomycota, a major division within the subkingdom Dikarya, comprises a diverse range of fungal species, including both unicellular yeasts and filamentous molds such as Aspergillus and Penicillium. These fungi thrive in a variety of habitats, from aquatic ecosystems to terrestrial environments, playing crucial ecological and economic roles.Morphology and ReproductionThe defining characteristic of Ascomycetes, commonly referred to as sac fungi, is the ascus—a sac-like structure that...
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Isolation of Culturable Yeasts and Molds from Soils to Investigate Fungal Population Structure
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Published on: May 27, 2022

THE EFFECTS OF ULTRAVIOLET RADIATION ON SPORES OF THE FUNGUS ASPERGILLUS NIGER.

P A Zahl1, L R Koller, C P Haskins

  • 1Haskins Laboratory, Union College, and the Research Laboratory of the General Electric Company, Schenectady.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Ultraviolet radiation inactivates Aspergillus spores, with survival depending on energy dose. Humidity had no effect, but irradiation caused germination delays and morphological changes.

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Histological Quantification to Determine Lung Fungal Burden in Experimental Aspergillosis
09:52

Histological Quantification to Determine Lung Fungal Burden in Experimental Aspergillosis

Published on: March 9, 2018

Area of Science:

  • Microbiology
  • Photobiology
  • Radiation Biology

Background:

  • Aspergillus spores are common airborne fungi.
  • Understanding their inactivation by ultraviolet (UV) radiation is crucial for sterilization and public health.
  • Previous studies have explored UV effects on microorganisms, but specific data on Aspergillus spore inactivation kinetics and associated phenomena are needed.

Purpose of the Study:

  • To quantify the survival ratio of Aspergillus spores exposed to UV radiation.
  • To investigate the influence of different UV wavelengths and incident energy on spore inactivation.
  • To examine the effects of humidity, germination delay, and morphological changes post-irradiation.

Main Methods:

  • Exposure of Aspergillus spores to UV radiation at wavelengths of 2537 A, 3022 A, 3129 A, and 3650 A.
  • Measurement of spore survival ratio as a function of total incident energy.
  • Assessment of humidity's effect on spore inactivation.
  • Observation of germination patterns and morphological alterations.

Main Results:

  • The survival ratio of Aspergillus spores decreased with increasing incident UV energy.
  • Humidity was found to have a negligible impact on UV-induced spore killing.
  • A significant delay in spore germination was observed after UV exposure.
  • The Bunsen-Roscoe reciprocity law was validated for the tested radiation intensities.
  • Observable morphological changes occurred in the irradiated spores.

Conclusions:

  • Aspergillus spore inactivation by UV radiation is dose-dependent and wavelength-influenced.
  • UV radiation poses a viable method for Aspergillus spore control, independent of humidity.
  • Irradiation induces sublethal damage, manifesting as delayed germination and altered morphology.
  • The findings support the application of UV disinfection protocols for Aspergillus contamination control.