Alpha-terthienyl (alpha-T) in the presence of UV-A irradiation reduced the growth rate of Microsporum cookei. In the dark, alpha-T accumulated in small diffuse vacuoles within the hyphae. After UV-A treatment, alpha-T caused damage to the membranes of the nucleus, mitochondria and endoplasmic reticulum. Plasmolytic and autolytic changes occurred resulting in plasma membrane breakage and cell wall aberrations. UV-A activated alpha-T would appear to target membrane proteins.
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Mares et al. (1990) studied this question.
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