The effect of UV-light on pityrosporum yeasts: ultrastructural changes and inhibition of growth.

摘要: The effect of UV-light on Pityrosporum yeasts (P.) was studied: P. cultured from the skin were spread Dixon plates and irradiated with different UVB-and UVA-light dosages read after three days, controls not irradiated. Also yeasts, immediately irradiation, isolated studied an electron microscope. A significant growth inhibition or no at all seen 25, 50, 75 J/cm2 UVA 900 mJ/cm2 UVB, a moderate irradiation 250 UVB. paralleled by ultrastructural degenerative alterations: clumping ribosomes lysis nuclei. amount "stacked material" in vacuoles diminished they completely empty, cell wall remained unchanged. Our results imply that positive sunlight seborrhoeic dermatitis may well be explained direct influence yeasts.