title: Effect of Ultraviolet-A (UV-A) and Ultraviolet-C (UV-C) Light on Mechanical Properties of Oyster Mushrooms during Growth.
abstract: This study investigated the effects of ultraviolet-A (UV-A) and ultraviolet-C (UV-C) light on the mechanical properties in oyster mushrooms during the growth. Experiments were carried out with irradiation of the mushrooms with UV-A (365 nm) and UV-C (254 nm) light during growth. The exposure time ranged from 10 minutes to 60 minutes at intervals of 10 minutes and irradiation was done for three days. The samples for experimental studies were cut into cylindrical shapes of diameter 12.50 mm and thickness 3.00 mm. The storage modulus, loss modulus, and loss factor of the irradiated samples and control samples were determined for both UV bands and there was a significant difference between the storage modulus, loss modulus, and loss factor of the irradiated samples by both UV bands with reference to the control sample, P < 0.05. UV-C light irradiated samples had higher loss modulus and loss factor but low storage modulus as temperature increased from 35 to 100°C with respect to the control sample while UV-A light irradiated samples had lower loss modulus, low loss factor, and higher storage modulus than UV-C irradiated samples.
authors.affiliation: Department of Physics, Egerton University, Egerton 20115, Kenya.
authors.forename: Tindibale L
authors.initials: TL
authors.lastname: Edward
authors.affiliation: Department of Physics, Egerton University, Egerton 20115, Kenya.
authors.forename: M S K
authors.initials: MS
authors.lastname: Kirui
authors.affiliation: Department of Chemistry, Egerton University, Egerton 20115, Kenya.
authors.forename: Josiah O
authors.initials: JO
authors.lastname: Omolo
authors.affiliation: Department of Physics, Egerton University, Egerton 20115, Kenya.
authors.forename: Richard G
authors.initials: RG
authors.lastname: Ngumbu
authors.affiliation: Department of Physics, Egerton University, Egerton 20115, Kenya.
authors.forename: Peter M
authors.initials: PM
authors.lastname: Odhiambo