title: Extremely low frequency magnetic field effects on metabolite of Aspergillus niger.
abstract: The effect of the extremely low frequency (ELF) magnetic field on citric acid and cellulase production by Aspergillus niger using liquid Charles culture medium was studied during shake flask culture. The cellular suspension was exposed to a magnetic field (t = 4 h, B = 1 mT, and f = 50 Hz). The dependence of yield of citric acid and activity of cellulase on time of exposure and on the value of the magnetic field induction B was measured. Both yield of citric acid and activity of cellulase increased with increasing exposure time and/or induction B, but the quantity of the effect was dependent on the chemical structure of metabolites. The metabolism of citric acid was more sensitive to the magnetic field than that of cellulase. From the measurement of the metabolism dynamics we concluded that the increase in the citric acid and activity of cellulase started immediately after the magnetic field was switched on.
authors.affiliation: Yangtze University, Jingzhou, Hubei, China. mxgao0398@163.com
authors.forename: Mengxiang
authors.initials: M
authors.lastname: Gao
authors.forename: Jialan
authors.initials: J
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Feng
mesh_terms: D001234:Aspergillus niger / Q000201:enzymology / Q000378:metabolism* / Q000528:radiation effects*; D002480:Cellulase / Q000378:metabolism; D019343:Citric Acid / Q000378:metabolism; D004307:Dose-Response Relationship, Radiation; D004574:Electromagnetic Fields / Q000009:adverse effects*; D005285:Fermentation / Q000528:radiation effects; D013997:Time Factors
chemical_list: D019343:Citric Acid; D002480:Cellulase