title: Changes in morphology of Paecilomyces japonica and their effect on broth rheology during production of exo-biopolymers.
abstract: The influence of Paecilomyces japonica pellet morphology on fermentation broth rheology and exobiopolymer production was investigated in a 5-1 jar fermenter. Rapid formation of pellets was observed after the first day of fermentation; and these slowly increased in size and roughness. This, together with the increase in biomass concentration, altered the transport characteristics and broth rheology towards a pseudoplastic nature which, in turn, influenced cell growth and exo-biopolymer production. At mild agitation, high aeration and optimum substrate concentration, pellets were the most predominant morphological form, compared with free mycelia. The broth rheology showed pseudoplastic behavior; and the fungal morphology was closely related to the rheological properties.
authors.affiliation: Department of Biotechnology, Taegu University, Kyungbuk, Korea.
authors.forename: J
authors.initials: J
authors.lastname: Sinha
authors.forename: J T
authors.initials: JT
authors.lastname: Bae
authors.forename: J P
authors.initials: JP
authors.lastname: Park
authors.forename: K H
authors.initials: KH
authors.lastname: Kim
authors.forename: C H
authors.initials: CH
authors.lastname: Song
authors.forename: J W
authors.initials: JW
authors.lastname: Yun
mesh_terms: D001704:Biopolymers / Q000378:metabolism*; D019149:Bioreactors; D002455:Cell Division; D005285:Fermentation; D010143:Paecilomyces / Q000166:cytology* / Q000378:metabolism; D014783:Viscosity
chemical_list: D001704:Biopolymers