โ Scribed by Elise R Sullivan
No coin nor oath required. For personal study only.
Biosurfactants are surface-active microbial products that have numerous industrial applications. The molecular genetics of two structurally diverse biosurfactants, a glycolipid and a lipopeptide, were the first to be characterized. Recent advances include the identification of the structural genes for a second lipopeptide, and the isolation of a gene responsible for enhanced emulsification activity of a high molecular weight biopolymer. New insight has also developed in the regulatory mechanisms of the originally described biosurfactants, both of which are controlled by quorum sensing, a mechanism bacteria use to monitor cell density.
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Cladosporium resinae produces extracellular biosurfactants when growing in a hydrocarbon source such as the jet fuel Jp8. This production of biosurfactants was observed by the reduction of the surface tension of the aqueous phase of growing medium, and by the increase in emulsion and foaming propert
## Abstract A glucoseโlimited chemostat was used to determine the growth parameters of BBK006 for continuous production of the biosurfactant surfactin. The continuous cultivation exhibited low maintenance metabolism (__m__ = 0.39 mmol~glucose~ g~bacteria~^โ1^ h^โ1^) and high molar growth yield ($Y\
## Abstract Methods of producing the biosurfactant surfactin from cultures of __Bacillus subtilis__ (BBK006) have been investigated. A reactor with integrated foam fractionation was designed and used in batch mode, and the performance compared with that of the same culture in shaken flasks. In the