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Nisin production by Lactococcus lactis subsp. lactis C2SmPrt-(TnNip) was investigated using two-phase batch culture. A solvent (phenyl-methyl silicone oil) was introduced in addition to the aqueous phase. The partition coefficient of this solvent in aqueous nisin varied as the cultivation medium changed, with a minimum value being 1.04. The two-phase batch(More)
A laboratory procedure is described that has been used in determining the breakdown products of plastic compounds used in injection molding operations. These compounds include polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene, methyl methacrylate, polyethylene, polypropylene, and nylon. Laboratory samples were generated at injection molding(More)
Carbon black is one of the most useful particulate materials in the industrial field. Among the various physical properties of carbon black, size and size distribution are the most important properties to affect the quality of a final product. However, it is difficult to measure the exact particle size of carbon black since it suffers unavoidable(More)
A method for sampling and analysis of atmospheres for sulfur dioxide is presented. This method is based on adsorption of sulfur dioxide on an impregnated charcoal sorbent followed by desorption and analysis by ion chromatography. The precision and recovery of the sampling and analytical method were determined at 2, 1, 0.5 and 0.1 times the present OSHA(More)
A new method for the collection and analysis of atmospheric formaldehyde is described. Known concentrations of formaldehyde were generated and collected on solid sorbent tubes containing impregnated charcoal which converted formaldehyde to formate. After desorption with dilute hydrogen peroxide, the formate was analyzed by ion chromatography. The sample(More)
We study a disk cathode in the weakly relativistic region less than 100 kV by comparing the conventional tubular cathode. The disk cathode is an explosive electron emission cathode made of bare metal. The beam generated by the disk cathode has the more uniform distribution and has the higher current density compared with the tubular cathode with velvet. For(More)
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