The incorporation of NaCl into freeze-dried carrot-slices was found to have a marked effect on rehydration. Highest rehydration ratios were obtained at the 0.2M NaCl treatment. After 5 min of rehydration, the 0.2M NaCl treatment resulted in a 54% increase in rehydration ratio over nontreated control samples. Microstructure of the freeze-dried C;IIrot tissue was characterized utilizing the scanning electron microscope. Location of crystalline and amorphous salt deposition was observed and related to rehydration characteristics.
Filament formation in radioresistant mutants of Escherichia coli S after treatment with ultraviolet light and radiomimetic agents. J. Bacteriol. 83:38-42. 1962.-The effect of ultraviolet light and of five radiomimetic compounds on cell division, growth in liquid medium, and growth in solid medium of Escherichia coli S and four of its radioresistant mutants was examined. All of the
The inhibition of lactic acid bacteria by quaternary ammonium compounds in milk has been shown to be an effect on acid production and not upon growth. Lactic acid production is affected by concentrations of 2.5 – 10 ppm, while growth is not affected unless the concentration is 25 – 50 ppm.
CURRY, JANET C. (Lever Brothers Research Center, Edgewater, N.J.). Gradient plate bioassay for tyrothricin and its application to dentifrices. Appl. Microbiol. 11:539-541. 1963.-A bioassay for tyrothricin, based on a procedure used by Szybalski in bacterial resistance studies, was developed. Replacement of the tube dilution assay with this procedure represented economy in time and equipment, with a resultant increase in productivity. The
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