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It was found that phosphorylated cotton cellulose made by the phosphoric acid-urea method has a high cation-exchange capacity and when used in the form of a coarse fabric it shows good now characteristics in the calcium-hydrogen cycle. Its cation-exchange capacity increases with increasing phosphorus content and at a phosphorus content of about 5 percent the cation- exchange capacity reaches about 1,000 milliequivalents per kilogram. It is possible that specialized uses may be found for phosphorylated cotton cellulose, especially in the fabric form.

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A collaborative study was conducted to compare a new enrichment procedure for the TECRA® Salmonella Visual Immunoassay (TSVIA) with the reference method given in the U.S. Food and Drug Administration's Bacteriological Analytical Manual (7th Ed.). Three food types (milk powder, pepper, and soy flour) were analyzed in Australia and 3 food types (milk chocolate, dried egg, and raw turkey) were analyzed in the United States. Thirty-eight collaborators participated in the study. The TECRA method was evaluated using both Rappaport-Vassiliadis R10 (RV(R10)) and tetrathionate (TT) broths for selective enrichment. M broth cultures arising from each of the 2 selective enrichment broths were tested in the TSVIA using 2 individual wells, one for each selective broth, and a single well to test the pooled selective enrichment broths. The results for the pooled enrichment broths were reported elsewhere. This study presents the results for the use of single enrichment broths, i.e., RV(R10) only or TT only, with the TSVIA. No significant differences (p > 0.05) were observed for the pairwise comparison of the proportion of positive samples for either RV(R10) or TT used as a single enrichment broth for the TSVIA with that for the reference method.

In the course of investigations involving the determination of the effects of gamma radiation on cotton cellulose [ 1, 3, 4 J and on polymerization of vinyl monomers [ 2 J , a technique for the application, or possibly grafting, of large, controlled quantities of polyacrylonitrile onto cotton has been developed. Acrylonitrile monomer was uniformly applied to purified 7/'3s yarn, Deltapine cotton, and then polymerized by gamma radiation from cobalt-60. The yarns were extracted overnight by N,N-dimethyl formamide at 25° C. to remove any monomer and soluble or loosely bound polymer. Raw yarns were also similarly treated to determine the effects of radiation polymerization of monomer onto raw cotton.As shown in Table I, by use of aqueous ZnCI2 as the solvent relatively large quantities of acrylonitrile monomer could be applied to the raw yarns and radiation polymerized onto the raw cotton. . -_