Circulating monocytes are primed to release more of the cytokines, IL-10 and MIP-1alpha, in dual but not in single responders, at 24 h after allergen. They may contribute to allergen-induced inflammatory responses in the airways.

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TABLE 1 Analysis of Water in Distribution Systemterfere with the colorimetric method for fluorides. The first experiments were made using distilled water, and then the work was repeated with natural water of varying degrees of hardness. Experiments With Distilled WaterProcedure Standard phosphate solutions were made by dissolving definite amounts of sodium hexametaphosphate ((Na-52 avoided by using only clear supernatant (hydrated iron oxides settled to the bottom) . When phosphate concentration was investigated, it was found that the water supply operator was feeding excessive amounts of a polyphosphate compound (Nalco 918Y, distributed by The Flax Co.) into the water supply.Some experiments were made to determine just how much phosphates in-7.3 320 390 1.2 0.05 4.5 5.0 pH Value Total Hardness, ppm. Total Alkalinity, ppm. Total Iron, ppm. Manganese, ppm. Chlorides, ppm. Sulfates, ppm.M O ST of the commonly used methods for the determination of the fluoride content of water supplies are based on the decolorization of a zirconium-alizarin lake in proportion to the fluoride present. It is definitely known that iron, aluminum, sulfates and chlorides interfere with these colorimetric methods, but no specific information has been available in the past about the influence of phosphates.Recent investigations have shown that phosphates do interfere with colorimetric fluoride determinations. This discovery was made when samples of water from a small town were being analyzed. A polyphosphate compound was being used to stabilize a ground water supply, and, when the water in the distribution system was analyzed, 2.3 ppm. of fluoride were found by the Scott modification (1) of the Sanchis method (2), although the raw weIl water contained only 0.2 ppm. fluoride. A sample of water from the distribution system was then distiIled with sulfuric acid (3) and the fluoride content was found to be 0.2 ppm. by the Scott method. A chemical analysis of the water gave the results shown in Table 1. The chloride and sulfate concentrations were too low to interfere with the colorimetric determination. and the interference from iron was