Studies on the influence of mannitol and dulcitol and certain of their anhydrides on the dissociation of boric acid were reported in a previous communication (7). In general, the increased dissociation of boric acid produced by sugar alcohols was exhibited to a lesser degree or not at all by their anhydrides. Another series of these substances has been made available for study, and further investigations as to the effect of these compounds on the dissociation of boric acid have been instituted.
MATERIALSThe-inositol, erythritol, pentaerythritol, and adonitol employed were Pfanstiehl's c.p. products and met the specifications of their catalogue.Ethylene glycol, ethylene oxide, propylene glycol, propylene oxide, and trimethylene glycol were supplied by the Eastman Kodak Co. The dihydroxyacetone employed was Oxantin, prepared formerly by Merck and Co. The epihydrin alcohol was prepared from epibromhydrin (1). The Z-epihydrin alcohol, distilling at 70°C. at 10 mm. pressure, was employed. The polygalitol was extracted from poly gala amara (9). The compound melted at 138°C. (uncorrected). The erythritan was prepared from erythritol by dehydration with sulfuric acid (2,6). Analysis gave the
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Das kathodische Verhalten von 85‐100%iger Schwefelsäure in Abhängigkeit von Kathodenmaterial, von der Temperatur und von der Wasserkonzentration wird untersucht.
In a former communication the authors (1935) presented studies on acid and gas formation by members of the colonaerogenes-intermediate groups in the presence of sugar alcohols and their anhydrides. In general it was observed that mannitol and dulcitol are fermented by many organisms of this group, but that their anhydrides are not utilized as determined by ordinary fermentation tests. So striking was the resistance to utilization of the anhydrides in contrast to the ease of metabolism of the sugar alcohols themselves that the study was extended in order further to elucidate the relationship between chemical constitution and fate in the bacterial economy.
CHEMICAL CONSTIT ONThe following formulas show the structural relationships of the substances employed. H
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