Cxxxi. the Bacterial Decomposition of Formic
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چکیده
THE bacterial decomposition of formic acid is a subject which, in spite of its apparent simplicity, still presents unsolved problems; it was in the hope of elucidating some of these that the present study was undertaken. The earliest observation on the subject was made by Hoppe-Seyler [1875]. Later Pakes and Jollyman [1901] studied the anaerobic decomposition ow formates by bacteria in a state of active multiplication in meat broth. They collected the mixture of gases formed day by day and analysed it, and, after estimating the carbon dioxide left in the medium, found that the ratio of hydrogen to carbon dioxide was exactly unity, indicating the simple reaction H.COOH = H2 + C02. They did not estimate the amount of formic acid that disappeared, but state that, beginning with 0x2 % to 2-0 % formic acid, roughly 25-30 % was decomposed. From among upwards of thirty species of bacteria used, all those producing gas from glucose also decomposed formic acid anaerobically, and all those producing no gas failed to decompose formic acid. Pakes and Jollyman did not show, however, whether failure to effect this anaerobic decomposition of formic acid involves also an inability to bring about an aerobic breakdown to carbon dioxide and water.
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تاریخ انتشار 2005