Effect of Halogen lons upon the Growth Rate of Bacteria and on the Decomposition of Fish Muscle

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Various authors have reported that Cl' has very weak toxic action and in general its effect is negligible. Inhibitory action of NaCI in higher concentration is known to be due to the osmotic pressure. F' is the moat active among the halogen ions, as repeatedly shown by many investigators. According to E_FFRONT⁽¹⁾, F' in hydrofluoric acid must be potent, as this acid is 10-20 times as inhibitory as hydrochloric ac??d. M_EYERHOF⁽²⁾ ha ?? studied the effect of halogen ions on the respiration of nitrifying bacteria and found that 0.05N NaF reduced the respiration by 30% and O.1N by 65%, O.1N NaBr reduced by 27% and 0.2N by 56%, 0.05N NaJ reduced by 44% and 0.1N by 57%. I_SCHIKAWA⁽³⁾ found that iodides even in low concentrations tend to inhibit ammonia formation by proteolytic as well as urea bacteria; no stimulation was evidenced. According to B_OAS⁽⁴⁾ NaJ or KJ in higher concentration than about 0.3M inhibits the growth of bacteria, but not the growth of molds. He found also that NaJ in concentration of 0.033M-0.003M stimulate the growth of yeast, but with the same compound of a concentration of 0.000008M the growth is worse than the control.
In the present experiment, I have studied the effect of halogen ions on the bacterial decomposition of fish muscle and on the growth rate of bacteria.