Modifications of Culture Media Used in the Isolation
نویسنده
چکیده
I t was observed that the Endo medium, as ordinarily prepared, with a phenolphthalein reaction of + 0.2, gave variable results with the dysentery group of bacilli, the Shiga type of Bacillus dysenterice being either markedly inhibited in its growth or failing to grow at all. This restraining effect was found to be due to the end-reaction, which, after the addition of the sulfite, reached a hydrogen concentration ranging from pH 8.6 to 8.8, a degree of alkalinity unfavorable to the development of the Shiga bacillus. By adjustment of the reaction of the medium to pH 7.8-8.0, the inhibiting effect is greatly reduced, and the plates are suitable for the isolation of all the pathogenic members of the typhoid-dysentery class of bacilli. The agar is prepared in the usual manner, titrated to pH 7.4, flasked in 100 cc. or other suitable amounts, and sterilized? Before the
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تاریخ انتشار 2003