A Constant-Rate Dropping Device for Liquids

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Abstract
Virus in untreated juice of diseased Turkish tobacco plants and purified virus prepared from this juice were subjected to high frequency sound radiation of great intensity at atmospheric pressure and under a high vacuum. The results indicate that inactiva-tion of virus by supersonic radiation is associated with cavitation of dissolved gas and with the presence of extraneous matter found in untreated juice, since high frequency sound waves were found to have practically no effect on purified virus under a high vacuum. The results also indicate that reactivation of virus which has been inactivated by supersonic radiation at atmospheric pressure does not occur and that materials toxic to virus or to test plant are not produced during the irradiation.

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