Low-dose oral immunization with lyophilized tissue of herbicide-resistant lettuce expressing hepatitis B surface antigen for prototype plant-derived vaccine tablet formulation.

Efficient immunization against hepatitis B virus (HBV) and other pathogens with plant-based oral vaccines requires appropriate plant expressors and the optimization of vaccine compositions and administration protocols. Previous immunization studies were mainly based on a combination of the injection of a small surface antigen of HBV (S-HBsAg) and the feeding with raw tissue containing the antigen, supplemented with an adjuvant, and coming from plants conferring resistance to kanamycin. The objective of this study was to develop a prototype oral vaccine formula suitable for human immunization.

A search for radioprotective agents. Part XXXIX. Synthesis of some sulfenamides.

4-(2'-, 4'-nitro- and 2',4'-dinitrobenzenesulfenamido)-quinaldines (I--III) as well as 2-(2'-,3'-nitro and 2',4'-dinitrobenzensulfenamido)-46-oimethylpyrimidines (IV--VI) were obtained. These compounds show a very weak radioprotective activity.