The need for healthy food is much stringent than before. Food packaging is an important part in the production of food. The migration of silver nanopartilcles in nanosilver packages should be detected carefully. In this paper, the migration of silver nanoparticles in nano-silver/polypropylene milk storage packages was studied by UV-vis, which could be available in the evaluation of food packages.

Facing the current situation of organic chemistry courses in colleges and universities, such as too much content, insufficient class hours, insufficient students’ absorption and inadequate practice, this paper effectively introduces the combination of online and offline teaching mode in the teaching process of organic chemistry. This teaching mode is diversified and has strong advantages. It gives full play to the leading role of teachers in guiding, inspiring and supervising in the teaching process, stimulates students’ interest in learning, promotes teachers’ teaching reform ability, and achieves good teaching effect.

Peste des Petits Ruminants (PPR) is one of the most economically important, highly contagious, fatal transboundary viral diseases of small ruminants affecting primarily the sheep and goats and caused by PPR virus (PPRV), a member in Morbillivirus genus of family Paramyxoviridae. As we know that prophylaxis using live attenuated vaccines is the primary choice of control measure as the immunity is long lasting. In this study, we evaluated safety, immunogenicity and potency of a live attenuated PPR vaccine manufactured by Brilliant Bio Pharma Private Limited in a freeze-dried form containing vaccine virus titer of 103.5 CCID50/dose. The vaccine safety was tested in goats using 100 times the recommended field dose. In the safety trial, none of the vaccinated animals showed any deviation from physiological norms or fever. In the immunogenicity study, all the sheep and goats vaccinated by subcutaneous route developed virus-neutralizing antibody titer in the range of 1:8 to 1:128 at 21 days post-vaccination (dpv). While, in the potency study, all the vaccinated animals resisted challenge with virulent PPR virus on 21 dpv and demonstrated full protection, while unvaccinated control sheep and goats showed characteristic clinical signs of PPR disease. Overall, the live attenuated PPR vaccine was found to be safe, immunogenic and potent as evident from safety, sero-conversion as well as challenge studies in sheep and goats.