Dear Editor: The recent report on the“Risk assessment on the epidemics of human infection with a novel avian in- fluenza A (H7N9) virus”is very interesting [1
Dental caries remains one of the most common global chronic diseases caused by Streptococcus mutans,which is prevalent all over the world.The caries prevalence
Because of the different conductivities between the primary phase (low electric conduc tivity) and the metal melt, electromagnetic force scarcely acts on the pr