The Japanese word for Japan is æ¥æ¬, which is pronounced Nippon or Nihon and literally means the origin of the sun. The earliest record of the name Nihon appears in the Chinese historical records of the Tang dynasty, the Old Book of Tang.
Primary versus Secondary Immune Response The primary immune response occurs the first time that the immune system comes in contact with the antigen.
Key Difference â Primary vs Secondary Cell Culture. Before discussing the difference between Primary and Secondary Cell Culture, let us first briefly define what cell culture is. Cell culture is the process of removing cells from an animal or plant and subsequent growth in an artificially controlled environment.