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Scientists who are tempted to study viruses today must be prepared to have a little knowledge of zoology, genetics, biochemistry, biophysics, microbiology, immunology, and, if they choose to become "quantifiers," mathematics. Up to now, they had to study textbooks of the respective disciplines in order to be versatile enough to find their way in virology; however, this book should make their lives easier. Instead of studying books on physics and biophysics, the future virologist will have the pleasure of reading chapter 3, which contains a brief, lucid, and informative account of Schachman and Williams dealing with the physical properties of the infective virus participles. This material should provide him with a sufficient background of physics to enable him to approach his problems in this field in an intelligent manner.
Pursuing further the application of biophysics to the knowledge of viruses, Schwerdt, in chapter 4, describes methods of counting virus particles
The Viruses: Biochemical, Biological, and Biophysical Properties. Volume 1: General Virology. JAMA. 1960;172(12):1339. doi:10.1001/jama.1960.03020120117031