THE nature of ‘virus’ still eludes precise definition. No one knows exactly what it is, and none of the hypotheses covers all the apparent facts without a certain amount of artificial straining.

The data and guidelines presented here will assist those who operate plants with electrostatic precipitators to develop a strategy for filterable particulate emissions control. New Environmental ...

Following the announcement of the initial operational definition of a virus as a filterable agent, attempts were made to identify the properties of viruses that separated them from other ...