A less-virulent poliovirus generated by altering codon usage suggests a new strategy for vaccine development. Figure 1: Development of an attenuated vaccine by two classical methods and the ...

Natural attenuation is the risk-based management of contaminated land and groundwater using the combined effects of biological, chemical and physical processes, which occur naturally in the subsurface ...

These are discussed separately below. Attenuation from a point source (left) where the intensity decreases according to the square of the distance from the source (note increasing cone area), and from ...

Objectives—Commercially available football head protectors were tested to determine their impact energy attenuation performance and ability to reduce the likelihood of concussion. Methods—Prospective ...