Sagebrush Control: At What Canopy Cover Is It Economically Justified?

The concern for developmental neurotoxicology: is it justified and what is being done about it?

In general, it is believed that the possibility of an adverse developmental outcome following conception is relatively high. In most cases, the cause of the defect is not clear, although exposure to chemical agents at a critical period during development has been proposed to play a significant role. Consequently, regulatory agencies such as the U.S. Environmental Protection Agency (U.S. EPA) ha...

health communication what it is and what is not

Hyperspectral remote sensing of sagebrush canopy nitrogen

Plant canopy nitrogen (N) is associated with ecosystem processes such as photosynthetic and aboveground net primary production, particularly in forested ecosystems. Sagebrush N is directly relatable to wildlife nutritional status and contributes to assessments of habitat quality, productivity, plant / soil water dynamics and controls on canopy photosynthesis. Hyperspectral remote sensing studie...

Remote sensing of sagebrush canopy nitrogen

Eradication in the Americas Economically Justified ?

Since the eradication of smallpox in the 197Os, no other disease has been eliminated from the world by vaccination. Advances in mass immunization campaigns using oral vaccine have successfully interrupted the transmission of wild poliomyelitis virus in many countries, however, and have sharply reduced its incidence in many others (1, 2). The benefits of polio immunization appear from some studi...