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W R Hansen

Publications and source records attributed to W R Hansen.

2 recordsLinked to original sources

Effects from past solid waste disposal practices.

This paper reviews documented environmental effects experience from the disposal of solid waste materials in the U.S. Selected case histories are discussed that illustrate waste migration and its actual or potential effects on human or environmental health. Principal conclusions resulting from this review were: solid waste materials do migrate beyond the geometric confines of the initial placement location; environmental effects have been experienced from disposal of municipal, agricultural, and toxic chemical wastes; and utilization of presently known science and engineering principles in sitting and operating solid waste disposal facilities would make a significant improvement in the containment capability of shallow land disposal facilities.

Environmental Pollution

Infection rates of Aedes triseriatus following ingestion of La Crosse virus by the larvae.

Infection rates ranged from 0-2.1% in adults of Aedes triseriaus reared from groups of larvae that had ingested La Crosse (LAC) virus (Clifornia encephalitis group) at dosages of 7.0-8.3 log 10 SMICLD50/ml. Females form orally infected larvae transmitted the virus to suckling mice. Larvae that devoured carcasses of transovarially infected larvae containing 3.0 log 10 SMICLD 50/ml failed to become infected. Ingestion by larvae of infected carcasses appears, therefore, to be unimportant as a method of horizontal amplification of LAC virus.

Aedes