Word: ddd
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...text-align: left; } #305 { width: 305px; } .titlerow-a { background-color: #bbb; float: left; width: 175px; } .titlerow-b { background-color: #bbb; float: right; width: 125px; text-align: right; } .row1a { background-color: #fff; float: left; width: 175px; } .row1b { background-color: #fff; float: right; width: 125px; text-align: right; } .row2a { background-color: #ddd; float: left; width: 175px; } .row2b { background-color: #ddd; float: right; width: 125px; text-align: right; } .source { font-size: 11px; text-align: right...
...text-align: left; } #305 { width: 305px; } .titlerow-a { background-color: #bbb; float: left; width: 175px; } .titlerow-b { background-color: #bbb; float: right; width: 125px; text-align: right; } .row1a { background-color: #fff; float: left; width: 175px; } .row1b { background-color: #fff; float: right; width: 125px; text-align: right; } .row2a { background-color: #ddd; float: left; width: 175px; } .row2b { background-color: #ddd; float: right; width: 125px; text-align: right; } .source { font-size: 11px; text-align: right...
Meantime, home gardeners face the growing problem of what to do with unwanted stocks of hard pesticides-not only DDT but also DDD, dieldrin, aldrin, endrin, chlordane, heptachlor and others. Such long-lived chemicals could not be safely buried; they would sooner or later get into the water supply. Nor could they be incinerated; the dangerous fumes would carry a considerable distance. In fact, the most sensible solution, says...
Planting Fish. What could be done to clean up the mess? The mosquito abatement district switched from the persistent DDD to methyl parathion, a chemical that is effective against gnats but that deteriorates and becomes harmless in a short time. At the same time, the district hired a team of scientists from the University of California at Davis to find a way to control the gnats biologically. Led by Entomologist Sherburne F. Cook Jr., the team decided that a small fresh-water smelt, the Mississippi silverside, might find the gnats appetizing. In 1967 they "planted" 3,000 fingerlings...
...silversides have multiplied prodigiously. They not only eat the gnats but also compete for the nutrients that stimulate algae growth. As a result, the algae are disappearing, and the lake has regained 80% of its original clarity. No longer troubled by DDD, the grebes are making a comeback. This year 82 young birds were born in the area, four times as many as last year. But an ecological balance is not easily restored; large game fish now have to be imported to feed on the wildly proliferating silversides. Once the game fish are established, Californians have to learn that...