Unified Interior Regions

Region 4: Mississippi Basin

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Year Published: 1965

The water story in Central Iowa

"The general welfare of the people of the state of Iowa requires that the water resources of the state be put to beneficial use to the fullest extent of which they are capable."  This can be achieved only by a knowledge and understanding of the water resources - their use, their source, their quality, their availability, and the demands place...

Twenter, F.R.; Coble, R.W.

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Year Published: 1964

Water resources of the English River, Old Mans Creek, and Clear Creek basins in Iowa

The surface and ground water resources of a 991 square mile area comprising the drainage basins of English River, Old Mans Creek and Clear Creek are presented. These basins lie to the west and southwest of Iowa City, Iowa, and all three streams are tributary to the Iowa River. The area is comprised of rolling uplands with relatively broad valleys...

Schwob, H.H.
Water resources of the English River, Old Mans Creek, and Clear Creek basins in Iowa; 1964; OFR; 64-141; Schwob, H. H.

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Year Published: 1963

Insecticides: effects on cutthroat trout of repeated exposure to DDT

Cutthroat trout were periodically exposed to p, pp-DDT, in acetone solution or in the food. Excessive mortality occurred only in lots treated with high concentrations of DDT, probably as a result of decreased resistance to nonspecific stressors. Surviving fish in these lots were significantly larger than those in the control lot, or in the lots...

Allison, Don; Kallman, Burton J.; Cope, Oliver B.; Van Valin, Charles C.

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Year Published: 1963

Reductive dechlorination of DDT to DDD by yeast

Labeled DDD [ 1,1-dichlor-o-2,2-bis(p-chlorophenyl)-ethane] was formed from C14-labeled DDT in the presence of yeast. The formation of DDD from DDE [1,1-dichloro-2,2-bis (p-chlorophenyl)-ethylene] was not observed, indicating that a reductive dechlorination of DDT occurs.

Kallman, Burton J.; Andrews, Austin K.

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Year Published: 1963

Cedar River basin floods

No abstract available

Schwob, Harlan H.

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Year Published: 1963

A plane-type soil sampler

While studying the effects of pesticides on fish and their environment for the Bureau of Sport Fisheries and Wildlife, I have developed a soil sampler that will collect a thin uniform layer of sediment from pond and stream bottoms. As it is becoming increasingly important to analyze the residual deposits of pesticides in this shallow layer of soil...

Frey, Paul J.

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Year Published: 1963

Diffusion of herbicides through plastic film

Plastic film have been used by fishery workers as barriers to subdivide experimental ponds in order to assess the value of some chemical treatment, and as test vessels to contain dilute solutions or suspensions of toxic chemicals in experiments conducted to establish tolerance levels of these chemicals for fish.

Bridges, W.R.; Sanders, Herman O.

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Year Published: 1963

Persistence of DDT and its metabolites in a farm pond

A farm pond near Morrison, Colorado, was treated with 0.02 p.p.m. of DDT in June 1961. The persistence and distribution of the insecticide in materials sampled from the aquatic environment were studied until November 1962. Detectable amounts of DDT were not found in the water after 3 weeks. Residues in the mud had declined within 8 weeks after the...

Bridges, W.R.; Kallman, B.J.; Andrews, A.K.

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Year Published: 1963

Polyethylene as a source of artifacts in the paper chromatography of chlorinated hydrocarbon insecticides

The introduction of artifacts from vessels, materials, and chemicals is a serious problem in the study of pesticide residues. It is therefore of interest to record findings that polyethylene wash bottles contain substances soluble in organic solvents and reactive with the silver nitrate chromogenic spray commonly employed in the paper...

Van Valin, C.C.; Kallman, B.J.; O'Donnell, J.J