Unified Interior Regions

Region 4: Mississippi Basin

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Year Published: 1968

Electrophoretic separation of fish brain esterases

Fish brains were homogenized in an all-glass Potter-Elvehjem-type tissue grinder in 40% sucrose solution. The homogenate concentration was 10 brains/ml for both the bluegill and channel catfish. The brei was centrifuged at 34,700 g for 30 min at 5 C, and 30 J.lliters of the supernatant were used per column for electrophoresis.

Knowles, Charles O.; Arurkar, Suresh K.; Hogan, James W.

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Year Published: 1968

Role of intestinal microflora in the degradation of DDT by rainbow trout (Salmo gairdneri)

Though liver homogenates show apparent microsomal enzyme DDT-dehydrochlorinase activity, in the intact fish the intestinal microflora play a major role in DDT detoxication. Since the presence of this microflora in fish depends on the recent intake of food (12), the rate of detoxication and hence the toxicity of ingested DDT to the rainbow trout...

Wedemeyer, Gary

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Year Published: 1968

Some effects of mirex on two warm-water fishes

The effects of mirex on two species of warm-water fishes were studied in three experiments in which the fish were exposed either by feeding a mirex-treated diet, or by treating the holding ponds with a mirex formulation. Bluegills were used in the feeding experiment, where three different levels of mirex were incorporated into the diet and fed to...

Van Valin, Charles C.; Andrews, Austin K.; Eller, Lafayette L.

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Year Published: 1968

Some enzymatic properties of brain Acetylcholinesterase from bluegill and channel catfish

Using a manometric technique an acetylcholinesterase (EC 3.1.1.7, acetylcholine acetyl-hydrolase) was demonstrated in brain tissue from the bluegill, Lepomis macrochirus Rafinesque, and the channel catfish, Ictalurus punctatus (Walbaum). The activities were 19 and 37 μmoles acetylcholine hydrolyzed/milligram protein per...

Hogan, James W.; Knowles, Charles O.

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Year Published: 1968

The oxidation of drugs by fishes

1. Fish liver microsomal systems have been found to catalyze the hydroxylation of aniline and acetanilide, the N-demethylation of aminopyrine and the O-dealkylation of phenacetin.2. These systems are similar to the corresponding mammalian enzymes and they may be considered to be mixed function oxidase since they require NADPH and oxygen. An...

Buhler, Donald R.; Rasmusson, Mary E.

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Year Published: 1968

The relative toxicities of several pesticides to naiads of three species of stoneflies

Static bioassays were conducted to determine the relative acute toxicities of some insecticides, herbicides, fungicides, a defoliant, and a molluscicide to the naiads of three species of stonef!y, Pteronarcys califomica, Pteronarcella badia, and Claassenia sabulosa. Toxic effects were measured by determination of median lethal concn (Lcoo) for 24...

Sanders, Herman O.; Cope, Oliver B.

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Year Published: 1967

Floods in Rock River basin, Iowa

No abstract available

Carpenter, P.J.
Floods in Rock River basin, Iowa; 1967; OFR; 67-36; Carpenter, P. J.

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Year Published: 1967

Floods on Otter Creek in Linn County, Iowa

No abstract available.

Schwob, H.H.
Floods on Otter Creek in Linn County, Iowa; 1967; OFR; 67-195; Schwob, H. H.

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Year Published: 1967

Availability of ground water in Decatur County, Iowa

Decatur County and several other counties in south-central Iowa comprise an area that has been chronically short of good-quality water.  Municipalities, industries and rural water users alike have been affected by the water shortage.  Municipalities have experienced serious problems in obtaining potable supplies adequate to keep pace...

Cagle, J.W.; Steinhilber, W.L.

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Year Published: 1967

Biodegradation of dichlorodiphenyltrichloroethane: intermediates in dichlorodiphenylacetic acid metabolism by aerobacter aerogenes

The final product of dichlorodiphenyltrichloroethane (DDT) degradation by vertebrates is commonly considered to be dichlorodiphenylacetic acid, DDA. Recently, certain organisms have been found to degrade further DDA to dichlorobenzophenone (DBP), but the possibility that such degradation was due to microbial action could not be excluded....

Wedemeyer, Gary

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Year Published: 1967

Dechlorination of 1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane by Aerobacter aerogenes

Whole cells or cell-free extracts of Aerobacter aerogenes catalyze the degradation of 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT) in vitro to at least seven metabolites: 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE); 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (DDD); 1-chloro-2,2-bis(p-chlorophenyl)ethylene (DDMU); 1-chloro-2...

Wedemeyer, Gary

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Year Published: 1966

Uptake of 2, 4-Dichlorophenoxyacetic acid by Pseudomonas fluorescens

Factors influencing the uptake of the sodium salt of 2,4-dichlorophenoxyacetic acid (2,4-D), under conditions in which no net metabolism occurred, were investigated in an effort to determine both the significance of “nonmetabolic” uptake as a potential agent in reducing pesticide levels and the mechanisms involved. Uptake of 2,4-D was affected by...

Wedemeyer, Gary