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University of Minnesota Morris Digital Well

Journal

1982

Articles 1 - 12 of 12

Full-Text Articles in Life Sciences

Vascular Plants, Excluding Island Sites, Of Lake Of The Woods County, Minnesota, Janet Boe Jan 1982

Vascular Plants, Excluding Island Sites, Of Lake Of The Woods County, Minnesota, Janet Boe

Journal of the Minnesota Academy of Science

It is likely that almost 150 newly-recorded items were collected and identified during a study of the vascular flora of Lake of the Woods county on Minnesota's northern border with Canada. This collection apparently extended the known range of a number of plants within the state and also noted sites of several plants of which there are only a few collections in Minnesota The study was conducted as part of the author's Master of Science degree program at the University of Minnesota.

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Association Of Dna With Nuclear Estradiol Receptors Released From Chromatin, Thresia Thomas, Benjamin S. Leung Jan 1982

Association Of Dna With Nuclear Estradiol Receptors Released From Chromatin, Thresia Thomas, Benjamin S. Leung

Journal of the Minnesota Academy of Science

A cell-free system was established to study the role of steroid hormones In transcriptional control. The system consists of hormone-receptor-chromatin complex formation using partially purified receptor and chromatin. Micrococcal nuclease digestion of the complex released a 7S form of receptor. The absorbance at 260 nm also showed a peak in the 7S region of the sucrose gradient. DNAase I digestion caused the 7S receptor to shift to 2.8S form, while RNAase had no effect. When the receptor-chromatin complex was digested with DNAase I, different forms of receptors were observed, depending on the digestion time. Digestion of one minute produced a …

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Catalase Activity In Crown Galls, Helianthus Annuus, Mark C. Bildsoe Jan 1982

Catalase Activity In Crown Galls, Helianthus Annuus, Mark C. Bildsoe

Journal of the Minnesota Academy of Science

Crown gall is a neoplastic disease in plants initiated by a specific bacterium, Agrobacterium tumefaciens. The objective of this investigation was to describe quantitatively the relationship between the autonomous growth of crown galls and the activity of the metabolic enzyme catalase. The catalase bioassay revealed a substantial increase In the amount of catalase present in tumor tissues as compared to corresponding healthy tissues in Helianthus annuus. Observations concerning growth activity of the two tissues indicated a significant growth increase in the crown galls.

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Earthworms Of Two Minnesota Forest Areas, R. O. Morgenweck, W. H. Marshall Jan 1982

Earthworms Of Two Minnesota Forest Areas, R. O. Morgenweck, W. H. Marshall

Journal of the Minnesota Academy of Science

This paper reviews Lumbricidae records for Minnesota and reports on two collections in northern areas of the state. The first site, Itasca State Park, lies to the northwest with "Maple-basswood representative of climax forest to the south and southeast" and " Spruce-fir stands representative of climax forest to the north and northeast" (Buell and Gordon 1945). The Cloquet Forestry Center (CFC); site of the other collection, is near Duluth, 150 miles to the east, where the forests are largely coniferous. Here seven forest types, as described by Wenstrom (1973), and known to be used by American woodcock (Philohela minor), were …

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A Vertebrate Survey Of Kasota Prairie, Kenneth Hessenius Jan 1982

A Vertebrate Survey Of Kasota Prairie, Kenneth Hessenius

Journal of the Minnesota Academy of Science

Kasota Prairie is a 30-acre tract of near-virgin prairie in Le Seur County, Minnesota. The vertebrate population at the prairie was studied to determine its significance as habitat for those species. Several species of birds which require prairie or prairie-like habitat were found to be nesting there. Many other avian species also utilize the area for feeding purposes. Small mammal populations were highly influenced by annual prairie maintenance burning.

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Browse Use By Eastern Cottontails In A S.E. Minnesota Farmstead Shelterbelt, Robert K. Swihart, Richard H. Yahner Jan 1982

Browse Use By Eastern Cottontails In A S.E. Minnesota Farmstead Shelterbelt, Robert K. Swihart, Richard H. Yahner

Journal of the Minnesota Academy of Science

Use of woody vegetation as winter food by eastern cottontails (Sylvilagus floridanus) was investigated in a southeastern Minnesota farmstead shelterbelt. Cottontails browsed on 11 species but exhibited a clear preference only for gooseberry (Ribes spp). When snow covered herbaceous vegetation during late winter, cottontails relied more heavily on high fiber, lower protein woody browse. Shelterbelt management that allows invasion of gooseberry and blackcap raspberry (Rubus occidentalis) provides winter food for cottontails and may reduce damage to planted trees.

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Aquaculture In Cooling Water Recirculated From A Generating Plant, John G. Woiwode, Ira R. Adelman Jan 1982

Aquaculture In Cooling Water Recirculated From A Generating Plant, John G. Woiwode, Ira R. Adelman

Journal of the Minnesota Academy of Science

Recirculating cooling water from an electric generating plant accumulated dissolved and suspended solids up to ten times that of the make-up water from the Mississippi River. Channel catfish (lctalurus punctatus) and tilapia (Tilapia mossambica) were grown In the cooling water, in clear well water, and in a mixture of the two for seven months as part of an investigation of the use of cooling water for commercial aquaculture. Health of both species was generally excellent in test and control waters; growth was commercially acceptable; bioaccumulation of contaminants was negligible. Organoleptic taste quality was not acceptable, although the cause of the …

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Effects Of Various Hormones On Human Carcinoma Cell Proliferation, Y. L. Gao, B. S. Leung, A. H. Potter, W.C.Y. Yu Jan 1982

Effects Of Various Hormones On Human Carcinoma Cell Proliferation, Y. L. Gao, B. S. Leung, A. H. Potter, W.C.Y. Yu

Journal of the Minnesota Academy of Science

Cell proliferation of a mammary adenocarcinoma cell line, CAMA-1. is affected by a number of steroid hormones and prolactin in long-term cultures. Estrogenic compounds stimulate cell growth while antiestrogenic compounds inhibit it. Prolactin can synergize the estrogenic effect. Progesterone, glucocorticoid or androgen reduce cell proliferation. Dihydrotestosterone is a very potent inhibitor,- effective at as low as 10 nM, and its effect is independent of estrogen action. Cortisol is a less effective inhibitor at concentrations below 10 nM; at these levels cortisol exhibits a slight inhibition which appears to be unrelated to estrogenic action. However, at higher concentrations, cortisol markedly reduces …

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Introduced Annual Eriogonum In Minnesota, Charles L. Argue, Steven R. Argue Jan 1982

Introduced Annual Eriogonum In Minnesota, Charles L. Argue, Steven R. Argue

Journal of the Minnesota Academy of Science

A selected summary of the utility of data derived from the recording and analysis of immigrant plant species is considered in relation to an apparently Introduced Minnesota population of Eriogonum annuum Nutt., the Annual Eriogonum. Fruiting specimens and one flowering-specimen of this species, heretofore reported on xeric sites from the western Dakotas, Montana, and Wyoming south into Mexico, were collected October 13, 1982, on the Sherburne National Wildlife Refuge near Zimmerman, Minnesota, and represent the first records of an Eriogonum in this state.

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Minnesota Colonial Waterbird Nesting Site Inventory, Carrol L. Henderson Jan 1982

Minnesota Colonial Waterbird Nesting Site Inventory, Carrol L. Henderson

Journal of the Minnesota Academy of Science

Since colonial nesting waterbirds comprise an Important portion of Minnesota's avifauna, it Is important to establish an accurate Inventory of their nesting areas. Knowledge of the status of these species can be used to assess the level of the state's environmental quality. The inventory is also useful in aiding planners and developers so that undesirable impacts on colonies can be avoided or minimized. The Nongame Wildlife Program in the Department of Natural Resources has identified 239 colony sites in Minnesota which are occupied by 16 species. This Inventory process is the first step necessary to carry out future research, management, …

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Utilization Of Wood Duck Nest Boxes By Wildlife Near Cohasset, Minnesota, Robert T. Bohm Jan 1982

Utilization Of Wood Duck Nest Boxes By Wildlife Near Cohasset, Minnesota, Robert T. Bohm

Journal of the Minnesota Academy of Science

Twenty-seven wood duck boxes located along the Mississippi River near Cohasset, Minnesota were monitored for winter and spring wildlife use from 198o-1982. During these three yearn, overall nest box use was 84 percent, 72 percent, and 82 percent, respectively; winter utilization was 44 percent, 56 percent, and 68 percent; spring utilization was 48 percent, 44 percent, and 37 percent. Most winter use was by red squirrels, gray squirrels, and starlings. Principal spring use was by wood ducks and common goldeneyes, During the course of the study, wood duck use decreased and common goldeneye use Increased. Aspects of the nesting season …

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Aquaculture In Recirculating Cooling Water From An Electric Generating Plant, John G. Woiwode, Ira R. Adelman Jan 1982

Aquaculture In Recirculating Cooling Water From An Electric Generating Plant, John G. Woiwode, Ira R. Adelman

Journal of the Minnesota Academy of Science

Recirculating cooling water from an electric generating plant accumulated dissolved and suspended solids up to ten times that of the make-up water from the Mississippi River. Channel catfish (Ictalurus punctatus) and tilapia (Tilapia mossambica) were grown in the cooling water, in clear well water, and in a mixture of the two for seven months as part of an investigation of the use of cooling water for commercial aquaculture. Health of both species was generally excellent In test and control waters; growth was commercially acceptable; bioaccumulation of contaminants was negligible. Organoleptic quality was not acceptable, although the cause of the off-flavor …

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