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University of Arkansas, Fayetteville

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Articles 331 - 341 of 341

Full-Text Articles in Biology

State Of Cytidine 3', 5' Cyclic Monophosphate (Cyclic Cmp) Research, Joseph E. Stone, Bruce E. Murphy Jan 1981

State Of Cytidine 3', 5' Cyclic Monophosphate (Cyclic Cmp) Research, Joseph E. Stone, Bruce E. Murphy

Journal of the Arkansas Academy of Science

No abstract provided.

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Evaluation Of Undergraduate Courses Taught By Biology Teachers, Jewel E. Moore, Robert T. Kirkwood Jan 1979

Evaluation Of Undergraduate Courses Taught By Biology Teachers, Jewel E. Moore, Robert T. Kirkwood

Journal of the Arkansas Academy of Science

No abstract provided.

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Effects Of Hyperbaric Hypoxia On Some Enzyme Systems In The Mammalian Liver, Dennis A. Baeyens, M. J. Meier Jan 1978

Effects Of Hyperbaric Hypoxia On Some Enzyme Systems In The Mammalian Liver, Dennis A. Baeyens, M. J. Meier

Journal of the Arkansas Academy of Science

The metabolic effects of hypobaric hypoxic stress on the mammalian liver were studied. The lactate dehydrogenase (LDH) and succinate dehydrogenase (SDH) activity of mouse liver homogenates were measured after exposure to an equivalent altitude of 36,000 feet and compared to controls kept at zero altitude. After six and twelve hour incubation periods, the altitude exposed samples demonstrated a significantly higher LDH activity than controls. SDH activity remained unchanged from controls after six hours but was significantly lower than controls after a 12 hour exposure to altitude. It is concluded that the changes in enzyme activity reflect a metabolic control mechanism …

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Ultraviolet Light Reactivation Of Gamma Ray-Induced Lethal Damage In Vertebrate Cells, Stewart W. Cross, H. Gaston Griggs Jan 1978

Ultraviolet Light Reactivation Of Gamma Ray-Induced Lethal Damage In Vertebrate Cells, Stewart W. Cross, H. Gaston Griggs

Journal of the Arkansas Academy of Science

A comparison was made of the extent of UVR of gamma ray induced lethal damage (mitigation of gamma ray-induced lethal effects by appropriate administration of low UV doses) in fish, amphibian, reptile and mammalian tissue culture cell lines. A significant level of UVR was detected in the non-mammalian lines, but the mammalian cells appeared to have lost this ability. Associated mitotic index data is interpreted as supporting the notion that low UV doses, appropriately administered, may aid repair processes in some cells (indirectly) by hindering the antagonistic metabolic processes which convert gamma ray induced lesions to a non-reversible state.

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Evaluation Of Plantings For Wildlife On A Power Line Right Of Way In Southern Arkansas, Robert A. Pierce, Robert T. Kirkwood Jan 1977

Evaluation Of Plantings For Wildlife On A Power Line Right Of Way In Southern Arkansas, Robert A. Pierce, Robert T. Kirkwood

Journal of the Arkansas Academy of Science

The combination of types of land preparation and species of plants seeded along a power line right-of-way was evaluated in terms of the effects upon wildlife. Relative population densities of plants, birds, and mammals were determined for each of the areas under study. A study of the reduction in maintenance costs in relation to the initial investment for preparation and seeding of the land was made

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Development Of Sporangia In Polypodium Aureum Var. Undulatum: Initial Scanning Electron Microscopial Observations, William R. Bowen, David Williams Jan 1977

Development Of Sporangia In Polypodium Aureum Var. Undulatum: Initial Scanning Electron Microscopial Observations, William R. Bowen, David Williams

Journal of the Arkansas Academy of Science

Preliminary SEM observations of developing sori of P. aureum revealed several potential areas for future ultrastructural (SEM and TEM) study, including ontogeny of sporangial initials, annulus differentiation, and sport wall development.

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Oxygen Toxicity In The Mammalian Liver, Dennis A. Baeyens, M. J. Meier Jan 1977

Oxygen Toxicity In The Mammalian Liver, Dennis A. Baeyens, M. J. Meier

Journal of the Arkansas Academy of Science

The effect of hyperbaric oxygen tensions on the oxygen consumption of mouse liver homogenates was investigated. It was found that hyperbaric oxygen rapidly inhibits the oxidative metabolism of the mammalian liver. Mouse liver homogenate exposed to an oxygen tension of 3837.8 mm Hg for 30 minutes demonstrated a 50.6% reduction in oxygen consumption compared to controls exposed to nitrogen at ambient pressure. The effects of reduced glutathione as a protective agent against hyperbaric oxygen toxicity were also examined. Liver homogenates pretreated with reduced glutathione and exposed to hyperbaric oxygen tensions demonstrated greater activity than untreated controls. It is concluded that: …

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Ouachita Biological Station, Richard K. Speairs Jr. Jan 1976

Ouachita Biological Station, Richard K. Speairs Jr.

Journal of the Arkansas Academy of Science

No abstract provided.

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Notes On The Algae Of Arkansas. 1. Chrysococcus, Kephyrion, Kephyriopsis, Pseudokephyrion And Stenokalyx, Richard L. Meyer Jan 1971

Notes On The Algae Of Arkansas. 1. Chrysococcus, Kephyrion, Kephyriopsis, Pseudokephyrion And Stenokalyx, Richard L. Meyer

Journal of the Arkansas Academy of Science

The genera Chrysococcus, Kephyrion, Pseudokephyrion and Stonokalyx have received some consideration by investigators in Europe and in the boreal forest and tundra-range regions of the United States. Many of the species are considered to be cold-water stenotherms, thus occurring more frequently in northern habitats. In the present paper 4 species of Chrysococcus, 4 species of Kephyroin, 2 species of Pseudokephyrion and 2 species of Stenokalyx from Arkansas are discussed.

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Additional Information On Basicladia Crassa Hoffmann And Tilden, Robert G. Anderson, Clarence B. Sinclair Jan 1966

Additional Information On Basicladia Crassa Hoffmann And Tilden, Robert G. Anderson, Clarence B. Sinclair

Journal of the Arkansas Academy of Science

No abstract provided.

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Objectivity In Biology, Cyril E. Abbott Jan 1947

Objectivity In Biology, Cyril E. Abbott

Journal of the Arkansas Academy of Science

No abstract provided.

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