Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons™

Open Access. Powered by Scholars. Published by Universities.®

University of Arkansas, Fayetteville

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 5071 - 5100 of 5639

Full-Text Articles in Life Sciences

Isolation Of Nuclei From Physarum Flavicomum: Demonstration Of Nuclear Cyclic Acid Amp Phosphodiesterase, Judith A. Bean, Maurice G. Kleve, Thomas J. Lynch Jan 1986

Isolation Of Nuclei From Physarum Flavicomum: Demonstration Of Nuclear Cyclic Acid Amp Phosphodiesterase, Judith A. Bean, Maurice G. Kleve, Thomas J. Lynch

Journal of the Arkansas Academy of Science

Cyclic AMP phosphodiesterase activity in the nucleus of the myxomycete Physarum flavicomum was demonstrated by cytochemical staining utilizing electron microscopy and by enzymatic assays with tritiated cyclic AMP as the substrate. Cytochemical staining showed Physarum's plasmodial phosphodiesterase activity to be located in the nucleus, along the plasma membrane, in vesicles, and free in the cytoplasm. Nuclear phosphodiesterase, which may be cell cycle dependent, was primarily located in the nucleolus. Nuclei from three to five day old microplasmodial cultures were isolated by the method of Henney and Yee. Whole cells were collected through centrifugation and washed. Pellets were homogenized in a …

Go to article

Plasma Corticosterone Levels In Cholesterol-Fed Cockerels Before And After A Twenty Minute Run, Stanley N. David, Clarene L. David Jan 1986

Plasma Corticosterone Levels In Cholesterol-Fed Cockerels Before And After A Twenty Minute Run, Stanley N. David, Clarene L. David

Journal of the Arkansas Academy of Science

Cockerels were exercised to observe the influence of physical activity on plasma corticosterone concentrations. The birds were maintained on a commercial mash or on an atherogenic diet. Plasmas were collected on the first day, fifteen days after the first collection and immediately after a 20 minute run on that fifteenth day. The plasma corticosterone levels as determined by radioimmunoassay showed extreme variations within collections. Hence, the data analysis indicated no significant changes of the Compound β in the blood of the cockerels due to diet, or exercise or the combination of both. The causes for the wide variation of plasma …

Go to article

Special Adaptations Of Orb Weavers And Prey, Peggy Rae Dorris Jan 1986

Special Adaptations Of Orb Weavers And Prey, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

Orb weaving spiders have devised both webs and special devices for capturing prey. The prey have also evolved mechanisms for eluding spiders and for living with them. Some of the mechanisms involved are discussed in this paper.

Go to article

Tagging And Marking Crawfish (Procambarus Clarkii) In A Population Estimation Study, Frank Meriweather Jan 1986

Tagging And Marking Crawfish (Procambarus Clarkii) In A Population Estimation Study, Frank Meriweather

Journal of the Arkansas Academy of Science

Crawfish (Procambarus clarkii) were tagged with enumerated plastic streamers and released in 0.1-ha ponds to observe recapture frequency in stand-up traps. Also, crawfish were marked by a uropod punch, released and recaptured in 0.1-ha ponds for population estimation. Survival of streamer-tagged crawfish in indoor tanks averaged 46.7% after 25 days, indicating that tagging caused stress leading to mortality, especially during molt. Recapture frequencies of tagged crawfish indicated sampling bias which obviated use of the tagging method in population assessments. Short term (3-day) survival of marked crawfish (92%) and retention of the mark after molt indicated potential application in population assessment …

Go to article

Effects Of Juglone (5'-Hydroxy-1, 4-Naphthoquinone) On The Algae Anabaena Flos-Aquae, Nostoc Commune, And Scenedesmus Acuminatus, V. Diane Randall, Jimmy D. Bragg Jan 1986

Effects Of Juglone (5'-Hydroxy-1, 4-Naphthoquinone) On The Algae Anabaena Flos-Aquae, Nostoc Commune, And Scenedesmus Acuminatus, V. Diane Randall, Jimmy D. Bragg

Journal of the Arkansas Academy of Science

Three species of algae, Anabaena flos-aquae, Nostoc commune and Scenedesmus acuminatus were selected for their sensitivity to juglone and studied for the effects of juglone concentrations of 10, 1, 0.5, 0.1 and 0.01 μg/ml upon their growth. A. flos-aquae was most sensitive, with significant inhibition by the 0.5 μg/ml concentration. N. commune was inhibited least, with significant inhibition only in the 10 μg/ml concentration. S. acuminatus was found to be moderately inhibited at the 0.5 μg/ml concentration. All species were found to be non-viable after 14 days exposure to 10 μg/ml juglone. Tests with 7 and 14 day old cells …

Go to article

Optimal Conditions For Kinetic Study Of Succinate Dehydrogenase In Rat Liver, Collie B. Shaw, Tara L. Chronister, John D. Peck Jan 1986

Optimal Conditions For Kinetic Study Of Succinate Dehydrogenase In Rat Liver, Collie B. Shaw, Tara L. Chronister, John D. Peck

Journal of the Arkansas Academy of Science

Succinate dehydrogenase (SDH) commonly is assayed as a marker enzyme for mitochondrial activity. The literature presents numerous conditions for conducting this assay due to the fact that, it has been difficult to get sufficient reduction of the acceptor dye, 2,3,5-triphenyl-2H-tetrazolium chloride (TTC). This study was undertaken to optimize the SDH-catalyzed reduction of TTC dye by evaluation of a greater range of molor ratios of TTC to succinate and by further evaluation of additives reported as beneficial. Improvement in enzyme specific activity was achieved by liver perfusion via the left cardiac ventricle with homogenizing solution. Increase in TTC from 1 to …

Go to article

Bat Fauna Of Southeast Arkansas, Tim W. Steward, V. Rick Mcdaniel, David A. Saugey, Daniel R. England Jan 1986

Bat Fauna Of Southeast Arkansas, Tim W. Steward, V. Rick Mcdaniel, David A. Saugey, Daniel R. England

Journal of the Arkansas Academy of Science

A systematic survey of the mammalian fauna of Southwest Arkansas has resulted in the accumulation of more than 200 records of bats from the 21 counties comprising the study area. The records reveal distributional patterns for 12 species of bats and represent a total of 68 new county records for this area of Arkansas.

Go to article

Spiders Collected In Southeast Arkansas Using Pitfall Traps Placed In Pine-Hardwood Forests That Received Various Forestry Treatments--A Preliminary List, Peggy Rae Dorris, L. C. Thompson Jan 1986

Spiders Collected In Southeast Arkansas Using Pitfall Traps Placed In Pine-Hardwood Forests That Received Various Forestry Treatments--A Preliminary List, Peggy Rae Dorris, L. C. Thompson

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Usefulness Of Microfiche Reader/Printer For Studying Fish Species, Raj V. Kilambi, Marvin L. Galloway Jan 1986

Usefulness Of Microfiche Reader/Printer For Studying Fish Species, Raj V. Kilambi, Marvin L. Galloway

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Survey Of The Interior Least Tern On The Arkansas And White Rivers In Arkansas, Kenneth L. Smith Jan 1986

Survey Of The Interior Least Tern On The Arkansas And White Rivers In Arkansas, Kenneth L. Smith

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Dryopteris Carthusiana At Mt. Magazine, Logan Co., Arkansas, James H. Peck Jan 1986

Dryopteris Carthusiana At Mt. Magazine, Logan Co., Arkansas, James H. Peck

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Additional Records Of Distribution And Hosts For The Bat Bug, Cimex Pilosellus In Arkansas, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England Jan 1986

Additional Records Of Distribution And Hosts For The Bat Bug, Cimex Pilosellus In Arkansas, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Effect Of Stunting On The Growth Of Blue Tilapia (Tilapia Aurea, Cichlidae), Les Torrans, Fran Lowell Jan 1986

Effect Of Stunting On The Growth Of Blue Tilapia (Tilapia Aurea, Cichlidae), Les Torrans, Fran Lowell

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Population Trends Of The Loggerhead Shrike (Lanius Ludovicianus) In Arkansas, Fred L. Burnside Jr., William M. Shepherd Jan 1985

Population Trends Of The Loggerhead Shrike (Lanius Ludovicianus) In Arkansas, Fred L. Burnside Jr., William M. Shepherd

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Effects Of Temperature And Crowding On The Pathogenicity Of Edwardsiella Ictaluri In Channel Catfish (Ictalurus Punctatus), Sharon L. Johnson, Lawrence W. Hinck Jan 1985

Effects Of Temperature And Crowding On The Pathogenicity Of Edwardsiella Ictaluri In Channel Catfish (Ictalurus Punctatus), Sharon L. Johnson, Lawrence W. Hinck

Journal of the Arkansas Academy of Science

Channel catfish were injected with Edwardsiella ictaluri and stocked at increasing temperatures and densities. Bacteriological examination of kidney, liver and spleen revealed the greatest numbers of organisms in fish from the highest temperature and stocking density tested. Survival time was the shortest for fish held at the highest temperature and stocking density. Increased temperature and crowding were directly proportional to the number of organisms recovered from the organs and inversely proportional to fish survival time.

Go to article

Flow Reduction May Explain Sporadic Occurrence Of Craspedacusta Sowerbyi (Trachylina) Medusae, Peter P. Brussock, Lawrence D. Willis, Arthur V. Brown Jan 1985

Flow Reduction May Explain Sporadic Occurrence Of Craspedacusta Sowerbyi (Trachylina) Medusae, Peter P. Brussock, Lawrence D. Willis, Arthur V. Brown

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Notes On The Death Of An Introduced Black Bear In Arkansas, Joseph D. Clark Jan 1985

Notes On The Death Of An Introduced Black Bear In Arkansas, Joseph D. Clark

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Notes On Three Palustrine Natural Community Types In The Arkansas Ozarks, Steve L. Orzell, William F. Pell, Gary E. Tucker Jan 1985

Notes On Three Palustrine Natural Community Types In The Arkansas Ozarks, Steve L. Orzell, William F. Pell, Gary E. Tucker

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Concanavalin A-Binding Enzymes Of Crotalus Scutulatus Scutulatus Venom, Michael W. Hinson, C. K. Childs, Bob D. Johnson, Dewey H. Sifford Jan 1985

Concanavalin A-Binding Enzymes Of Crotalus Scutulatus Scutulatus Venom, Michael W. Hinson, C. K. Childs, Bob D. Johnson, Dewey H. Sifford

Journal of the Arkansas Academy of Science

Crotalus scutulatus scutulatus crude venom was separated into two fractions by Concanavalin A Sepharose 4B affinity chromatography. The proteins binding to Con A exhibited phosphomonoesterase (orthophosphoric monoester phosphohydrolase EC 3.1.3.2), phosphodiesterase, 5'-nucleotidase (5'-ribonucleotide phosphohydrolase EC 3.1.3.5), phospholipase A(phosphatidate 2-acylhydrolase EC 3.1.1 .4), hyaluronidase (hyaluronate glycanohydrolase EC 3.2.1 d), N-benzoyl-L-arginine ethyl esterase, p-toluenesulfonyl-L-arginine methyl esterase, L-amino acid oxidase (L-amino acid: 02 oxidoreductase [deaminating] EC 1.4.3.2), and caseinolytic activities. Thrombin-like and NAD nucleosidase (5'-ribonucleotide phosphohydrolase EC 3.1.3.5) activities were not observed. The crude venom and the fraction containing the glycoproteins which bound to Con A were fractionated by DEAE Sephadex A-50 ion …

Go to article

Heterogenity Of The Spawning Populations Of Surf Smelt In The State Of Washington, Raj V. Kilambi Jan 1985

Heterogenity Of The Spawning Populations Of Surf Smelt In The State Of Washington, Raj V. Kilambi

Journal of the Arkansas Academy of Science

Biometric comparisons of three spawning populations of surf smelt, one from Pacific Coast and two from Puget Sound, were made. The Puget Sound populations (Hood Canal and Utsaladdy) were more similar to each other compared to the ocean populations. The Hood Canal and Utsaladdy smelt exhibited least distance function, D^2 , and greater overlap of meristic characters compared to the Lapush fish. It was postulated that the Puget Sound smelt populations were derived from the ocean smelt some 13,000 or more years ago.

Go to article

Analysis Of Arkansas Fur Harvest Records - 1942-1984: Ii. Species Accounts, James H. Peck, Joseph D. Clark, Tiny Sheldon, Gary A. Heidt Jan 1985

Analysis Of Arkansas Fur Harvest Records - 1942-1984: Ii. Species Accounts, James H. Peck, Joseph D. Clark, Tiny Sheldon, Gary A. Heidt

Journal of the Arkansas Academy of Science

Fur harvest records were maintained by the Arkansas Game and Fish Commission on the following 16 furbearers: badger, beaver, bobcat, eastern spotted skunk (civet), coyote, gray fox, long-tailed weasel, mink, muskrat, nutria, opossum, raccoon, red fox, red wolf, river otter, and striped skunk. These harvest records were analyzed for each species in terms of mean pelt price and numbers of pelt sold by region (Ozark Mountains, Ouachita Mountains, Gulf Coastal Plain, and Mississippi Delta) per year. Historical or biological influences important in interpreting species accounts are presented.

Go to article

Changes In Forest Soils Following Clearcutting Of Pine Forests In The Ouachita Mountains Of Arkansas, Harlan R. Stoin, Bajuri Bin Kadmin, Lyell F. Thompson Jan 1985

Changes In Forest Soils Following Clearcutting Of Pine Forests In The Ouachita Mountains Of Arkansas, Harlan R. Stoin, Bajuri Bin Kadmin, Lyell F. Thompson

Journal of the Arkansas Academy of Science

Soil characteristics of the mineral surface soil (0-6 cm) on three small watersheds in the Ouachita Mountains of Arkansas from which the pine forests have been clearcut, crushed, and burned for site preparation were studied for the first two years following clearcutting and compared to soils from adjacent uncut pine forest watersheds. Following clearcutting and burning, soil pH was generally higher than in uncut forest soils. The greatest pH differences occurred within several months of burning and generally decreased through the end of the second year. Soil organic matter content was lower immediately following clearcutting and burning and increased to …

Go to article

Fall Deer Food Selection In The Ouachita National Forest, James D. Fenwood, David A. Saugey, Carl A. Racchini Jan 1985

Fall Deer Food Selection In The Ouachita National Forest, James D. Fenwood, David A. Saugey, Carl A. Racchini

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Synopsis Of The Hydrometridae Of Arkansas, George L. Harp Jan 1985

Synopsis Of The Hydrometridae Of Arkansas, George L. Harp

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Distribution And Status Of Etheostoma Cragini Gilbert And E. Microperca Jordan And Gilbert In Arkansas, John L. Harris, Kenneth L. Smith Jan 1985

Distribution And Status Of Etheostoma Cragini Gilbert And E. Microperca Jordan And Gilbert In Arkansas, John L. Harris, Kenneth L. Smith

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Pesticide Use In The 1983 Soybean Crop: Report Of A Survey Of Arkansas Producers, Joseph D. Waldrum Jan 1985

Pesticide Use In The 1983 Soybean Crop: Report Of A Survey Of Arkansas Producers, Joseph D. Waldrum

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Analysis Of Arkansas Fur Harvest Records - 1942-1984: Iii. Harvest-Price Relationships, Joseph D. Clark, Gary A. Heidt, Tina Sheldon, James H. Peck Jan 1985

Analysis Of Arkansas Fur Harvest Records - 1942-1984: Iii. Harvest-Price Relationships, Joseph D. Clark, Gary A. Heidt, Tina Sheldon, James H. Peck

Journal of the Arkansas Academy of Science

Correlation and linear regression analyses between mean annual pelt price and total harvest of 13 Arkansas furbearer species between 1965 and 1983 were performed for state and regions (Ozark Mountains, Ouachita Mountains, Gulf Coastal Plain, and Mississippi Delta). Statewide, strong correlations (r > 0.80) were identified for bobcat (Felis rufus), coyote (Canis latrans), gray fox (Urocyon cinereoargenteus), mink (Mustela vison), nutria (Myocastor coypus), opossum (Didelphis virginiana), and raccoon (Procyonlotor). Moderate correlations (r = 0.55 - 0.79) were identified for eastern spotted skunk (Spilogale putorius), muskrat (Ondatra zibethicus), river otter (Lutra canadensis), and striped skunk (Mephitis mephitis). Nonsignificant correlations (r < 0.468) were shown for beaver (Castor canadensis) and long-tailed weasel (Mustela frenata). Regional differences were noted for each species.

Go to article

New And Interesting Plants For The Arkansas Flora, Edward Leon Richards Jan 1985

New And Interesting Plants For The Arkansas Flora, Edward Leon Richards

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Effects Of Growth Temperatures On The Fatty Acid Composition Of Isolated Chloroplasts From Two Species Differing In Heat Sensitivity, Roy Z. Gehring, Glenn W. Todd Jan 1985

Effects Of Growth Temperatures On The Fatty Acid Composition Of Isolated Chloroplasts From Two Species Differing In Heat Sensitivity, Roy Z. Gehring, Glenn W. Todd

Journal of the Arkansas Academy of Science

Lipid analyses of chloroplasts isolated from wheat (Triticum aestivum L. cv. Arthur) and milo (Sorghum bicolor cv. Funk's hybrid 522) suggest no major heat effect on lipid class distribution. Assuming milo is more heat tolerant than wheat and that increased saturated/unsaturated fatty acid values increase thermal stability, changes in sulfoquinovosyldiglyceride (SL) appear to be more important than phosphatidylglycerol (PG) in conferring thermal stability to isolated chloroplasts.

Go to article

Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring Jan 1985

Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring

Journal of the Arkansas Academy of Science

Dormant cuttings of Salix nigra Marsh, were exposed to gamma radiation from a cobalt-60 source at a dose rate of 1110 roentgens (r) per minute. Exposure doses ranged from 50 r through 100 Kr with 100% mortality at 10 Kr. Low doses of ionizing radiation apparently stimulated growth, while higher doses progressively retarded growth. The growth of the staminate catkins was inversely proportional to total exposure dose (increased dose resulted in progressively decreased growth). Determination of growth rates at different intervals post-irradiation indicated recovery of the surviving fraction of the irradiated cuttings. At ninety days, the highest growth rate occurred …

Go to article

First Prev Next Last