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Articles 1 - 27 of 27
Full-Text Articles in Life Sciences
Continued Ddt Persistence In Mississippi River Delta Streams: A Case Study, Stephen A. Sewell, Luther A. Knight Jr.
Continued Ddt Persistence In Mississippi River Delta Streams: A Case Study, Stephen A. Sewell, Luther A. Knight Jr.
Journal of the Arkansas Academy of Science
Fish samples representative of several trophic levels were taken from the Wolf and Loosahatchie Rivers of western Tennessee during the early 1980s. Results indicate that DDT, with metabolites DDD and DDE, remains common in fish tissues in these areas and approaches the levels recommended as maxima for human consumption by the U.S. Food and Drug Administration. Samples of top carnivores and forage fishes, particularly the gizzard shad, Dorosoma cepedlanum, commonly exceeded 500 ppb DDE. The results are discussed in light of sediment disturbing activities.
Forest Data Base For Arkansas, Richard A. Kluender, E. Wesley Mccoy
Forest Data Base For Arkansas, Richard A. Kluender, E. Wesley Mccoy
Journal of the Arkansas Academy of Science
No abstract provided.
Dryopteris Carthusiana At Mt. Magazine, Logan Co., Arkansas, James H. Peck
Dryopteris Carthusiana At Mt. Magazine, Logan Co., Arkansas, James H. Peck
Journal of the Arkansas Academy of Science
No abstract provided.
Isolation Of Nuclei From Physarum Flavicomum: Demonstration Of Nuclear Cyclic Acid Amp Phosphodiesterase, Judith A. Bean, Maurice G. Kleve, Thomas J. Lynch
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 …
Concanavalin A-Nonbinding Enzymes Of Crotalus Scutulatus Scutulatus Venom, C. K. Childs, Michael W. Hinson, Dewey H. Sifford, Bob D. Johnson
Concanavalin A-Nonbinding Enzymes Of Crotalus Scutulatus Scutulatus Venom, C. K. Childs, Michael W. Hinson, Dewey H. Sifford, Bob D. Johnson
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 Concanavalin A-nonbinding fraction (F-l) 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-Larginine ethyl esterase, p-toluenesulfonyl-L-arginine methyl esterase, L-amino acid oxidase (L-amino acid: O2 oxidoreductase [deaminating] EC 1.4.3.2), and caseinolytic activities. Thrombin-like and NAD nucleosidase (5 '-ribonudeotide phosphohydrolase EC 3.1.3.5) activities were not observed. DEAE Sephadex A-50 ion exchange chromatography by two stage elution of F-l yielded several fractions having proteinase activities. Proteinase …
River Otter In Arkansas. Iv. Winter Food Habits In Eastern Arkansas, C. Renn Tumlison, Anthony W. King, V. Rick Mcdaniel
River Otter In Arkansas. Iv. Winter Food Habits In Eastern Arkansas, C. Renn Tumlison, Anthony W. King, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
Stomachs and intestines of 89 river otters (Lutra canadensis) collected in eastern Arkansas during the trapping seasons (December- January) of 1978-1983 were examined for food remains. Fish (primarily centrarchids, catostomids, and clupeids) dominated the diet (71.2%). The next most abundant prey was crayfish (18.3% of the diet). Other foods included gray squirrel (Sciurus carolinensis), wood duck (Aixsponsa), snakes (Thamnophis proximus), frogs (Ranidae and Hylidae), and beetles (Coleoptera).
Harvest Trends Of The Bobcat (Felix Rufus) In Arkansas, C. Renn Tumlison, V. Rick Mcdaniel
Harvest Trends Of The Bobcat (Felix Rufus) In Arkansas, C. Renn Tumlison, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
Arkansas bobcat fur harvest records were examined in relation to forest cover, furbuyer distribution, and price. Availability of forest cover correlated with areas of greatest harvest, and a dynamic forest products industry in southern Arkansas is believed to support a greater density, and therefore greater harvest, of bobcats. Comparison of furbuyer distribution with harvest level among physiographic regions suggested that the fur industry in southern Arkansas could expand. Prices increased dramatically in the 1970's, and 94.5% of the variation in harvest level could be explained by price.
Survey Of The Interior Least Tern On The Arkansas And White Rivers In Arkansas, Kenneth L. Smith
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.
Effects Of Low Ph On Lactate Dehydrogenase Kinetics Of Diving And Nondiving Reptiles, Dennis A. Baeyens, Salim R. Hurley
Effects Of Low Ph On Lactate Dehydrogenase Kinetics Of Diving And Nondiving Reptiles, Dennis A. Baeyens, Salim R. Hurley
Journal of the Arkansas Academy of Science
The properties of lactate dehydrogenase were examined in two snake species, Nerodia rhombifera and Elaphe obsoleta, and a turtle species, Pseudemys scripta. Our purpose was to compare the LDH activity of reptiles with limited anaerobic capabilities with that of the well established diver Pseudemys. The Michaelis-Menten kinetics of LDH and its susceptibility to inhibition by elevated pyruvate concentrations were investigated in the brain and heart of the three species. All tissue incubations and enzyme activity determinations were done at a pH of 7.0 in order to stimulate a diving blood pH in the three species. In both tissues the LDH …
Special Adaptations Of Orb Weavers And Prey, Peggy Rae Dorris
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.
Abandoned Mine Fauna Of The Ouachita Mountains, Arkansas: Vertebrate Taxa, Darrell R. Heath, David A. Saugey, Gary A. Heidt
Abandoned Mine Fauna Of The Ouachita Mountains, Arkansas: Vertebrate Taxa, Darrell R. Heath, David A. Saugey, Gary A. Heidt
Journal of the Arkansas Academy of Science
Numerous visits, over the past four years, of 27 abandoned mines in the Ouachita Mountains of Arkansas revealed that the mines are serving as hibernacula, breeding sites, and permanent or temporary habitats for numerous vertebrates. The following species were observed either directly or by sign: Class Amphibia, Order Urodela — Eurycea multiplicata, Desmognathus brimleyorum, Plethodon caddoensis, P. glutinosus. Order Anura — Gastrophyrne carolinensis, Rana palustris, R. catesbeiana. Class Reptilia, Order Squamata, Suborder Serpentes — Thamnophis proximus, Diadophis punctatus, Elaphe obsoleta, Nerodia erythrogaster, Agkistrodon contortrix. Class Aves, Order Passeriformes--Sayornis phoebe. Order Strigiformes — Otus asio. Class Mammalia, Order Marsupialia —Didelphis virginiana. …
Survey Of 1985 Periodical Cicada (Homoptera: Magicicada) Emergence Sites In Washington County, Arkansas, With Reference To Ecological Implications, Douglas A. James, Kathy S. Williams, Kimberly G. Smith
Survey Of 1985 Periodical Cicada (Homoptera: Magicicada) Emergence Sites In Washington County, Arkansas, With Reference To Ecological Implications, Douglas A. James, Kathy S. Williams, Kimberly G. Smith
Journal of the Arkansas Academy of Science
Systematic roadside surveys were conducted in June 1985 in Washington County, Arkansas, to locate areas where 13-year periodical cicadas had emerged during May. Although cicadas were found in a variety of upland and bottom land forest habitats, the present cicada distribution reflects the original forest and prairie pattern in the county, even though those boundaries are now largely lost. This suggests a high degree of philopatry whereby emergency areas have remained in the same area for the last 100 years. All present day emergence areas are within the White River drainage, suggesting that it was the main cicada dispersal route …
Woody Vegetation Of The Crystal Mountains Region, Derwood Mayo, P. L. Raines
Woody Vegetation Of The Crystal Mountains Region, Derwood Mayo, P. L. Raines
Journal of the Arkansas Academy of Science
Arms-length rectangle transects and nested quadrats were used to sample overstory, understory and shrub layers on south-facing mountains, north-facing mountains and flat areas along Collier and Montgomery Creeks in Montgomery County, Arkansas. Data were collected and used to calculate importance values for trees and density values for shrubs. These data indicate that the shortleaf pine-oak forest type occurs on south-facing mountains while variants of white oak-black oak-northern red oak type occur on north-facing mountains and flat areas. Beech (Fagus grandifolia Var. caroliniana [Loud.] Fern and Rehd.) is common along Collier Creek and is completely absent from Montgomery Creek watershed. The …
Relationship Between Diameter Breast High And Diameter Near Ground Line For Hardwood Species In Arkansas, Richard A. Kluender, Jimmie L. Yeiser
Relationship Between Diameter Breast High And Diameter Near Ground Line For Hardwood Species In Arkansas, Richard A. Kluender, Jimmie L. Yeiser
Journal of the Arkansas Academy of Science
The relationship of diameter breast high (DBH) and diameter near ground line (DNG) was investigated for three groups of Arkansas hardwoods from four physiographic regions in the state. The relationship between DBH and DNG did not vary significantly across species groups or physiographic regions. Equations of both linear and non-linear form were developed to estimate DBH from DNG. The relationships between DBH and DNG is used to estimate timber volume, growth, and value from residual stumps. The relationship is also useful in harvesting system design and cost estimation in operational forestry.
Age And Growth Of Redear Sunfish Lepomis Microlophus (Gunthur), From Bob Kidd Lake, Rex R. Roberg, Thoniot T. Prabhakaran, Raj V. Kilambi
Age And Growth Of Redear Sunfish Lepomis Microlophus (Gunthur), From Bob Kidd Lake, Rex R. Roberg, Thoniot T. Prabhakaran, Raj V. Kilambi
Journal of the Arkansas Academy of Science
Total lengths (62-285mm) and body scales from 75 redear sunfish collected by electroshocking from Bob Kidd Lake during October and November 1985 were used for this study. The length-frequency distribution yielded five age groups, however, the body scale analysis revealed eight age groups. The total length scale radius relationship was estimated as, TL = 17.98 + 0.92 Sr . Lengths attained at earlier ages were estimated by the Fraser-Lee method and the Bertlanffy growth model was fitted to the lengths for ages five through ten, and the resulting equation, L₁ = 295 [1 - exp — 0.29 (t - 1.83)], …
Optimal Conditions For Kinetic Study Of Succinate Dehydrogenase In Rat Liver, Collie B. Shaw, Tara L. Chronister, John D. Peck
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 …
Usefulness Of Microfiche Reader/Printer For Studying Fish Species, Raj V. Kilambi, Marvin L. Galloway
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.
Bat Fauna Of Southeast Arkansas, Tim W. Steward, V. Rick Mcdaniel, David A. Saugey, Daniel R. England
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.
Plasma Corticosterone Levels In Cholesterol-Fed Cockerels Before And After A Twenty Minute Run, Stanley N. David, Clarene L. David
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 …
Tagging And Marking Crawfish (Procambarus Clarkii) In A Population Estimation Study, Frank Meriweather
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 …
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
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 …
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
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.
Additional Records Of Distribution And Hosts For The Bat Bug, Cimex Pilosellus In Arkansas, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England
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.
Comparison Of The Symbiotic Fauna Of The Family Plethodontidae In The Ouachita Mountains Of Western Arkansas, Douglas A. Winter, Wojciech M. Zawada, Arthur A. Johnson
Comparison Of The Symbiotic Fauna Of The Family Plethodontidae In The Ouachita Mountains Of Western Arkansas, Douglas A. Winter, Wojciech M. Zawada, Arthur A. Johnson
Journal of the Arkansas Academy of Science
During the spring of 1985, 101 salamanders representing six host species (29 Plethodon ouachitae, 25 P. caddoensis, 6 P. fourchensis, 23 P. serratus, 13 Desmognathus brimleyorum, and 5 P. glutinosus glutinosus) were collected from six localities in three counties in Arkansas (Polk, Scott, and Montgomery) and examined for symbionts. With the exception of Hannemania dunni, all symbionts recovered from the first five species listed constitute new host records, and the endoparasitic fauna in all species establish new locality records. Examinations revealed one or more species of parasites in 82% of the hosts. Eight species of symbionts (3 nematode, 1 trematode, …
Evaluation Of A Fin Ray Scarring Technique For Individually Marking Fish, Les Torrans, Fran Lowell, Howard Clemens
Evaluation Of A Fin Ray Scarring Technique For Individually Marking Fish, Les Torrans, Fran Lowell, Howard Clemens
Journal of the Arkansas Academy of Science
No abstract provided.
Population Decline Of The Endangered Indiana Bat, Myotis Sodalis, In Arkansas, Michael J. Harvey, V. Rick Mcdaniel
Population Decline Of The Endangered Indiana Bat, Myotis Sodalis, In Arkansas, Michael J. Harvey, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
No abstract provided.
Effect Of Stunting On The Growth Of Blue Tilapia (Tilapia Aurea, Cichlidae), Les Torrans, Fran Lowell
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.