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Articles 6481 - 6510 of 7181
Full-Text Articles in Entire DC Network
Table Of Contents, Academy Editors
Table Of Contents, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
In Memoriam: Delzie Damaree, Gary E. Tucker
In Memoriam: Delzie Damaree, Gary E. Tucker
Journal of the Arkansas Academy of Science
No abstract provided.
72nd Annual Meeting, 1988. Secretary's Report And Financial Statement, Academy Editors
72nd Annual Meeting, 1988. Secretary's Report And Financial Statement, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Response Of Fish Communities To Habitat Alteration In A Small Ozark Stream, Danny J. Ebert, Stephen P. Filipek
Response Of Fish Communities To Habitat Alteration In A Small Ozark Stream, Danny J. Ebert, Stephen P. Filipek
Journal of the Arkansas Academy of Science
From 1984 to 1986, the Arkansas Highway and Transportation Department reconstructed and upgraded a portion of St. Hwy. 123 west of St. Hwy.7 at Pelsor, Arkansas. As a result of the construction, portions of Haw Creek, Johnson County, Arkansas, a third order stream in the Boston Mountains Ecoregion, were straightened and channelized. In reconstructing specific stream reaches, stream banks were riprapped and vegetated, gabions constructed and positioned, stream substrates and pool-riffle ratios altered. Instream and riparian habitat and fish biomass and diversity in altered reaches were radically altered. Channelized reaches became wide and shallow, lacking overstory cover and pools. Substrate …
Forestry On The Island Of Taiwan, Roc - The State Of The Art, James M. Guldin, Timothy T. Ku, R. Scott Beasley
Forestry On The Island Of Taiwan, Roc - The State Of The Art, James M. Guldin, Timothy T. Ku, R. Scott Beasley
Journal of the Arkansas Academy of Science
The forests of Taiwan vary from lush subtropical vegetation to subalpine coniferous associations. Topography is exceedingly rugged, and stands border on the verge of silvicultural inoperability. In the 1950s and 1960s, the wood products industry in the Republic of China was of paramount importance; the production of high-quality sawtimber from old-growth cypress (Cupressaceae) stands provided the financial capital that built one of the most prosperous national economies in the modern world. In the 1980s, forestry in Taiwan is a curious blend of old methods and new technologies, as modern silvicultural practices are used to reforest cutover cypress stands, to harvest …
Comparison Of Cyclic Nucloetide Phosphodiesterase In Physarum Favicomum, C. Kay Holtman, Tammy K. Ebsen, Judith A. Bean, J. Scott Bryles, Thomas J. Lynch
Comparison Of Cyclic Nucloetide Phosphodiesterase In Physarum Favicomum, C. Kay Holtman, Tammy K. Ebsen, Judith A. Bean, J. Scott Bryles, Thomas J. Lynch
Journal of the Arkansas Academy of Science
We have studied both cyclic AMP phosphodiesterase and cyclic GMP phosphodiesterase in the myxomycete Physarum flavicomum. The cyclic AMP phosphodiesterase preparations were isolated from both the diploid plasmodial stage of the lifecycle and the haploid myxamoebal stage. The plasmodial enzyme was prepared from spent medium (extracellular) and also from purified nuclei. The myxamoebal enzyme was prepared from purified nuclei. Cyclic GMP phosphodiesterase activity was studied in purified nuclei isolated from the plasmodium. One unusual feature of all the enzymes from the plasmodium is extreme heat stability; they remain catalytically active even after exposure to a boiling water bath for twenty …
Mandibular Dentition In Six Species Of Salamanders, Genus Plethodon (Caudata: Plethontidae), From Arkansas Using Scanning Electron Microscopy, Richard A. Atwill, Stanley E. Trauth
Mandibular Dentition In Six Species Of Salamanders, Genus Plethodon (Caudata: Plethontidae), From Arkansas Using Scanning Electron Microscopy, Richard A. Atwill, Stanley E. Trauth
Journal of the Arkansas Academy of Science
The mandibular (dentary) dentition of six species of Plethodon (P. caddoensis, P. dorsalis, P. fourchensis, P. glutinosus, P. ouachitae, and P. serratus) from Arkansas was studied using scanning electron microscopy. In all species, the mandibular teeth were bicuspid, and each tooth possessed a prominent labial cusp and a well-developed, inward-curving lingual cusp. All species showed similar tooth crown features, except P. caddoensis which exhibited a reduced tooth height and a reduced lingual cusp (only slightly larger than the labial cusp). We compared our data with other studies on premaxillary, maxillary, and palatal teeth in Plethodon and found overall similarities in …
Autumn Foods Of White-Tailed Deer In Arkansas, Thomas A. Nelson, Luke Eggering, Danny Adams
Autumn Foods Of White-Tailed Deer In Arkansas, Thomas A. Nelson, Luke Eggering, Danny Adams
Journal of the Arkansas Academy of Science
Rumen contents from 65 hunter-harvested deer were collected and analyzed during 1985-86 to estimate the principal autumn foods consumed by white-tailed deer inhabiting the Ozark Mountains, Arkansas River Valley, and Gulf Coastal Plain regions of Arkansas. Deer in the Ozarks and Coastal Plain fed heavily on woody browse species, which comprised 99% of rumina identified from these 2 regions. Acorns were the primary food of deer in these heavily forested areas. Acorns and other woody browse were less important to deer inhabiting the Arkansas River Valley. In this region of interspersed agricultural fields and bottomland forests, soybeans and corn comprised …
Distribution And Status Of The Brazilian Free-Tailed Bat (Tadarida Brasiliensis Cynocephala) In Arkansas, David A. Saugey, Gary A. Heidt, Darrell R. Heath, Tim W. Steward, Daniel R. England, V. Rick Mcdaniel
Distribution And Status Of The Brazilian Free-Tailed Bat (Tadarida Brasiliensis Cynocephala) In Arkansas, David A. Saugey, Gary A. Heidt, Darrell R. Heath, Tim W. Steward, Daniel R. England, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
Investigations of building infestations, mist netting activities, and specimens submitted to the Arkansas Department of Health document the Brazilian free-tailed bat to be found in 14 Arkansas counties. Both overwintering and maternity colonies were examined. Numbers of individuals ranged from one to several thousand.
Toe Tip Morphology In Six Species Of Salamanders, Genus Ambystoma (Caudata: Ambystomatidae) From Arkansas Using Scanning Electron Microscopy, Stanley E. Trauth, J. D. Wilhide
Toe Tip Morphology In Six Species Of Salamanders, Genus Ambystoma (Caudata: Ambystomatidae) From Arkansas Using Scanning Electron Microscopy, Stanley E. Trauth, J. D. Wilhide
Journal of the Arkansas Academy of Science
The toe tip friction surface in six species of Ambystoma (A. annulatum, A.maculatum, A.opacum, A. talpoideum, A. texanum, and A. tigrinum) from Arkansas was examined using scanning electron microscopy. We found no sexual dimorphism in cell surface ultrastructure. Variation within and between species was considerable. The most active burrower, A. tigrinum, possessed the most disorganized cell surface, whereas the least active burrowers (A.annulatum, A.maculatum, and A. opacum) had morphologically similar and relatively smooth toe tips. In A. talpoideum and A. texanum, cell surfaces exhibited microprojections. Only these two species possessed mucous pores in close proximity to the friction surface. The …
Sex Ratios In Bobcat Populations, C. Renn Tumlison, V. Rick Mcdaniel
Sex Ratios In Bobcat Populations, C. Renn Tumlison, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
Reported sex ratios in bobcat populations have suggested great variation ranging from strong male bias to strong female bias. Explanations offered for these observations have included factors of mobility, activity, behavior, inaccurate data collection, hunting pressure, and population density. Ratios are probably most representative during the winter, when females are no longer under constraints of parental care. Sex determination should be made by experienced observers and preferably through internal examination. The most productive direction for interpretation of validated ratios appears to be in terms of population density, hunting pressure, and the timing of harvest.
Factors Affecting Annual Deer Harvest In Arkansas, Richard A. Kluender, T. Bentley Wigley Jr., Michael E. Cartwright
Factors Affecting Annual Deer Harvest In Arkansas, Richard A. Kluender, T. Bentley Wigley Jr., Michael E. Cartwright
Journal of the Arkansas Academy of Science
An understanding of general forces affecting annual harvest is essential to the management of white-tailed deer (Odocoileus virginianus). A predictive model based on such factors would be valuable to managers. The relationship between 27 different variables and annual, legal deer harvest in Arkansas was evaluated for 1957-1986. Variables most affecting harvest were soybean acreage, hay acreage, number of days in the deer season, rain during the deer season, and total state timber production, total state pulpwood production, and deer harvest 2 years prior. Because significant autocorrelation and heteroscedasticity were present in the variables, log-linear, first differencing and non-linear quasi-Newton regression …
Distribution, Abundance, Status, And Phytogeography Of Log Ferns (Dryopteris: Woodsiaceae) In Arkansas, James H. Peck, Carol J. Peck
Distribution, Abundance, Status, And Phytogeography Of Log Ferns (Dryopteris: Woodsiaceae) In Arkansas, James H. Peck, Carol J. Peck
Journal of the Arkansas Academy of Science
A study of the distribution, abundance, status, and phytogeography of the six taxa of Log Ferns {Dryopteris: Woodsiaceae) that are known to occur in Arkansas was conducted from 1981 -1986. Five of these ferns are generally quite rare in Arkansas. Except for D. marginalis, all exist in Arkansas as small, peripheral populations that are marginal, outlier populations to the west and south or west and north of their metropolis. Two sterile, triploid hybrid taxa (D. X australls and D. X leedsii each occur at only one locality, and there with but one of their parent taxa. The population of the …
Bats Of Hot Springs National Park, Arkansas, David A. Saugey, Dianne G. Saugey, Gary A. Heidt, Darrell R. Heath
Bats Of Hot Springs National Park, Arkansas, David A. Saugey, Dianne G. Saugey, Gary A. Heidt, Darrell R. Heath
Journal of the Arkansas Academy of Science
A survey was conducted from June 1982 through January 1987 to determine the occurrence of bat species in Hot Springs National Park, Garland County, Arkansas; an area of approximately 2025 hectares. A total of 309 bats in the families Molossidae and Vespertilionidae were captured. Species represented included: Eptesicus fuscus, Lasiurus borealis, Lasiurus cinereus, Nycticeius humeralis, Pipistrellus subflavus, and Tadarida brasiliensis cynocephala.
Eggtooth Development And Morphology In The Six-Lined Racerunner Cnemidophorus Sexlineatus (Sauria: Teiidiae) Using Scanning Electron Microscopy, Stanley E. Trauth
Eggtooth Development And Morphology In The Six-Lined Racerunner Cnemidophorus Sexlineatus (Sauria: Teiidiae) Using Scanning Electron Microscopy, Stanley E. Trauth
Journal of the Arkansas Academy of Science
Eggtooth development and morphology in the six-lined racerunner, Cnemidophorus sexlineatus, were examined using scanning electron microscopy. The anlage of the embryonic eggtooth emerges from the anterior surface of the palate relatively late during embryonic development. The eggtooth proper erupts through an epithelial sheath and grows anteriorly to project beyond the rostral scale. The mature eggtooth is hollow, has a wall made of enamel and dentine, possesses a sharply-curved body and has a flattened, pointed tip. The eggtooth is shed within several days after the young hatch.
Survival And Growth Two Years After Control Of Herbaceous Competitors In Newly Planted Seedlings Of Loblolly Pine, Jimmie L. Yeiser, J. W. Boyd
Survival And Growth Two Years After Control Of Herbaceous Competitors In Newly Planted Seedlings Of Loblolly Pine, Jimmie L. Yeiser, J. W. Boyd
Journal of the Arkansas Academy of Science
Early or late over-the-top applications of herbicides were used to control herbaceous competition in machine planted loblolly pine (Pinus taeda L) seedlings at two locations in a pasture near Alleene and hand planted seedlings on a bedded site near Fouke. Sites were selected for diverse competitors. None of the treatments controlled weeds for the entire growing season. Only glyphosate + sulfometuron methyl produced seedling survival and growth below the check plots. The best over-the-top treatments were sulfometuron methyl alone or sulfometuron methyl + hexazinone.
Forest Habitat Use By White-Tailed Deer In The Arkansas Coastal Plain, T. B. Wigley Jr., M. E. Garner
Forest Habitat Use By White-Tailed Deer In The Arkansas Coastal Plain, T. B. Wigley Jr., M. E. Garner
Journal of the Arkansas Academy of Science
Forest habitat use by five radio-equipped white-tailed deer (Odocoileus virginianus) was monitored in the Arkansas Coastal Plain during 1982-84. The deer were located 821 times. Use of forest types was compared to expected use as calculated from availability. The study area was also divided into 491 two-hectare cells for which timber characteristics and number of deer locations were determined. Pine sawtimber was the most heavily used forest type in all seasons and was used more often than expected during spring. Also used more than expected were brushy areas (clearcut but not site prepared) during spring, summer and fall and openings …
Equations Of Variation For Ordinary Differential Equations On Manifolds, J. B. Bennett
Equations Of Variation For Ordinary Differential Equations On Manifolds, J. B. Bennett
Journal of the Arkansas Academy of Science
No abstract provided.
Reproductive Characteristics Of South Florida Sternotherus Odoratus And Kinosternon Baurii (Testudines: Kinosternidae), Walter E. Meshaka Jr.
Reproductive Characteristics Of South Florida Sternotherus Odoratus And Kinosternon Baurii (Testudines: Kinosternidae), Walter E. Meshaka Jr.
Journal of the Arkansas Academy of Science
No abstract provided.
Notes On The Biology Of Thyanta Claceala (Hemiptera: Pentatomidae) On Tephrosia Virginiana (Leguminosae), A New Host Plant, Phoebe A. Harp, Harvey E. Barton
Notes On The Biology Of Thyanta Claceala (Hemiptera: Pentatomidae) On Tephrosia Virginiana (Leguminosae), A New Host Plant, Phoebe A. Harp, Harvey E. Barton
Journal of the Arkansas Academy of Science
No abstract provided.
Mammalian Species Recovered From A Study Of Barn Owl, Tyto Alba, Pellets From Southwestern Arkansas, Tim W. Steward, J. D. Wilhide, V. Rick Mcdaniel, Daniel R. England
Mammalian Species Recovered From A Study Of Barn Owl, Tyto Alba, Pellets From Southwestern Arkansas, Tim W. Steward, J. D. Wilhide, V. Rick Mcdaniel, Daniel R. England
Journal of the Arkansas Academy of Science
No abstract provided.
Movement And Transformation Of Selected Organic Pollutants In Subsurface Environmet In Arkansas, Ali U. Shaikh
Movement And Transformation Of Selected Organic Pollutants In Subsurface Environmet In Arkansas, Ali U. Shaikh
Arkansas Water Resources Center Technical Reports
Several subsurface soil and groundwater samples from eastern, southern and central Arkansas were analyzed for chlorinated organic compounds commonly used as pesticides and industrial chemicals. No significant amount of these compounds were found in these samples. The adsorption/partition characteristics of some of these compounds, such as dichlorophenols, aldrin and endrin, were determined in siltloam, sandyloam and clay soils collected from the above geographical locations. Results indicate that there is considerable difference in retention capability of different types of soils with respect to different pollutants. The partition coefficient of a particular compound in a certain type of soil can be related …
Assessment Of The Effects Of Household Chemicals Upon Individual Septic Tank Performances, Mark A. Gross
Assessment Of The Effects Of Household Chemicals Upon Individual Septic Tank Performances, Mark A. Gross
Arkansas Water Resources Center Technical Reports
A laboratory study and a field study were performed to determine the amounts of specific household chemicals required to destroy bacteria populations in individual domestic septic tanks. The particular chemicals evaluated include liquid chlorine bleach, High Test Hypochlorite (HTH), Lysol disinfectant and Drano crystal. The laboratory study was performed to determine the approximate chemical concentrations to destroy the bacteria in the septic tank, and the field study showed the actual effect of the chemicals upon the bacteria in terms of reduction of the number of bacteria in the septic tank as well as the time required for the bacterial population …
Qualitative And Quantitative Aquatic Algal Data Compilation To Determine Macrotrends- Iii, Richard L. Meyer
Qualitative And Quantitative Aquatic Algal Data Compilation To Determine Macrotrends- Iii, Richard L. Meyer
Arkansas Water Resources Center Technical Reports
A data base of the algae of Arkansas ecoregions has been established by the use of a relational data base management system (dBase III plus). The system was chosen to be readily available for a variety of microcomputers using MS- and PC-DOS. The data base contains taxonomic fields from division through variety, synonymy, authors, initial description, date and definitive descriptive source. The data are cross-referenced by ecoregion, Round's community and subcommunity designations. The data base contains approximately 1,500 taxonomic records in all divisions and classes of freshwater algae. The data are sortable by any of the included parameters. The data …
71st Annual Meeting, 1987. Secretary's Report And Financial Statement, Academy Editors
71st Annual Meeting, 1987. Secretary's Report And Financial Statement, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Residual Pesticides In Fishes From Lake Chicot, Arkansas, C. M. Cooper, S. S. Knight
Residual Pesticides In Fishes From Lake Chicot, Arkansas, C. M. Cooper, S. S. Knight
Journal of the Arkansas Academy of Science
Samples of fish from isolated and flow-through portions of Lake Chicot, Arkansas, were analyzed for residual pesticide concentrations from 1978 and 1981. Where appropriate ecologically, fish flesh, viscera and whole fish, were analyzed for the common organochlorine insecticides DDT [1,1 ,1-trichloro -2,2bis(p-chlorophenyl)-ethane], DDE [1,1-dichloro-2,2-bis(p-chlorophenyl)-ethyene], DDD [1,1-dichloro -2,2-bis(p-chlorophenyl)-ethane], toxaphene (chlorinated camphene), chlordane, heptachlor, heptachlor epoxide, dieldrin, and endrin. DDT, DDT metabolites, and heptachlor were significantly (a = 0.05) higher in spotted gar (Lepisosteus oculatus) and yellow bullhead catfish (Ictalurus natalis) than in other species examined. Pesticide concentrations did not exceed the acceptable levels established by the U.S. Environmental Protection Agency although …
Photoreactivation Of Lethal Damage Induced In Hamster X Xenopus Hybrid Cells And Their Parentals By Uv Light, David Bohlender, Stuart Williams, Emir Cruz, H. Gaston Griggs
Photoreactivation Of Lethal Damage Induced In Hamster X Xenopus Hybrid Cells And Their Parentals By Uv Light, David Bohlender, Stuart Williams, Emir Cruz, H. Gaston Griggs
Journal of the Arkansas Academy of Science
A85 Xenopus cells that exhibited a high level of photoreactivation (PR) and V79B2 hamster cells that exhibited little PR were fused to produce the V79B2 x A85 cell line — a hybrid line which possessed a relatively stable karyotype, with most cells containing the entire V79B2 and A85 genomes. UV and UV plus PR fluence-survival relations were then determined and compared for the hybrid and parental lines in a first attempt to elucidate interactions of the parental PR mechanisms in the hybrid. It was anticipated that the A85 genome in the hybrid would produce PR enzyme in sufficient concentration and …
Selected Families Of Trichoptera In Arkansas, Veryl V. Board
Selected Families Of Trichoptera In Arkansas, Veryl V. Board
Journal of the Arkansas Academy of Science
No abstract provided.
Genetic Family And Stock Type Influence Simulated Loblolly Pine Yields From Wet Sites, J. F. Dickson, Jimmie L. Yeiser, Richard A. Kleunder, J. L. Paschke
Genetic Family And Stock Type Influence Simulated Loblolly Pine Yields From Wet Sites, J. F. Dickson, Jimmie L. Yeiser, Richard A. Kleunder, J. L. Paschke
Journal of the Arkansas Academy of Science
Planting adapted families or a bulked seedlot of bare-root and container-grown-seedlings of loblolly pine (Pinus taeda L) were contrasted as cost effective alternatives for regenerating Arkansas' wet sites. Survival data from two wet sites were used to simulate 15 years of growth. Containerized seedlings provided 17% greater survival than bare-root seedlings, but yielded a lower present net worth than bare-root seedlings. Planting families adapted to excessive moisture provided 7% greater survival and yielded a greater present net worth than planting a bulked seedlot consisting of adapted and poorly adapted families.
Woody Plants Of South Arkansas: Computer Aided Instruction In Dendrology, J. F. Dickson, Jimmie L. Yeiser
Woody Plants Of South Arkansas: Computer Aided Instruction In Dendrology, J. F. Dickson, Jimmie L. Yeiser
Journal of the Arkansas Academy of Science
No abstract provided.