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Articles 6601 - 6630 of 7181
Full-Text Articles in Entire DC Network
Reports Of Albino Birds In Arkansas Since 1968, Earl L. Hanebrink
Reports Of Albino Birds In Arkansas Since 1968, Earl L. Hanebrink
Journal of the Arkansas Academy of Science
No abstract provided.
Incidence Of Giardia In Arkansas Beaver, Gary A. Heidt, Ann H. Nichols, James J. Daly
Incidence Of Giardia In Arkansas Beaver, Gary A. Heidt, Ann H. Nichols, James J. Daly
Journal of the Arkansas Academy of Science
No abstract provided.
Demonstration Of A Heat-Stable Cyclic Gmp Phosphodiesterase In The Medium Of Physarum Flavicomum, Thomas J. Lynch, Mark S. Ross
Demonstration Of A Heat-Stable Cyclic Gmp Phosphodiesterase In The Medium Of Physarum Flavicomum, Thomas J. Lynch, Mark S. Ross
Journal of the Arkansas Academy of Science
No abstract provided.
Observations And New Records Of Ferns Naturalizing In Arkansas, James H. Peck, Lance Peacock, William M. Shepherd
Observations And New Records Of Ferns Naturalizing In Arkansas, James H. Peck, Lance Peacock, William M. Shepherd
Journal of the Arkansas Academy of Science
No abstract provided.
Corticocortical Projections Of A Visually Responsive Area In The Cat Brain, Joseph Mcgrath
Corticocortical Projections Of A Visually Responsive Area In The Cat Brain, Joseph Mcgrath
Journal of the Arkansas Academy of Science
The Clare-Bishop (CB) area bears the name of the investigators who first (1954) demonstrated a cortical area in the cat brain located along the lateral aspect of the middle suprasylvian gyrus which responded electrophysiologically to both optic nerve and striate cortex (area 17) stimulation. More recent studies of CB or the lateral suprasylvian (LS) area have supported its role in visual and/or oculomotor functions. Silver degeneration methods were undertaken to clarify some of the corticocortical connections of this cortical region. The data accumulated provides a morphological basis in support of the CB area's role in visual and/or oculomotor activities
Publication Policies And Suggestions For Authors, Academy Editors
Publication Policies And Suggestions For Authors, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring
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 …
Role Of Centriolar Matrix And Striated Rootlets In Centriolar Pairing And Orientation During Spermatogenesis In Hydractina Echinata, Maurice G. Kleve
Role Of Centriolar Matrix And Striated Rootlets In Centriolar Pairing And Orientation During Spermatogenesis In Hydractina Echinata, Maurice G. Kleve
Journal of the Arkansas Academy of Science
Transmission electron microscopy of the spermatogenic stages of the hydroid, Hydractinia echinata, reveals a series of complex structural and positional changes in the centrioles of spermatocytes and spermatids. The newly generated centriolar pairs of spermatocytes form an unusual four-centriole aggregate that persists until cell division. The distal centrioles of this aggregate are shrouded with a very dense matrix that accumulates after centriolar replication. This matrix facilitates the mechanical attachment between distal centrioles and microtubular nucleating satellites, striated rootlets and pericentriolar processes. The association of these accessory structures occurs sequentially and is repeated in spermatocytes and spermatids. An electron dense plaque, …
Evaluation Of Nitrogen And Phosphorus Enrichment Using In Situ Enclosure Bags With Temporal Indigenous Phytoplankton Populations, Richard L. Meyer, W. Reed Green
Evaluation Of Nitrogen And Phosphorus Enrichment Using In Situ Enclosure Bags With Temporal Indigenous Phytoplankton Populations, Richard L. Meyer, W. Reed Green
Arkansas Water Resources Center Technical Reports
An in situ experimental procedure and protocol was developed to evaluate nitrate and phosphate enrichment using isolated indigenous phytoplankton assemblages during different seasons. Results of the comparison of the parameters-temperature, pH, alkalinity, conductivity, and dissolved oxygen between the open water and enclosed systems indicated that there was no significant influence of the physicochemical factors on the isolated biological processes. Growth responses were measured by turbidity, biomass and chlorophyll-a, the most sensitive being chlorophyll-a. Additions of nitrate and phosphate were added in known concentrations and in different magnitudes of concentration based upon ambient conditions and ratio. During the fall, phosphorus influenced …
Studies Of Effectiveness Of Commercial Home Treatment Systems, William W. Trigg, Raymond D. Couser
Studies Of Effectiveness Of Commercial Home Treatment Systems, William W. Trigg, Raymond D. Couser
Arkansas Water Resources Center Technical Reports
Eleven home water systems were tested representing six different types of filtering systems. Tests were made for Sulfates, Nitrates, Phosphate, Iron and Escherichia coli and Enterobacter aerogenes before and after passing through a home treatment system. All of the systems removed iron adequately but had little effect on the removal of nitrates, phosphates, sulfates or control of pH. Since none of the ground waters was contaminated by coli- forms, nothing was established regarding the effectiveness of bacterial removal by these systems.
Factors Affecting The Removal Of Suspended And Dissolved Solids In High Strength Wastewater From Vegetable Processing, William A. Sistrunk
Factors Affecting The Removal Of Suspended And Dissolved Solids In High Strength Wastewater From Vegetable Processing, William A. Sistrunk
Arkansas Water Resources Center Technical Reports
Fifty or more individual factorial experiments were designed to study the effectiveness of physical-chemical and micro-biological treatments in removal of suspended and dissolved solids in effluent from potatoes, hominy, dry beans and other vegetables. The wastewaters were obtained from local processing plants and treated with 3 to 5 inorganic salts, 13 polymers, and 3 or more pH levels during 12 months. Also, selected strains of yeast and fungi were used to assimilate the effluent. Individual inorganic salts were more effective on a certain vegetable effluent than others. Polymers (anionic and cationic) were more effective in coagulating suspended solids in combination …
Precedings Of Arkansas Lakes Symposium Limnological Studies Of Lake Chicot, Arkansas, Joe F. Nix, Frank R. Schiebe
Precedings Of Arkansas Lakes Symposium Limnological Studies Of Lake Chicot, Arkansas, Joe F. Nix, Frank R. Schiebe
Arkansas Water Resources Center Technical Reports
Lake Chicot is an oxbow lake that was created more than 600 years ago by the meandering of the Mississippi River. It is located in Chicot county in southeastern Arkansas adjacent to the present Mississippi River. As the largest natural lake in Arkansas it earned an early reputation for its good fishing and recreational value. Development of a levee system forced the enlargement of the lakes watershed to its present 350 square miles. Initially this alteration affected only the volume flow through the lake, drastically reducing the water residence time. Because the watershed was located in one of the most …
Toward A Concise Definition And Perspective For Biology, Arthur V. Brown, Kristine Basinger Brown
Toward A Concise Definition And Perspective For Biology, Arthur V. Brown, Kristine Basinger Brown
Journal of the Arkansas Academy of Science
The content of introductory biology courses at the high school and college levels are currently being re-examined. Many biological educators favor revision of the high school biology courses to a format that directly addresses current social issues to "promote good citizenship". We believe it would be more meaningful to teach the fundamental principles of biology, the study of living systems. Properly defining biology, by defining a living system, should help identify important topics to include in a basic biology course. Emphasis should be placed on subjects which would contribute most to the development of a basic understanding of how all …
Effects Of Commercial Fish Removal On Sport Fish Populations In Two Arkansas Reservoirs, Tommie Crawford
Effects Of Commercial Fish Removal On Sport Fish Populations In Two Arkansas Reservoirs, Tommie Crawford
Journal of the Arkansas Academy of Science
Commercial netting occurred October through April, 1971-1976 on Nimrod Lake and from October through April, 1973-1977 on Blue Mountain Lake in west central Arkansas. Using 7.6 cm or larger mesh gill and/or trammel nets, commercial fishermen harvested commercial fishes (buffalofishes [Ictiobus spp.]; common carp [Cyprinus carpio], carpsuckers [Carpiodes spp.]; drum [Aplodinotus grunniens]; gars [Lepisosteus spp.]; suckers [Catostomidae); and catfishes [Ictalurus spp. and Pylodictis olivaris]). During the study period, cove rotenone samples were conducted on an annual basis. Fishes collected were placed into age classes and enumerated. Data were then grouped into general categories (black basses [Micropterus spp], crappie [Pomoxis spp.], …
Gas Chromortographic Analyses Of Biocrude-Producing Trees, Roy Z. Gehring, Bob D. Johnson
Gas Chromortographic Analyses Of Biocrude-Producing Trees, Roy Z. Gehring, Bob D. Johnson
Journal of the Arkansas Academy of Science
Gas chromotographic procedures were used to compare commercial diesel fuel with cyclohexane, ether, and methanol extracts from various tree species. Standard n-paraffin hydrocarbons ranging from C-10 thru C-34 were used as standards. These analyses indicated that several extracts, notably those from Juniper virginiana (juniper) and Pinus echinata (pine) trees of Northeast Arkansas and the Brazilian tree Copaifera langsdorffii (copaiba), contain numerous hydrocarbon and selected chemical products which serve as potential renewable biocrude sources.
Ultraviolet Light Reactivation Of Gamma-Ray Induces Chromosome Aberrations In G1 Phase Xenopus Cells, Susan Kulp, Linda Rogers, H. Gaston Griggs
Ultraviolet Light Reactivation Of Gamma-Ray Induces Chromosome Aberrations In G1 Phase Xenopus Cells, Susan Kulp, Linda Rogers, H. Gaston Griggs
Journal of the Arkansas Academy of Science
No abstract provided.
Summary Account Of The Carolina Parakeet In Arkansas, Daniel Mckinley, Douglas A. James
Summary Account Of The Carolina Parakeet In Arkansas, Daniel Mckinley, Douglas A. James
Journal of the Arkansas Academy of Science
The extinct Carolina Parakeet (Conuropsis carolinensis) once was part of the Arkansas avifauna. The first two reports of the species in what is now Arkansas were made in 1673 and 1718 by early French explorers. The remaining records are from the 1800s when parakeets were found in nearly all parts of the state, often in abundance. The last literature reference for the species still definitely occurring in Arkansas pertains to birds present in the summer of 1885 along the White River at Newport
Microgeographic Variation In The Mexican Vole, Microtus Mexicanus, Meredith J. Hamilton, Gary A. Heidt
Microgeographic Variation In The Mexican Vole, Microtus Mexicanus, Meredith J. Hamilton, Gary A. Heidt
Journal of the Arkansas Academy of Science
Altitudinal variation was assessed in 115 (62 male; 53 female) Mexican voles (Microtus mexicanus) from six localities in Jalisco, Mexico. Univariate and multivariate statistical techniques were employed in the data analyses. A total of 49 skeletal measurements were investigated, and of these, 17 showed significant interlocality variation. Rostral breadth, depth of braincase, rostral height, width of third molar and nasal length were found to be the most variable characters. Component I (a size factor) accounted for 36% of the total phenetic variation; components II and III accounted for 30% and 19%, respectively. Larger individuals were found to occur at lower …
Proceedings Of The Arkansas Academy Of Science - Volume 38 1984, Academy Editors
Proceedings Of The Arkansas Academy Of Science - Volume 38 1984, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
River Otter In Arkansas Iii. Characteristics Of Otter Latrines And Their Distribution Along Beaver-Inhabited Watercourses In Southwest Arkansas, Mark R. Karnes, C. Renn Tumlison
River Otter In Arkansas Iii. Characteristics Of Otter Latrines And Their Distribution Along Beaver-Inhabited Watercourses In Southwest Arkansas, Mark R. Karnes, C. Renn Tumlison
Journal of the Arkansas Academy of Science
Forty-one river otter (Lutra canadensis) fecal deposit (latrine) sites were located during April 1983 through March 1984 along beaver (Castor canadensis) inhabited watercourses in Clark, Nevada, and Ouachita counties, Arkansas. Latrine sizes ranged from 64 cm² to 5.01 m² (x-bar=0.30 m²; S.D. =0.88), and contained 2 to 78 scats per latrine (x-bar=9.2; S.D. = 13.8). The most common sites for latrines included elevated leaf or moss covered banks (51.2%), beaver lodges or bank dens (17.1 %), and beaver scent mounds (12.2%). Other latrine sites included felled logs over open water, bare soil along elevated banks, and exposed sandbars. Otter presence …
Some Studies On Introducing Castilleja Coccinea, Indian Paintbrush, Into Prairie Vegetation, Robert D. Wright
Some Studies On Introducing Castilleja Coccinea, Indian Paintbrush, Into Prairie Vegetation, Robert D. Wright
Journal of the Arkansas Academy of Science
Indian paintbrush, absent from many prairie remnants in Arkansas, behaves as a biennial in certain central Arkansas prairies, growing as a small rosette one season and flowering the next. It is known to be an indiscriminate root parasite. Field sowings were made in October, March and June. Annual change in population size was monitored for one of these sowings. Laboratory studies of germination were conducted to investigate the effects of light, temperature, water potential, and host species. Haustorial connections to host roots were examined. Based on these studies, a strategy for establishing the species in prairie was developed.
Water Crisis--An Approach For Teachers Of Grades 7-12, George L. Harp
Water Crisis--An Approach For Teachers Of Grades 7-12, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Temperature Preference And Tolerance Of Grass Carp (Ctenopharyngodon Idella), Marvin L. Galloway, Raj V. Kilambi
Temperature Preference And Tolerance Of Grass Carp (Ctenopharyngodon Idella), Marvin L. Galloway, Raj V. Kilambi
Journal of the Arkansas Academy of Science
Grass carp, acclimated at 24 °C, were tested for temperature preference in a laboratory, horizontal gradient tank. After a 6-day period of exploration the grass carp gravitated to a final thermal preferendum of 35 °C. In the temperature tolerance test the ultimate upper incipient lethal temperature (TL50), was estimated as 41.5°C. The results are compared to those of a similar study with hybrid carp (female grass carp x male bighead carp).
Postnatal Osteology Of The Northern Grasshopper Mouse, Onychomys Leucogaster, Joe W. Bailey, Gary A. Heidt
Postnatal Osteology Of The Northern Grasshopper Mouse, Onychomys Leucogaster, Joe W. Bailey, Gary A. Heidt
Journal of the Arkansas Academy of Science
Two hundred forty-two specimens of Onychomys leucogaster, ranging in age from day of birth to the twenty-eighth day were cleared and stained using both Alizarin KOH and Alcian Blue/Alizarin-Trypsin staining methods. Thirty centers of ossification were studied. The data demonstrate the following: 1) skeletal centers of the appendicular skeleton ossify and mature earliest; 2) a new sesamoid bone lateral to the distal condyles of the femur was discovered; 3) the skeletal ossification of the baculum is present at one day of age; 4) a high degree of individual variation precludes aging of this species by skeletal maturation.
68th Annual Meeting, 1984. Program, Academy Editors
68th Annual Meeting, 1984. Program, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Effect Of Edwardsiella Ictaluri Infection On Plasma Corticosterone Levels In Channel Catfish (Ictalurus Punctatus), Janice L. Cooper, Stanley N. David, John K. Beadles
Effect Of Edwardsiella Ictaluri Infection On Plasma Corticosterone Levels In Channel Catfish (Ictalurus Punctatus), Janice L. Cooper, Stanley N. David, John K. Beadles
Journal of the Arkansas Academy of Science
Channel catfish (Ictalurus punctatus) were innoculated with a new host specific bacterium, Edwardsiella ictaluri, to observe the influence of bacterial infection on plasma corticosterone levels at various temperatures. The fish were innoculated intraperitoneally. The infected fish were separated from the controls. Plasma corticosterone concentrations were determined by radioimmunoassay. The plasma corticosterone concentrations in non-innoculated catfish were about 6.15 ng/ml and nearly 5.63 ng/ml in the infected fish. The lower level of the hormone in the infected catfish was not significantly different from the control level. High temperature was a stress factor which increased plasma corticosterone levels whereas E. ictaluri retarded …
Helminths Of Common Grackles (Quiscalus Quiscula-Versicolor, Viellot) In Central Arkansas, Arthur A. Johnson
Helminths Of Common Grackles (Quiscalus Quiscula-Versicolor, Viellot) In Central Arkansas, Arthur A. Johnson
Journal of the Arkansas Academy of Science
No abstract provided.
Analysis Of Gray Fox (Urocyon Cinereoargenteus) Fur Harvests In Arkansas, Gary A. Heidt, James H. Peck, Lew Johnston
Analysis Of Gray Fox (Urocyon Cinereoargenteus) Fur Harvests In Arkansas, Gary A. Heidt, James H. Peck, Lew Johnston
Journal of the Arkansas Academy of Science
An investigation was conducted on gray fox (Urocyon cinereoargenteus) fur harvest in Arkansas. Data were gathered from a mail survey of Arkansas trappers and from Arkansas Game and Fish Commission fur harvest records from 1939 to 1983. Analyses of these data demonstrated: 1) gray fox were abundant statewide with lower levels in the Delta region; 2) there was a need for fox trappers to keep better records on their trapping efforts, success and composition of catch, including sex and age data; 3) market price: harvest correlation was high (r = 0.956, p < .001); 4) over the past 10 years, the Ozark Mountain region provided the greatest contribution to annual fox harvests, the Ouachita Mountain and Gulf Coastal Plain regions were similar to each other, but lower than the Ozarks, and the Delta region contributed the least, but with a generally stable harvest.
Extracellular Phosphodiesterase From The Growth Medium Of The Myxomycete Physarum Flavicomum, Thomas J. Lynch, Mary E. Farrell
Extracellular Phosphodiesterase From The Growth Medium Of The Myxomycete Physarum Flavicomum, Thomas J. Lynch, Mary E. Farrell
Journal of the Arkansas Academy of Science
The plasmodium of the myxomycete Physarum flavicomum secretes cyclic AMP phosphodiesterase into the medium. The extracellular enzyme had a pH optimum between 7 and 8 and a Km of about 500 μM cyclic AMP and was inhibited by theophylline, caffeine and 3-isobutyl-l-methyxanthine (MIX). A marked decrease of enzyme activity was noted in the presence of EDTA, suggesting the requirement of Mg+ + by the enzyme. Addition of Mg+ + and Ca + + stimulated the enzyme while Zn+ + , Co+ + , Pb+ + , Mn+ + , Fe + + + , Ni+ + , and Cu + …
Distribution And Efficiency Of Hydrocarbon-Oxidizing Bacteria In A Freshwater Reservoir, Carol H. Smedley, Jimmy D. Bragg, Aubrey B. Gosnell
Distribution And Efficiency Of Hydrocarbon-Oxidizing Bacteria In A Freshwater Reservoir, Carol H. Smedley, Jimmy D. Bragg, Aubrey B. Gosnell
Journal of the Arkansas Academy of Science
Hydrocarbon-oxidizing bacteria were identified from three stations on DeGray Reservoir, Arkansas. The organisms were primarily gram-negative rods representing 9 taxa and 37 biotypes Pseudomonas spp. were the most common isolates. The largest populations were found in areas most frequently used by boaters, although seasonal fluctuations were apparent during the spring and fall. The degradation of outboard motor oil by the five most rapidly growing isolates was studied. Each species had a different decomposition profile, and substrate oxidation rates were variable Acinetobacter calcoaceticus var. anitratus was the most efficient decomposer.